[gcc.git] / gcc / real.h

/* Front-end tree definitions for GNU compiler.
   Copyright (C) 1989, 1991, 1994, 1996 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,
				       enum machine_mode));
extern void ereal_from_uint	PROTO((REAL_VALUE_TYPE *,
				       unsigned HOST_WIDE_INT,
				       unsigned HOST_WIDE_INT,
				       enum machine_mode));
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, mode) \
  ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi), mode)

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

/* 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

/* Replace R by 1/R in the given machine mode, if the result is exact.  */
extern int exact_real_inverse PROTO((enum machine_mode, REAL_VALUE_TYPE *));

#endif /* Not REAL_H_INCLUDED */
Commit	Line	Data
0694b47c	1	/* Front-end tree definitions for GNU compiler.
7efc32fd	2	Copyright (C) 1989, 1991, 1994, 1996 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 *,
7efc32fd RK	139	HOST_WIDE_INT, HOST_WIDE_INT,
7efc32fd RK	140	enum machine_mode));
fca04441 RK	141	extern void ereal_from_uint PROTO((REAL_VALUE_TYPE *,
fca04441 RK	142	unsigned HOST_WIDE_INT,
7efc32fd RK	143	unsigned HOST_WIDE_INT,
7efc32fd RK	144	enum machine_mode));
fca04441 RK	145	extern void ereal_to_int PROTO((HOST_WIDE_INT , HOST_WIDE_INT ,
	146	REAL_VALUE_TYPE));
	147	extern REAL_VALUE_TYPE ereal_ldexp PROTO((REAL_VALUE_TYPE, int));
	148
	149	extern void etartdouble PROTO((REAL_VALUE_TYPE, long *));
	150	extern void etarldouble PROTO((REAL_VALUE_TYPE, long *));
	151	extern void etardouble PROTO((REAL_VALUE_TYPE, long *));
	152	extern long etarsingle PROTO((REAL_VALUE_TYPE));
	153	extern void ereal_to_decimal PROTO((REAL_VALUE_TYPE, char *));
	154	extern int ereal_cmp PROTO((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
	155	extern int ereal_isneg PROTO((REAL_VALUE_TYPE));
403cd5d7 RK	156	extern REAL_VALUE_TYPE ereal_from_float PROTO((HOST_WIDE_INT));
403cd5d7 RK	157	extern REAL_VALUE_TYPE ereal_from_double PROTO((HOST_WIDE_INT *));
fd76a739 RS	158
	159	#define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
	160	/* true if x < y : */
265b1bae	161	#define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
fd76a739 RS	162	#define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
	163
	164	/* These return REAL_VALUE_TYPE: */
	165	#define REAL_VALUE_RNDZINT(x) (etrunci (x))
	166	#define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
	167	extern REAL_VALUE_TYPE real_value_truncate ();
	168	#define REAL_VALUE_TRUNCATE(mode, x) real_value_truncate (mode, x)
	169
91d61207	170	/* These return HOST_WIDE_INT: */
7bb5d01e JW	171	/* Convert a floating-point value to integer, rounding toward zero. */
	172	#define REAL_VALUE_FIX(x) (efixi (x))
	173	/* Convert a floating-point value to unsigned integer, rounding
	174	toward zero. */
	175	#define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
fd76a739 RS	176
	177	#define REAL_VALUE_ATOF ereal_atof
	178	#define REAL_VALUE_NEGATE ereal_negate
	179
	180	#define REAL_VALUE_MINUS_ZERO(x) \
	181	((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
	182
	183	#define REAL_VALUE_TO_INT ereal_to_int
91d61207 RK	184
91d61207 RK	185	/* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0. */
7efc32fd RK	186	#define REAL_VALUE_FROM_INT(d, lo, hi, mode) \
7efc32fd RK	187	ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi), mode)
91d61207	188
7efc32fd RK	189	#define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi, mode) \
7efc32fd RK	190	ereal_from_uint (&d, lo, hi, mode)
fd76a739 RS	191
fd76a739 RS	192	/* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
7bb5d01e	193	#if LONG_DOUBLE_TYPE_SIZE == 96
fd76a739	194	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
7bb5d01e JW	195	#else
	196	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
	197	#endif
fd76a739	198	#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
7bb5d01e	199
fd76a739 RS	200	/* IN is a REAL_VALUE_TYPE. OUT is a long. */
fd76a739 RS	201	#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
7bb5d01e	202
403cd5d7 RK	203	/* d is an array of HOST_WIDE_INT that holds a double precision
403cd5d7 RK	204	value in the target computer's floating point format. */
7bb5d01e JW	205	#define REAL_VALUE_FROM_TARGET_DOUBLE(d) (ereal_from_double (d))
7bb5d01e JW	206
403cd5d7	207	/* f is a HOST_WIDE_INT containing a single precision target float value. */
543758c6	208	#define REAL_VALUE_FROM_TARGET_SINGLE(f) (ereal_from_float (f))
fd76a739 RS	209
	210	/* Conversions to decimal ASCII string. */
	211	#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
	212
	213	#endif /* REAL_ARITHMETIC defined */
	214
	215	/* ** End of software floating point emulator interface macros ** */
7bb5d01e	216	#else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
fd76a739 RS	217
fd76a739 RS	218	/* old interface */
0694b47c RS	219	#ifdef REAL_ARITHMETIC
	220	/* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
	221	when REAL_ARITHMETIC etc. are not defined. */
	222
	223	/* Now see if the host and target machines use the same format.
	224	If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
	225	reals as doubles because we have no better way in this cross compiler.)
	226	This turns off various optimizations that can happen when we know the
	227	compiler's float format matches the target's float format.
	228	*/
	229	#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
	230	#define REAL_IS_NOT_DOUBLE
	231	#ifndef REAL_VALUE_TYPE
fd76a739 RS	232	typedef struct {
	233	HOST_WIDE_INT r[sizeof (double)/sizeof (HOST_WIDE_INT)];
	234	} realvaluetype;
	235	#define REAL_VALUE_TYPE realvaluetype
0694b47c RS	236	#endif /* no REAL_VALUE_TYPE */
	237	#endif /* formats differ */
	238	#endif /* 0 */
	239
fd76a739 RS	240	#endif /* emulator not used */
fd76a739 RS	241
0694b47c RS	242	/* If we are not cross-compiling, use a `double' to represent the
	243	floating-point value. Otherwise, use some other type
	244	(probably a struct containing an array of longs). */
	245	#ifndef REAL_VALUE_TYPE
	246	#define REAL_VALUE_TYPE double
	247	#else
	248	#define REAL_IS_NOT_DOUBLE
	249	#endif
	250
f9250555 RS	251	#if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
	252
	253	/* Convert a type `double' value in host format first to a type `float'
	254	value in host format and then to a single type `long' value which
	255	is the bitwise equivalent of the `float' value. */
fd76a739	256	#ifndef REAL_VALUE_TO_TARGET_SINGLE
f9250555 RS	257	#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
	258	do { float f = (float) (IN); \
	259	(OUT) = (long ) &f; \
fd76a739 RS	260	} while (0)
fd76a739 RS	261	#endif
f9250555 RS	262
	263	/* Convert a type `double' value in host format to a pair of type `long'
	264	values which is its bitwise equivalent, but put the two words into
	265	proper word order for the target. */
fd76a739	266	#ifndef REAL_VALUE_TO_TARGET_DOUBLE
f9250555 RS	267	#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
f9250555 RS	268	do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\
f76b9db2 ILT	269	if (HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN) \
	270	{ \
	271	(OUT)[0] = ((long *) &in)[0]; \
	272	(OUT)[1] = ((long *) &in)[1]; \
	273	} \
	274	else \
	275	{ \
	276	(OUT)[1] = ((long *) &in)[0]; \
	277	(OUT)[0] = ((long *) &in)[1]; \
	278	} \
f9250555	279	} while (0)
fd76a739	280	#endif
f9250555 RS	281	#endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
f9250555 RS	282
fd76a739 RS	283	/* In this configuration, double and long double are the same. */
	284	#ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
	285	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
	286	#endif
	287
0694b47c RS	288	/* Compare two floating-point values for equality. */
0694b47c RS	289	#ifndef REAL_VALUES_EQUAL
fd76a739	290	#define REAL_VALUES_EQUAL(x, y) ((x) == (y))
0694b47c RS	291	#endif
	292
	293	/* Compare two floating-point values for less than. */
	294	#ifndef REAL_VALUES_LESS
fd76a739	295	#define REAL_VALUES_LESS(x, y) ((x) < (y))
0694b47c RS	296	#endif
0694b47c RS	297
fd76a739 RS	298	/* Truncate toward zero to an integer floating-point value. */
	299	#ifndef REAL_VALUE_RNDZINT
	300	#define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
0694b47c RS	301	#endif
0694b47c RS	302
fd76a739 RS	303	/* Truncate toward zero to an unsigned integer floating-point value. */
	304	#ifndef REAL_VALUE_UNSIGNED_RNDZINT
	305	#define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
0694b47c RS	306	#endif
0694b47c RS	307
7bb5d01e	308	/* Convert a floating-point value to integer, rounding toward zero. */
0694b47c RS	309	#ifndef REAL_VALUE_FIX
	310	#define REAL_VALUE_FIX(x) ((int) (x))
	311	#endif
	312
7bb5d01e JW	313	/* Convert a floating-point value to unsigned integer, rounding
7bb5d01e JW	314	toward zero. */
0694b47c RS	315	#ifndef REAL_VALUE_UNSIGNED_FIX
	316	#define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
	317	#endif
	318
	319	/* Scale X by Y powers of 2. */
	320	#ifndef REAL_VALUE_LDEXP
fd76a739	321	#define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
0694b47c RS	322	extern double ldexp ();
	323	#endif
	324
	325	/* Convert the string X to a floating-point value. */
	326	#ifndef REAL_VALUE_ATOF
fd76a739 RS	327	#if 1
	328	/* Use real.c to convert decimal numbers to binary, ... */
	329	REAL_VALUE_TYPE ereal_atof ();
	330	#define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
	331	#else
	332	/* ... or, if you like the host computer's atof, go ahead and use it: */
	333	#define REAL_VALUE_ATOF(x, s) atof (x)
0694b47c RS	334	#if defined (MIPSEL) \|\| defined (MIPSEB)
	335	/* MIPS compiler can't handle parens around the function name.
	336	This problem does not appear to be connected with any
	337	macro definition for atof. It does not seem there is one. */
	338	extern double atof ();
	339	#else
	340	extern double (atof) ();
	341	#endif
	342	#endif
fd76a739	343	#endif
0694b47c RS	344
	345	/* Negate the floating-point value X. */
	346	#ifndef REAL_VALUE_NEGATE
	347	#define REAL_VALUE_NEGATE(x) (- (x))
	348	#endif
	349
	350	/* Truncate the floating-point value X to mode MODE. This is correct only
	351	for the most common case where the host and target have objects of the same
	352	size and where `float' is SFmode. */
	353
5352b11a RS	354	/* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate. */
	355	extern REAL_VALUE_TYPE real_value_truncate ();
	356
0694b47c RS	357	#ifndef REAL_VALUE_TRUNCATE
0694b47c RS	358	#define REAL_VALUE_TRUNCATE(mode, x) \
161ca48c RS	359	(GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \
161ca48c RS	360	? (float) (x) : (x))
0694b47c RS	361	#endif
	362
	363	/* Determine whether a floating-point value X is infinite. */
	364	#ifndef REAL_VALUE_ISINF
	365	#define REAL_VALUE_ISINF(x) (target_isinf (x))
	366	#endif
	367
3dd4b517 TW	368	/* Determine whether a floating-point value X is a NaN. */
	369	#ifndef REAL_VALUE_ISNAN
	370	#define REAL_VALUE_ISNAN(x) (target_isnan (x))
	371	#endif
	372
11030a60 RS	373	/* Determine whether a floating-point value X is negative. */
	374	#ifndef REAL_VALUE_NEGATIVE
	375	#define REAL_VALUE_NEGATIVE(x) (target_negative (x))
	376	#endif
	377
0694b47c RS	378	/* Determine whether a floating-point value X is minus 0. */
0694b47c RS	379	#ifndef REAL_VALUE_MINUS_ZERO
11030a60	380	#define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
0694b47c RS	381	#endif
	382	\f
	383	/* Constant real values 0, 1, 2, and -1. */
	384
	385	extern REAL_VALUE_TYPE dconst0;
	386	extern REAL_VALUE_TYPE dconst1;
	387	extern REAL_VALUE_TYPE dconst2;
	388	extern REAL_VALUE_TYPE dconstm1;
	389
	390	/* Union type used for extracting real values from CONST_DOUBLEs
	391	or putting them in. */
	392
	393	union real_extract
	394	{
	395	REAL_VALUE_TYPE d;
3245eea0	396	HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)];
0694b47c RS	397	};
	398
	399	/* For a CONST_DOUBLE:
	400	The usual two ints that hold the value.
	401	For a DImode, that is all there are;
	402	and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
	403	For a float, the number of ints varies,
	404	and CONST_DOUBLE_LOW is the one that should come first in memory.
	405	So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
3245eea0 CH	406	#define CONST_DOUBLE_LOW(r) XWINT (r, 2)
3245eea0 CH	407	#define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
0694b47c RS	408
	409	/* Link for chain of all CONST_DOUBLEs in use in current function. */
	410	#define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
	411	/* The MEM which represents this CONST_DOUBLE's value in memory,
	412	or const0_rtx if no MEM has been made for it yet,
	413	or cc0_rtx if it is not on the chain. */
	414	#define CONST_DOUBLE_MEM(r) XEXP (r, 0)
	415
	416	/* Function to return a real value (not a tree node)
	417	from a given integer constant. */
	418	REAL_VALUE_TYPE real_value_from_int_cst ();
	419
	420	/* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
	421
	422	#define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
	423	do { union real_extract u; \
4c9a05bc	424	bcopy ((char ) &CONST_DOUBLE_LOW ((from)), (char ) &u, sizeof u); \
0694b47c RS	425	to = u.d; } while (0)
	426
	427	/* Return a CONST_DOUBLE with value R and mode M. */
	428
fd76a739	429	#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r, m)
fca04441 RK	430	extern struct rtx_def *immed_real_const_1 PROTO((REAL_VALUE_TYPE,
	431	enum machine_mode));
	432
fd76a739 RS	433
	434	/* Convert a floating point value `r', that can be interpreted
	435	as a host machine float or double, to a decimal ASCII string `s'
	436	using printf format string `fmt'. */
	437	#ifndef REAL_VALUE_TO_DECIMAL
	438	#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
	439	#endif
0694b47c	440
ebc8186b RK	441	/* Replace R by 1/R in the given machine mode, if the result is exact. */
	442	extern int exact_real_inverse PROTO((enum machine_mode, REAL_VALUE_TYPE *));
	443
0694b47c	444	#endif /* Not REAL_H_INCLUDED */