/* Generate code from machine description to compute values of attributes. Copyright (C) 1991 Free Software Foundation, Inc. Contributed by Richard Kenner (kenner@nyu.edu) This file is part of GNU CC. GNU CC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU CC; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ /* This program handles insn attributes and the DEFINE_DELAY and DEFINE_FUNCTION_UNIT definitions. It produces a series of functions named `get_attr_...', one for each insn attribute. Each of these is given the rtx for an insn and returns a member of the enum for the attribute. These subroutines have the form of a `switch' on the INSN_CODE (via `recog_memoized'). Each case either returns a constant attribute value or a value that depends on tests on other attributes, the form of operands, or some random C expression (encoded with a SYMBOL_REF expression). If the attribute `alternative', or a random C expression is present, `constrain_operands' is called. If either of these cases of a reference to an operand is found, `insn_extract' is called. The special attribute `length' is also recognized. For this operand, expressions involving the address of an operand or the current insn, (address (pc)), are valid. In this case, an initial pass is made to set all lengths that do not depend on address. Those that do are set to the maximum length. Then each insn that depends on an address is checked and possibly has its length changed. The process repeats until no further changed are made. The resulting lengths are saved for use by `get_attr_length'. A special form of DEFINE_ATTR, where the expression for default value is a CONST expression, indicates an attribute that is constant for a given run of the compiler. The subroutine generated for these attributes has no parameters as it does not depend on any particular insn. Constant attributes are typically used to specify which variety of processor is used. Internal attributes are defined to handle DEFINE_DELAY and DEFINE_FUNCTION_UNIT. Special routines are output for these cases. This program works by keeping a list of possible values for each attribute. These include the basic attribute choices, default values for attribute, and all derived quantities. As the description file is read, the definition for each insn is saved in a `struct insn_def'. When the file reading is complete, a `struct insn_ent' is created for each insn and chained to the corresponding attribute value, either that specified, or the default. An optimization phase is then run. This simplifies expressions for each insn. EQ_ATTR tests are resolved, whenever possible, to a test that indicates when the attribute has the specified value for the insn. This avoids recursive calls during compilation. The strategy used when processing DEFINE_DELAY and DEFINE_FUNCTION_UNIT definitions is to create arbitrarily complex expressions and have the optimization simplify them. Once optimization is complete, any required routines and definitions will be written. An optimization that is not yet implemented is to hoist the constant expressions entirely out of the routines and definitions that are written. A way to do this is to iterate over all possible combinations of values for constant attributes and generate a set of functions for that given combination. An initialization function would be written that evaluates the attributes and installs the corresponding set of routines and definitions (each would be accessed through a pointer). We use the flags in an RTX as follows: `unchanging' (RTX_UNCHANGING_P): This rtx is fully simplified independent of the insn code. `in_struct' (MEM_IN_STRUCT_P): This rtx is fully simplified for the insn code currently being processed (see optimize_attrs). `integrated' (RTX_INTEGRATED_P): This rtx is permanent and unique (see attr_rtx). */ #include #include "gvarargs.h" #include "config.h" #include "rtl.h" #include "obstack.h" #include "insn-config.h" /* For REGISTER_CONSTRAINTS */ static struct obstack obstack, obstack1, obstack2; struct obstack *rtl_obstack = &obstack; struct obstack *hash_obstack = &obstack1; struct obstack *temp_obstack = &obstack2; #define obstack_chunk_alloc xmalloc #define obstack_chunk_free free /* Define this so we can link with print-rtl.o to get debug_rtx function. */ char **insn_name_ptr = 0; extern void free (); extern rtx read_rtx (); static void fatal (); void fancy_abort (); /* Define structures used to record attributes and values. */ /* As each DEFINE_INSN, DEFINE_PEEPHOLE, or DEFINE_ASM_ATTRIBUTES is encountered, we store all the relevant information into a `struct insn_def'. This is done to allow attribute definitions to occur anywhere in the file. */ struct insn_def { int insn_code; /* Instruction number. */ int insn_index; /* Expression numer in file, for errors. */ struct insn_def *next; /* Next insn in chain. */ rtx def; /* The DEFINE_... */ int num_alternatives; /* Number of alternatives. */ int vec_idx; /* Index of attribute vector in `def'. */ }; /* Once everything has been read in, we store in each attribute value a list of insn codes that have that value. Here is the structure used for the list. */ struct insn_ent { int insn_code; /* Instruction number. */ int insn_index; /* Index of definition in file */ struct insn_ent *next; /* Next in chain. */ }; /* Each value of an attribute (either constant or computed) is assigned a structure which is used as the listhead of the insns that have that value. */ struct attr_value { rtx value; /* Value of attribute. */ struct attr_value *next; /* Next attribute value in chain. */ struct insn_ent *first_insn; /* First insn with this value. */ int num_insns; /* Number of insns with this value. */ int has_asm_insn; /* True if this value used for `asm' insns */ }; /* Structure for each attribute. */ struct attr_desc { char *name; /* Name of attribute. */ struct attr_desc *next; /* Next attribute. */ int is_numeric; /* Values of this attribute are numeric. */ int is_const; /* Attribute value constant for each run. */ int is_special; /* Don't call `write_attr_set'. */ struct attr_value *first_value; /* First value of this attribute. */ struct attr_value *default_val; /* Default value for this attribute. */ }; #define NULL_ATTR (struct attr_desc *) NULL /* Structure for each DEFINE_DELAY. */ struct delay_desc { rtx def; /* DEFINE_DELAY expression. */ struct delay_desc *next; /* Next DEFINE_DELAY. */ int num; /* Number of DEFINE_DELAY, starting at 1. */ }; /* Record information about each DEFINE_FUNCTION_UNIT. */ struct function_unit_op { rtx condexp; /* Expression TRUE for applicable insn. */ struct function_unit_op *next; /* Next operation for this function unit. */ int num; /* Ordinal for this operation type in unit. */ int ready; /* Cost until data is ready. */ rtx busyexp; /* Expression computing conflict cost. */ }; /* Record information about each function unit mentioned in a DEFINE_FUNCTION_UNIT. */ struct function_unit { char *name; /* Function unit name. */ struct function_unit *next; /* Next function unit. */ int num; /* Ordinal of this unit type. */ int multiplicity; /* Number of units of this type. */ int simultaneity; /* Maximum number of simultaneous insns on this function unit or 0 if unlimited. */ rtx condexp; /* Expression TRUE for insn needing unit. */ rtx costexp; /* Worst-case cost as function of insn. */ int num_opclasses; /* Number of different operation types. */ struct function_unit_op *ops; /* Pointer to first operation type. */ int needs_conflict_function; /* Nonzero if a conflict function required. */ rtx default_cost; /* Conflict cost, if constant. */ }; /* Listheads of above structures. */ /* This one is indexed by the first character of the attribute name. */ #define MAX_ATTRS_INDEX 256 static struct attr_desc *attrs[MAX_ATTRS_INDEX]; static struct insn_def *defs; static struct delay_desc *delays; static struct function_unit *units; /* Other variables. */ static int insn_code_number; static int insn_index_number; static int got_define_asm_attributes; static int must_extract; static int must_constrain; static int address_used; static int num_delays; static int have_annul_true, have_annul_false; static int num_units; /* Used as operand to `operate_exp': */ enum operator {PLUS_OP, MINUS_OP, OR_OP, MAX_OP}; /* Stores, for each insn code, the number of constraint alternatives. */ static int *insn_n_alternatives; /* Stores, for each insn code, a bitmap that has bits on for each possible alternative. */ static int *insn_alternatives; /* If nonzero, assume that the `alternative' attr has this value. This is the hashed, unique string for the numeral whose value is chosen alternative. */ static char *current_alternative_string; /* Used to simplify expressions. */ static rtx true_rtx, false_rtx; /* Used to reduce calls to `strcmp' */ static char *alternative_name; /* Simplify an expression. Only call the routine if there is something to simplify. */ #define SIMPLIFY_TEST_EXP(EXP,INSN_CODE,INSN_INDEX) \ (RTX_UNCHANGING_P (EXP) || MEM_IN_STRUCT_P (EXP) ? (EXP) \ : simplify_test_exp (EXP, INSN_CODE, INSN_INDEX)) /* Simplify (eq_attr ("alternative") ...) when we are working with a particular alternative. */ #define SIMPLIFY_ALTERNATIVE(EXP) \ if (current_alternative_string \ && GET_CODE ((EXP)) == EQ_ATTR \ && XSTR ((EXP), 0) == alternative_name) \ (EXP) = (XSTR ((EXP), 1) == current_alternative_string \ ? true_rtx : false_rtx); /* These are referenced by rtlanal.c and hence need to be defined somewhere. They won't actually be used. */ rtx frame_pointer_rtx, stack_pointer_rtx, arg_pointer_rtx; static rtx attr_rtx (); static char *attr_printf (); static char *attr_string (); static rtx check_attr_test (); static rtx check_attr_value (); static rtx convert_set_attr_alternative (); static rtx convert_set_attr (); static void check_defs (); static rtx convert_const_symbol_ref (); static rtx make_canonical (); static struct attr_value *get_attr_value (); static rtx copy_rtx_unchanging (); static rtx copy_boolean (); static void expand_delays (); static rtx operate_exp (); static void expand_units (); static void fill_attr (); static rtx substitute_address (); static void make_length_attrs (); static rtx identity_fn (); static rtx zero_fn (); static rtx one_fn (); static rtx max_fn (); static rtx simplify_cond (); static rtx simplify_by_alternatives (); static void remove_insn_ent (); static void insert_insn_ent (); static rtx insert_right_side (); static rtx make_alternative_compare (); static int compute_alternative_mask (); static rtx evaluate_eq_attr (); static rtx simplify_and_tree (); static rtx simplify_or_tree (); static rtx simplify_test_exp (); static void optimize_attrs (); static void gen_attr (); static int count_alternatives (); static int compares_alternatives_p (); static int contained_in_p (); static void gen_insn (); static void gen_delay (); static void gen_unit (); static void write_test_expr (); static int max_attr_value (); static void walk_attr_value (); static void write_attr_get (); static rtx eliminate_known_true (); static void write_attr_set (); static void write_attr_case (); static void write_attr_value (); static void write_attr_valueq (); static void write_upcase (); static void write_indent (); static void write_eligible_delay (); static void write_function_unit_info (); static int n_comma_elts (); static char *next_comma_elt (); static struct attr_desc *find_attr (); static void make_internal_attr (); static struct attr_value *find_most_used (); static rtx find_single_value (); static rtx make_numeric_value (); char *xrealloc (); char *xmalloc (); static void fatal (); /* Hash table for sharing RTL and strings. */ /* Each hash table slot is a bucket containing a chain of these structures. Strings are given negative hash codes; RTL expressions are given positive hash codes. */ struct attr_hash { struct attr_hash *next; /* Next structure in the bucket. */ int hashcode; /* Hash code of this rtx or string. */ union { char *str; /* The string (negative hash codes) */ rtx rtl; /* or the RTL recorded here. */ } u; }; /* Now here is the hash table. When recording an RTL, it is added to the slot whose index is the hash code mod the table size. Note that the hash table is used for several kinds of RTL (see attr_rtx) and for strings. While all these live in the same table, they are completely independent, and the hash code is computed differently for each. */ #define RTL_HASH_SIZE 4093 struct attr_hash *attr_hash_table[RTL_HASH_SIZE]; /* Here is how primitive or already-shared RTL's hash codes are made. */ #define RTL_HASH(RTL) ((int) (RTL) & 0777777) /* Add an entry to the hash table for RTL with hash code HASHCODE. */ static void attr_hash_add_rtx (hashcode, rtl) int hashcode; rtx rtl; { register struct attr_hash *h; h = (struct attr_hash *) obstack_alloc (hash_obstack, sizeof (struct attr_hash)); h->hashcode = hashcode; h->u.rtl = rtl; h->next = attr_hash_table[hashcode % RTL_HASH_SIZE]; attr_hash_table[hashcode % RTL_HASH_SIZE] = h; } /* Add an entry to the hash table for STRING with hash code HASHCODE. */ static void attr_hash_add_string (hashcode, str) int hashcode; char *str; { register struct attr_hash *h; h = (struct attr_hash *) obstack_alloc (hash_obstack, sizeof (struct attr_hash)); h->hashcode = -hashcode; h->u.str = str; h->next = attr_hash_table[hashcode % RTL_HASH_SIZE]; attr_hash_table[hashcode % RTL_HASH_SIZE] = h; } /* Generate an RTL expression, but avoid duplicates. Set the RTX_INTEGRATED_P flag for these permanent objects. In some cases we cannot uniquify; then we return an ordinary impermanent rtx with RTX_INTEGRATED_P clear. Args are like gen_rtx, but without the mode: rtx attr_rtx (code, [element1, ..., elementn]) */ /*VARARGS1*/ static rtx attr_rtx (va_alist) va_dcl { va_list p; enum rtx_code code; register int i; /* Array indices... */ register char *fmt; /* Current rtx's format... */ register rtx rt_val; /* RTX to return to caller... */ int hashcode; register struct attr_hash *h; struct obstack *old_obstack = rtl_obstack; va_start (p); code = va_arg (p, enum rtx_code); /* For each of several cases, search the hash table for an existing entry. Use that entry if one is found; otherwise create a new RTL and add it to the table. */ if (GET_RTX_CLASS (code) == '1') { rtx arg0 = va_arg (p, rtx); /* A permanent object cannot point to impermanent ones. */ if (! RTX_INTEGRATED_P (arg0)) { rt_val = rtx_alloc (code); XEXP (rt_val, 0) = arg0; va_end (p); return rt_val; } hashcode = ((int) code + RTL_HASH (arg0)); for (h = attr_hash_table[hashcode % RTL_HASH_SIZE]; h; h = h->next) if (h->hashcode == hashcode && GET_CODE (h->u.rtl) == code && XEXP (h->u.rtl, 0) == arg0) goto found; if (h == 0) { rtl_obstack = hash_obstack; rt_val = rtx_alloc (code); XEXP (rt_val, 0) = arg0; } } else if (GET_RTX_CLASS (code) == 'c' || GET_RTX_CLASS (code) == '2' || GET_RTX_CLASS (code) == '<') { rtx arg0 = va_arg (p, rtx); rtx arg1 = va_arg (p, rtx); /* A permanent object cannot point to impermanent ones. */ if (! RTX_INTEGRATED_P (arg0) || ! RTX_INTEGRATED_P (arg1)) { rt_val = rtx_alloc (code); XEXP (rt_val, 0) = arg0; XEXP (rt_val, 1) = arg1; va_end (p); return rt_val; } hashcode = ((int) code + RTL_HASH (arg0) + RTL_HASH (arg1)); for (h = attr_hash_table[hashcode % RTL_HASH_SIZE]; h; h = h->next) if (h->hashcode == hashcode && GET_CODE (h->u.rtl) == code && XEXP (h->u.rtl, 0) == arg0 && XEXP (h->u.rtl, 1) == arg1) goto found; if (h == 0) { rtl_obstack = hash_obstack; rt_val = rtx_alloc (code); XEXP (rt_val, 0) = arg0; XEXP (rt_val, 1) = arg1; } } else if (GET_RTX_LENGTH (code) == 1 && GET_RTX_FORMAT (code)[0] == 's') { char * arg0 = va_arg (p, char *); if (code == SYMBOL_REF) arg0 = attr_string (arg0, strlen (arg0)); hashcode = ((int) code + RTL_HASH (arg0)); for (h = attr_hash_table[hashcode % RTL_HASH_SIZE]; h; h = h->next) if (h->hashcode == hashcode && GET_CODE (h->u.rtl) == code && XSTR (h->u.rtl, 0) == arg0) goto found; if (h == 0) { rtl_obstack = hash_obstack; rt_val = rtx_alloc (code); XSTR (rt_val, 0) = arg0; } } else if (GET_RTX_LENGTH (code) == 2 && GET_RTX_FORMAT (code)[0] == 's' && GET_RTX_FORMAT (code)[1] == 's') { char *arg0 = va_arg (p, char *); char *arg1 = va_arg (p, char *); hashcode = ((int) code + RTL_HASH (arg0) + RTL_HASH (arg1)); for (h = attr_hash_table[hashcode % RTL_HASH_SIZE]; h; h = h->next) if (h->hashcode == hashcode && GET_CODE (h->u.rtl) == code && XSTR (h->u.rtl, 0) == arg0 && XSTR (h->u.rtl, 1) == arg1) goto found; if (h == 0) { rtl_obstack = hash_obstack; rt_val = rtx_alloc (code); XSTR (rt_val, 0) = arg0; XSTR (rt_val, 1) = arg1; } } else if (code == CONST_INT) { HOST_WIDE_INT arg0 = va_arg (p, HOST_WIDE_INT); if (arg0 == 0) return false_rtx; if (arg0 == 1) return true_rtx; goto nohash; } else { nohash: rt_val = rtx_alloc (code); /* Allocate the storage space. */ fmt = GET_RTX_FORMAT (code); /* Find the right format... */ for (i = 0; i < GET_RTX_LENGTH (code); i++) { switch (*fmt++) { case '0': /* Unused field. */ break; case 'i': /* An integer? */ XINT (rt_val, i) = va_arg (p, int); break; case 'w': /* A wide integer? */ XWINT (rt_val, i) = va_arg (p, HOST_WIDE_INT); break; case 's': /* A string? */ XSTR (rt_val, i) = va_arg (p, char *); break; case 'e': /* An expression? */ case 'u': /* An insn? Same except when printing. */ XEXP (rt_val, i) = va_arg (p, rtx); break; case 'E': /* An RTX vector? */ XVEC (rt_val, i) = va_arg (p, rtvec); break; default: abort(); } } va_end (p); return rt_val; } rtl_obstack = old_obstack; va_end (p); attr_hash_add_rtx (hashcode, rt_val); RTX_INTEGRATED_P (rt_val) = 1; return rt_val; found: va_end (p); return h->u.rtl; } /* Create a new string printed with the printf line arguments into a space of at most LEN bytes: rtx attr_printf (len, format, [arg1, ..., argn]) */ #ifdef HAVE_VPRINTF /*VARARGS2*/ static char * attr_printf (va_alist) va_dcl { va_list p; register int len; register char *fmt; register char *str; /* Print the string into a temporary location. */ va_start (p); len = va_arg (p, int); str = (char *) alloca (len); fmt = va_arg (p, char *); vsprintf (str, fmt, p); va_end (p); return attr_string (str, strlen (str)); } #else /* not HAVE_VPRINTF */ static char * attr_printf (len, fmt, arg1, arg2, arg3) int len; char *fmt; char *arg1, *arg2, *arg3; /* also int */ { register char *str; /* Print the string into a temporary location. */ str = (char *) alloca (len); sprintf (str, fmt, arg1, arg2, arg3); return attr_string (str, strlen (str)); } #endif /* not HAVE_VPRINTF */ rtx attr_eq (name, value) char *name, *value; { return attr_rtx (EQ_ATTR, attr_string (name, strlen (name)), attr_string (value, strlen (value))); } char * attr_numeral (n) int n; { return XSTR (make_numeric_value (n), 0); } /* Return a permanent (possibly shared) copy of a string STR (not assumed to be null terminated) with LEN bytes. */ static char * attr_string (str, len) char *str; int len; { register struct attr_hash *h; int hashcode; int i; register char *new_str; /* Compute the hash code. */ hashcode = (len + 1) * 613 + (unsigned)str[0]; for (i = 1; i <= len; i += 2) hashcode = ((hashcode * 613) + (unsigned)str[i]); if (hashcode < 0) hashcode = -hashcode; /* Search the table for the string. */ for (h = attr_hash_table[hashcode % RTL_HASH_SIZE]; h; h = h->next) if (h->hashcode == -hashcode && h->u.str[0] == str[0] && !strncmp (h->u.str, str, len)) return h->u.str; /* <-- return if found. */ /* Not found; create a permanent copy and add it to the hash table. */ new_str = (char *) obstack_alloc (hash_obstack, len + 1); bcopy (str, new_str, len); new_str[len] = '\0'; attr_hash_add_string (hashcode, new_str); return new_str; /* Return the new string. */ } /* Check two rtx's for equality of contents, taking advantage of the fact that if both are hashed then they can't be equal unless they are the same object. */ int attr_equal_p (x, y) rtx x, y; { return (x == y || (! (RTX_INTEGRATED_P (x) && RTX_INTEGRATED_P (y)) && rtx_equal_p (x, y))); } /* Copy an attribute value expression, descending to all depths, but not copying any permanent hashed subexpressions. */ rtx attr_copy_rtx (orig) register rtx orig; { register rtx copy; register int i, j; register RTX_CODE code; register char *format_ptr; /* No need to copy a permanent object. */ if (RTX_INTEGRATED_P (orig)) return orig; code = GET_CODE (orig); switch (code) { case REG: case QUEUED: case CONST_INT: case CONST_DOUBLE: case SYMBOL_REF: case CODE_LABEL: case PC: case CC0: return orig; } copy = rtx_alloc (code); PUT_MODE (copy, GET_MODE (orig)); copy->in_struct = orig->in_struct; copy->volatil = orig->volatil; copy->unchanging = orig->unchanging; copy->integrated = orig->integrated; format_ptr = GET_RTX_FORMAT (GET_CODE (copy)); for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++) { switch (*format_ptr++) { case 'e': XEXP (copy, i) = XEXP (orig, i); if (XEXP (orig, i) != NULL) XEXP (copy, i) = attr_copy_rtx (XEXP (orig, i)); break; case 'E': case 'V': XVEC (copy, i) = XVEC (orig, i); if (XVEC (orig, i) != NULL) { XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i)); for (j = 0; j < XVECLEN (copy, i); j++) XVECEXP (copy, i, j) = attr_copy_rtx (XVECEXP (orig, i, j)); } break; case 'n': case 'i': XINT (copy, i) = XINT (orig, i); break; case 'w': XWINT (copy, i) = XWINT (orig, i); break; case 's': case 'S': XSTR (copy, i) = XSTR (orig, i); break; default: abort (); } } return copy; } /* Given a test expression for an attribute, ensure it is validly formed. IS_CONST indicates whether the expression is constant for each compiler run (a constant expression may not test any particular insn). Convert (eq_attr "att" "a1,a2") to (ior (eq_attr ... ) (eq_attrq ..)) and (eq_attr "att" "!a1") to (not (eq_attr "att" "a1")). Do the latter test first so that (eq_attr "att" "!a1,a2,a3") works as expected. Update the string address in EQ_ATTR expression to be the same used in the attribute (or `alternative_name') to speed up subsequent `find_attr' calls and eliminate most `strcmp' calls. Return the new expression, if any. */ static rtx check_attr_test (exp, is_const) rtx exp; int is_const; { struct attr_desc *attr; struct attr_value *av; char *name_ptr, *p; rtx orexp, newexp; switch (GET_CODE (exp)) { case EQ_ATTR: /* Handle negation test. */ if (XSTR (exp, 1)[0] == '!') return check_attr_test (attr_rtx (NOT, attr_eq (XSTR (exp, 0), &XSTR (exp, 1)[1])), is_const); else if (n_comma_elts (XSTR (exp, 1)) == 1) { attr = find_attr (XSTR (exp, 0), 0); if (attr == NULL) { if (! strcmp (XSTR (exp, 0), "alternative")) { XSTR (exp, 0) = alternative_name; /* This can't be simplified any further. */ RTX_UNCHANGING_P (exp) = 1; return exp; } else fatal ("Unknown attribute `%s' in EQ_ATTR", XEXP (exp, 0)); } if (is_const && ! attr->is_const) fatal ("Constant expression uses insn attribute `%s' in EQ_ATTR", XEXP (exp, 0)); /* Copy this just to make it permanent, so expressions using it can be permanent too. */ exp = attr_eq (XSTR (exp, 0), XSTR (exp, 1)); /* It shouldn't be possible to simplify the value given to a constant attribute, so don't expand this until it's time to write the test expression. */ if (attr->is_const) RTX_UNCHANGING_P (exp) = 1; if (attr->is_numeric) { for (p = XSTR (exp, 1); *p; p++) if (*p < '0' || *p > '9') fatal ("Attribute `%s' takes only numeric values", XEXP (exp, 0)); } else { for (av = attr->first_value; av; av = av->next) if (GET_CODE (av->value) == CONST_STRING && ! strcmp (XSTR (exp, 1), XSTR (av->value, 0))) break; if (av == NULL) fatal ("Unknown value `%s' for `%s' attribute", XEXP (exp, 1), XEXP (exp, 0)); } } else { /* Make an IOR tree of the possible values. */ orexp = false_rtx; name_ptr = XSTR (exp, 1); while ((p = next_comma_elt (&name_ptr)) != NULL) { newexp = attr_eq (XSTR (exp, 0), p); orexp = insert_right_side (IOR, orexp, newexp, -2); } return check_attr_test (orexp, is_const); } break; case CONST_INT: /* Either TRUE or FALSE. */ if (XWINT (exp, 0)) return true_rtx; else return false_rtx; case IOR: case AND: XEXP (exp, 0) = check_attr_test (XEXP (exp, 0), is_const); XEXP (exp, 1) = check_attr_test (XEXP (exp, 1), is_const); break; case NOT: XEXP (exp, 0) = check_attr_test (XEXP (exp, 0), is_const); break; case MATCH_OPERAND: if (is_const) fatal ("RTL operator \"%s\" not valid in constant attribute test", GET_RTX_NAME (MATCH_OPERAND)); /* These cases can't be simplified. */ RTX_UNCHANGING_P (exp) = 1; break; case LE: case LT: case GT: case GE: case LEU: case LTU: case GTU: case GEU: case NE: case EQ: if (GET_CODE (XEXP (exp, 0)) == SYMBOL_REF && GET_CODE (XEXP (exp, 1)) == SYMBOL_REF) exp = attr_rtx (GET_CODE (exp), attr_rtx (SYMBOL_REF, XSTR (XEXP (exp, 0), 0)), attr_rtx (SYMBOL_REF, XSTR (XEXP (exp, 1), 0))); /* These cases can't be simplified. */ RTX_UNCHANGING_P (exp) = 1; break; case SYMBOL_REF: if (is_const) { /* These cases are valid for constant attributes, but can't be simplified. */ exp = attr_rtx (SYMBOL_REF, XSTR (exp, 0)); RTX_UNCHANGING_P (exp) = 1; break; } default: fatal ("RTL operator \"%s\" not valid in attribute test", GET_RTX_NAME (GET_CODE (exp))); } return exp; } /* Given an expression, ensure that it is validly formed and that all named attribute values are valid for the given attribute. Issue a fatal error if not. If no attribute is specified, assume a numeric attribute. Return a perhaps modified replacement expression for the value. */ static rtx check_attr_value (exp, attr) rtx exp; struct attr_desc *attr; { struct attr_value *av; char *p; int i; switch (GET_CODE (exp)) { case CONST_INT: if (attr && ! attr->is_numeric) fatal ("CONST_INT not valid for non-numeric `%s' attribute", attr->name); if (INTVAL (exp) < 0) fatal ("Negative numeric value specified for `%s' attribute", attr->name); break; case CONST_STRING: if (! strcmp (XSTR (exp, 0), "*")) break; if (attr == 0 || attr->is_numeric) { for (p = XSTR (exp, 0); *p; p++) if (*p > '9' || *p < '0') fatal ("Non-numeric value for numeric `%s' attribute", attr ? attr->name : "internal"); break; } for (av = attr->first_value; av; av = av->next) if (GET_CODE (av->value) == CONST_STRING && ! strcmp (XSTR (av->value, 0), XSTR (exp, 0))) break; if (av == NULL) fatal ("Unknown value `%s' for `%s' attribute", XSTR (exp, 0), attr ? attr->name : "internal"); break; case IF_THEN_ELSE: XEXP (exp, 0) = check_attr_test (XEXP (exp, 0), attr ? attr->is_const : 0); XEXP (exp, 1) = check_attr_value (XEXP (exp, 1), attr); XEXP (exp, 2) = check_attr_value (XEXP (exp, 2), attr); break; case COND: if (XVECLEN (exp, 0) % 2 != 0) fatal ("First operand of COND must have even length"); for (i = 0; i < XVECLEN (exp, 0); i += 2) { XVECEXP (exp, 0, i) = check_attr_test (XVECEXP (exp, 0, i), attr ? attr->is_const : 0); XVECEXP (exp, 0, i + 1) = check_attr_value (XVECEXP (exp, 0, i + 1), attr); } XEXP (exp, 1) = check_attr_value (XEXP (exp, 1), attr); break; case SYMBOL_REF: if (attr && attr->is_const) /* A constant SYMBOL_REF is valid as a constant attribute test and is expanded later by make_canonical into a COND. */ return attr_rtx (SYMBOL_REF, XSTR (exp, 0)); /* Otherwise, fall through... */ default: fatal ("Illegal operation `%s' for attribute value", GET_RTX_NAME (GET_CODE (exp))); } return exp; } /* Given an SET_ATTR_ALTERNATIVE expression, convert to the canonical SET. It becomes a COND with each test being (eq_attr "alternative "n") */ static rtx convert_set_attr_alternative (exp, num_alt, insn_code, insn_index) rtx exp; int num_alt; int insn_code, insn_index; { rtx newexp; rtx condexp; int i; if (XVECLEN (exp, 1) != num_alt) fatal ("Bad number of entries in SET_ATTR_ALTERNATIVE for insn %d", insn_index); /* Make a COND with all tests but the last. Select the last value via the default. */ condexp = rtx_alloc (COND); XVEC (condexp, 0) = rtvec_alloc ((num_alt - 1) * 2); for (i = 0; i < num_alt - 1; i++) { char *p; p = attr_numeral (i); XVECEXP (condexp, 0, 2 * i) = attr_eq (alternative_name, p); #if 0 /* Sharing this EQ_ATTR rtl causes trouble. */ XVECEXP (condexp, 0, 2 * i) = rtx_alloc (EQ_ATTR); XSTR (XVECEXP (condexp, 0, 2 * i), 0) = alternative_name; XSTR (XVECEXP (condexp, 0, 2 * i), 1) = p; #endif XVECEXP (condexp, 0, 2 * i + 1) = XVECEXP (exp, 1, i); } XEXP (condexp, 1) = XVECEXP (exp, 1, i); return attr_rtx (SET, attr_rtx (ATTR, XSTR (exp, 0)), condexp); } /* Given a SET_ATTR, convert to the appropriate SET. If a comma-separated list of values is given, convert to SET_ATTR_ALTERNATIVE first. */ static rtx convert_set_attr (exp, num_alt, insn_code, insn_index) rtx exp; int num_alt; int insn_code, insn_index; { rtx newexp; char *name_ptr; char *p; int n; /* See how many alternative specified. */ n = n_comma_elts (XSTR (exp, 1)); if (n == 1) return attr_rtx (SET, attr_rtx (ATTR, XSTR (exp, 0)), attr_rtx (CONST_STRING, XSTR (exp, 1))); newexp = rtx_alloc (SET_ATTR_ALTERNATIVE); XSTR (newexp, 0) = XSTR (exp, 0); XVEC (newexp, 1) = rtvec_alloc (n); /* Process each comma-separated name. */ name_ptr = XSTR (exp, 1); n = 0; while ((p = next_comma_elt (&name_ptr)) != NULL) XVECEXP (newexp, 1, n++) = attr_rtx (CONST_STRING, p); return convert_set_attr_alternative (newexp, num_alt, insn_code, insn_index); } /* Scan all definitions, checking for validity. Also, convert any SET_ATTR and SET_ATTR_ALTERNATIVE expressions to the corresponding SET expressions. */ static void check_defs () { struct insn_def *id; struct attr_desc *attr; int i; rtx value; for (id = defs; id; id = id->next) { if (XVEC (id->def, id->vec_idx) == NULL) continue; for (i = 0; i < XVECLEN (id->def, id->vec_idx); i++) { value = XVECEXP (id->def, id->vec_idx, i); switch (GET_CODE (value)) { case SET: if (GET_CODE (XEXP (value, 0)) != ATTR) fatal ("Bad attribute set in pattern %d", id->insn_index); break; case SET_ATTR_ALTERNATIVE: value = convert_set_attr_alternative (value, id->num_alternatives, id->insn_code, id->insn_index); break; case SET_ATTR: value = convert_set_attr (value, id->num_alternatives, id->insn_code, id->insn_index); break; default: fatal ("Invalid attribute code `%s' for pattern %d", GET_RTX_NAME (GET_CODE (value)), id->insn_index); } if ((attr = find_attr (XSTR (XEXP (value, 0), 0), 0)) == NULL) fatal ("Unknown attribute `%s' for pattern number %d", XSTR (XEXP (value, 0), 0), id->insn_index); XVECEXP (id->def, id->vec_idx, i) = value; XEXP (value, 1) = check_attr_value (XEXP (value, 1), attr); } } } /* Given a constant SYMBOL_REF expression, convert to a COND that explicitly tests each enumerated value. */ static rtx convert_const_symbol_ref (exp, attr) rtx exp; struct attr_desc *attr; { rtx condexp; struct attr_value *av; int i; int num_alt = 0; for (av = attr->first_value; av; av = av->next) num_alt++; /* Make a COND with all tests but the last, and in the original order. Select the last value via the default. Note that the attr values are constructed in reverse order. */ condexp = rtx_alloc (COND); XVEC (condexp, 0) = rtvec_alloc ((num_alt - 1) * 2); av = attr->first_value; XEXP (condexp, 1) = av->value; for (i = num_alt - 2; av = av->next, i >= 0; i--) { char *p, *string; rtx value; string = p = (char *) xmalloc (2 + strlen (attr->name) + strlen (XSTR (av->value, 0))); strcpy (p, attr->name); strcat (p, "_"); strcat (p, XSTR (av->value, 0)); for (; *p != '\0'; p++) if (*p >= 'a' && *p <= 'z') *p -= 'a' - 'A'; value = attr_rtx (SYMBOL_REF, string); RTX_UNCHANGING_P (value) = 1; XVECEXP (condexp, 0, 2 * i) = attr_rtx (EQ, exp, value); XVECEXP (condexp, 0, 2 * i + 1) = av->value; } return condexp; } /* Given a valid expression for an attribute value, remove any IF_THEN_ELSE expressions by converting them into a COND. This removes cases from this program. Also, replace an attribute value of "*" with the default attribute value. */ static rtx make_canonical (attr, exp) struct attr_desc *attr; rtx exp; { int i; rtx newexp; switch (GET_CODE (exp)) { case CONST_INT: exp = make_numeric_value (INTVAL (exp)); break; case CONST_STRING: if (! strcmp (XSTR (exp, 0), "*")) { if (attr == 0 || attr->default_val == 0) fatal ("(attr_value \"*\") used in invalid context."); exp = attr->default_val->value; } break; case SYMBOL_REF: if (!attr->is_const || RTX_UNCHANGING_P (exp)) break; /* The SYMBOL_REF is constant for a given run, so mark it as unchanging. This makes the COND something that won't be considered an arbitrary expression by walk_attr_value. */ RTX_UNCHANGING_P (exp) = 1; exp = convert_const_symbol_ref (exp, attr); RTX_UNCHANGING_P (exp) = 1; exp = check_attr_value (exp, attr); /* Goto COND case since this is now a COND. Note that while the new expression is rescanned, all symbol_ref notes are mared as unchanging. */ goto cond; case IF_THEN_ELSE: newexp = rtx_alloc (COND); XVEC (newexp, 0) = rtvec_alloc (2); XVECEXP (newexp, 0, 0) = XEXP (exp, 0); XVECEXP (newexp, 0, 1) = XEXP (exp, 1); XEXP (newexp, 1) = XEXP (exp, 2); exp = newexp; /* Fall through to COND case since this is now a COND. */ case COND: cond: { int allsame = 1; rtx defval; /* First, check for degenerate COND. */ if (XVECLEN (exp, 0) == 0) return make_canonical (attr, XEXP (exp, 1)); defval = XEXP (exp, 1) = make_canonical (attr, XEXP (exp, 1)); for (i = 0; i < XVECLEN (exp, 0); i += 2) { XVECEXP (exp, 0, i) = copy_boolean (XVECEXP (exp, 0, i)); XVECEXP (exp, 0, i + 1) = make_canonical (attr, XVECEXP (exp, 0, i + 1)); if (! rtx_equal_p (XVECEXP (exp, 0, i + 1), defval)) allsame = 0; } if (allsame) return defval; break; } } return exp; } static rtx copy_boolean (exp) rtx exp; { if (GET_CODE (exp) == AND || GET_CODE (exp) == IOR) return attr_rtx (GET_CODE (exp), copy_boolean (XEXP (exp, 0)), copy_boolean (XEXP (exp, 1))); return exp; } /* Given a value and an attribute description, return a `struct attr_value *' that represents that value. This is either an existing structure, if the value has been previously encountered, or a newly-created structure. `insn_code' is the code of an insn whose attribute has the specified value (-2 if not processing an insn). We ensure that all insns for a given value have the same number of alternatives if the value checks alternatives. */ static struct attr_value * get_attr_value (value, attr, insn_code) rtx value; struct attr_desc *attr; int insn_code; { struct attr_value *av; int num_alt = 0; value = make_canonical (attr, value); if (compares_alternatives_p (value)) { if (insn_code < 0 || insn_alternatives == NULL) fatal ("(eq_attr \"alternatives\" ...) used in non-insn context"); else num_alt = insn_alternatives[insn_code]; } for (av = attr->first_value; av; av = av->next) if (rtx_equal_p (value, av->value) && (num_alt == 0 || av->first_insn == NULL || insn_alternatives[av->first_insn->insn_code])) return av; av = (struct attr_value *) xmalloc (sizeof (struct attr_value)); av->value = value; av->next = attr->first_value; attr->first_value = av; av->first_insn = NULL; av->num_insns = 0; av->has_asm_insn = 0; return av; } /* After all DEFINE_DELAYs have been read in, create internal attributes to generate the required routines. First, we compute the number of delay slots for each insn (as a COND of each of the test expressions in DEFINE_DELAYs). Then, if more than one delay type is specified, we compute a similar function giving the DEFINE_DELAY ordinal for each insn. Finally, for each [DEFINE_DELAY, slot #] pair, we compute an attribute that tells whether a given insn can be in that delay slot. Normal attribute filling and optimization expands these to contain the information needed to handle delay slots. */ static void expand_delays () { struct delay_desc *delay; rtx condexp; rtx newexp; int i; char *p; /* First, generate data for `num_delay_slots' function. */ condexp = rtx_alloc (COND); XVEC (condexp, 0) = rtvec_alloc (num_delays * 2); XEXP (condexp, 1) = make_numeric_value (0); for (i = 0, delay = delays; delay; i += 2, delay = delay->next) { XVECEXP (condexp, 0, i) = XEXP (delay->def, 0); XVECEXP (condexp, 0, i + 1) = make_numeric_value (XVECLEN (delay->def, 1) / 3); } make_internal_attr ("*num_delay_slots", condexp, 0); /* If more than one delay type, do the same for computing the delay type. */ if (num_delays > 1) { condexp = rtx_alloc (COND); XVEC (condexp, 0) = rtvec_alloc (num_delays * 2); XEXP (condexp, 1) = make_numeric_value (0); for (i = 0, delay = delays; delay; i += 2, delay = delay->next) { XVECEXP (condexp, 0, i) = XEXP (delay->def, 0); XVECEXP (condexp, 0, i + 1) = make_numeric_value (delay->num); } make_internal_attr ("*delay_type", condexp, 1); } /* For each delay possibility and delay slot, compute an eligibility attribute for non-annulled insns and for each type of annulled (annul if true and annul if false). */ for (delay = delays; delay; delay = delay->next) { for (i = 0; i < XVECLEN (delay->def, 1); i += 3) { condexp = XVECEXP (delay->def, 1, i); if (condexp == 0) condexp = false_rtx; newexp = attr_rtx (IF_THEN_ELSE, condexp, make_numeric_value (1), make_numeric_value (0)); p = attr_printf (13, "*delay_%d_%d", delay->num, i / 3); make_internal_attr (p, newexp, 1); if (have_annul_true) { condexp = XVECEXP (delay->def, 1, i + 1); if (condexp == 0) condexp = false_rtx; newexp = attr_rtx (IF_THEN_ELSE, condexp, make_numeric_value (1), make_numeric_value (0)); p = attr_printf (18, "*annul_true_%d_%d", delay->num, i / 3); make_internal_attr (p, newexp, 1); } if (have_annul_false) { condexp = XVECEXP (delay->def, 1, i + 2); if (condexp == 0) condexp = false_rtx; newexp = attr_rtx (IF_THEN_ELSE, condexp, make_numeric_value (1), make_numeric_value (0)); p = attr_printf (18, "*annul_false_%d_%d", delay->num, i / 3); make_internal_attr (p, newexp, 1); } } } } /* This function is given a left and right side expression and an operator. Each side is a conditional expression, each alternative of which has a numerical value. The function returns another conditional expression which, for every possible set of condition values, returns a value that is the operator applied to the values of the two sides. Since this is called early, it must also support IF_THEN_ELSE. */ static rtx operate_exp (op, left, right) enum operator op; rtx left, right; { int left_value, right_value; rtx newexp; int i; /* If left is a string, apply operator to it and the right side. */ if (GET_CODE (left) == CONST_STRING) { /* If right is also a string, just perform the operation. */ if (GET_CODE (right) == CONST_STRING) { left_value = atoi (XSTR (left, 0)); right_value = atoi (XSTR (right, 0)); switch (op) { case PLUS_OP: i = left_value + right_value; break; case MINUS_OP: i = left_value - right_value; break; case OR_OP: i = left_value | right_value; break; case MAX_OP: if (left_value > right_value) i = left_value; else i = right_value; break; default: abort (); } return make_numeric_value (i); } else if (GET_CODE (right) == IF_THEN_ELSE) { /* Apply recursively to all values within. */ rtx newleft = operate_exp (op, left, XEXP (right, 1)); rtx newright = operate_exp (op, left, XEXP (right, 2)); if (rtx_equal_p (newleft, newright)) return newleft; return attr_rtx (IF_THEN_ELSE, XEXP (right, 0), newleft, newright); } else if (GET_CODE (right) == COND) { int allsame = 1; rtx defval; newexp = rtx_alloc (COND); XVEC (newexp, 0) = rtvec_alloc (XVECLEN (right, 0)); defval = XEXP (newexp, 1) = operate_exp (op, left, XEXP (right, 1)); for (i = 0; i < XVECLEN (right, 0); i += 2) { XVECEXP (newexp, 0, i) = XVECEXP (right, 0, i); XVECEXP (newexp, 0, i + 1) = operate_exp (op, left, XVECEXP (right, 0, i + 1)); if (! rtx_equal_p (XVECEXP (newexp, 0, i + 1), defval)) allsame = 0; } /* If the resulting cond is trivial (all alternatives give the same value), optimize it away. */ if (allsame) { obstack_free (rtl_obstack, newexp); return operate_exp (op, left, XEXP (right, 1)); } /* If the result is the same as the RIGHT operand, just use that. */ if (rtx_equal_p (newexp, right)) { obstack_free (rtl_obstack, newexp); return right; } return newexp; } else fatal ("Badly formed attribute value"); } /* Otherwise, do recursion the other way. */ else if (GET_CODE (left) == IF_THEN_ELSE) { rtx newleft = operate_exp (op, XEXP (left, 1), right); rtx newright = operate_exp (op, XEXP (left, 2), right); if (rtx_equal_p (newleft, newright)) return newleft; return attr_rtx (IF_THEN_ELSE, XEXP (left, 0), newleft, newright); } else if (GET_CODE (left) == COND) { int allsame = 1; rtx defval; newexp = rtx_alloc (COND); XVEC (newexp, 0) = rtvec_alloc (XVECLEN (left, 0)); defval = XEXP (newexp, 1) = operate_exp (op, XEXP (left, 1), right); for (i = 0; i < XVECLEN (left, 0); i += 2) { XVECEXP (newexp, 0, i) = XVECEXP (left, 0, i); XVECEXP (newexp, 0, i + 1) = operate_exp (op, XVECEXP (left, 0, i + 1), right); if (! rtx_equal_p (XVECEXP (newexp, 0, i + 1), defval)) allsame = 0; } /* If the cond is trivial (all alternatives give the same value), optimize it away. */ if (allsame) { obstack_free (rtl_obstack, newexp); return operate_exp (op, XEXP (left, 1), right); } /* If the result is the same as the LEFT operand, just use that. */ if (rtx_equal_p (newexp, left)) { obstack_free (rtl_obstack, newexp); return left; } return newexp; } else fatal ("Badly formed attribute value."); /* NOTREACHED */ return NULL; } /* Once all attributes and DEFINE_FUNCTION_UNITs have been read, we construct a number of attributes. The first produces a function `function_units_used' which is given an insn and produces a mask showing which function units are required for the execution of that insn. The second produces a function `result_ready_cost' which is used to determine the time that the result of an insn will be ready and hence a worst-case schedule. Both of these produce quite complex expressions which are then set as the default value of internal attributes. Normal attribute simplification should produce reasonable expressions. For each unit, a `_unit_ready_cost' function will take an insn and give the delay until that unit will be ready with the result and a `_unit_busy_delay' function is given an insn already executing on the unit and a candidate to execute and will give the cost from the time the executing insn started until the candidate can start (ignore limitations on the number of simultaneous insns). */ static void expand_units () { struct function_unit *unit; struct function_unit_op *op; rtx unitsmask; rtx readycost; rtx newexp; char *str; /* Initially, cost and masks are zero. */ unitsmask = readycost = make_numeric_value (0); /* Set up a conditional for costs and unit mask. */ newexp = rtx_alloc (IF_THEN_ELSE); XEXP (newexp, 2) = make_numeric_value (0); /* For each unit, insert its contribution to the above three values. */ for (unit = units; unit; unit = unit->next) { /* An expression that computes the ready cost for this unit. */ rtx readyexp = rtx_alloc (COND); /* An expression that maps insns to operation number for conflicts. */ rtx caseexp = rtx_alloc (COND); XVEC (readyexp, 0) = rtvec_alloc ((unit->num_opclasses - 1) * 2); XVEC (caseexp, 0) = rtvec_alloc ((unit->num_opclasses - 1) * 2); for (op = unit->ops; op; op = op->next) { /* Validate the expressions we were given for the conditions and busy cost. Then make an attribute for use in the conflict function. */ op->condexp = check_attr_test (op->condexp, 0); op->busyexp = check_attr_value (op->busyexp, NULL_ATTR); str = attr_printf (strlen (unit->name) + 11, "*%s_case_%d", unit->name, op->num); make_internal_attr (str, make_canonical (NULL_ATTR, op->busyexp)); /* Make our adjustment to the two COND's being computed. If we are the last operation class, place our values into the default of the COND. */ if (op->num == unit->num_opclasses - 1) { XEXP (readyexp, 1) = make_numeric_value (op->ready); XEXP (caseexp, 1) = make_numeric_value (op->num); } else { XVECEXP (readyexp, 0, op->num * 2) = op->condexp; XVECEXP (readyexp, 0, op->num * 2 + 1) = make_numeric_value (op->ready); XVECEXP (caseexp, 0, op->num * 2) = op->condexp; XVECEXP (caseexp, 0, op->num * 2 + 1) = make_numeric_value (op->num); } } /* Make an attribute for the case number and ready delay. */ str = attr_printf (strlen (unit->name) + 8, "*%s_cases", unit->name); make_internal_attr (str, caseexp, 1); str = attr_printf (strlen (unit->name) + 20, "*%s_unit_ready_cost", unit->name); make_internal_attr (str, readyexp, 0); /* Merge this function unit into the ready cost and unit mask attributes. */ XEXP (newexp, 0) = check_attr_test (unit->condexp, 0); XEXP (newexp, 1) = make_numeric_value (1 << unit->num); unitsmask = operate_exp (OR_OP, unitsmask, newexp); XEXP (newexp, 1) = readyexp; readycost = operate_exp (MAX_OP, readycost, newexp); } make_internal_attr ("*function_units_used", unitsmask, 0); make_internal_attr ("*result_ready_cost", readycost, 0); } /* Once all attributes and insns have been read and checked, we construct for each attribute value a list of all the insns that have that value for the attribute. */ static void fill_attr (attr) struct attr_desc *attr; { struct attr_value *av; struct insn_ent *ie; struct insn_def *id; int i; rtx value; /* Don't fill constant attributes. The value is independent of any particular insn. */ if (attr->is_const) return; for (id = defs; id; id = id->next) { /* If no value is specified for this insn for this attribute, use the default. */ value = NULL; if (XVEC (id->def, id->vec_idx)) for (i = 0; i < XVECLEN (id->def, id->vec_idx); i++) if (! strcmp (XSTR (XEXP (XVECEXP (id->def, id->vec_idx, i), 0), 0), attr->name)) value = XEXP (XVECEXP (id->def, id->vec_idx, i), 1); if (value == NULL) av = attr->default_val; else av = get_attr_value (value, attr, id->insn_code); ie = (struct insn_ent *) xmalloc (sizeof (struct insn_ent)); ie->insn_code = id->insn_code; ie->insn_index = id->insn_code; insert_insn_ent (av, ie); } } /* Given an expression EXP, see if it is a COND or IF_THEN_ELSE that has a test that checks relative positions of insns (uses MATCH_DUP or PC). If so, replace it with what is obtained by passing the expression to ADDRESS_FN. If not but it is a COND or IF_THEN_ELSE, call this routine recursively on each value (including the default value). Otherwise, return the value returned by NO_ADDRESS_FN applied to EXP. */ static rtx substitute_address (exp, no_address_fn, address_fn) rtx exp; rtx (*no_address_fn) (); rtx (*address_fn) (); { int i; rtx newexp; if (GET_CODE (exp) == COND) { /* See if any tests use addresses. */ address_used = 0; for (i = 0; i < XVECLEN (exp, 0); i += 2) walk_attr_value (XVECEXP (exp, 0, i)); if (address_used) return (*address_fn) (exp); /* Make a new copy of this COND, replacing each element. */ newexp = rtx_alloc (COND); XVEC (newexp, 0) = rtvec_alloc (XVECLEN (exp, 0)); for (i = 0; i < XVECLEN (exp, 0); i += 2) { XVECEXP (newexp, 0, i) = XVECEXP (exp, 0, i); XVECEXP (newexp, 0, i + 1) = substitute_address (XVECEXP (exp, 0, i + 1), no_address_fn, address_fn); } XEXP (newexp, 1) = substitute_address (XEXP (exp, 1), no_address_fn, address_fn); return newexp; } else if (GET_CODE (exp) == IF_THEN_ELSE) { address_used = 0; walk_attr_value (XEXP (exp, 0)); if (address_used) return (*address_fn) (exp); return attr_rtx (IF_THEN_ELSE, substitute_address (XEXP (exp, 0), no_address_fn, address_fn), substitute_address (XEXP (exp, 1), no_address_fn, address_fn), substitute_address (XEXP (exp, 2), no_address_fn, address_fn)); } return (*no_address_fn) (exp); } /* Make new attributes from the `length' attribute. The following are made, each corresponding to a function called from `shorten_branches' or `get_attr_length': *insn_default_length This is the length of the insn to be returned by `get_attr_length' before `shorten_branches' has been called. In each case where the length depends on relative addresses, the largest possible is used. This routine is also used to compute the initial size of the insn. *insn_variable_length_p This returns 1 if the insn's length depends on relative addresses, zero otherwise. *insn_current_length This is only called when it is known that the insn has a variable length and returns the current length, based on relative addresses. */ static void make_length_attrs () { static char *new_names[] = {"*insn_default_length", "*insn_variable_length_p", "*insn_current_length"}; static rtx (*no_address_fn[]) () = {identity_fn, zero_fn, zero_fn}; static rtx (*address_fn[]) () = {max_fn, one_fn, identity_fn}; int i; struct attr_desc *length_attr, *new_attr; struct attr_value *av, *new_av; struct insn_ent *ie, *new_ie; /* See if length attribute is defined. If so, it must be numeric. Make it special so we don't output anything for it. */ length_attr = find_attr ("length", 0); if (length_attr == 0) return; if (! length_attr->is_numeric) fatal ("length attribute must be numeric."); length_attr->is_const = 0; length_attr->is_special = 1; /* Make each new attribute, in turn. */ for (i = 0; i < sizeof new_names / sizeof new_names[0]; i++) { make_internal_attr (new_names[i], substitute_address (length_attr->default_val->value, no_address_fn[i], address_fn[i]), 0); new_attr = find_attr (new_names[i], 0); for (av = length_attr->first_value; av; av = av->next) for (ie = av->first_insn; ie; ie = ie->next) { new_av = get_attr_value (substitute_address (av->value, no_address_fn[i], address_fn[i]), new_attr, ie->insn_code); new_ie = (struct insn_ent *) xmalloc (sizeof (struct insn_ent)); new_ie->insn_code = ie->insn_code; new_ie->insn_index = ie->insn_index; insert_insn_ent (new_av, new_ie); } } } /* Utility functions called from above routine. */ static rtx identity_fn (exp) rtx exp; { return exp; } static rtx zero_fn (exp) rtx exp; { return make_numeric_value (0); } static rtx one_fn (exp) rtx exp; { return make_numeric_value (1); } static rtx max_fn (exp) rtx exp; { return make_numeric_value (max_attr_value (exp)); } /* Take a COND expression and see if any of the conditions in it can be simplified. If any are known true or known false for the particular insn code, the COND can be further simplified. Also call ourselves on any COND operations that are values of this COND. We do not modify EXP; rather, we make and return a new rtx. */ static rtx simplify_cond (exp, insn_code, insn_index) rtx exp; int insn_code, insn_index; { int i, j; /* We store the desired contents here, then build a new expression if they don't match EXP. */ rtx defval = XEXP (exp, 1); rtx new_defval = XEXP (exp, 1); int len = XVECLEN (exp, 0); rtx *tests = (rtx *) alloca (len * sizeof (rtx)); int allsame = 1; char *spacer, *first_spacer; /* This lets us free all storage allocated below, if appropriate. */ first_spacer = (char *) obstack_finish (rtl_obstack); bcopy (&XVECEXP (exp, 0, 0), tests, len * sizeof (rtx)); /* See if default value needs simplification. */ if (GET_CODE (defval) == COND) new_defval = simplify_cond (defval, insn_code, insn_index); /* Simplify the subexpressions, and see what tests we can get rid of. */ for (i = 0; i < len; i += 2) { rtx newtest, newval; /* Simplify this test. */ newtest = SIMPLIFY_TEST_EXP (tests[i], insn_code, insn_index); tests[i] = newtest; newval = tests[i + 1]; /* See if this value may need simplification. */ if (GET_CODE (newval) == COND) newval = simplify_cond (newval, insn_code, insn_index); /* Look for ways to delete or combine this test. */ if (newtest == true_rtx) { /* If test is true, make this value the default and discard this + any following tests. */ len = i; defval = tests[i + 1]; new_defval = newval; } else if (newtest == false_rtx) { /* If test is false, discard it and its value. */ for (j = i; j < len - 2; j++) tests[j] = tests[j + 2]; len -= 2; } else if (i > 0 && attr_equal_p (newval, tests[i - 1])) { /* If this value and the value for the prev test are the same, merge the tests. */ tests[i - 2] = insert_right_side (IOR, tests[i - 2], newtest, insn_code, insn_index); /* Delete this test/value. */ for (j = i; j < len - 2; j++) tests[j] = tests[j + 2]; len -= 2; } else tests[i + 1] = newval; } /* If the last test in a COND has the same value as the default value, that test isn't needed. */ while (len > 0 && attr_equal_p (tests[len - 1], new_defval)) len -= 2; /* See if we changed anything. */ if (len != XVECLEN (exp, 0) || new_defval != XEXP (exp, 1)) allsame = 0; else for (i = 0; i < len; i++) if (! attr_equal_p (tests[i], XVECEXP (exp, 0, i))) { allsame = 0; break; } if (len == 0) { obstack_free (rtl_obstack, first_spacer); if (GET_CODE (defval) == COND) return simplify_cond (defval, insn_code, insn_index); return defval; } else if (allsame) { obstack_free (rtl_obstack, first_spacer); return exp; } else { rtx newexp = rtx_alloc (COND); XVEC (newexp, 0) = rtvec_alloc (len); bcopy (tests, &XVECEXP (newexp, 0, 0), len * sizeof (rtx)); XEXP (newexp, 1) = new_defval; return newexp; } } /* Remove an insn entry from an attribute value. */ static void remove_insn_ent (av, ie) struct attr_value *av; struct insn_ent *ie; { struct insn_ent *previe; if (av->first_insn == ie) av->first_insn = ie->next; else { for (previe = av->first_insn; previe->next != ie; previe = previe->next) ; previe->next = ie->next; } av->num_insns--; if (ie->insn_code == -1) av->has_asm_insn = 0; } /* Insert an insn entry in an attribute value list. */ static void insert_insn_ent (av, ie) struct attr_value *av; struct insn_ent *ie; { ie->next = av->first_insn; av->first_insn = ie; av->num_insns++; if (ie->insn_code == -1) av->has_asm_insn = 1; } /* This is a utility routine to take an expression that is a tree of either AND or IOR expressions and insert a new term. The new term will be inserted at the right side of the first node whose code does not match the root. A new node will be created with the root's code. Its left side will be the old right side and its right side will be the new term. If the `term' is itself a tree, all its leaves will be inserted. */ static rtx insert_right_side (code, exp, term, insn_code, insn_index) RTX_CODE code; rtx exp; rtx term; int insn_code, insn_index; { rtx newexp; /* Avoid consing in some special cases. */ if (code == AND && term == true_rtx) return exp; if (code == AND && term == false_rtx) return false_rtx; if (code == AND && exp == true_rtx) return term; if (code == AND && exp == false_rtx) return false_rtx; if (code == IOR && term == true_rtx) return true_rtx; if (code == IOR && term == false_rtx) return exp; if (code == IOR && exp == true_rtx) return true_rtx; if (code == IOR && exp == false_rtx) return term; if (attr_equal_p (exp, term)) return exp; if (GET_CODE (term) == code) { exp = insert_right_side (code, exp, XEXP (term, 0), insn_code, insn_index); exp = insert_right_side (code, exp, XEXP (term, 1), insn_code, insn_index); return exp; } if (GET_CODE (exp) == code) { rtx new = insert_right_side (code, XEXP (exp, 1), term, insn_code, insn_index); if (new != XEXP (exp, 1)) /* Make a copy of this expression and call recursively. */ newexp = attr_rtx (code, XEXP (exp, 0), new); else newexp = exp; } else { /* Insert the new term. */ newexp = attr_rtx (code, exp, term); } return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } /* If we have an expression which AND's a bunch of (not (eq_attrq "alternative" "n")) terms, we may have covered all or all but one of the possible alternatives. If so, we can optimize. Similarly for IOR's of EQ_ATTR. This routine is passed an expression and either AND or IOR. It returns a bitmask indicating which alternatives are present. ??? What does "present" mean? */ static int compute_alternative_mask (exp, code) rtx exp; RTX_CODE code; { char *string; if (GET_CODE (exp) == code) return compute_alternative_mask (XEXP (exp, 0), code) | compute_alternative_mask (XEXP (exp, 1), code); else if (code == AND && GET_CODE (exp) == NOT && GET_CODE (XEXP (exp, 0)) == EQ_ATTR && XSTR (XEXP (exp, 0), 0) == alternative_name) string = XSTR (XEXP (exp, 0), 1); else if (code == IOR && GET_CODE (exp) == EQ_ATTR && XSTR (exp, 0) == alternative_name) string = XSTR (exp, 1); else return 0; if (string[1] == 0) return 1 << (string[0] - '0'); return 1 << atoi (string); } /* Given I, a single-bit mask, return RTX to compare the `alternative' attribute with the value represented by that bit. */ static rtx make_alternative_compare (mask) int mask; { rtx newexp; int i; char *alternative; /* Find the bit. */ for (i = 0; (mask & (1 << i)) == 0; i++) ; newexp = attr_rtx (EQ_ATTR, alternative_name, attr_numeral (i)); RTX_UNCHANGING_P (newexp) = 1; return newexp; } /* If we are processing an (eq_attr "attr" "value") test, we find the value of "attr" for this insn code. From that value, we can compute a test showing when the EQ_ATTR will be true. This routine performs that computation. If a test condition involves an address, we leave the EQ_ATTR intact because addresses are only valid for the `length' attribute. */ /* ??? Kenner, document the meanings of the arguments!!! */ static rtx evaluate_eq_attr (exp, value, insn_code, insn_index) rtx exp; rtx value; int insn_code, insn_index; { rtx orexp, andexp; rtx right; rtx newexp; int i; if (GET_CODE (value) == CONST_STRING) { if (! strcmp (XSTR (value, 0), XSTR (exp, 1))) newexp = true_rtx; else newexp = false_rtx; } else if (GET_CODE (value) == COND) { /* We construct an IOR of all the cases for which the requested attribute value is present. Since we start with FALSE, if it is not present, FALSE will be returned. Each case is the AND of the NOT's of the previous conditions with the current condition; in the default case the current condition is TRUE. For each possible COND value, call ourselves recursively. The extra TRUE and FALSE expressions will be eliminated by another call to the simplification routine. */ orexp = false_rtx; andexp = true_rtx; if (current_alternative_string) clear_struct_flag (value); for (i = 0; i < XVECLEN (value, 0); i += 2) { rtx this = SIMPLIFY_TEST_EXP (XVECEXP (value, 0, i), insn_code, insn_index); SIMPLIFY_ALTERNATIVE (this); right = insert_right_side (AND, andexp, this, insn_code, insn_index); right = insert_right_side (AND, right, evaluate_eq_attr (exp, XVECEXP (value, 0, i + 1), insn_code, insn_index), insn_code, insn_index); orexp = insert_right_side (IOR, orexp, right, insn_code, insn_index); /* Add this condition into the AND expression. */ newexp = attr_rtx (NOT, this); andexp = insert_right_side (AND, andexp, newexp, insn_code, insn_index); } /* Handle the default case. */ right = insert_right_side (AND, andexp, evaluate_eq_attr (exp, XEXP (value, 1), insn_code, insn_index), insn_code, insn_index); newexp = insert_right_side (IOR, orexp, right, insn_code, insn_index); } else abort (); /* If uses an address, must return original expression. But set the RTX_UNCHANGING_P bit so we don't try to simplify it again. */ address_used = 0; walk_attr_value (newexp); if (address_used) { /* This had `&& current_alternative_string', which seems to be wrong. */ if (! RTX_UNCHANGING_P (exp)) return copy_rtx_unchanging (exp); return exp; } else return newexp; } /* This routine is called when an AND of a term with a tree of AND's is encountered. If the term or its complement is present in the tree, it can be replaced with TRUE or FALSE, respectively. Note that (eq_attr "att" "v1") and (eq_attr "att" "v2") cannot both be true and hence are complementary. There is one special case: If we see (and (not (eq_attr "att" "v1")) (eq_attr "att" "v2")) this can be replaced by (eq_attr "att" "v2"). To do this we need to replace the term, not anything in the AND tree. So we pass a pointer to the term. */ static rtx simplify_and_tree (exp, pterm, insn_code, insn_index) rtx exp; rtx *pterm; int insn_code, insn_index; { rtx left, right; rtx newexp; rtx temp; int left_eliminates_term, right_eliminates_term; if (GET_CODE (exp) == AND) { left = simplify_and_tree (XEXP (exp, 0), pterm, insn_code, insn_index); right = simplify_and_tree (XEXP (exp, 1), pterm, insn_code, insn_index); if (left != XEXP (exp, 0) || right != XEXP (exp, 1)) { newexp = attr_rtx (GET_CODE (exp), left, right); exp = SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } } else if (GET_CODE (exp) == IOR) { /* For the IOR case, we do the same as above, except that we can only eliminate `term' if both sides of the IOR would do so. */ temp = *pterm; left = simplify_and_tree (XEXP (exp, 0), &temp, insn_code, insn_index); left_eliminates_term = (temp == true_rtx); temp = *pterm; right = simplify_and_tree (XEXP (exp, 1), &temp, insn_code, insn_index); right_eliminates_term = (temp == true_rtx); if (left_eliminates_term && right_eliminates_term) *pterm = true_rtx; if (left != XEXP (exp, 0) || right != XEXP (exp, 1)) { newexp = attr_rtx (GET_CODE (exp), left, right); exp = SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } } /* Check for simplifications. Do some extra checking here since this routine is called so many times. */ if (exp == *pterm) return true_rtx; else if (GET_CODE (exp) == NOT && XEXP (exp, 0) == *pterm) return false_rtx; else if (GET_CODE (*pterm) == NOT && exp == XEXP (*pterm, 0)) return false_rtx; else if (GET_CODE (exp) == EQ_ATTR && GET_CODE (*pterm) == EQ_ATTR) { if (XSTR (exp, 0) != XSTR (*pterm, 0)) return exp; if (! strcmp (XSTR (exp, 1), XSTR (*pterm, 1))) return true_rtx; else return false_rtx; } else if (GET_CODE (*pterm) == EQ_ATTR && GET_CODE (exp) == NOT && GET_CODE (XEXP (exp, 0)) == EQ_ATTR) { if (XSTR (*pterm, 0) != XSTR (XEXP (exp, 0), 0)) return exp; if (! strcmp (XSTR (*pterm, 1), XSTR (XEXP (exp, 0), 1))) return false_rtx; else return true_rtx; } else if (GET_CODE (exp) == EQ_ATTR && GET_CODE (*pterm) == NOT && GET_CODE (XEXP (*pterm, 0)) == EQ_ATTR) { if (XSTR (exp, 0) != XSTR (XEXP (*pterm, 0), 0)) return exp; if (! strcmp (XSTR (exp, 1), XSTR (XEXP (*pterm, 0), 1))) return false_rtx; else *pterm = true_rtx; } else if (GET_CODE (exp) == NOT && GET_CODE (*pterm) == NOT) { if (attr_equal_p (XEXP (exp, 0), XEXP (*pterm, 0))) return true_rtx; } else if (GET_CODE (exp) == NOT) { if (attr_equal_p (XEXP (exp, 0), *pterm)) return false_rtx; } else if (GET_CODE (*pterm) == NOT) { if (attr_equal_p (XEXP (*pterm, 0), exp)) return false_rtx; } else if (attr_equal_p (exp, *pterm)) return true_rtx; return exp; } /* Similar to `simplify_and_tree', but for IOR trees. */ static rtx simplify_or_tree (exp, pterm, insn_code, insn_index) rtx exp; rtx *pterm; int insn_code, insn_index; { rtx left, right; rtx newexp; rtx temp; int left_eliminates_term, right_eliminates_term; if (GET_CODE (exp) == IOR) { left = simplify_or_tree (XEXP (exp, 0), pterm, insn_code, insn_index); right = simplify_or_tree (XEXP (exp, 1), pterm, insn_code, insn_index); if (left != XEXP (exp, 0) || right != XEXP (exp, 1)) { newexp = attr_rtx (GET_CODE (exp), left, right); exp = SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } } else if (GET_CODE (exp) == AND) { /* For the AND case, we do the same as above, except that we can only eliminate `term' if both sides of the AND would do so. */ temp = *pterm; left = simplify_or_tree (XEXP (exp, 0), &temp, insn_code, insn_index); left_eliminates_term = (temp == false_rtx); temp = *pterm; right = simplify_or_tree (XEXP (exp, 1), &temp, insn_code, insn_index); right_eliminates_term = (temp == false_rtx); if (left_eliminates_term && right_eliminates_term) *pterm = false_rtx; if (left != XEXP (exp, 0) || right != XEXP (exp, 1)) { newexp = attr_rtx (GET_CODE (exp), left, right); exp = SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } } if (attr_equal_p (exp, *pterm)) return false_rtx; else if (GET_CODE (exp) == NOT && attr_equal_p (XEXP (exp, 0), *pterm)) return true_rtx; else if (GET_CODE (*pterm) == NOT && attr_equal_p (XEXP (*pterm, 0), exp)) return true_rtx; else if (GET_CODE (*pterm) == EQ_ATTR && GET_CODE (exp) == NOT && GET_CODE (XEXP (exp, 0)) == EQ_ATTR && XSTR (*pterm, 0) == XSTR (XEXP (exp, 0), 0)) *pterm = false_rtx; else if (GET_CODE (exp) == EQ_ATTR && GET_CODE (*pterm) == NOT && GET_CODE (XEXP (*pterm, 0)) == EQ_ATTR && XSTR (exp, 0) == XSTR (XEXP (*pterm, 0), 0)) return false_rtx; return exp; } /* Given an expression, see if it can be simplified for a particular insn code based on the values of other attributes being tested. This can eliminate nested get_attr_... calls. Note that if an endless recursion is specified in the patterns, the optimization will loop. However, it will do so in precisely the cases where an infinite recursion loop could occur during compilation. It's better that it occurs here! */ static rtx simplify_test_exp (exp, insn_code, insn_index) rtx exp; int insn_code, insn_index; { rtx left, right; struct attr_desc *attr; struct attr_value *av; struct insn_ent *ie; int i; rtx newexp = exp; char *spacer = (char *) obstack_finish (rtl_obstack); static rtx loser = 0; static int count = 0; static stopcount = 0; if (exp == loser) do_nothing (); count++; if (count == stopcount) do_nothing (); /* Don't re-simplify something we already simplified. */ if (RTX_UNCHANGING_P (exp) || MEM_IN_STRUCT_P (exp)) return exp; switch (GET_CODE (exp)) { case AND: left = SIMPLIFY_TEST_EXP (XEXP (exp, 0), insn_code, insn_index); SIMPLIFY_ALTERNATIVE (left); if (left == false_rtx) { obstack_free (rtl_obstack, spacer); return false_rtx; } right = SIMPLIFY_TEST_EXP (XEXP (exp, 1), insn_code, insn_index); SIMPLIFY_ALTERNATIVE (right); if (left == false_rtx) { obstack_free (rtl_obstack, spacer); return false_rtx; } /* If either side is an IOR and we have (eq_attr "alternative" ..") present on both sides, apply the distributive law since this will yield simplifications. */ if ((GET_CODE (left) == IOR || GET_CODE (right) == IOR) && compute_alternative_mask (left, IOR) && compute_alternative_mask (right, IOR)) { if (GET_CODE (left) == IOR) { rtx tem = left; left = right; right = tem; } newexp = attr_rtx (IOR, attr_rtx (AND, left, XEXP (right, 0)), attr_rtx (AND, left, XEXP (right, 1))); return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } /* Try with the term on both sides. */ right = simplify_and_tree (right, &left, insn_code, insn_index); if (left == XEXP (exp, 0) && right == XEXP (exp, 1)) left = simplify_and_tree (left, &right, insn_code, insn_index); if (left == false_rtx || right == false_rtx) { obstack_free (rtl_obstack, spacer); return false_rtx; } else if (left == true_rtx) { return right; } else if (right == true_rtx) { return left; } /* See if all or all but one of the insn's alternatives are specified in this tree. Optimize if so. */ else if (insn_code >= 0 && (GET_CODE (left) == AND || (GET_CODE (left) == NOT && GET_CODE (XEXP (left, 0)) == EQ_ATTR && XSTR (XEXP (left, 0), 0) == alternative_name) || GET_CODE (right) == AND || (GET_CODE (right) == NOT && GET_CODE (XEXP (right, 0)) == EQ_ATTR && XSTR (XEXP (right, 0), 0) == alternative_name))) { i = compute_alternative_mask (exp, AND); if (i & ~insn_alternatives[insn_code]) fatal ("Illegal alternative specified for pattern number %d", insn_index); /* If all alternatives are excluded, this is false. */ i ^= insn_alternatives[insn_code]; if (i == 0) return false_rtx; else if ((i & (i - 1)) == 0 && insn_alternatives[insn_code] > 1) { /* If just one excluded, AND a comparison with that one to the front of the tree. The others will be eliminated by optimization. We do not want to do this if the insn has one alternative and we have tested none of them! */ left = make_alternative_compare (i); right = simplify_and_tree (exp, &left, insn_code, insn_index); newexp = attr_rtx (AND, left, right); return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } } if (left != XEXP (exp, 0) || right != XEXP (exp, 1)) { newexp = attr_rtx (AND, left, right); return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } break; case IOR: left = SIMPLIFY_TEST_EXP (XEXP (exp, 0), insn_code, insn_index); SIMPLIFY_ALTERNATIVE (left); if (left == true_rtx) { obstack_free (rtl_obstack, spacer); return true_rtx; } right = SIMPLIFY_TEST_EXP (XEXP (exp, 1), insn_code, insn_index); SIMPLIFY_ALTERNATIVE (right); if (right == true_rtx) { obstack_free (rtl_obstack, spacer); return true_rtx; } right = simplify_or_tree (right, &left, insn_code, insn_index); if (left == XEXP (exp, 0) && right == XEXP (exp, 1)) left = simplify_or_tree (left, &right, insn_code, insn_index); if (right == true_rtx || left == true_rtx) { obstack_free (rtl_obstack, spacer); return true_rtx; } else if (left == false_rtx) { return right; } else if (right == false_rtx) { return left; } /* Test for simple cases where the distributive law is useful. I.e., convert (ior (and (x) (y)) (and (x) (z))) to (and (x) (ior (y) (z))) */ else if (GET_CODE (left) == AND && GET_CODE (right) == AND && attr_equal_p (XEXP (left, 0), XEXP (right, 0))) { newexp = attr_rtx (IOR, XEXP (left, 1), XEXP (right, 1)); left = XEXP (left, 0); right = newexp; newexp = attr_rtx (AND, left, right); return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } /* See if all or all but one of the insn's alternatives are specified in this tree. Optimize if so. */ else if (insn_code >= 0 && (GET_CODE (left) == IOR || (GET_CODE (left) == EQ_ATTR && XSTR (left, 0) == alternative_name) || GET_CODE (right) == IOR || (GET_CODE (right) == EQ_ATTR && XSTR (right, 0) == alternative_name))) { i = compute_alternative_mask (exp, IOR); if (i & ~insn_alternatives[insn_code]) fatal ("Illegal alternative specified for pattern number %d", insn_index); /* If all alternatives are included, this is true. */ i ^= insn_alternatives[insn_code]; if (i == 0) return true_rtx; else if ((i & (i - 1)) == 0 && insn_alternatives[insn_code] > 1) { /* If just one excluded, IOR a comparison with that one to the front of the tree. The others will be eliminated by optimization. We do not want to do this if the insn has one alternative and we have tested none of them! */ left = make_alternative_compare (i); right = simplify_and_tree (exp, &left, insn_code, insn_index); newexp = attr_rtx (IOR, attr_rtx (NOT, left), right); return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } } if (left != XEXP (exp, 0) || right != XEXP (exp, 1)) { newexp = attr_rtx (IOR, left, right); return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } break; case NOT: if (GET_CODE (XEXP (exp, 0)) == NOT) { left = SIMPLIFY_TEST_EXP (XEXP (XEXP (exp, 0), 0), insn_code, insn_index); SIMPLIFY_ALTERNATIVE (left); return left; } left = SIMPLIFY_TEST_EXP (XEXP (exp, 0), insn_code, insn_index); SIMPLIFY_ALTERNATIVE (left); if (GET_CODE (left) == NOT) return XEXP (left, 0); if (left == false_rtx) { obstack_free (rtl_obstack, spacer); return true_rtx; } else if (left == true_rtx) { obstack_free (rtl_obstack, spacer); return false_rtx; } /* Try to apply De`Morgan's laws. */ else if (GET_CODE (left) == IOR) { newexp = attr_rtx (AND, attr_rtx (NOT, XEXP (left, 0)), attr_rtx (NOT, XEXP (left, 1))); newexp = SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } else if (GET_CODE (left) == AND) { newexp = attr_rtx (IOR, attr_rtx (NOT, XEXP (left, 0)), attr_rtx (NOT, XEXP (left, 1))); newexp = SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index); } else if (left != XEXP (exp, 0)) { newexp = attr_rtx (NOT, left); } break; case EQ_ATTR: if (current_alternative_string && XSTR (exp, 0) == alternative_name) return (XSTR (exp, 1) == current_alternative_string ? true_rtx : false_rtx); /* Look at the value for this insn code in the specified attribute. We normally can replace this comparison with the condition that would give this insn the values being tested for. */ if (XSTR (exp, 0) != alternative_name && (attr = find_attr (XSTR (exp, 0), 0)) != NULL) for (av = attr->first_value; av; av = av->next) for (ie = av->first_insn; ie; ie = ie->next) if (ie->insn_code == insn_code) return evaluate_eq_attr (exp, av->value, insn_code, insn_index); } /* We have already simplified this expression. Simplifying it again won't buy anything unless we weren't given a valid insn code to process (i.e., we are canonicalizing something.). */ if (insn_code != -2 /* Seems wrong: && current_alternative_string. */ && ! RTX_UNCHANGING_P (newexp)) return copy_rtx_unchanging (newexp); return newexp; } do_nothing () {} /* Optimize the attribute lists by seeing if we can determine conditional values from the known values of other attributes. This will save subroutine calls during the compilation. */ static void optimize_attrs () { struct attr_desc *attr; struct attr_value *av; struct insn_ent *ie, *nextie; rtx newexp; int something_changed = 1; int i; struct attr_value_list { struct attr_value *av; struct insn_ent *ie; struct attr_desc * attr; struct attr_value_list *next; }; struct attr_value_list **insn_code_values; struct attr_value_list *iv; /* For each insn code, make a list of all the insn_ent's for it, for all values for all attributes. */ /* Make 2 extra elements, for "code" values -2 and -1. */ insn_code_values = (struct attr_value_list **) alloca ((insn_code_number + 2) * sizeof (struct attr_value_list *)); bzero (insn_code_values, (insn_code_number + 2) * sizeof (struct attr_value_list *)); /* Offset the table address so we can index by -2 or -1. */ insn_code_values += 2; for (i = 0; i < MAX_ATTRS_INDEX; i++) for (attr = attrs[i]; attr; attr = attr->next) for (av = attr->first_value; av; av = av->next) for (ie = av->first_insn; ie; ie = ie->next) { iv = ((struct attr_value_list *) alloca (sizeof (struct attr_value_list))); iv->attr = attr; iv->av = av; iv->ie = ie; iv->next = insn_code_values[ie->insn_code]; insn_code_values[ie->insn_code] = iv; } /* Process one insn code at a time. */ for (i = -2; i < insn_code_number; i++) { /* Clear the MEM_IN_STRUCT_P flag everywhere relevant. We use it to mean "already simplified for this insn". */ for (iv = insn_code_values[i]; iv; iv = iv->next) clear_struct_flag (iv->av->value); /* Loop until nothing changes for one iteration. */ something_changed = 1; while (something_changed) { something_changed = 0; for (iv = insn_code_values[i]; iv; iv = iv->next) { struct obstack *old = rtl_obstack; char *spacer = (char *) obstack_finish (temp_obstack); attr = iv->attr; av = iv->av; ie = iv->ie; if (GET_CODE (av->value) != COND) continue; rtl_obstack = temp_obstack; #if 0 /* This was intended as a speed up, but it was slower. */ if (insn_n_alternatives[ie->insn_code] > 6 && count_sub_rtxs (av->value, 200) >= 200) newexp = simplify_by_alternatives (av->value, ie->insn_code, ie->insn_index); else #endif newexp = simplify_cond (av->value, ie->insn_code, ie->insn_index); rtl_obstack = old; if (newexp != av->value) { newexp = attr_copy_rtx (newexp); remove_insn_ent (av, ie); av = get_attr_value (newexp, attr, ie->insn_code); iv->av = av; insert_insn_ent (av, ie); something_changed = 1; } obstack_free (temp_obstack, spacer); } } } } static rtx simplify_by_alternatives (exp, insn_code, insn_index) rtx exp; int insn_code, insn_index; { int i; int len = insn_n_alternatives[insn_code]; rtx newexp = rtx_alloc (COND); rtx ultimate; XVEC (newexp, 0) = rtvec_alloc (len * 2); /* It will not matter what value we use as the default value of the new COND, since that default will never be used. Choose something of the right type. */ for (ultimate = exp; GET_CODE (ultimate) == COND;) ultimate = XEXP (ultimate, 1); XEXP (newexp, 1) = ultimate; for (i = 0; i < insn_n_alternatives[insn_code]; i++) { current_alternative_string = attr_numeral (i); XVECEXP (newexp, 0, i * 2) = make_alternative_compare (1 << i); XVECEXP (newexp, 0, i * 2 + 1) = simplify_cond (exp, insn_code, insn_index); } current_alternative_string = 0; return simplify_cond (newexp, insn_code, insn_index); } /* Clear the MEM_IN_STRUCT_P flag in EXP and its subexpressions. */ clear_struct_flag (x) rtx x; { register int i; register int j; register enum rtx_code code; register char *fmt; MEM_IN_STRUCT_P (x) = 0; if (RTX_UNCHANGING_P (x)) return; code = GET_CODE (x); switch (code) { case REG: case QUEUED: case CONST_INT: case CONST_DOUBLE: case SYMBOL_REF: case CODE_LABEL: case PC: case CC0: case EQ_ATTR: return; } /* Compare the elements. If any pair of corresponding elements fail to match, return 0 for the whole things. */ fmt = GET_RTX_FORMAT (code); for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) { switch (fmt[i]) { case 'V': case 'E': for (j = 0; j < XVECLEN (x, i); j++) clear_struct_flag (XVECEXP (x, i, j)); break; case 'e': clear_struct_flag (XEXP (x, i)); break; } } } /* Return the number of RTX objects making up the expression X. But if we count more more than MAX objects, stop counting. */ count_sub_rtxs (x, max) rtx x; int max; { register int i; register int j; register enum rtx_code code; register char *fmt; int total = 0; code = GET_CODE (x); switch (code) { case REG: case QUEUED: case CONST_INT: case CONST_DOUBLE: case SYMBOL_REF: case CODE_LABEL: case PC: case CC0: case EQ_ATTR: return 1; } /* Compare the elements. If any pair of corresponding elements fail to match, return 0 for the whole things. */ fmt = GET_RTX_FORMAT (code); for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) { if (total >= max) return total; switch (fmt[i]) { case 'V': case 'E': for (j = 0; j < XVECLEN (x, i); j++) total += count_sub_rtxs (XVECEXP (x, i, j), max); break; case 'e': total += count_sub_rtxs (XEXP (x, i), max); break; } } return total; } /* Create table entries for DEFINE_ATTR. */ static void gen_attr (exp) rtx exp; { struct attr_desc *attr; struct attr_value *av; char *name_ptr; char *p; /* Make a new attribute structure. Check for duplicate by looking at attr->default_val, since it is initialized by this routine. */ attr = find_attr (XSTR (exp, 0), 1); if (attr->default_val) fatal ("Duplicate definition for `%s' attribute", attr->name); if (*XSTR (exp, 1) == '\0') attr->is_numeric = 1; else { name_ptr = XSTR (exp, 1); while ((p = next_comma_elt (&name_ptr)) != NULL) { av = (struct attr_value *) xmalloc (sizeof (struct attr_value)); av->value = attr_rtx (CONST_STRING, p); av->next = attr->first_value; attr->first_value = av; av->first_insn = NULL; av->num_insns = 0; av->has_asm_insn = 0; } } if (GET_CODE (XEXP (exp, 2)) == CONST) { attr->is_const = 1; if (attr->is_numeric) fatal ("Constant attributes may not take numeric values"); /* Get rid of the CONST node. It is allowed only at top-level. */ XEXP (exp, 2) = XEXP (XEXP (exp, 2), 0); } if (! strcmp (attr->name, "length") && ! attr->is_numeric) fatal ("`length' attribute must take numeric values"); /* Set up the default value. */ XEXP (exp, 2) = check_attr_value (XEXP (exp, 2), attr); attr->default_val = get_attr_value (XEXP (exp, 2), attr, -2); } /* Given a pattern for DEFINE_PEEPHOLE or DEFINE_INSN, return the number of alternatives in the constraints. Assume all MATCH_OPERANDs have the same number of alternatives as this should be checked elsewhere. */ static int count_alternatives (exp) rtx exp; { int i, j, n; char *fmt; if (GET_CODE (exp) == MATCH_OPERAND) return n_comma_elts (XSTR (exp, 2)); for (i = 0, fmt = GET_RTX_FORMAT (GET_CODE (exp)); i < GET_RTX_LENGTH (GET_CODE (exp)); i++) switch (*fmt++) { case 'e': case 'u': n = count_alternatives (XEXP (exp, i)); if (n) return n; break; case 'E': case 'V': if (XVEC (exp, i) != NULL) for (j = 0; j < XVECLEN (exp, i); j++) { n = count_alternatives (XVECEXP (exp, i, j)); if (n) return n; } } return 0; } /* Returns non-zero if the given expression contains an EQ_ATTR with the `alternative' attribute. */ static int compares_alternatives_p (exp) rtx exp; { int i, j; char *fmt; if (GET_CODE (exp) == EQ_ATTR && XSTR (exp, 0) == alternative_name) return 1; for (i = 0, fmt = GET_RTX_FORMAT (GET_CODE (exp)); i < GET_RTX_LENGTH (GET_CODE (exp)); i++) switch (*fmt++) { case 'e': case 'u': if (compares_alternatives_p (XEXP (exp, i))) return 1; break; case 'E': for (j = 0; j < XVECLEN (exp, i); j++) if (compares_alternatives_p (XVECEXP (exp, i, j))) return 1; break; } return 0; } /* Returns non-zero is INNER is contained in EXP. */ static int contained_in_p (inner, exp) rtx inner; rtx exp; { int i, j; char *fmt; if (rtx_equal_p (inner, exp)) return 1; for (i = 0, fmt = GET_RTX_FORMAT (GET_CODE (exp)); i < GET_RTX_LENGTH (GET_CODE (exp)); i++) switch (*fmt++) { case 'e': case 'u': if (contained_in_p (inner, XEXP (exp, i))) return 1; break; case 'E': for (j = 0; j < XVECLEN (exp, i); j++) if (contained_in_p (inner, XVECEXP (exp, i, j))) return 1; break; } return 0; } /* Process DEFINE_PEEPHOLE, DEFINE_INSN, and DEFINE_ASM_ATTRIBUTES. */ static void gen_insn (exp) rtx exp; { struct insn_def *id; id = (struct insn_def *) xmalloc (sizeof (struct insn_def)); id->next = defs; defs = id; id->def = exp; switch (GET_CODE (exp)) { case DEFINE_INSN: id->insn_code = insn_code_number++; id->insn_index = insn_index_number++; id->num_alternatives = count_alternatives (exp); if (id->num_alternatives == 0) id->num_alternatives = 1; id->vec_idx = 4; break; case DEFINE_PEEPHOLE: id->insn_code = insn_code_number++; id->insn_index = insn_index_number++; id->num_alternatives = count_alternatives (exp); if (id->num_alternatives == 0) id->num_alternatives = 1; id->vec_idx = 3; break; case DEFINE_ASM_ATTRIBUTES: id->insn_code = -1; id->insn_index = -1; id->num_alternatives = 1; id->vec_idx = 0; got_define_asm_attributes = 1; break; } } /* Process a DEFINE_DELAY. Validate the vector length, check if annul true or annul false is specified, and make a `struct delay_desc'. */ static void gen_delay (def) rtx def; { struct delay_desc *delay; int i; if (XVECLEN (def, 1) % 3 != 0) fatal ("Number of elements in DEFINE_DELAY must be multiple of three."); for (i = 0; i < XVECLEN (def, 1); i += 3) { if (XVECEXP (def, 1, i + 1)) have_annul_true = 1; if (XVECEXP (def, 1, i + 2)) have_annul_false = 1; } delay = (struct delay_desc *) xmalloc (sizeof (struct delay_desc)); delay->def = def; delay->num = ++num_delays; delay->next = delays; delays = delay; } /* Process a DEFINE_FUNCTION_UNIT. This gives information about a function unit contained in the CPU. We fill in a `struct function_unit_op' and a `struct function_unit' with information used later by `expand_unit'. */ static void gen_unit (def) rtx def; { struct function_unit *unit; struct function_unit_op *op; /* See if we have already seen this function unit. If so, check that the multiplicity and simultaneity values are the same. If not, make a structure for this function unit. */ for (unit = units; unit; unit = unit->next) if (! strcmp (unit->name, XSTR (def, 0))) { if (unit->multiplicity != XINT (def, 1) || unit->simultaneity != XINT (def, 2)) fatal ("Differing specifications given for `%s' function unit.", unit->name); break; } if (unit == 0) { unit = (struct function_unit *) xmalloc (sizeof (struct function_unit)); unit->name = XSTR (def, 0); unit->multiplicity = XINT (def, 1); unit->simultaneity = XINT (def, 2); unit->num = num_units++; unit->num_opclasses = 0; unit->condexp = false_rtx; unit->ops = 0; unit->next = units; units = unit; } /* Make a new operation class structure entry and initialize it. */ op = (struct function_unit_op *) xmalloc (sizeof (struct function_unit_op)); op->condexp = XEXP (def, 3); op->num = unit->num_opclasses++; op->ready = XINT (def, 4); op->next = unit->ops; unit->ops = op; /* Set our busy expression based on whether or not an optional conflict vector was specified. */ if (XVEC (def, 6)) { /* Compute the IOR of all the specified expressions. */ rtx orexp = false_rtx; int i; for (i = 0; i < XVECLEN (def, 6); i++) orexp = insert_right_side (IOR, orexp, XVECEXP (def, 6, i), -2); op->busyexp = attr_rtx (IF_THEN_ELSE, orexp, make_numeric_value (XINT (def, 5)), make_numeric_value (0)); } else op->busyexp = make_numeric_value (XINT (def, 5)); /* Merge our conditional into that of the function unit so we can determine which insns are used by the function unit. */ unit->condexp = insert_right_side (IOR, unit->condexp, op->condexp, -2); } /* Given a piece of RTX, print a C expression to test it's truth value. We use AND and IOR both for logical and bit-wise operations, so interpret them as logical unless they are inside a comparison expression. The second operand of this function will be non-zero in that case. */ static void write_test_expr (exp, in_comparison) rtx exp; int in_comparison; { int comparison_operator = 0; RTX_CODE code; struct attr_desc *attr; /* In order not to worry about operator precedence, surround our part of the expression with parentheses. */ printf ("("); code = GET_CODE (exp); switch (code) { /* Binary operators. */ case EQ: case NE: case GE: case GT: case GEU: case GTU: case LE: case LT: case LEU: case LTU: comparison_operator = 1; case PLUS: case MINUS: case MULT: case DIV: case MOD: case AND: case IOR: case XOR: case LSHIFT: case ASHIFT: case LSHIFTRT: case ASHIFTRT: write_test_expr (XEXP (exp, 0), in_comparison || comparison_operator); switch (code) { case EQ: printf (" == "); break; case NE: printf (" != "); break; case GE: printf (" >= "); break; case GT: printf (" > "); break; case GEU: printf (" >= (unsigned) "); break; case GTU: printf (" > (unsigned) "); break; case LE: printf (" <= "); break; case LT: printf (" < "); break; case LEU: printf (" <= (unsigned) "); break; case LTU: printf (" < (unsigned) "); break; case PLUS: printf (" + "); break; case MINUS: printf (" - "); break; case MULT: printf (" * "); break; case DIV: printf (" / "); break; case MOD: printf (" %% "); break; case AND: if (in_comparison) printf (" & "); else printf (" && "); break; case IOR: if (in_comparison) printf (" | "); else printf (" || "); break; case XOR: printf (" ^ "); break; case LSHIFT: case ASHIFT: printf (" << "); break; case LSHIFTRT: case ASHIFTRT: printf (" >> "); break; } write_test_expr (XEXP (exp, 1), in_comparison || comparison_operator); break; case NOT: /* Special-case (not (eq_attrq "alternative" "x")) */ if (! in_comparison && GET_CODE (XEXP (exp, 0)) == EQ_ATTR && XSTR (XEXP (exp, 0), 0) == alternative_name) { printf ("which_alternative != %s", XSTR (XEXP (exp, 0), 1)); break; } /* Otherwise, fall through to normal unary operator. */ /* Unary operators. */ case ABS: case NEG: switch (code) { case NOT: if (in_comparison) printf ("~ "); else printf ("! "); break; case ABS: printf ("abs "); break; case NEG: printf ("-"); break; } write_test_expr (XEXP (exp, 0), in_comparison); break; /* Comparison test of an attribute with a value. Most of these will have been removed by optimization. Handle "alternative" specially and give error if EQ_ATTR present inside a comparison. */ case EQ_ATTR: if (in_comparison) fatal ("EQ_ATTR not valid inside comparison"); if (XSTR (exp, 0) == alternative_name) { printf ("which_alternative == %s", XSTR (exp, 1)); break; } attr = find_attr (XSTR (exp, 0), 0); if (! attr) abort (); /* Now is the time to expand the value of a constant attribute. */ if (attr->is_const) { write_test_expr (evaluate_eq_attr (exp, attr->default_val->value, 0, 0), in_comparison); } else { printf ("get_attr_%s (insn) == ", attr->name); write_attr_valueq (attr, XSTR (exp, 1)); } break; /* See if an operand matches a predicate. */ case MATCH_OPERAND: /* If only a mode is given, just ensure the mode matches the operand. If neither a mode nor predicate is given, error. */ if (XSTR (exp, 1) == NULL || *XSTR (exp, 1) == '\0') { if (GET_MODE (exp) == VOIDmode) fatal ("Null MATCH_OPERAND specified as test"); else printf ("GET_MODE (operands[%d]) == %smode", XINT (exp, 0), GET_MODE_NAME (GET_MODE (exp))); } else printf ("%s (operands[%d], %smode)", XSTR (exp, 1), XINT (exp, 0), GET_MODE_NAME (GET_MODE (exp))); break; /* Constant integer. */ case CONST_INT: #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT printf ("%d", XWINT (exp, 0)); #else printf ("%ld", XWINT (exp, 0)); #endif break; /* A random C expression. */ case SYMBOL_REF: printf ("%s", XSTR (exp, 0)); break; /* The address of the branch target. */ case MATCH_DUP: printf ("insn_addresses[INSN_UID (JUMP_LABEL (insn))]"); break; /* The address of the current insn. It would be more consistent with other usage to make this the address of the NEXT insn, but this gets too confusing because of the ambiguity regarding the length of the current insn. */ case PC: printf ("insn_current_address"); break; default: fatal ("bad RTX code `%s' in attribute calculation\n", GET_RTX_NAME (code)); } printf (")"); } /* Given an attribute value, return the maximum CONST_STRING argument encountered. It is assumed that they are all numeric. */ static int max_attr_value (exp) rtx exp; { int current_max = 0; int n; int i; if (GET_CODE (exp) == CONST_STRING) return atoi (XSTR (exp, 0)); else if (GET_CODE (exp) == COND) { for (i = 0; i < XVECLEN (exp, 0); i += 2) { n = max_attr_value (XVECEXP (exp, 0, i + 1)); if (n > current_max) current_max = n; } n = max_attr_value (XEXP (exp, 1)); if (n > current_max) current_max = n; } else abort (); return current_max; } /* Scan an attribute value, possibly a conditional, and record what actions will be required to do any conditional tests in it. Specifically, set `must_extract' if we need to extract the insn operands `must_constrain' if we must compute `which_alternative' `address_used' if an address expression was used */ static void walk_attr_value (exp) rtx exp; { register int i, j; register char *fmt; RTX_CODE code; if (exp == NULL) return; code = GET_CODE (exp); switch (code) { case SYMBOL_REF: if (! RTX_UNCHANGING_P (exp)) /* Since this is an arbitrary expression, it can look at anything. However, constant expressions do not depend on any particular insn. */ must_extract = must_constrain = 1; return; case MATCH_OPERAND: must_extract = 1; return; case EQ_ATTR: if (XSTR (exp, 0) == alternative_name) must_extract = must_constrain = 1; return; case MATCH_DUP: case PC: address_used = 1; return; } for (i = 0, fmt = GET_RTX_FORMAT (code); i < GET_RTX_LENGTH (code); i++) switch (*fmt++) { case 'e': case 'u': walk_attr_value (XEXP (exp, i)); break; case 'E': if (XVEC (exp, i) != NULL) for (j = 0; j < XVECLEN (exp, i); j++) walk_attr_value (XVECEXP (exp, i, j)); break; } } /* Write out a function to obtain the attribute for a given INSN. */ static void write_attr_get (attr) struct attr_desc *attr; { struct attr_value *av, *common_av; /* Find the most used attribute value. Handle that as the `default' of the switch we will generate. */ common_av = find_most_used (attr); /* Write out start of function, then all values with explicit `case' lines, then a `default', then the value with the most uses. */ if (attr->is_numeric) printf ("int\n"); else printf ("enum attr_%s\n", attr->name); /* If the attribute name starts with a star, the remainder is the name of the subroutine to use, instead of `get_attr_...'. */ if (attr->name[0] == '*') printf ("%s (insn)\n", &attr->name[1]); else if (attr->is_const == 0) printf ("get_attr_%s (insn)\n", attr->name); else { printf ("get_attr_%s ()\n", attr->name); printf ("{\n"); for (av = attr->first_value; av; av = av->next) if (av->num_insns != 0) write_attr_set (attr, 2, av->value, "return", ";", true_rtx, av->first_insn->insn_code, av->first_insn->insn_index); printf ("}\n\n"); return; } printf (" rtx insn;\n"); printf ("{\n"); printf (" switch (recog_memoized (insn))\n"); printf (" {\n"); for (av = attr->first_value; av; av = av->next) if (av != common_av) write_attr_case (attr, av, 1, "return", ";", 4, true_rtx); write_attr_case (attr, common_av, 0, "return", ";", 4, true_rtx); printf (" }\n}\n\n"); } /* Given an AND tree of known true terms (because we are inside an `if' with that as the condition or are in an `else' clause) and an expression, replace any known true terms with TRUE. Use `simplify_and_tree' to do the bulk of the work. */ static rtx eliminate_known_true (known_true, exp, insn_code, insn_index) rtx known_true; rtx exp; int insn_code, insn_index; { rtx term; known_true = SIMPLIFY_TEST_EXP (known_true, insn_code, insn_index); if (GET_CODE (known_true) == AND) { exp = eliminate_known_true (XEXP (known_true, 0), exp, insn_code, insn_index); exp = eliminate_known_true (XEXP (known_true, 1), exp, insn_code, insn_index); } else { term = known_true; exp = simplify_and_tree (exp, &term, insn_code, insn_index); } return exp; } /* Write out a series of tests and assignment statements to perform tests and sets of an attribute value. We are passed an indentation amount and prefix and suffix strings to write around each attribute value (e.g., "return" and ";"). */ static void write_attr_set (attr, indent, value, prefix, suffix, known_true, insn_code, insn_index) struct attr_desc *attr; int indent; rtx value; char *prefix; char *suffix; rtx known_true; int insn_code, insn_index; { if (GET_CODE (value) == CONST_STRING) { write_indent (indent); printf ("%s ", prefix); write_attr_value (attr, value); printf ("%s\n", suffix); } else if (GET_CODE (value) == COND) { /* Assume the default value will be the default of the COND unless we find an always true expression. */ rtx default_val = XEXP (value, 1); rtx our_known_true = known_true; rtx newexp; int first_if = 1; int i; for (i = 0; i < XVECLEN (value, 0); i += 2) { rtx testexp; rtx inner_true; testexp = eliminate_known_true (our_known_true, XVECEXP (value, 0, i), insn_code, insn_index); newexp = attr_rtx (NOT, testexp); newexp = insert_right_side (AND, our_known_true, newexp, insn_code, insn_index); /* If the test expression is always true or if the next `known_true' expression is always false, this is the last case, so break out and let this value be the `else' case. */ if (testexp == true_rtx || newexp == false_rtx) { default_val = XVECEXP (value, 0, i + 1); break; } /* Compute the expression to pass to our recursive call as being known true. */ inner_true = insert_right_side (AND, our_known_true, testexp, insn_code, insn_index); /* If this is always false, skip it. */ if (inner_true == false_rtx) continue; write_indent (indent); printf ("%sif ", first_if ? "" : "else "); first_if = 0; write_test_expr (testexp, 0); printf ("\n"); write_indent (indent + 2); printf ("{\n"); write_attr_set (attr, indent + 4, XVECEXP (value, 0, i + 1), prefix, suffix, inner_true, insn_code, insn_index); write_indent (indent + 2); printf ("}\n"); our_known_true = newexp; } if (! first_if) { write_indent (indent); printf ("else\n"); write_indent (indent + 2); printf ("{\n"); } write_attr_set (attr, first_if ? indent : indent + 4, default_val, prefix, suffix, our_known_true, insn_code, insn_index); if (! first_if) { write_indent (indent + 2); printf ("}\n"); } } else abort (); } /* Write out the computation for one attribute value. */ static void write_attr_case (attr, av, write_case_lines, prefix, suffix, indent, known_true) struct attr_desc *attr; struct attr_value *av; int write_case_lines; char *prefix, *suffix; int indent; rtx known_true; { struct insn_ent *ie; if (av->num_insns == 0) return; if (av->has_asm_insn) { write_indent (indent); printf ("case -1:\n"); write_indent (indent + 2); printf ("if (GET_CODE (PATTERN (insn)) != ASM_INPUT\n"); write_indent (indent + 2); printf (" && asm_noperands (PATTERN (insn)) < 0)\n"); write_indent (indent + 2); printf (" fatal_insn_not_found (insn);\n"); } if (write_case_lines) { for (ie = av->first_insn; ie; ie = ie->next) if (ie->insn_code != -1) { write_indent (indent); printf ("case %d:\n", ie->insn_code); } } else { write_indent (indent); printf ("default:\n"); } /* See what we have to do to handle output this value. */ must_extract = must_constrain = address_used = 0; walk_attr_value (av->value); if (must_extract) { write_indent (indent + 2); printf ("insn_extract (insn);\n"); } if (must_constrain) { #ifdef REGISTER_CONSTRAINTS write_indent (indent + 2); printf ("if (! constrain_operands (INSN_CODE (insn), reload_completed))\n"); write_indent (indent + 2); printf (" fatal_insn_not_found (insn);\n"); #endif } write_attr_set (attr, indent + 2, av->value, prefix, suffix, known_true, av->first_insn->insn_code, av->first_insn->insn_index); if (strncmp (prefix, "return", 6)) { write_indent (indent + 2); printf ("break;\n"); } printf ("\n"); } /* Utilities to write names in various forms. */ static void write_attr_valueq (attr, s) struct attr_desc *attr; char *s; { if (attr->is_numeric) printf ("%s", s); else { write_upcase (attr->name); printf ("_"); write_upcase (s); } } static void write_attr_value (attr, value) struct attr_desc *attr; rtx value; { if (GET_CODE (value) != CONST_STRING) abort (); write_attr_valueq (attr, XSTR (value, 0)); } static void write_upcase (str) char *str; { while (*str) if (*str < 'a' || *str > 'z') printf ("%c", *str++); else printf ("%c", *str++ - 'a' + 'A'); } static void write_indent (indent) int indent; { for (; indent > 8; indent -= 8) printf ("\t"); for (; indent; indent--) printf (" "); } /* Write a subroutine that is given an insn that requires a delay slot, a delay slot ordinal, and a candidate insn. It returns non-zero if the candidate can be placed in the specified delay slot of the insn. We can write as many as three subroutines. `eligible_for_delay' handles normal delay slots, `eligible_for_annul_true' indicates that the specified insn can be annulled if the branch is true, and likewise for `eligible_for_annul_false'. KIND is a string distinguishing these three cases ("delay", "annul_true", or "annul_false"). */ static void write_eligible_delay (kind) char *kind; { struct delay_desc *delay; int max_slots; char str[50]; struct attr_desc *attr; struct attr_value *av, *common_av; int i; /* Compute the maximum number of delay slots required. We use the delay ordinal times this number plus one, plus the slot number as an index into the appropriate predicate to test. */ for (delay = delays, max_slots = 0; delay; delay = delay->next) if (XVECLEN (delay->def, 1) / 3 > max_slots) max_slots = XVECLEN (delay->def, 1) / 3; /* Write function prelude. */ printf ("int\n"); printf ("eligible_for_%s (delay_insn, slot, candidate_insn)\n", kind); printf (" rtx delay_insn;\n"); printf (" int slot;\n"); printf (" rtx candidate_insn;\n"); printf ("{\n"); printf (" rtx insn;\n"); printf ("\n"); printf (" if (slot >= %d)\n", max_slots); printf (" abort ();\n"); printf ("\n"); /* If more than one delay type, find out which type the delay insn is. */ if (num_delays > 1) { attr = find_attr ("*delay_type", 0); if (! attr) abort (); common_av = find_most_used (attr); printf (" insn = delay_insn;\n"); printf (" switch (recog_memoized (insn))\n"); printf (" {\n"); sprintf (str, " * %d;\n break;", max_slots); for (av = attr->first_value; av; av = av->next) if (av != common_av) write_attr_case (attr, av, 1, "slot +=", str, 4, true_rtx); write_attr_case (attr, common_av, 0, "slot +=", str, 4, true_rtx); printf (" }\n\n"); /* Ensure matched. Otherwise, shouldn't have been called. */ printf (" if (slot < %d)\n", max_slots); printf (" abort ();\n\n"); } /* If just one type of delay slot, write simple switch. */ if (num_delays == 1 && max_slots == 1) { printf (" insn = candidate_insn;\n"); printf (" switch (recog_memoized (insn))\n"); printf (" {\n"); attr = find_attr ("*delay_1_0", 0); if (! attr) abort (); common_av = find_most_used (attr); for (av = attr->first_value; av; av = av->next) if (av != common_av) write_attr_case (attr, av, 1, "return", ";", 4, true_rtx); write_attr_case (attr, common_av, 0, "return", ";", 4, true_rtx); printf (" }\n"); } else { /* Write a nested CASE. The first indicates which condition we need to test, and the inner CASE tests the condition. */ printf (" insn = candidate_insn;\n"); printf (" switch (slot)\n"); printf (" {\n"); for (delay = delays; delay; delay = delay->next) for (i = 0; i < XVECLEN (delay->def, 1); i += 3) { printf (" case %d:\n", (i / 3) + (num_delays == 1 ? 0 : delay->num * max_slots)); printf (" switch (recog_memoized (insn))\n"); printf ("\t{\n"); sprintf (str, "*%s_%d_%d", kind, delay->num, i / 3); attr = find_attr (str, 0); if (! attr) abort (); common_av = find_most_used (attr); for (av = attr->first_value; av; av = av->next) if (av != common_av) write_attr_case (attr, av, 1, "return", ";", 8, true_rtx); write_attr_case (attr, common_av, 0, "return", ";", 8, true_rtx); printf (" }\n"); } printf (" default:\n"); printf (" abort ();\n"); printf (" }\n"); } printf ("}\n\n"); } /* Write routines to compute conflict cost for function units. Then write a table describing the available function units. */ static void write_function_unit_info () { struct function_unit *unit; struct attr_desc *case_attr, *attr; struct attr_value *av, *common_av; rtx value; char *str; int using_case; int i; /* Write out conflict routines for function units. Don't bother writing one if there is only one busy value. */ for (unit = units; unit; unit = unit->next) { /* See if only one case exists and if there is a constant value for that case. If so, we don't need a function. */ str = (char *) alloca (strlen (unit->name) + 10); sprintf (str, "*%s_cases", unit->name); attr = find_attr (str, 0); if (! attr) abort (); value = find_single_value (attr); if (value && GET_CODE (value) == CONST_STRING) { sprintf (str, "*%s_case_%s", unit->name, XSTR (value, 0)); attr = find_attr (str, 0); if (! attr) abort (); value = find_single_value (attr); if (value && GET_CODE (value) == CONST_STRING) { unit->needs_conflict_function = 0; unit->default_cost = value; continue; } } /* The function first computes the case from the candidate insn. */ unit->needs_conflict_function = 1; unit->default_cost = make_numeric_value (0); printf ("static int\n"); printf ("%s_unit_conflict_cost (executing_insn, candidate_insn)\n", unit->name); printf (" rtx executing_insn;\n"); printf (" rtx candidate_insn;\n"); printf ("{\n"); printf (" rtx insn;\n"); printf (" int casenum;\n\n"); printf (" insn = candidate_insn;\n"); printf (" switch (recog_memoized (insn))\n"); printf (" {\n"); /* Write the `switch' statement to get the case value. */ sprintf (str, "*%s_cases", unit->name); case_attr = find_attr (str, 0); if (! case_attr) abort (); common_av = find_most_used (case_attr); for (av = case_attr->first_value; av; av = av->next) if (av != common_av) write_attr_case (case_attr, av, 1, "casenum =", ";", 4, unit->condexp); write_attr_case (case_attr, common_av, 0, "casenum =", ";", 4, unit->condexp); printf (" }\n\n"); /* Now write an outer switch statement on each case. Then write the tests on the executing function within each. */ printf (" insn = executing_insn;\n"); printf (" switch (casenum)\n"); printf (" {\n"); for (i = 0; i < unit->num_opclasses; i++) { /* Ensure using this case. */ using_case = 0; for (av = case_attr->first_value; av; av = av->next) if (av->num_insns && contained_in_p (make_numeric_value (i), av->value)) using_case = 1; if (! using_case) continue; printf (" case %d:\n", i); sprintf (str, "*%s_case_%d", unit->name, i); attr = find_attr (str, 0); if (! attr) abort (); /* If single value, just write it. */ value = find_single_value (attr); if (value) write_attr_set (attr, 6, value, "return", ";\n", true_rtx, -2); else { common_av = find_most_used (attr); printf (" switch (recog_memoized (insn))\n"); printf ("\t{\n"); for (av = attr->first_value; av; av = av->next) if (av != common_av) write_attr_case (attr, av, 1, "return", ";", 8, unit->condexp); write_attr_case (attr, common_av, 0, "return", ";", 8, unit->condexp); printf (" }\n\n"); } } printf (" }\n}\n\n"); } /* Now that all functions have been written, write the table describing the function units. The name is included for documentation purposes only. */ printf ("struct function_unit_desc function_units[] = {\n"); for (unit = units; unit; unit = unit->next) { printf (" {\"%s\", %d, %d, %d, %s, %s_unit_ready_cost, ", unit->name, 1 << unit->num, unit->multiplicity, unit->simultaneity, XSTR (unit->default_cost, 0), unit->name); if (unit->needs_conflict_function) printf ("%s_unit_conflict_cost", unit->name); else printf ("0"); printf ("}, \n"); } printf ("};\n\n"); } /* This page contains miscellaneous utility routines. */ /* Given a string, return the number of comma-separated elements in it. Return 0 for the null string. */ static int n_comma_elts (s) char *s; { int n; if (*s == '\0') return 0; for (n = 1; *s; s++) if (*s == ',') n++; return n; } /* Given a pointer to a (char *), return a malloc'ed string containing the next comma-separated element. Advance the pointer to after the string scanned, or the end-of-string. Return NULL if at end of string. */ static char * next_comma_elt (pstr) char **pstr; { char *out_str; char *p; if (**pstr == '\0') return NULL; /* Find end of string to compute length. */ for (p = *pstr; *p != ',' && *p != '\0'; p++) ; out_str = attr_string (*pstr, p - *pstr); *pstr = p; if (**pstr == ',') (*pstr)++; return out_str; } /* Return a `struct attr_desc' pointer for a given named attribute. If CREATE is non-zero, build a new attribute, if one does not exist. */ static struct attr_desc * find_attr (name, create) char *name; int create; { struct attr_desc *attr; int index; /* Before we resort to using `strcmp', see if the string address matches anywhere. In most cases, it should have been canonicalized to do so. */ if (name == alternative_name) return NULL; index = name[0] & (MAX_ATTRS_INDEX - 1); for (attr = attrs[index]; attr; attr = attr->next) if (name == attr->name) return attr; /* Otherwise, do it the slow way. */ for (attr = attrs[index]; attr; attr = attr->next) if (name[0] == attr->name[0] && ! strcmp (name, attr->name)) return attr; if (! create) return NULL; attr = (struct attr_desc *) xmalloc (sizeof (struct attr_desc)); attr->name = attr_string (name, strlen (name)); attr->first_value = attr->default_val = NULL; attr->is_numeric = attr->is_const = attr->is_special = 0; attr->next = attrs[index]; attrs[index] = attr; return attr; } /* Create internal attribute with the given default value. */ static void make_internal_attr (name, value, special) char *name; rtx value; int special; { struct attr_desc *attr; attr = find_attr (name, 1); if (attr->default_val) abort (); attr->is_numeric = 1; attr->is_const = 0; attr->is_special = special; attr->default_val = get_attr_value (value, attr, -2); } /* Find the most used value of an attribute. */ static struct attr_value * find_most_used (attr) struct attr_desc *attr; { struct attr_value *av; struct attr_value *most_used; int nuses; most_used = NULL; nuses = -1; for (av = attr->first_value; av; av = av->next) if (av->num_insns > nuses) nuses = av->num_insns, most_used = av; return most_used; } /* If an attribute only has a single value used, return it. Otherwise return NULL. */ static rtx find_single_value (attr) struct attr_desc *attr; { struct attr_value *av; rtx unique_value; unique_value = NULL; for (av = attr->first_value; av; av = av->next) if (av->num_insns) { if (unique_value) return NULL; else unique_value = av->value; } return unique_value; } /* Return (attr_value "n") */ static rtx make_numeric_value (n) int n; { static rtx int_values[20]; rtx exp; char *p; if (n < 0) abort (); if (n < 20 && int_values[n]) return int_values[n]; p = attr_printf ((n < 1000 ? 4 : HOST_BITS_PER_INT * 3 / 10 + 3), "%d", n); exp = attr_rtx (CONST_STRING, p); if (n < 20) int_values[n] = exp; return exp; } char * xrealloc (ptr, size) char *ptr; unsigned size; { char *result = (char *) realloc (ptr, size); if (!result) fatal ("virtual memory exhausted"); return result; } char * xmalloc (size) unsigned size; { register char *val = (char *) malloc (size); if (val == 0) fatal ("virtual memory exhausted"); return val; } static rtx copy_rtx_unchanging (orig) register rtx orig; { register rtx copy; register RTX_CODE code; if (RTX_UNCHANGING_P (orig) || MEM_IN_STRUCT_P (orig)) return orig; MEM_IN_STRUCT_P (orig) = 1; return orig; #if 0 code = GET_CODE (orig); switch (code) { case CONST_INT: case CONST_DOUBLE: case SYMBOL_REF: case CODE_LABEL: return orig; } copy = rtx_alloc (code); PUT_MODE (copy, GET_MODE (orig)); RTX_UNCHANGING_P (copy) = 1; bcopy (&XEXP (orig, 0), &XEXP (copy, 0), GET_RTX_LENGTH (GET_CODE (copy)) * sizeof (rtx)); return copy; #endif } static void fatal (s, a1, a2) char *s; { fprintf (stderr, "genattrtab: "); fprintf (stderr, s, a1, a2); fprintf (stderr, "\n"); exit (FATAL_EXIT_CODE); } /* More 'friendly' abort that prints the line and file. config.h can #define abort fancy_abort if you like that sort of thing. */ void fancy_abort () { fatal ("Internal gcc abort."); } int main (argc, argv) int argc; char **argv; { rtx desc; FILE *infile; register int c; struct attr_desc *attr; struct attr_value *av; struct insn_def *id; rtx tem; int i; obstack_init (rtl_obstack); obstack_init (hash_obstack); obstack_init (temp_obstack); if (argc <= 1) fatal ("No input file name."); infile = fopen (argv[1], "r"); if (infile == 0) { perror (argv[1]); exit (FATAL_EXIT_CODE); } init_rtl (); /* Set up true and false rtx's */ true_rtx = rtx_alloc (CONST_INT); XWINT (true_rtx, 0) = 1; false_rtx = rtx_alloc (CONST_INT); XWINT (false_rtx, 0) = 0; RTX_UNCHANGING_P (true_rtx) = RTX_UNCHANGING_P (false_rtx) = 1; RTX_INTEGRATED_P (true_rtx) = RTX_INTEGRATED_P (false_rtx) = 1; alternative_name = attr_string ("alternative", strlen ("alternative")); printf ("/* Generated automatically by the program `genattrtab'\n\ from the machine description file `md'. */\n\n"); /* Read the machine description. */ while (1) { c = read_skip_spaces (infile); if (c == EOF) break; ungetc (c, infile); desc = read_rtx (infile); if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_PEEPHOLE || GET_CODE (desc) == DEFINE_ASM_ATTRIBUTES) gen_insn (desc); else if (GET_CODE (desc) == DEFINE_EXPAND) insn_code_number++, insn_index_number++; else if (GET_CODE (desc) == DEFINE_SPLIT) insn_code_number++, insn_index_number++; else if (GET_CODE (desc) == DEFINE_ATTR) { gen_attr (desc); insn_index_number++; } else if (GET_CODE (desc) == DEFINE_DELAY) { gen_delay (desc); insn_index_number++; } else if (GET_CODE (desc) == DEFINE_FUNCTION_UNIT) { gen_unit (desc); insn_index_number++; } } /* If we didn't have a DEFINE_ASM_ATTRIBUTES, make a null one. */ if (! got_define_asm_attributes) { tem = rtx_alloc (DEFINE_ASM_ATTRIBUTES); XVEC (tem, 0) = rtvec_alloc (0); gen_insn (tem); } /* Expand DEFINE_DELAY information into new attribute. */ if (num_delays) expand_delays (); /* Expand DEFINE_FUNCTION_UNIT information into new attributes. */ if (num_units) expand_units (); printf ("#include \"config.h\"\n"); printf ("#include \"rtl.h\"\n"); printf ("#include \"insn-config.h\"\n"); printf ("#include \"recog.h\"\n"); printf ("#include \"regs.h\"\n"); printf ("#include \"real.h\"\n"); printf ("#include \"output.h\"\n"); printf ("#include \"insn-attr.h\"\n"); printf ("\n"); printf ("#define operands recog_operand\n\n"); /* Make `insn_alternatives'. */ insn_alternatives = (int *) xmalloc (insn_code_number * sizeof (int)); for (id = defs; id; id = id->next) if (id->insn_code >= 0) insn_alternatives[id->insn_code] = (1 << id->num_alternatives) - 1; /* Make `insn_n_alternatives'. */ insn_n_alternatives = (int *) xmalloc (insn_code_number * sizeof (int)); for (id = defs; id; id = id->next) if (id->insn_code >= 0) insn_n_alternatives[id->insn_code] = id->num_alternatives; /* Prepare to write out attribute subroutines by checking everything stored away and building the attribute cases. */ check_defs (); for (i = 0; i < MAX_ATTRS_INDEX; i++) for (attr = attrs[i]; attr; attr = attr->next) { attr->default_val->value = check_attr_value (attr->default_val->value, attr); fill_attr (attr); } /* Construct extra attributes for `length'. */ make_length_attrs (); /* Perform any possible optimizations to speed up compilation. */ optimize_attrs (); /* Now write out all the `gen_attr_...' routines. Do these before the special routines (specifically before write_function_unit_info), so that they get defined before they are used. */ for (i = 0; i < MAX_ATTRS_INDEX; i++) for (attr = attrs[i]; attr; attr = attr->next) { if (! attr->is_special) write_attr_get (attr); } /* Write out delay eligibility information, if DEFINE_DELAY present. (The function to compute the number of delay slots will be written below.) */ if (num_delays) { write_eligible_delay ("delay"); if (have_annul_true) write_eligible_delay ("annul_true"); if (have_annul_false) write_eligible_delay ("annul_false"); } /* Write out information about function units. */ if (num_units) write_function_unit_info (); fflush (stdout); exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE); /* NOTREACHED */ return 0; }