[thirdparty/gcc.git] / gcc / real.h

/* Definitions of floating-point access for GNU compiler.
   Copyright (C) 1989, 1991, 1994, 1996, 1997 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_unto_float PROTO((long));
extern REAL_VALUE_TYPE ereal_unto_double PROTO((long *));
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	PROTO ((enum machine_mode,
							REAL_VALUE_TYPE));
#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)))

/* Inverse of REAL_VALUE_TO_TARGET_DOUBLE. */
#define REAL_VALUE_UNTO_TARGET_DOUBLE(d)  (ereal_unto_double (d))

/* Inverse of REAL_VALUE_TO_TARGET_SINGLE. */
#define REAL_VALUE_UNTO_TARGET_SINGLE(f)  (ereal_unto_float (f))

/* 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 PROTO((enum machine_mode, REAL_VALUE_TYPE));

#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

extern int target_isnan			PROTO ((REAL_VALUE_TYPE));
extern int target_isinf			PROTO ((REAL_VALUE_TYPE));
extern int target_negative		PROTO ((REAL_VALUE_TYPE));

/* 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)

/* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */
/* Function to return a real value (not a tree node)
   from a given integer constant.  */
union tree_node;
REAL_VALUE_TYPE real_value_from_int_cst	PROTO ((union tree_node *,
						union tree_node *));

#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 *));

extern void debug_real			PROTO ((REAL_VALUE_TYPE));

/* In varasm.c */
extern void assemble_real		PROTO ((REAL_VALUE_TYPE,
						enum machine_mode));
#endif /* Not REAL_H_INCLUDED */
Commit	Line	Data
e9a25f70 JL	1	/* Definitions of floating-point access for GNU compiler.
e9a25f70 JL	2	Copyright (C) 1989, 1991, 1994, 1996, 1997 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));
7bb6fbd1 JL	156	extern REAL_VALUE_TYPE ereal_unto_float PROTO((long));
7bb6fbd1 JL	157	extern REAL_VALUE_TYPE ereal_unto_double PROTO((long *));
403cd5d7 RK	158	extern REAL_VALUE_TYPE ereal_from_float PROTO((HOST_WIDE_INT));
403cd5d7 RK	159	extern REAL_VALUE_TYPE ereal_from_double PROTO((HOST_WIDE_INT *));
fd76a739 RS	160
	161	#define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
	162	/* true if x < y : */
265b1bae	163	#define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
fd76a739 RS	164	#define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
	165
	166	/* These return REAL_VALUE_TYPE: */
	167	#define REAL_VALUE_RNDZINT(x) (etrunci (x))
	168	#define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
e9576d2c L	169	extern REAL_VALUE_TYPE real_value_truncate PROTO ((enum machine_mode,
e9576d2c L	170	REAL_VALUE_TYPE));
fd76a739 RS	171	#define REAL_VALUE_TRUNCATE(mode, x) real_value_truncate (mode, x)
fd76a739 RS	172
91d61207	173	/* These return HOST_WIDE_INT: */
7bb5d01e JW	174	/* Convert a floating-point value to integer, rounding toward zero. */
	175	#define REAL_VALUE_FIX(x) (efixi (x))
	176	/* Convert a floating-point value to unsigned integer, rounding
	177	toward zero. */
	178	#define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
fd76a739 RS	179
	180	#define REAL_VALUE_ATOF ereal_atof
	181	#define REAL_VALUE_NEGATE ereal_negate
	182
	183	#define REAL_VALUE_MINUS_ZERO(x) \
	184	((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
	185
	186	#define REAL_VALUE_TO_INT ereal_to_int
91d61207 RK	187
91d61207 RK	188	/* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0. */
7efc32fd RK	189	#define REAL_VALUE_FROM_INT(d, lo, hi, mode) \
7efc32fd RK	190	ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi), mode)
91d61207	191
7efc32fd RK	192	#define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi, mode) \
7efc32fd RK	193	ereal_from_uint (&d, lo, hi, mode)
fd76a739 RS	194
fd76a739 RS	195	/* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
7bb5d01e	196	#if LONG_DOUBLE_TYPE_SIZE == 96
fd76a739	197	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
7bb5d01e JW	198	#else
	199	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
	200	#endif
fd76a739	201	#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
7bb5d01e	202
fd76a739 RS	203	/* IN is a REAL_VALUE_TYPE. OUT is a long. */
fd76a739 RS	204	#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
7bb5d01e	205
7bb6fbd1 JL	206	/* Inverse of REAL_VALUE_TO_TARGET_DOUBLE. */
	207	#define REAL_VALUE_UNTO_TARGET_DOUBLE(d) (ereal_unto_double (d))
	208
	209	/* Inverse of REAL_VALUE_TO_TARGET_SINGLE. */
	210	#define REAL_VALUE_UNTO_TARGET_SINGLE(f) (ereal_unto_float (f))
	211
403cd5d7 RK	212	/* d is an array of HOST_WIDE_INT that holds a double precision
403cd5d7 RK	213	value in the target computer's floating point format. */
7bb5d01e JW	214	#define REAL_VALUE_FROM_TARGET_DOUBLE(d) (ereal_from_double (d))
7bb5d01e JW	215
403cd5d7	216	/* f is a HOST_WIDE_INT containing a single precision target float value. */
543758c6	217	#define REAL_VALUE_FROM_TARGET_SINGLE(f) (ereal_from_float (f))
fd76a739 RS	218
	219	/* Conversions to decimal ASCII string. */
	220	#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
	221
	222	#endif /* REAL_ARITHMETIC defined */
	223
	224	/* ** End of software floating point emulator interface macros ** */
7bb5d01e	225	#else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
fd76a739 RS	226
fd76a739 RS	227	/* old interface */
0694b47c RS	228	#ifdef REAL_ARITHMETIC
	229	/* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
	230	when REAL_ARITHMETIC etc. are not defined. */
	231
	232	/* Now see if the host and target machines use the same format.
	233	If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
	234	reals as doubles because we have no better way in this cross compiler.)
	235	This turns off various optimizations that can happen when we know the
	236	compiler's float format matches the target's float format.
	237	*/
	238	#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
	239	#define REAL_IS_NOT_DOUBLE
	240	#ifndef REAL_VALUE_TYPE
fd76a739 RS	241	typedef struct {
	242	HOST_WIDE_INT r[sizeof (double)/sizeof (HOST_WIDE_INT)];
	243	} realvaluetype;
	244	#define REAL_VALUE_TYPE realvaluetype
0694b47c RS	245	#endif /* no REAL_VALUE_TYPE */
	246	#endif /* formats differ */
	247	#endif /* 0 */
	248
fd76a739 RS	249	#endif /* emulator not used */
fd76a739 RS	250
0694b47c RS	251	/* If we are not cross-compiling, use a `double' to represent the
	252	floating-point value. Otherwise, use some other type
	253	(probably a struct containing an array of longs). */
	254	#ifndef REAL_VALUE_TYPE
	255	#define REAL_VALUE_TYPE double
	256	#else
	257	#define REAL_IS_NOT_DOUBLE
	258	#endif
	259
f9250555 RS	260	#if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
	261
	262	/* Convert a type `double' value in host format first to a type `float'
	263	value in host format and then to a single type `long' value which
	264	is the bitwise equivalent of the `float' value. */
fd76a739	265	#ifndef REAL_VALUE_TO_TARGET_SINGLE
f9250555 RS	266	#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
	267	do { float f = (float) (IN); \
	268	(OUT) = (long ) &f; \
fd76a739 RS	269	} while (0)
fd76a739 RS	270	#endif
f9250555 RS	271
	272	/* Convert a type `double' value in host format to a pair of type `long'
	273	values which is its bitwise equivalent, but put the two words into
	274	proper word order for the target. */
fd76a739	275	#ifndef REAL_VALUE_TO_TARGET_DOUBLE
f9250555 RS	276	#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
f9250555 RS	277	do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\
f76b9db2 ILT	278	if (HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN) \
	279	{ \
	280	(OUT)[0] = ((long *) &in)[0]; \
	281	(OUT)[1] = ((long *) &in)[1]; \
	282	} \
	283	else \
	284	{ \
	285	(OUT)[1] = ((long *) &in)[0]; \
	286	(OUT)[0] = ((long *) &in)[1]; \
	287	} \
f9250555	288	} while (0)
fd76a739	289	#endif
f9250555 RS	290	#endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
f9250555 RS	291
fd76a739 RS	292	/* In this configuration, double and long double are the same. */
	293	#ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
	294	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
	295	#endif
	296
0694b47c RS	297	/* Compare two floating-point values for equality. */
0694b47c RS	298	#ifndef REAL_VALUES_EQUAL
fd76a739	299	#define REAL_VALUES_EQUAL(x, y) ((x) == (y))
0694b47c RS	300	#endif
	301
	302	/* Compare two floating-point values for less than. */
	303	#ifndef REAL_VALUES_LESS
fd76a739	304	#define REAL_VALUES_LESS(x, y) ((x) < (y))
0694b47c RS	305	#endif
0694b47c RS	306
fd76a739 RS	307	/* Truncate toward zero to an integer floating-point value. */
	308	#ifndef REAL_VALUE_RNDZINT
	309	#define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
0694b47c RS	310	#endif
0694b47c RS	311
fd76a739 RS	312	/* Truncate toward zero to an unsigned integer floating-point value. */
	313	#ifndef REAL_VALUE_UNSIGNED_RNDZINT
	314	#define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
0694b47c RS	315	#endif
0694b47c RS	316
7bb5d01e	317	/* Convert a floating-point value to integer, rounding toward zero. */
0694b47c RS	318	#ifndef REAL_VALUE_FIX
	319	#define REAL_VALUE_FIX(x) ((int) (x))
	320	#endif
	321
7bb5d01e JW	322	/* Convert a floating-point value to unsigned integer, rounding
7bb5d01e JW	323	toward zero. */
0694b47c RS	324	#ifndef REAL_VALUE_UNSIGNED_FIX
	325	#define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
	326	#endif
	327
	328	/* Scale X by Y powers of 2. */
	329	#ifndef REAL_VALUE_LDEXP
fd76a739	330	#define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
0694b47c RS	331	extern double ldexp ();
	332	#endif
	333
	334	/* Convert the string X to a floating-point value. */
	335	#ifndef REAL_VALUE_ATOF
fd76a739 RS	336	#if 1
	337	/* Use real.c to convert decimal numbers to binary, ... */
	338	REAL_VALUE_TYPE ereal_atof ();
	339	#define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
	340	#else
	341	/* ... or, if you like the host computer's atof, go ahead and use it: */
	342	#define REAL_VALUE_ATOF(x, s) atof (x)
0694b47c RS	343	#if defined (MIPSEL) \|\| defined (MIPSEB)
	344	/* MIPS compiler can't handle parens around the function name.
	345	This problem does not appear to be connected with any
	346	macro definition for atof. It does not seem there is one. */
	347	extern double atof ();
	348	#else
	349	extern double (atof) ();
	350	#endif
	351	#endif
fd76a739	352	#endif
0694b47c RS	353
	354	/* Negate the floating-point value X. */
	355	#ifndef REAL_VALUE_NEGATE
	356	#define REAL_VALUE_NEGATE(x) (- (x))
	357	#endif
	358
	359	/* Truncate the floating-point value X to mode MODE. This is correct only
	360	for the most common case where the host and target have objects of the same
	361	size and where `float' is SFmode. */
	362
5352b11a	363	/* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate. */
e9a25f70	364	extern REAL_VALUE_TYPE real_value_truncate PROTO((enum machine_mode, REAL_VALUE_TYPE));
5352b11a	365
0694b47c RS	366	#ifndef REAL_VALUE_TRUNCATE
0694b47c RS	367	#define REAL_VALUE_TRUNCATE(mode, x) \
161ca48c RS	368	(GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \
161ca48c RS	369	? (float) (x) : (x))
0694b47c RS	370	#endif
	371
	372	/* Determine whether a floating-point value X is infinite. */
	373	#ifndef REAL_VALUE_ISINF
	374	#define REAL_VALUE_ISINF(x) (target_isinf (x))
	375	#endif
	376
3dd4b517 TW	377	/* Determine whether a floating-point value X is a NaN. */
	378	#ifndef REAL_VALUE_ISNAN
	379	#define REAL_VALUE_ISNAN(x) (target_isnan (x))
	380	#endif
	381
11030a60 RS	382	/* Determine whether a floating-point value X is negative. */
	383	#ifndef REAL_VALUE_NEGATIVE
	384	#define REAL_VALUE_NEGATIVE(x) (target_negative (x))
	385	#endif
	386
e9a25f70 JL	387	extern int target_isnan PROTO ((REAL_VALUE_TYPE));
	388	extern int target_isinf PROTO ((REAL_VALUE_TYPE));
	389	extern int target_negative PROTO ((REAL_VALUE_TYPE));
	390
0694b47c RS	391	/* Determine whether a floating-point value X is minus 0. */
0694b47c RS	392	#ifndef REAL_VALUE_MINUS_ZERO
11030a60	393	#define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
0694b47c RS	394	#endif
	395	\f
	396	/* Constant real values 0, 1, 2, and -1. */
	397
	398	extern REAL_VALUE_TYPE dconst0;
	399	extern REAL_VALUE_TYPE dconst1;
	400	extern REAL_VALUE_TYPE dconst2;
	401	extern REAL_VALUE_TYPE dconstm1;
	402
	403	/* Union type used for extracting real values from CONST_DOUBLEs
	404	or putting them in. */
	405
	406	union real_extract
	407	{
	408	REAL_VALUE_TYPE d;
3245eea0	409	HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)];
0694b47c RS	410	};
	411
	412	/* For a CONST_DOUBLE:
	413	The usual two ints that hold the value.
	414	For a DImode, that is all there are;
	415	and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
	416	For a float, the number of ints varies,
	417	and CONST_DOUBLE_LOW is the one that should come first in memory.
	418	So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
3245eea0 CH	419	#define CONST_DOUBLE_LOW(r) XWINT (r, 2)
3245eea0 CH	420	#define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
0694b47c RS	421
	422	/* Link for chain of all CONST_DOUBLEs in use in current function. */
	423	#define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
	424	/* The MEM which represents this CONST_DOUBLE's value in memory,
	425	or const0_rtx if no MEM has been made for it yet,
	426	or cc0_rtx if it is not on the chain. */
	427	#define CONST_DOUBLE_MEM(r) XEXP (r, 0)
	428
e9576d2c	429	/* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
0694b47c RS	430	/* Function to return a real value (not a tree node)
0694b47c RS	431	from a given integer constant. */
e9576d2c L	432	union tree_node;
	433	REAL_VALUE_TYPE real_value_from_int_cst PROTO ((union tree_node *,
	434	union tree_node *));
0694b47c RS	435
	436	#define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
	437	do { union real_extract u; \
4c9a05bc	438	bcopy ((char ) &CONST_DOUBLE_LOW ((from)), (char ) &u, sizeof u); \
0694b47c RS	439	to = u.d; } while (0)
	440
	441	/* Return a CONST_DOUBLE with value R and mode M. */
	442
fd76a739	443	#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r, m)
fca04441 RK	444	extern struct rtx_def *immed_real_const_1 PROTO((REAL_VALUE_TYPE,
	445	enum machine_mode));
	446
fd76a739 RS	447
	448	/* Convert a floating point value `r', that can be interpreted
	449	as a host machine float or double, to a decimal ASCII string `s'
	450	using printf format string `fmt'. */
	451	#ifndef REAL_VALUE_TO_DECIMAL
	452	#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
	453	#endif
0694b47c	454
ebc8186b RK	455	/* Replace R by 1/R in the given machine mode, if the result is exact. */
	456	extern int exact_real_inverse PROTO((enum machine_mode, REAL_VALUE_TYPE *));
	457
e9576d2c L	458	extern void debug_real PROTO ((REAL_VALUE_TYPE));
	459
	460	/* In varasm.c */
	461	extern void assemble_real PROTO ((REAL_VALUE_TYPE,
	462	enum machine_mode));
0694b47c	463	#endif /* Not REAL_H_INCLUDED */