1 /* FR30 specific functions.
2 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2007
3 Free Software Foundation, Inc.
4 Contributed by Cygnus Solutions.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
27 #include "coretypes.h"
31 #include "hard-reg-set.h"
33 #include "insn-config.h"
34 #include "conditions.h"
35 #include "insn-attr.h"
47 #include "target-def.h"
50 /*{{{ Function Prologues & Epilogues */
52 /* Define the information needed to generate branch and scc insns. This is
53 stored from the compare operation. */
55 struct rtx_def
* fr30_compare_op0
;
56 struct rtx_def
* fr30_compare_op1
;
58 /* The FR30 stack looks like this:
60 Before call After call
62 +-----------------------+ +-----------------------+ high
64 | local variables, | | local variables, |
65 | reg save area, etc. | | reg save area, etc. |
67 +-----------------------+ +-----------------------+
69 | args to the func that | | args to this func. |
70 | is being called that | | |
71 SP ->| do not fit in regs | | |
72 +-----------------------+ +-----------------------+
73 | args that used to be | \
74 | in regs; only created | | pretend_size
75 AP-> | for vararg funcs | /
76 +-----------------------+
78 | register save area | |
80 +-----------------------+ | reg_size
82 +-----------------------+ |
83 FP ->| previous frame ptr | /
84 +-----------------------+
86 | local variables | | var_size
88 +-----------------------+
90 low | room for args to | |
91 memory | other funcs called | | args_size
94 +-----------------------+
96 Note, AP is a fake hard register. It will be eliminated in favor of
97 SP or FP as appropriate.
99 Note, Some or all of the stack sections above may be omitted if they
102 /* Structure to be filled in by fr30_compute_frame_size() with register
103 save masks, and offsets for the current function. */
104 struct fr30_frame_info
106 unsigned int total_size
; /* # Bytes that the entire frame takes up. */
107 unsigned int pretend_size
; /* # Bytes we push and pretend caller did. */
108 unsigned int args_size
; /* # Bytes that outgoing arguments take up. */
109 unsigned int reg_size
; /* # Bytes needed to store regs. */
110 unsigned int var_size
; /* # Bytes that variables take up. */
111 unsigned int frame_size
; /* # Bytes in current frame. */
112 unsigned int gmask
; /* Mask of saved registers. */
113 unsigned int save_fp
; /* Nonzero if frame pointer must be saved. */
114 unsigned int save_rp
; /* Nonzero if return pointer must be saved. */
115 int initialised
; /* Nonzero if frame size already calculated. */
118 /* Current frame information calculated by fr30_compute_frame_size(). */
119 static struct fr30_frame_info current_frame_info
;
121 /* Zero structure to initialize current_frame_info. */
122 static struct fr30_frame_info zero_frame_info
;
124 static void fr30_setup_incoming_varargs (CUMULATIVE_ARGS
*, enum machine_mode
,
126 static bool fr30_must_pass_in_stack (enum machine_mode
, tree
);
127 static int fr30_arg_partial_bytes (CUMULATIVE_ARGS
*, enum machine_mode
,
131 #define FRAME_POINTER_MASK (1 << (FRAME_POINTER_REGNUM))
132 #define RETURN_POINTER_MASK (1 << (RETURN_POINTER_REGNUM))
134 /* Tell prologue and epilogue if register REGNO should be saved / restored.
135 The return address and frame pointer are treated separately.
136 Don't consider them here. */
137 #define MUST_SAVE_REGISTER(regno) \
138 ( (regno) != RETURN_POINTER_REGNUM \
139 && (regno) != FRAME_POINTER_REGNUM \
140 && df_regs_ever_live_p (regno) \
141 && ! call_used_regs [regno] )
143 #define MUST_SAVE_FRAME_POINTER (df_regs_ever_live_p (FRAME_POINTER_REGNUM) || frame_pointer_needed)
144 #define MUST_SAVE_RETURN_POINTER (df_regs_ever_live_p (RETURN_POINTER_REGNUM) || current_function_profile)
146 #if UNITS_PER_WORD == 4
147 #define WORD_ALIGN(SIZE) (((SIZE) + 3) & ~3)
150 /* Initialize the GCC target structure. */
151 #undef TARGET_ASM_ALIGNED_HI_OP
152 #define TARGET_ASM_ALIGNED_HI_OP "\t.hword\t"
153 #undef TARGET_ASM_ALIGNED_SI_OP
154 #define TARGET_ASM_ALIGNED_SI_OP "\t.word\t"
156 #undef TARGET_PROMOTE_PROTOTYPES
157 #define TARGET_PROMOTE_PROTOTYPES hook_bool_tree_true
158 #undef TARGET_PASS_BY_REFERENCE
159 #define TARGET_PASS_BY_REFERENCE hook_pass_by_reference_must_pass_in_stack
160 #undef TARGET_ARG_PARTIAL_BYTES
161 #define TARGET_ARG_PARTIAL_BYTES fr30_arg_partial_bytes
163 #undef TARGET_SETUP_INCOMING_VARARGS
164 #define TARGET_SETUP_INCOMING_VARARGS fr30_setup_incoming_varargs
165 #undef TARGET_MUST_PASS_IN_STACK
166 #define TARGET_MUST_PASS_IN_STACK fr30_must_pass_in_stack
168 struct gcc_target targetm
= TARGET_INITIALIZER
;
170 /* Returns the number of bytes offset between FROM_REG and TO_REG
171 for the current function. As a side effect it fills in the
172 current_frame_info structure, if the data is available. */
174 fr30_compute_frame_size (int from_reg
, int to_reg
)
177 unsigned int return_value
;
178 unsigned int var_size
;
179 unsigned int args_size
;
180 unsigned int pretend_size
;
181 unsigned int reg_size
;
184 var_size
= WORD_ALIGN (get_frame_size ());
185 args_size
= WORD_ALIGN (current_function_outgoing_args_size
);
186 pretend_size
= current_function_pretend_args_size
;
191 /* Calculate space needed for registers. */
192 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
194 if (MUST_SAVE_REGISTER (regno
))
196 reg_size
+= UNITS_PER_WORD
;
201 current_frame_info
.save_fp
= MUST_SAVE_FRAME_POINTER
;
202 current_frame_info
.save_rp
= MUST_SAVE_RETURN_POINTER
;
204 reg_size
+= (current_frame_info
.save_fp
+ current_frame_info
.save_rp
)
207 /* Save computed information. */
208 current_frame_info
.pretend_size
= pretend_size
;
209 current_frame_info
.var_size
= var_size
;
210 current_frame_info
.args_size
= args_size
;
211 current_frame_info
.reg_size
= reg_size
;
212 current_frame_info
.frame_size
= args_size
+ var_size
;
213 current_frame_info
.total_size
= args_size
+ var_size
+ reg_size
+ pretend_size
;
214 current_frame_info
.gmask
= gmask
;
215 current_frame_info
.initialised
= reload_completed
;
217 /* Calculate the required distance. */
220 if (to_reg
== STACK_POINTER_REGNUM
)
221 return_value
+= args_size
+ var_size
;
223 if (from_reg
== ARG_POINTER_REGNUM
)
224 return_value
+= reg_size
;
229 /* Called after register allocation to add any instructions needed for the
230 prologue. Using a prologue insn is favored compared to putting all of the
231 instructions in output_function_prologue(), since it allows the scheduler
232 to intermix instructions with the saves of the caller saved registers. In
233 some cases, it might be necessary to emit a barrier instruction as the last
234 insn to prevent such scheduling. */
237 fr30_expand_prologue (void)
242 if (! current_frame_info
.initialised
)
243 fr30_compute_frame_size (0, 0);
245 /* This cases shouldn't happen. Catch it now. */
246 gcc_assert (current_frame_info
.total_size
|| !current_frame_info
.gmask
);
248 /* Allocate space for register arguments if this is a variadic function. */
249 if (current_frame_info
.pretend_size
)
251 int regs_to_save
= current_frame_info
.pretend_size
/ UNITS_PER_WORD
;
253 /* Push argument registers into the pretend arg area. */
254 for (regno
= FIRST_ARG_REGNUM
+ FR30_NUM_ARG_REGS
; regno
--, regs_to_save
--;)
256 insn
= emit_insn (gen_movsi_push (gen_rtx_REG (Pmode
, regno
)));
257 RTX_FRAME_RELATED_P (insn
) = 1;
261 if (current_frame_info
.gmask
)
263 /* Save any needed call-saved regs. */
264 for (regno
= STACK_POINTER_REGNUM
; regno
--;)
266 if ((current_frame_info
.gmask
& (1 << regno
)) != 0)
268 insn
= emit_insn (gen_movsi_push (gen_rtx_REG (Pmode
, regno
)));
269 RTX_FRAME_RELATED_P (insn
) = 1;
274 /* Save return address if necessary. */
275 if (current_frame_info
.save_rp
)
277 insn
= emit_insn (gen_movsi_push (gen_rtx_REG (Pmode
,
278 RETURN_POINTER_REGNUM
)));
279 RTX_FRAME_RELATED_P (insn
) = 1;
282 /* Save old frame pointer and create new one, if necessary. */
283 if (current_frame_info
.save_fp
)
285 if (current_frame_info
.frame_size
< ((1 << 10) - UNITS_PER_WORD
))
287 int enter_size
= current_frame_info
.frame_size
+ UNITS_PER_WORD
;
290 insn
= emit_insn (gen_enter_func (GEN_INT (enter_size
)));
291 RTX_FRAME_RELATED_P (insn
) = 1;
293 pattern
= PATTERN (insn
);
295 /* Also mark all 3 subexpressions as RTX_FRAME_RELATED_P. */
296 if (GET_CODE (pattern
) == PARALLEL
)
299 for (x
= XVECLEN (pattern
, 0); x
--;)
301 rtx part
= XVECEXP (pattern
, 0, x
);
303 /* One of the insns in the ENTER pattern updates the
304 frame pointer. If we do not actually need the frame
305 pointer in this function then this is a side effect
306 rather than a desired effect, so we do not mark that
307 insn as being related to the frame set up. Doing this
308 allows us to compile the crash66.C test file in the
310 if (! frame_pointer_needed
311 && GET_CODE (part
) == SET
312 && REGNO (SET_DEST (part
)) == HARD_FRAME_POINTER_REGNUM
)
313 RTX_FRAME_RELATED_P (part
) = 0;
315 RTX_FRAME_RELATED_P (part
) = 1;
321 insn
= emit_insn (gen_movsi_push (frame_pointer_rtx
));
322 RTX_FRAME_RELATED_P (insn
) = 1;
324 if (frame_pointer_needed
)
326 insn
= emit_insn (gen_movsi (frame_pointer_rtx
, stack_pointer_rtx
));
327 RTX_FRAME_RELATED_P (insn
) = 1;
332 /* Allocate the stack frame. */
333 if (current_frame_info
.frame_size
== 0)
334 ; /* Nothing to do. */
335 else if (current_frame_info
.save_fp
336 && current_frame_info
.frame_size
< ((1 << 10) - UNITS_PER_WORD
))
337 ; /* Nothing to do. */
338 else if (current_frame_info
.frame_size
<= 512)
340 insn
= emit_insn (gen_add_to_stack (GEN_INT (- current_frame_info
.frame_size
)));
341 RTX_FRAME_RELATED_P (insn
) = 1;
345 rtx tmp
= gen_rtx_REG (Pmode
, PROLOGUE_TMP_REGNUM
);
346 insn
= emit_insn (gen_movsi (tmp
, GEN_INT (current_frame_info
.frame_size
)));
347 RTX_FRAME_RELATED_P (insn
) = 1;
348 insn
= emit_insn (gen_subsi3 (stack_pointer_rtx
, stack_pointer_rtx
, tmp
));
349 RTX_FRAME_RELATED_P (insn
) = 1;
352 if (current_function_profile
)
353 emit_insn (gen_blockage ());
356 /* Called after register allocation to add any instructions needed for the
357 epilogue. Using an epilogue insn is favored compared to putting all of the
358 instructions in output_function_epilogue(), since it allows the scheduler
359 to intermix instructions with the restores of the caller saved registers.
360 In some cases, it might be necessary to emit a barrier instruction as the
361 first insn to prevent such scheduling. */
363 fr30_expand_epilogue (void)
367 /* Perform the inversion operations of the prologue. */
368 gcc_assert (current_frame_info
.initialised
);
370 /* Pop local variables and arguments off the stack.
371 If frame_pointer_needed is TRUE then the frame pointer register
372 has actually been used as a frame pointer, and we can recover
373 the stack pointer from it, otherwise we must unwind the stack
375 if (current_frame_info
.frame_size
> 0)
377 if (current_frame_info
.save_fp
&& frame_pointer_needed
)
379 emit_insn (gen_leave_func ());
380 current_frame_info
.save_fp
= 0;
382 else if (current_frame_info
.frame_size
<= 508)
383 emit_insn (gen_add_to_stack
384 (GEN_INT (current_frame_info
.frame_size
)));
387 rtx tmp
= gen_rtx_REG (Pmode
, PROLOGUE_TMP_REGNUM
);
388 emit_insn (gen_movsi (tmp
, GEN_INT (current_frame_info
.frame_size
)));
389 emit_insn (gen_addsi3 (stack_pointer_rtx
, stack_pointer_rtx
, tmp
));
393 if (current_frame_info
.save_fp
)
394 emit_insn (gen_movsi_pop (frame_pointer_rtx
));
396 /* Pop all the registers that were pushed. */
397 if (current_frame_info
.save_rp
)
398 emit_insn (gen_movsi_pop (gen_rtx_REG (Pmode
, RETURN_POINTER_REGNUM
)));
400 for (regno
= 0; regno
< STACK_POINTER_REGNUM
; regno
++)
401 if (current_frame_info
.gmask
& (1 << regno
))
402 emit_insn (gen_movsi_pop (gen_rtx_REG (Pmode
, regno
)));
404 if (current_frame_info
.pretend_size
)
405 emit_insn (gen_add_to_stack (GEN_INT (current_frame_info
.pretend_size
)));
407 /* Reset state info for each function. */
408 current_frame_info
= zero_frame_info
;
410 emit_jump_insn (gen_return_from_func ());
413 /* Do any needed setup for a variadic function. We must create a register
414 parameter block, and then copy any anonymous arguments, plus the last
415 named argument, from registers into memory. * copying actually done in
416 fr30_expand_prologue().
418 ARG_REGS_USED_SO_FAR has *not* been updated for the last named argument
419 which has type TYPE and mode MODE, and we rely on this fact. */
421 fr30_setup_incoming_varargs (CUMULATIVE_ARGS
*arg_regs_used_so_far
,
422 enum machine_mode mode
,
423 tree type ATTRIBUTE_UNUSED
,
425 int second_time ATTRIBUTE_UNUSED
)
429 /* All BLKmode values are passed by reference. */
430 gcc_assert (mode
!= BLKmode
);
432 /* ??? This run-time test as well as the code inside the if
433 statement is probably unnecessary. */
434 if (targetm
.calls
.strict_argument_naming (arg_regs_used_so_far
))
435 /* If TARGET_STRICT_ARGUMENT_NAMING returns true, then the last named
436 arg must not be treated as an anonymous arg. */
437 arg_regs_used_so_far
+= fr30_num_arg_regs (mode
, type
);
439 size
= FR30_NUM_ARG_REGS
- (* arg_regs_used_so_far
);
444 * pretend_size
= (size
* UNITS_PER_WORD
);
448 /*{{{ Printing operands */
450 /* Print a memory address as an operand to reference that memory location. */
453 fr30_print_operand_address (FILE *stream
, rtx address
)
455 switch (GET_CODE (address
))
458 output_addr_const (stream
, address
);
462 fprintf (stderr
, "code = %x\n", GET_CODE (address
));
464 output_operand_lossage ("fr30_print_operand_address: unhandled address");
469 /* Print an operand. */
472 fr30_print_operand (FILE *file
, rtx x
, int code
)
479 /* Output a :D if this instruction is delayed. */
480 if (dbr_sequence_length () != 0)
485 /* Compute the register name of the second register in a hi/lo
487 if (GET_CODE (x
) != REG
)
488 output_operand_lossage ("fr30_print_operand: unrecognized %%p code");
490 fprintf (file
, "r%d", REGNO (x
) + 1);
494 /* Convert GCC's comparison operators into FR30 comparison codes. */
495 switch (GET_CODE (x
))
497 case EQ
: fprintf (file
, "eq"); break;
498 case NE
: fprintf (file
, "ne"); break;
499 case LT
: fprintf (file
, "lt"); break;
500 case LE
: fprintf (file
, "le"); break;
501 case GT
: fprintf (file
, "gt"); break;
502 case GE
: fprintf (file
, "ge"); break;
503 case LTU
: fprintf (file
, "c"); break;
504 case LEU
: fprintf (file
, "ls"); break;
505 case GTU
: fprintf (file
, "hi"); break;
506 case GEU
: fprintf (file
, "nc"); break;
508 output_operand_lossage ("fr30_print_operand: unrecognized %%b code");
514 /* Convert GCC's comparison operators into the complimentary FR30
516 switch (GET_CODE (x
))
518 case EQ
: fprintf (file
, "ne"); break;
519 case NE
: fprintf (file
, "eq"); break;
520 case LT
: fprintf (file
, "ge"); break;
521 case LE
: fprintf (file
, "gt"); break;
522 case GT
: fprintf (file
, "le"); break;
523 case GE
: fprintf (file
, "lt"); break;
524 case LTU
: fprintf (file
, "nc"); break;
525 case LEU
: fprintf (file
, "hi"); break;
526 case GTU
: fprintf (file
, "ls"); break;
527 case GEU
: fprintf (file
, "c"); break;
529 output_operand_lossage ("fr30_print_operand: unrecognized %%B code");
535 /* Print a signed byte value as an unsigned value. */
536 if (GET_CODE (x
) != CONST_INT
)
537 output_operand_lossage ("fr30_print_operand: invalid operand to %%A code");
546 fprintf (file
, HOST_WIDE_INT_PRINT_DEC
, val
);
551 if (GET_CODE (x
) != CONST_INT
554 output_operand_lossage ("fr30_print_operand: invalid %%x code");
556 fprintf (file
, HOST_WIDE_INT_PRINT_DEC
, INTVAL (x
) - 16);
560 if (GET_CODE (x
) != CONST_DOUBLE
)
561 output_operand_lossage ("fr30_print_operand: invalid %%F code");
566 real_to_decimal (str
, CONST_DOUBLE_REAL_VALUE (x
),
577 fprintf (stderr
, "unknown code = %x\n", code
);
578 output_operand_lossage ("fr30_print_operand: unknown code");
582 switch (GET_CODE (x
))
585 fputs (reg_names
[REGNO (x
)], file
);
591 switch (GET_CODE (x0
))
594 gcc_assert ((unsigned) REGNO (x0
) < ARRAY_SIZE (reg_names
));
595 fprintf (file
, "@%s", reg_names
[REGNO (x0
)]);
599 if (GET_CODE (XEXP (x0
, 0)) != REG
600 || REGNO (XEXP (x0
, 0)) < FRAME_POINTER_REGNUM
601 || REGNO (XEXP (x0
, 0)) > STACK_POINTER_REGNUM
602 || GET_CODE (XEXP (x0
, 1)) != CONST_INT
)
604 fprintf (stderr
, "bad INDEXed address:");
606 output_operand_lossage ("fr30_print_operand: unhandled MEM");
608 else if (REGNO (XEXP (x0
, 0)) == FRAME_POINTER_REGNUM
)
610 HOST_WIDE_INT val
= INTVAL (XEXP (x0
, 1));
611 if (val
< -(1 << 9) || val
> ((1 << 9) - 4))
613 fprintf (stderr
, "frame INDEX out of range:");
615 output_operand_lossage ("fr30_print_operand: unhandled MEM");
617 fprintf (file
, "@(r14, #" HOST_WIDE_INT_PRINT_DEC
")", val
);
621 HOST_WIDE_INT val
= INTVAL (XEXP (x0
, 1));
622 if (val
< 0 || val
> ((1 << 6) - 4))
624 fprintf (stderr
, "stack INDEX out of range:");
626 output_operand_lossage ("fr30_print_operand: unhandled MEM");
628 fprintf (file
, "@(r15, #" HOST_WIDE_INT_PRINT_DEC
")", val
);
637 fprintf (stderr
, "bad MEM code = %x\n", GET_CODE (x0
));
639 output_operand_lossage ("fr30_print_operand: unhandled MEM");
645 /* We handle SFmode constants here as output_addr_const doesn't. */
646 if (GET_MODE (x
) == SFmode
)
651 REAL_VALUE_FROM_CONST_DOUBLE (d
, x
);
652 REAL_VALUE_TO_TARGET_SINGLE (d
, l
);
653 fprintf (file
, "0x%08lx", l
);
657 /* Fall through. Let output_addr_const deal with it. */
659 output_addr_const (file
, x
);
667 /*{{{ Function arguments */
669 /* Return true if we should pass an argument on the stack rather than
673 fr30_must_pass_in_stack (enum machine_mode mode
, tree type
)
679 return AGGREGATE_TYPE_P (type
);
682 /* Compute the number of word sized registers needed to hold a
683 function argument of mode INT_MODE and tree type TYPE. */
685 fr30_num_arg_regs (enum machine_mode mode
, tree type
)
689 if (targetm
.calls
.must_pass_in_stack (mode
, type
))
692 if (type
&& mode
== BLKmode
)
693 size
= int_size_in_bytes (type
);
695 size
= GET_MODE_SIZE (mode
);
697 return (size
+ UNITS_PER_WORD
- 1) / UNITS_PER_WORD
;
700 /* Returns the number of bytes in which *part* of a parameter of machine
701 mode MODE and tree type TYPE (which may be NULL if the type is not known).
702 If the argument fits entirely in the argument registers, or entirely on
703 the stack, then 0 is returned.
704 CUM is the number of argument registers already used by earlier
705 parameters to the function. */
708 fr30_arg_partial_bytes (CUMULATIVE_ARGS
*cum
, enum machine_mode mode
,
709 tree type
, bool named
)
711 /* Unnamed arguments, i.e. those that are prototyped as ...
712 are always passed on the stack.
713 Also check here to see if all the argument registers are full. */
714 if (named
== 0 || *cum
>= FR30_NUM_ARG_REGS
)
717 /* Work out how many argument registers would be needed if this
718 parameter were to be passed entirely in registers. If there
719 are sufficient argument registers available (or if no registers
720 are needed because the parameter must be passed on the stack)
721 then return zero, as this parameter does not require partial
722 register, partial stack stack space. */
723 if (*cum
+ fr30_num_arg_regs (mode
, type
) <= FR30_NUM_ARG_REGS
)
726 return (FR30_NUM_ARG_REGS
- *cum
) * UNITS_PER_WORD
;
730 /*{{{ Operand predicates */
733 #define Mmode enum machine_mode
736 /* Returns true iff all the registers in the operands array
737 are in descending or ascending order. */
739 fr30_check_multiple_regs (rtx
*operands
, int num_operands
, int descending
)
743 unsigned int prev_regno
= 0;
745 while (num_operands
--)
747 if (GET_CODE (operands
[num_operands
]) != REG
)
750 if (REGNO (operands
[num_operands
]) < prev_regno
)
753 prev_regno
= REGNO (operands
[num_operands
]);
758 unsigned int prev_regno
= CONDITION_CODE_REGNUM
;
760 while (num_operands
--)
762 if (GET_CODE (operands
[num_operands
]) != REG
)
765 if (REGNO (operands
[num_operands
]) > prev_regno
)
768 prev_regno
= REGNO (operands
[num_operands
]);
776 fr30_const_double_is_zero (rtx operand
)
780 if (operand
== NULL
|| GET_CODE (operand
) != CONST_DOUBLE
)
783 REAL_VALUE_FROM_CONST_DOUBLE (d
, operand
);
785 return REAL_VALUES_EQUAL (d
, dconst0
);
789 /*{{{ Instruction Output Routines */
791 /* Output a double word move.
792 It must be REG<-REG, REG<-MEM, MEM<-REG or REG<-CONST.
793 On the FR30 we are constrained by the fact that it does not
794 support offsetable addresses, and so we have to load the
795 address of the secnd word into the second destination register
796 before we can use it. */
799 fr30_move_double (rtx
* operands
)
801 rtx src
= operands
[1];
802 rtx dest
= operands
[0];
803 enum rtx_code src_code
= GET_CODE (src
);
804 enum rtx_code dest_code
= GET_CODE (dest
);
805 enum machine_mode mode
= GET_MODE (dest
);
810 if (dest_code
== REG
)
814 int reverse
= (REGNO (dest
) == REGNO (src
) + 1);
816 /* We normally copy the low-numbered register first. However, if
817 the first register of operand 0 is the same as the second register
818 of operand 1, we must copy in the opposite order. */
819 emit_insn (gen_rtx_SET (VOIDmode
,
820 operand_subword (dest
, reverse
, TRUE
, mode
),
821 operand_subword (src
, reverse
, TRUE
, mode
)));
823 emit_insn (gen_rtx_SET (VOIDmode
,
824 operand_subword (dest
, !reverse
, TRUE
, mode
),
825 operand_subword (src
, !reverse
, TRUE
, mode
)));
827 else if (src_code
== MEM
)
829 rtx addr
= XEXP (src
, 0);
830 int dregno
= REGNO (dest
);
835 /* If the high-address word is used in the address, we
836 must load it last. Otherwise, load it first. */
837 int reverse
= (refers_to_regno_p (dregno
, dregno
+ 1, addr
, 0) != 0);
839 gcc_assert (GET_CODE (addr
) == REG
);
841 dest0
= operand_subword (dest
, reverse
, TRUE
, mode
);
842 dest1
= operand_subword (dest
, !reverse
, TRUE
, mode
);
846 emit_insn (gen_rtx_SET (VOIDmode
, dest1
,
847 adjust_address (src
, SImode
, 0)));
848 emit_insn (gen_rtx_SET (SImode
, dest0
,
849 gen_rtx_REG (SImode
, REGNO (addr
))));
850 emit_insn (gen_rtx_SET (SImode
, dest0
,
851 plus_constant (dest0
, UNITS_PER_WORD
)));
853 new_mem
= gen_rtx_MEM (SImode
, dest0
);
854 MEM_COPY_ATTRIBUTES (new_mem
, src
);
856 emit_insn (gen_rtx_SET (VOIDmode
, dest0
, new_mem
));
860 emit_insn (gen_rtx_SET (VOIDmode
, dest0
,
861 adjust_address (src
, SImode
, 0)));
862 emit_insn (gen_rtx_SET (SImode
, dest1
,
863 gen_rtx_REG (SImode
, REGNO (addr
))));
864 emit_insn (gen_rtx_SET (SImode
, dest1
,
865 plus_constant (dest1
, UNITS_PER_WORD
)));
867 new_mem
= gen_rtx_MEM (SImode
, dest1
);
868 MEM_COPY_ATTRIBUTES (new_mem
, src
);
870 emit_insn (gen_rtx_SET (VOIDmode
, dest1
, new_mem
));
873 else if (src_code
== CONST_INT
|| src_code
== CONST_DOUBLE
)
876 split_double (src
, &words
[0], &words
[1]);
877 emit_insn (gen_rtx_SET (VOIDmode
,
878 operand_subword (dest
, 0, TRUE
, mode
),
881 emit_insn (gen_rtx_SET (VOIDmode
,
882 operand_subword (dest
, 1, TRUE
, mode
),
886 else if (src_code
== REG
&& dest_code
== MEM
)
888 rtx addr
= XEXP (dest
, 0);
892 gcc_assert (GET_CODE (addr
) == REG
);
894 src0
= operand_subword (src
, 0, TRUE
, mode
);
895 src1
= operand_subword (src
, 1, TRUE
, mode
);
897 emit_move_insn (adjust_address (dest
, SImode
, 0), src0
);
899 if (REGNO (addr
) == STACK_POINTER_REGNUM
900 || REGNO (addr
) == FRAME_POINTER_REGNUM
)
901 emit_insn (gen_rtx_SET (VOIDmode
,
902 adjust_address (dest
, SImode
, UNITS_PER_WORD
),
907 rtx scratch_reg_r0
= gen_rtx_REG (SImode
, 0);
909 /* We need a scratch register to hold the value of 'address + 4'.
910 We use r0 for this purpose. It is used for example for long
911 jumps and is already marked to not be used by normal register
913 emit_insn (gen_movsi_internal (scratch_reg_r0
, addr
));
914 emit_insn (gen_addsi_small_int (scratch_reg_r0
, scratch_reg_r0
,
915 GEN_INT (UNITS_PER_WORD
)));
916 new_mem
= gen_rtx_MEM (SImode
, scratch_reg_r0
);
917 MEM_COPY_ATTRIBUTES (new_mem
, dest
);
918 emit_move_insn (new_mem
, src1
);
919 emit_insn (gen_blockage ());
923 /* This should have been prevented by the constraints on movdi_insn. */
933 /* Local Variables: */