[gcc.git] / gcc / real.h

/* Front-end tree definitions for GNU compiler.
   Copyright (C) 1989, 1991, 1994 Free Software Foundation, Inc.

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, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#ifndef REAL_H_INCLUDED
#define REAL_H_INCLUDED

/* Define codes for all the float formats that we know of.  */
#define UNKNOWN_FLOAT_FORMAT 0
#define IEEE_FLOAT_FORMAT 1
#define VAX_FLOAT_FORMAT 2
#define IBM_FLOAT_FORMAT 3

/* Default to IEEE float if not specified.  Nearly all machines use it.  */

#ifndef TARGET_FLOAT_FORMAT
#define	TARGET_FLOAT_FORMAT	IEEE_FLOAT_FORMAT
#endif

#ifndef HOST_FLOAT_FORMAT
#define	HOST_FLOAT_FORMAT	IEEE_FLOAT_FORMAT
#endif

#if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
#define REAL_INFINITY
#endif

/* If FLOAT_WORDS_BIG_ENDIAN and HOST_FLOAT_WORDS_BIG_ENDIAN are not defined
   in the header files, then this implies the word-endianness is the same as
   for integers.  */

/* This is defined 0 or 1, like WORDS_BIG_ENDIAN.  */
#ifndef FLOAT_WORDS_BIG_ENDIAN
#define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
#endif

/* This is defined 0 or 1, unlike HOST_WORDS_BIG_ENDIAN.  */
#ifndef HOST_FLOAT_WORDS_BIG_ENDIAN
#ifdef HOST_WORDS_BIG_ENDIAN
#define HOST_FLOAT_WORDS_BIG_ENDIAN 1
#else
#define HOST_FLOAT_WORDS_BIG_ENDIAN 0
#endif
#endif

/* Defining REAL_ARITHMETIC invokes a floating point emulator
   that can produce a target machine format differing by more
   than just endian-ness from the host's format.  The emulator
   is also used to support extended real XFmode.  */
#ifndef LONG_DOUBLE_TYPE_SIZE
#define LONG_DOUBLE_TYPE_SIZE 64
#endif
#if (LONG_DOUBLE_TYPE_SIZE == 96) || (LONG_DOUBLE_TYPE_SIZE == 128)
#ifndef REAL_ARITHMETIC
#define REAL_ARITHMETIC
#endif
#endif
#ifdef REAL_ARITHMETIC
/* **** Start of software floating point emulator interface macros **** */

/* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE
   has been defined to be 96 in the tm.h machine file. */
#if (LONG_DOUBLE_TYPE_SIZE == 96)
#define REAL_IS_NOT_DOUBLE
#define REAL_ARITHMETIC
typedef struct {
  HOST_WIDE_INT r[(11 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
} realvaluetype;
#define REAL_VALUE_TYPE realvaluetype

#else /* no XFmode support */

#if (LONG_DOUBLE_TYPE_SIZE == 128)

#define REAL_IS_NOT_DOUBLE
#define REAL_ARITHMETIC
typedef struct {
  HOST_WIDE_INT r[(19 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
} realvaluetype;
#define REAL_VALUE_TYPE realvaluetype

#else /* not TFmode */

#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
/* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
   but it is not necessarily a host machine double. */
#define REAL_IS_NOT_DOUBLE
typedef struct {
  HOST_WIDE_INT r[(7 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
} realvaluetype;
#define REAL_VALUE_TYPE realvaluetype
#else
/* If host and target formats are compatible, then a REAL_VALUE_TYPE
   is actually a host machine double. */
#define REAL_VALUE_TYPE double
#endif

#endif /* no TFmode support */
#endif /* no XFmode support */

extern int significand_size	PROTO((enum machine_mode));

/* If emulation has been enabled by defining REAL_ARITHMETIC or by
   setting LONG_DOUBLE_TYPE_SIZE to 96 or 128, then define macros so that
   they invoke emulator functions. This will succeed only if the machine
   files have been updated to use these macros in place of any
   references to host machine `double' or `float' types.  */
#ifdef REAL_ARITHMETIC
#undef REAL_ARITHMETIC
#define REAL_ARITHMETIC(value, code, d1, d2) \
  earith (&(value), (code), &(d1), &(d2))

/* Declare functions in real.c. */
extern void earith		PROTO((REAL_VALUE_TYPE *, int,
				       REAL_VALUE_TYPE *, REAL_VALUE_TYPE *));
extern REAL_VALUE_TYPE etrunci	PROTO((REAL_VALUE_TYPE));
extern REAL_VALUE_TYPE etruncui	PROTO((REAL_VALUE_TYPE));
extern REAL_VALUE_TYPE ereal_atof PROTO((char *, enum machine_mode));
extern REAL_VALUE_TYPE ereal_negate PROTO((REAL_VALUE_TYPE));
extern HOST_WIDE_INT efixi	PROTO((REAL_VALUE_TYPE));
extern unsigned HOST_WIDE_INT efixui PROTO((REAL_VALUE_TYPE));
extern void ereal_from_int	PROTO((REAL_VALUE_TYPE *,
				       HOST_WIDE_INT, HOST_WIDE_INT));
extern void ereal_from_uint	PROTO((REAL_VALUE_TYPE *,
				       unsigned HOST_WIDE_INT,
				       unsigned HOST_WIDE_INT));
extern void ereal_to_int	PROTO((HOST_WIDE_INT *, HOST_WIDE_INT *,
				       REAL_VALUE_TYPE));
extern REAL_VALUE_TYPE ereal_ldexp PROTO((REAL_VALUE_TYPE, int));

extern void etartdouble		PROTO((REAL_VALUE_TYPE, long *));
extern void etarldouble		PROTO((REAL_VALUE_TYPE, long *));
extern void etardouble		PROTO((REAL_VALUE_TYPE, long *));
extern long etarsingle		PROTO((REAL_VALUE_TYPE));
extern void ereal_to_decimal	PROTO((REAL_VALUE_TYPE, char *));
extern int ereal_cmp		PROTO((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
extern int ereal_isneg		PROTO((REAL_VALUE_TYPE));
extern REAL_VALUE_TYPE ereal_from_float PROTO((HOST_WIDE_INT));
extern REAL_VALUE_TYPE ereal_from_double PROTO((HOST_WIDE_INT *));

#define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
/* true if x < y : */
#define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
#define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)

/* These return REAL_VALUE_TYPE: */
#define REAL_VALUE_RNDZINT(x) (etrunci (x))
#define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
extern REAL_VALUE_TYPE real_value_truncate ();
#define REAL_VALUE_TRUNCATE(mode, x)  real_value_truncate (mode, x)

/* These return HOST_WIDE_INT: */
/* Convert a floating-point value to integer, rounding toward zero.  */
#define REAL_VALUE_FIX(x) (efixi (x))
/* Convert a floating-point value to unsigned integer, rounding
   toward zero. */
#define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))

#define REAL_VALUE_ATOF ereal_atof
#define REAL_VALUE_NEGATE ereal_negate

#define REAL_VALUE_MINUS_ZERO(x) \
 ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))

#define REAL_VALUE_TO_INT ereal_to_int

/* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0.  */
#define REAL_VALUE_FROM_INT(d, lo, hi) \
  ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi))

#define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi) (ereal_from_uint (&d, lo, hi))

/* IN is a REAL_VALUE_TYPE.  OUT is an array of longs. */
#if LONG_DOUBLE_TYPE_SIZE == 96
#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
#else
#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
#endif
#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))

/* IN is a REAL_VALUE_TYPE.  OUT is a long. */
#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))

/* d is an array of HOST_WIDE_INT that holds a double precision
   value in the target computer's floating point format. */
#define REAL_VALUE_FROM_TARGET_DOUBLE(d)  (ereal_from_double (d))

/* f is a HOST_WIDE_INT containing a single precision target float value. */
#define REAL_VALUE_FROM_TARGET_SINGLE(f)  (ereal_from_float (f))

/* Conversions to decimal ASCII string.  */
#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))

#endif /* REAL_ARITHMETIC defined */

/* **** End of software floating point emulator interface macros **** */
#else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */

/* old interface */
#ifdef REAL_ARITHMETIC
/* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
   when REAL_ARITHMETIC etc. are not defined.  */

/* Now see if the host and target machines use the same format. 
   If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
   reals as doubles because we have no better way in this cross compiler.)
   This turns off various optimizations that can happen when we know the
   compiler's float format matches the target's float format.
   */
#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
#define	REAL_IS_NOT_DOUBLE
#ifndef REAL_VALUE_TYPE
typedef struct {
    HOST_WIDE_INT r[sizeof (double)/sizeof (HOST_WIDE_INT)];
  } realvaluetype;
#define REAL_VALUE_TYPE realvaluetype
#endif /* no REAL_VALUE_TYPE */
#endif /* formats differ */
#endif /* 0 */

#endif /* emulator not used */

/* If we are not cross-compiling, use a `double' to represent the
   floating-point value.  Otherwise, use some other type
   (probably a struct containing an array of longs).  */
#ifndef REAL_VALUE_TYPE
#define REAL_VALUE_TYPE double
#else
#define REAL_IS_NOT_DOUBLE
#endif

#if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT

/* Convert a type `double' value in host format first to a type `float'
   value in host format and then to a single type `long' value which
   is the bitwise equivalent of the `float' value.  */
#ifndef REAL_VALUE_TO_TARGET_SINGLE
#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT)				\
do { float f = (float) (IN);						\
     (OUT) = *(long *) &f;						\
   } while (0)
#endif

/* Convert a type `double' value in host format to a pair of type `long'
   values which is its bitwise equivalent, but put the two words into
   proper word order for the target.  */
#ifndef REAL_VALUE_TO_TARGET_DOUBLE
#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT)				\
do { REAL_VALUE_TYPE in = (IN);  /* Make sure it's not in a register.  */\
     if (HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN)		\
       {								\
	 (OUT)[0] = ((long *) &in)[0];					\
	 (OUT)[1] = ((long *) &in)[1];					\
       }								\
     else								\
       {								\
	 (OUT)[1] = ((long *) &in)[0];					\
	 (OUT)[0] = ((long *) &in)[1];					\
       }								\
   } while (0)
#endif
#endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */

/* In this configuration, double and long double are the same. */
#ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
#endif

/* Compare two floating-point values for equality.  */
#ifndef REAL_VALUES_EQUAL
#define REAL_VALUES_EQUAL(x, y) ((x) == (y))
#endif

/* Compare two floating-point values for less than.  */
#ifndef REAL_VALUES_LESS
#define REAL_VALUES_LESS(x, y) ((x) < (y))
#endif

/* Truncate toward zero to an integer floating-point value.  */
#ifndef REAL_VALUE_RNDZINT
#define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
#endif

/* Truncate toward zero to an unsigned integer floating-point value.  */
#ifndef REAL_VALUE_UNSIGNED_RNDZINT
#define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
#endif

/* Convert a floating-point value to integer, rounding toward zero.  */
#ifndef REAL_VALUE_FIX
#define REAL_VALUE_FIX(x) ((int) (x))
#endif

/* Convert a floating-point value to unsigned integer, rounding
   toward zero. */
#ifndef REAL_VALUE_UNSIGNED_FIX
#define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
#endif

/* Scale X by Y powers of 2.  */
#ifndef REAL_VALUE_LDEXP
#define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
extern double ldexp ();
#endif

/* Convert the string X to a floating-point value.  */
#ifndef REAL_VALUE_ATOF
#if 1
/* Use real.c to convert decimal numbers to binary, ... */
REAL_VALUE_TYPE ereal_atof ();
#define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
#else
/* ... or, if you like the host computer's atof, go ahead and use it: */
#define REAL_VALUE_ATOF(x, s) atof (x)
#if defined (MIPSEL) || defined (MIPSEB)
/* MIPS compiler can't handle parens around the function name.
   This problem *does not* appear to be connected with any
   macro definition for atof.  It does not seem there is one.  */
extern double atof ();
#else
extern double (atof) ();
#endif
#endif
#endif

/* Negate the floating-point value X.  */
#ifndef REAL_VALUE_NEGATE
#define REAL_VALUE_NEGATE(x) (- (x))
#endif

/* Truncate the floating-point value X to mode MODE.  This is correct only
   for the most common case where the host and target have objects of the same
   size and where `float' is SFmode.  */

/* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate.  */
extern REAL_VALUE_TYPE real_value_truncate ();

#ifndef REAL_VALUE_TRUNCATE
#define REAL_VALUE_TRUNCATE(mode, x) \
 (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR	\
  ? (float) (x) : (x))
#endif

/* Determine whether a floating-point value X is infinite. */
#ifndef REAL_VALUE_ISINF
#define REAL_VALUE_ISINF(x) (target_isinf (x))
#endif

/* Determine whether a floating-point value X is a NaN. */
#ifndef REAL_VALUE_ISNAN
#define REAL_VALUE_ISNAN(x) (target_isnan (x))
#endif

/* Determine whether a floating-point value X is negative. */
#ifndef REAL_VALUE_NEGATIVE
#define REAL_VALUE_NEGATIVE(x) (target_negative (x))
#endif

/* Determine whether a floating-point value X is minus 0. */
#ifndef REAL_VALUE_MINUS_ZERO
#define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
#endif
\f
/* Constant real values 0, 1, 2, and -1.  */

extern REAL_VALUE_TYPE dconst0;
extern REAL_VALUE_TYPE dconst1;
extern REAL_VALUE_TYPE dconst2;
extern REAL_VALUE_TYPE dconstm1;

/* Union type used for extracting real values from CONST_DOUBLEs
   or putting them in.  */

union real_extract 
{
  REAL_VALUE_TYPE d;
  HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)];
};

/* For a CONST_DOUBLE:
   The usual two ints that hold the value.
   For a DImode, that is all there are;
    and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
   For a float, the number of ints varies,
    and CONST_DOUBLE_LOW is the one that should come first *in memory*.
    So use &CONST_DOUBLE_LOW(r) as the address of an array of ints.  */
#define CONST_DOUBLE_LOW(r) XWINT (r, 2)
#define CONST_DOUBLE_HIGH(r) XWINT (r, 3)

/* Link for chain of all CONST_DOUBLEs in use in current function.  */
#define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
/* The MEM which represents this CONST_DOUBLE's value in memory,
   or const0_rtx if no MEM has been made for it yet,
   or cc0_rtx if it is not on the chain.  */
#define CONST_DOUBLE_MEM(r) XEXP (r, 0)

/* Function to return a real value (not a tree node)
   from a given integer constant.  */
REAL_VALUE_TYPE real_value_from_int_cst ();

/* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */

#define REAL_VALUE_FROM_CONST_DOUBLE(to, from)		\
do { union real_extract u;				\
     bcopy ((char *) &CONST_DOUBLE_LOW ((from)), (char *) &u, sizeof u); \
     to = u.d; } while (0)

/* Return a CONST_DOUBLE with value R and mode M.  */

#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r,  m)
extern struct rtx_def *immed_real_const_1	PROTO((REAL_VALUE_TYPE,
						       enum machine_mode));


/* Convert a floating point value `r', that can be interpreted
   as a host machine float or double, to a decimal ASCII string `s'
   using printf format string `fmt'.  */
#ifndef REAL_VALUE_TO_DECIMAL
#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
#endif

#endif /* Not REAL_H_INCLUDED */
Commit	Line	Data
0694b47c	1	/* Front-end tree definitions for GNU compiler.
fca04441	2	Copyright (C) 1989, 1991, 1994 Free Software Foundation, Inc.
0694b47c RS	3
	4	This file is part of GNU CC.
	5
	6	GNU CC is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2, or (at your option)
	9	any later version.
	10
	11	GNU CC is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with GNU CC; see the file COPYING. If not, write to
e99215a3 RK	18	the Free Software Foundation, 59 Temple Place - Suite 330,
e99215a3 RK	19	Boston, MA 02111-1307, USA. */
0694b47c RS	20
	21	#ifndef REAL_H_INCLUDED
	22	#define REAL_H_INCLUDED
	23
	24	/* Define codes for all the float formats that we know of. */
	25	#define UNKNOWN_FLOAT_FORMAT 0
	26	#define IEEE_FLOAT_FORMAT 1
	27	#define VAX_FLOAT_FORMAT 2
fd76a739	28	#define IBM_FLOAT_FORMAT 3
0694b47c RS	29
	30	/* Default to IEEE float if not specified. Nearly all machines use it. */
	31
	32	#ifndef TARGET_FLOAT_FORMAT
	33	#define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT
	34	#endif
	35
	36	#ifndef HOST_FLOAT_FORMAT
	37	#define HOST_FLOAT_FORMAT IEEE_FLOAT_FORMAT
	38	#endif
	39
	40	#if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
	41	#define REAL_INFINITY
	42	#endif
	43
91d61207 RK	44	/* If FLOAT_WORDS_BIG_ENDIAN and HOST_FLOAT_WORDS_BIG_ENDIAN are not defined
	45	in the header files, then this implies the word-endianness is the same as
	46	for integers. */
	47
	48	/* This is defined 0 or 1, like WORDS_BIG_ENDIAN. */
	49	#ifndef FLOAT_WORDS_BIG_ENDIAN
	50	#define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
	51	#endif
	52
	53	/* This is defined 0 or 1, unlike HOST_WORDS_BIG_ENDIAN. */
	54	#ifndef HOST_FLOAT_WORDS_BIG_ENDIAN
	55	#ifdef HOST_WORDS_BIG_ENDIAN
	56	#define HOST_FLOAT_WORDS_BIG_ENDIAN 1
	57	#else
	58	#define HOST_FLOAT_WORDS_BIG_ENDIAN 0
	59	#endif
	60	#endif
	61
fd76a739 RS	62	/* Defining REAL_ARITHMETIC invokes a floating point emulator
	63	that can produce a target machine format differing by more
	64	than just endian-ness from the host's format. The emulator
	65	is also used to support extended real XFmode. */
	66	#ifndef LONG_DOUBLE_TYPE_SIZE
	67	#define LONG_DOUBLE_TYPE_SIZE 64
	68	#endif
7bb5d01e JW	69	#if (LONG_DOUBLE_TYPE_SIZE == 96) \|\| (LONG_DOUBLE_TYPE_SIZE == 128)
	70	#ifndef REAL_ARITHMETIC
	71	#define REAL_ARITHMETIC
	72	#endif
	73	#endif
	74	#ifdef REAL_ARITHMETIC
fd76a739 RS	75	/* ** Start of software floating point emulator interface macros ** */
	76
	77	/* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE
	78	has been defined to be 96 in the tm.h machine file. */
	79	#if (LONG_DOUBLE_TYPE_SIZE == 96)
	80	#define REAL_IS_NOT_DOUBLE
	81	#define REAL_ARITHMETIC
	82	typedef struct {
	83	HOST_WIDE_INT r[(11 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
	84	} realvaluetype;
	85	#define REAL_VALUE_TYPE realvaluetype
	86
	87	#else /* no XFmode support */
	88
7bb5d01e JW	89	#if (LONG_DOUBLE_TYPE_SIZE == 128)
	90
	91	#define REAL_IS_NOT_DOUBLE
	92	#define REAL_ARITHMETIC
	93	typedef struct {
	94	HOST_WIDE_INT r[(19 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
	95	} realvaluetype;
	96	#define REAL_VALUE_TYPE realvaluetype
	97
	98	#else /* not TFmode */
	99
fd76a739 RS	100	#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
	101	/* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
	102	but it is not necessarily a host machine double. */
	103	#define REAL_IS_NOT_DOUBLE
	104	typedef struct {
	105	HOST_WIDE_INT r[(7 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
	106	} realvaluetype;
	107	#define REAL_VALUE_TYPE realvaluetype
	108	#else
	109	/* If host and target formats are compatible, then a REAL_VALUE_TYPE
	110	is actually a host machine double. */
	111	#define REAL_VALUE_TYPE double
	112	#endif
7bb5d01e JW	113
7bb5d01e JW	114	#endif /* no TFmode support */
fd76a739 RS	115	#endif /* no XFmode support */
fd76a739 RS	116
84f9b8e9 RK	117	extern int significand_size PROTO((enum machine_mode));
84f9b8e9 RK	118
fd76a739	119	/* If emulation has been enabled by defining REAL_ARITHMETIC or by
7bb5d01e	120	setting LONG_DOUBLE_TYPE_SIZE to 96 or 128, then define macros so that
fd76a739 RS	121	they invoke emulator functions. This will succeed only if the machine
	122	files have been updated to use these macros in place of any
	123	references to host machine `double' or `float' types. */
	124	#ifdef REAL_ARITHMETIC
	125	#undef REAL_ARITHMETIC
	126	#define REAL_ARITHMETIC(value, code, d1, d2) \
	127	earith (&(value), (code), &(d1), &(d2))
	128
fca04441 RK	129	/* Declare functions in real.c. */
	130	extern void earith PROTO((REAL_VALUE_TYPE *, int,
	131	REAL_VALUE_TYPE , REAL_VALUE_TYPE ));
	132	extern REAL_VALUE_TYPE etrunci PROTO((REAL_VALUE_TYPE));
	133	extern REAL_VALUE_TYPE etruncui PROTO((REAL_VALUE_TYPE));
	134	extern REAL_VALUE_TYPE ereal_atof PROTO((char *, enum machine_mode));
	135	extern REAL_VALUE_TYPE ereal_negate PROTO((REAL_VALUE_TYPE));
	136	extern HOST_WIDE_INT efixi PROTO((REAL_VALUE_TYPE));
	137	extern unsigned HOST_WIDE_INT efixui PROTO((REAL_VALUE_TYPE));
	138	extern void ereal_from_int PROTO((REAL_VALUE_TYPE *,
	139	HOST_WIDE_INT, HOST_WIDE_INT));
	140	extern void ereal_from_uint PROTO((REAL_VALUE_TYPE *,
	141	unsigned HOST_WIDE_INT,
	142	unsigned HOST_WIDE_INT));
	143	extern void ereal_to_int PROTO((HOST_WIDE_INT , HOST_WIDE_INT ,
	144	REAL_VALUE_TYPE));
	145	extern REAL_VALUE_TYPE ereal_ldexp PROTO((REAL_VALUE_TYPE, int));
	146
	147	extern void etartdouble PROTO((REAL_VALUE_TYPE, long *));
	148	extern void etarldouble PROTO((REAL_VALUE_TYPE, long *));
	149	extern void etardouble PROTO((REAL_VALUE_TYPE, long *));
	150	extern long etarsingle PROTO((REAL_VALUE_TYPE));
	151	extern void ereal_to_decimal PROTO((REAL_VALUE_TYPE, char *));
	152	extern int ereal_cmp PROTO((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
	153	extern int ereal_isneg PROTO((REAL_VALUE_TYPE));
403cd5d7 RK	154	extern REAL_VALUE_TYPE ereal_from_float PROTO((HOST_WIDE_INT));
403cd5d7 RK	155	extern REAL_VALUE_TYPE ereal_from_double PROTO((HOST_WIDE_INT *));
fd76a739 RS	156
	157	#define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
	158	/* true if x < y : */
265b1bae	159	#define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
fd76a739 RS	160	#define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
	161
	162	/* These return REAL_VALUE_TYPE: */
	163	#define REAL_VALUE_RNDZINT(x) (etrunci (x))
	164	#define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
	165	extern REAL_VALUE_TYPE real_value_truncate ();
	166	#define REAL_VALUE_TRUNCATE(mode, x) real_value_truncate (mode, x)
	167
91d61207	168	/* These return HOST_WIDE_INT: */
7bb5d01e JW	169	/* Convert a floating-point value to integer, rounding toward zero. */
	170	#define REAL_VALUE_FIX(x) (efixi (x))
	171	/* Convert a floating-point value to unsigned integer, rounding
	172	toward zero. */
	173	#define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
fd76a739 RS	174
	175	#define REAL_VALUE_ATOF ereal_atof
	176	#define REAL_VALUE_NEGATE ereal_negate
	177
	178	#define REAL_VALUE_MINUS_ZERO(x) \
	179	((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
	180
	181	#define REAL_VALUE_TO_INT ereal_to_int
91d61207 RK	182
	183	/* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0. */
	184	#define REAL_VALUE_FROM_INT(d, lo, hi) \
	185	ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi))
	186
	187	#define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi) (ereal_from_uint (&d, lo, hi))
fd76a739 RS	188
fd76a739 RS	189	/* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
7bb5d01e	190	#if LONG_DOUBLE_TYPE_SIZE == 96
fd76a739	191	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
7bb5d01e JW	192	#else
	193	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
	194	#endif
fd76a739	195	#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
7bb5d01e	196
fd76a739 RS	197	/* IN is a REAL_VALUE_TYPE. OUT is a long. */
fd76a739 RS	198	#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
7bb5d01e	199
403cd5d7 RK	200	/* d is an array of HOST_WIDE_INT that holds a double precision
403cd5d7 RK	201	value in the target computer's floating point format. */
7bb5d01e JW	202	#define REAL_VALUE_FROM_TARGET_DOUBLE(d) (ereal_from_double (d))
7bb5d01e JW	203
403cd5d7	204	/* f is a HOST_WIDE_INT containing a single precision target float value. */
543758c6	205	#define REAL_VALUE_FROM_TARGET_SINGLE(f) (ereal_from_float (f))
fd76a739 RS	206
	207	/* Conversions to decimal ASCII string. */
	208	#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
	209
	210	#endif /* REAL_ARITHMETIC defined */
	211
	212	/* ** End of software floating point emulator interface macros ** */
7bb5d01e	213	#else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
fd76a739 RS	214
fd76a739 RS	215	/* old interface */
0694b47c RS	216	#ifdef REAL_ARITHMETIC
	217	/* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
	218	when REAL_ARITHMETIC etc. are not defined. */
	219
	220	/* Now see if the host and target machines use the same format.
	221	If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
	222	reals as doubles because we have no better way in this cross compiler.)
	223	This turns off various optimizations that can happen when we know the
	224	compiler's float format matches the target's float format.
	225	*/
	226	#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
	227	#define REAL_IS_NOT_DOUBLE
	228	#ifndef REAL_VALUE_TYPE
fd76a739 RS	229	typedef struct {
	230	HOST_WIDE_INT r[sizeof (double)/sizeof (HOST_WIDE_INT)];
	231	} realvaluetype;
	232	#define REAL_VALUE_TYPE realvaluetype
0694b47c RS	233	#endif /* no REAL_VALUE_TYPE */
	234	#endif /* formats differ */
	235	#endif /* 0 */
	236
fd76a739 RS	237	#endif /* emulator not used */
fd76a739 RS	238
0694b47c RS	239	/* If we are not cross-compiling, use a `double' to represent the
	240	floating-point value. Otherwise, use some other type
	241	(probably a struct containing an array of longs). */
	242	#ifndef REAL_VALUE_TYPE
	243	#define REAL_VALUE_TYPE double
	244	#else
	245	#define REAL_IS_NOT_DOUBLE
	246	#endif
	247
f9250555 RS	248	#if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
	249
	250	/* Convert a type `double' value in host format first to a type `float'
	251	value in host format and then to a single type `long' value which
	252	is the bitwise equivalent of the `float' value. */
fd76a739	253	#ifndef REAL_VALUE_TO_TARGET_SINGLE
f9250555 RS	254	#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
	255	do { float f = (float) (IN); \
	256	(OUT) = (long ) &f; \
fd76a739 RS	257	} while (0)
fd76a739 RS	258	#endif
f9250555 RS	259
	260	/* Convert a type `double' value in host format to a pair of type `long'
	261	values which is its bitwise equivalent, but put the two words into
	262	proper word order for the target. */
fd76a739	263	#ifndef REAL_VALUE_TO_TARGET_DOUBLE
f9250555 RS	264	#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
f9250555 RS	265	do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\
f76b9db2 ILT	266	if (HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN) \
	267	{ \
	268	(OUT)[0] = ((long *) &in)[0]; \
	269	(OUT)[1] = ((long *) &in)[1]; \
	270	} \
	271	else \
	272	{ \
	273	(OUT)[1] = ((long *) &in)[0]; \
	274	(OUT)[0] = ((long *) &in)[1]; \
	275	} \
f9250555	276	} while (0)
fd76a739	277	#endif
f9250555 RS	278	#endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
f9250555 RS	279
fd76a739 RS	280	/* In this configuration, double and long double are the same. */
	281	#ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
	282	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
	283	#endif
	284
0694b47c RS	285	/* Compare two floating-point values for equality. */
0694b47c RS	286	#ifndef REAL_VALUES_EQUAL
fd76a739	287	#define REAL_VALUES_EQUAL(x, y) ((x) == (y))
0694b47c RS	288	#endif
	289
	290	/* Compare two floating-point values for less than. */
	291	#ifndef REAL_VALUES_LESS
fd76a739	292	#define REAL_VALUES_LESS(x, y) ((x) < (y))
0694b47c RS	293	#endif
0694b47c RS	294
fd76a739 RS	295	/* Truncate toward zero to an integer floating-point value. */
	296	#ifndef REAL_VALUE_RNDZINT
	297	#define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
0694b47c RS	298	#endif
0694b47c RS	299
fd76a739 RS	300	/* Truncate toward zero to an unsigned integer floating-point value. */
	301	#ifndef REAL_VALUE_UNSIGNED_RNDZINT
	302	#define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
0694b47c RS	303	#endif
0694b47c RS	304
7bb5d01e	305	/* Convert a floating-point value to integer, rounding toward zero. */
0694b47c RS	306	#ifndef REAL_VALUE_FIX
	307	#define REAL_VALUE_FIX(x) ((int) (x))
	308	#endif
	309
7bb5d01e JW	310	/* Convert a floating-point value to unsigned integer, rounding
7bb5d01e JW	311	toward zero. */
0694b47c RS	312	#ifndef REAL_VALUE_UNSIGNED_FIX
	313	#define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
	314	#endif
	315
	316	/* Scale X by Y powers of 2. */
	317	#ifndef REAL_VALUE_LDEXP
fd76a739	318	#define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
0694b47c RS	319	extern double ldexp ();
	320	#endif
	321
	322	/* Convert the string X to a floating-point value. */
	323	#ifndef REAL_VALUE_ATOF
fd76a739 RS	324	#if 1
	325	/* Use real.c to convert decimal numbers to binary, ... */
	326	REAL_VALUE_TYPE ereal_atof ();
	327	#define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
	328	#else
	329	/* ... or, if you like the host computer's atof, go ahead and use it: */
	330	#define REAL_VALUE_ATOF(x, s) atof (x)
0694b47c RS	331	#if defined (MIPSEL) \|\| defined (MIPSEB)
	332	/* MIPS compiler can't handle parens around the function name.
	333	This problem does not appear to be connected with any
	334	macro definition for atof. It does not seem there is one. */
	335	extern double atof ();
	336	#else
	337	extern double (atof) ();
	338	#endif
	339	#endif
fd76a739	340	#endif
0694b47c RS	341
	342	/* Negate the floating-point value X. */
	343	#ifndef REAL_VALUE_NEGATE
	344	#define REAL_VALUE_NEGATE(x) (- (x))
	345	#endif
	346
	347	/* Truncate the floating-point value X to mode MODE. This is correct only
	348	for the most common case where the host and target have objects of the same
	349	size and where `float' is SFmode. */
	350
5352b11a RS	351	/* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate. */
	352	extern REAL_VALUE_TYPE real_value_truncate ();
	353
0694b47c RS	354	#ifndef REAL_VALUE_TRUNCATE
0694b47c RS	355	#define REAL_VALUE_TRUNCATE(mode, x) \
161ca48c RS	356	(GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \
161ca48c RS	357	? (float) (x) : (x))
0694b47c RS	358	#endif
	359
	360	/* Determine whether a floating-point value X is infinite. */
	361	#ifndef REAL_VALUE_ISINF
	362	#define REAL_VALUE_ISINF(x) (target_isinf (x))
	363	#endif
	364
3dd4b517 TW	365	/* Determine whether a floating-point value X is a NaN. */
	366	#ifndef REAL_VALUE_ISNAN
	367	#define REAL_VALUE_ISNAN(x) (target_isnan (x))
	368	#endif
	369
11030a60 RS	370	/* Determine whether a floating-point value X is negative. */
	371	#ifndef REAL_VALUE_NEGATIVE
	372	#define REAL_VALUE_NEGATIVE(x) (target_negative (x))
	373	#endif
	374
0694b47c RS	375	/* Determine whether a floating-point value X is minus 0. */
0694b47c RS	376	#ifndef REAL_VALUE_MINUS_ZERO
11030a60	377	#define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
0694b47c RS	378	#endif
	379	\f
	380	/* Constant real values 0, 1, 2, and -1. */
	381
	382	extern REAL_VALUE_TYPE dconst0;
	383	extern REAL_VALUE_TYPE dconst1;
	384	extern REAL_VALUE_TYPE dconst2;
	385	extern REAL_VALUE_TYPE dconstm1;
	386
	387	/* Union type used for extracting real values from CONST_DOUBLEs
	388	or putting them in. */
	389
	390	union real_extract
	391	{
	392	REAL_VALUE_TYPE d;
3245eea0	393	HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)];
0694b47c RS	394	};
	395
	396	/* For a CONST_DOUBLE:
	397	The usual two ints that hold the value.
	398	For a DImode, that is all there are;
	399	and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
	400	For a float, the number of ints varies,
	401	and CONST_DOUBLE_LOW is the one that should come first in memory.
	402	So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
3245eea0 CH	403	#define CONST_DOUBLE_LOW(r) XWINT (r, 2)
3245eea0 CH	404	#define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
0694b47c RS	405
	406	/* Link for chain of all CONST_DOUBLEs in use in current function. */
	407	#define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
	408	/* The MEM which represents this CONST_DOUBLE's value in memory,
	409	or const0_rtx if no MEM has been made for it yet,
	410	or cc0_rtx if it is not on the chain. */
	411	#define CONST_DOUBLE_MEM(r) XEXP (r, 0)
	412
	413	/* Function to return a real value (not a tree node)
	414	from a given integer constant. */
	415	REAL_VALUE_TYPE real_value_from_int_cst ();
	416
	417	/* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
	418
	419	#define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
	420	do { union real_extract u; \
4c9a05bc	421	bcopy ((char ) &CONST_DOUBLE_LOW ((from)), (char ) &u, sizeof u); \
0694b47c RS	422	to = u.d; } while (0)
	423
	424	/* Return a CONST_DOUBLE with value R and mode M. */
	425
fd76a739	426	#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r, m)
fca04441 RK	427	extern struct rtx_def *immed_real_const_1 PROTO((REAL_VALUE_TYPE,
	428	enum machine_mode));
	429
fd76a739 RS	430
	431	/* Convert a floating point value `r', that can be interpreted
	432	as a host machine float or double, to a decimal ASCII string `s'
	433	using printf format string `fmt'. */
	434	#ifndef REAL_VALUE_TO_DECIMAL
	435	#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
	436	#endif
0694b47c RS	437
0694b47c RS	438	#endif /* Not REAL_H_INCLUDED */