[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, 675 Mass Ave, Cambridge, MA 02139, 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
#if HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN
#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT)				\
do { REAL_VALUE_TYPE in = (IN);  /* Make sure it's not in a register.  */\
     (OUT)[0] = ((long *) &in)[0];					\
     (OUT)[1] = ((long *) &in)[1];					\
   } while (0)
#else
#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT)				\
do { REAL_VALUE_TYPE in = (IN);  /* Make sure it's not in a register.  */\
     (OUT)[1] = ((long *) &in)[0];					\
     (OUT)[0] = ((long *) &in)[1];					\
   } while (0)
#endif
#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
	18	the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
	19
	20	#ifndef REAL_H_INCLUDED
	21	#define REAL_H_INCLUDED
	22
	23	/* Define codes for all the float formats that we know of. */
	24	#define UNKNOWN_FLOAT_FORMAT 0
	25	#define IEEE_FLOAT_FORMAT 1
	26	#define VAX_FLOAT_FORMAT 2
fd76a739	27	#define IBM_FLOAT_FORMAT 3
0694b47c RS	28
	29	/* Default to IEEE float if not specified. Nearly all machines use it. */
	30
	31	#ifndef TARGET_FLOAT_FORMAT
	32	#define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT
	33	#endif
	34
	35	#ifndef HOST_FLOAT_FORMAT
	36	#define HOST_FLOAT_FORMAT IEEE_FLOAT_FORMAT
	37	#endif
	38
	39	#if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
	40	#define REAL_INFINITY
	41	#endif
	42
91d61207 RK	43	/* If FLOAT_WORDS_BIG_ENDIAN and HOST_FLOAT_WORDS_BIG_ENDIAN are not defined
	44	in the header files, then this implies the word-endianness is the same as
	45	for integers. */
	46
	47	/* This is defined 0 or 1, like WORDS_BIG_ENDIAN. */
	48	#ifndef FLOAT_WORDS_BIG_ENDIAN
	49	#define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
	50	#endif
	51
	52	/* This is defined 0 or 1, unlike HOST_WORDS_BIG_ENDIAN. */
	53	#ifndef HOST_FLOAT_WORDS_BIG_ENDIAN
	54	#ifdef HOST_WORDS_BIG_ENDIAN
	55	#define HOST_FLOAT_WORDS_BIG_ENDIAN 1
	56	#else
	57	#define HOST_FLOAT_WORDS_BIG_ENDIAN 0
	58	#endif
	59	#endif
	60
fd76a739 RS	61	/* Defining REAL_ARITHMETIC invokes a floating point emulator
	62	that can produce a target machine format differing by more
	63	than just endian-ness from the host's format. The emulator
	64	is also used to support extended real XFmode. */
	65	#ifndef LONG_DOUBLE_TYPE_SIZE
	66	#define LONG_DOUBLE_TYPE_SIZE 64
	67	#endif
7bb5d01e JW	68	#if (LONG_DOUBLE_TYPE_SIZE == 96) \|\| (LONG_DOUBLE_TYPE_SIZE == 128)
	69	#ifndef REAL_ARITHMETIC
	70	#define REAL_ARITHMETIC
	71	#endif
	72	#endif
	73	#ifdef REAL_ARITHMETIC
fd76a739 RS	74	/* ** Start of software floating point emulator interface macros ** */
	75
	76	/* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE
	77	has been defined to be 96 in the tm.h machine file. */
	78	#if (LONG_DOUBLE_TYPE_SIZE == 96)
	79	#define REAL_IS_NOT_DOUBLE
	80	#define REAL_ARITHMETIC
	81	typedef struct {
	82	HOST_WIDE_INT r[(11 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
	83	} realvaluetype;
	84	#define REAL_VALUE_TYPE realvaluetype
	85
	86	#else /* no XFmode support */
	87
7bb5d01e JW	88	#if (LONG_DOUBLE_TYPE_SIZE == 128)
	89
	90	#define REAL_IS_NOT_DOUBLE
	91	#define REAL_ARITHMETIC
	92	typedef struct {
	93	HOST_WIDE_INT r[(19 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
	94	} realvaluetype;
	95	#define REAL_VALUE_TYPE realvaluetype
	96
	97	#else /* not TFmode */
	98
fd76a739 RS	99	#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
	100	/* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
	101	but it is not necessarily a host machine double. */
	102	#define REAL_IS_NOT_DOUBLE
	103	typedef struct {
	104	HOST_WIDE_INT r[(7 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
	105	} realvaluetype;
	106	#define REAL_VALUE_TYPE realvaluetype
	107	#else
	108	/* If host and target formats are compatible, then a REAL_VALUE_TYPE
	109	is actually a host machine double. */
	110	#define REAL_VALUE_TYPE double
	111	#endif
7bb5d01e JW	112
7bb5d01e JW	113	#endif /* no TFmode support */
fd76a739 RS	114	#endif /* no XFmode support */
fd76a739 RS	115
84f9b8e9 RK	116	extern int significand_size PROTO((enum machine_mode));
84f9b8e9 RK	117
fd76a739	118	/* If emulation has been enabled by defining REAL_ARITHMETIC or by
7bb5d01e	119	setting LONG_DOUBLE_TYPE_SIZE to 96 or 128, then define macros so that
fd76a739 RS	120	they invoke emulator functions. This will succeed only if the machine
	121	files have been updated to use these macros in place of any
	122	references to host machine `double' or `float' types. */
	123	#ifdef REAL_ARITHMETIC
	124	#undef REAL_ARITHMETIC
	125	#define REAL_ARITHMETIC(value, code, d1, d2) \
	126	earith (&(value), (code), &(d1), &(d2))
	127
fca04441 RK	128	/* Declare functions in real.c. */
	129	extern void earith PROTO((REAL_VALUE_TYPE *, int,
	130	REAL_VALUE_TYPE , REAL_VALUE_TYPE ));
	131	extern REAL_VALUE_TYPE etrunci PROTO((REAL_VALUE_TYPE));
	132	extern REAL_VALUE_TYPE etruncui PROTO((REAL_VALUE_TYPE));
	133	extern REAL_VALUE_TYPE ereal_atof PROTO((char *, enum machine_mode));
	134	extern REAL_VALUE_TYPE ereal_negate PROTO((REAL_VALUE_TYPE));
	135	extern HOST_WIDE_INT efixi PROTO((REAL_VALUE_TYPE));
	136	extern unsigned HOST_WIDE_INT efixui PROTO((REAL_VALUE_TYPE));
	137	extern void ereal_from_int PROTO((REAL_VALUE_TYPE *,
	138	HOST_WIDE_INT, HOST_WIDE_INT));
	139	extern void ereal_from_uint PROTO((REAL_VALUE_TYPE *,
	140	unsigned HOST_WIDE_INT,
	141	unsigned HOST_WIDE_INT));
	142	extern void ereal_to_int PROTO((HOST_WIDE_INT , HOST_WIDE_INT ,
	143	REAL_VALUE_TYPE));
	144	extern REAL_VALUE_TYPE ereal_ldexp PROTO((REAL_VALUE_TYPE, int));
	145
	146	extern void etartdouble PROTO((REAL_VALUE_TYPE, long *));
	147	extern void etarldouble PROTO((REAL_VALUE_TYPE, long *));
	148	extern void etardouble PROTO((REAL_VALUE_TYPE, long *));
	149	extern long etarsingle PROTO((REAL_VALUE_TYPE));
	150	extern void ereal_to_decimal PROTO((REAL_VALUE_TYPE, char *));
	151	extern int ereal_cmp PROTO((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
	152	extern int ereal_isneg PROTO((REAL_VALUE_TYPE));
403cd5d7 RK	153	extern REAL_VALUE_TYPE ereal_from_float PROTO((HOST_WIDE_INT));
403cd5d7 RK	154	extern REAL_VALUE_TYPE ereal_from_double PROTO((HOST_WIDE_INT *));
fd76a739 RS	155
	156	#define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
	157	/* true if x < y : */
265b1bae	158	#define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
fd76a739 RS	159	#define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
	160
	161	/* These return REAL_VALUE_TYPE: */
	162	#define REAL_VALUE_RNDZINT(x) (etrunci (x))
	163	#define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
	164	extern REAL_VALUE_TYPE real_value_truncate ();
	165	#define REAL_VALUE_TRUNCATE(mode, x) real_value_truncate (mode, x)
	166
91d61207	167	/* These return HOST_WIDE_INT: */
7bb5d01e JW	168	/* Convert a floating-point value to integer, rounding toward zero. */
	169	#define REAL_VALUE_FIX(x) (efixi (x))
	170	/* Convert a floating-point value to unsigned integer, rounding
	171	toward zero. */
	172	#define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
fd76a739 RS	173
	174	#define REAL_VALUE_ATOF ereal_atof
	175	#define REAL_VALUE_NEGATE ereal_negate
	176
	177	#define REAL_VALUE_MINUS_ZERO(x) \
	178	((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
	179
	180	#define REAL_VALUE_TO_INT ereal_to_int
91d61207 RK	181
	182	/* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0. */
	183	#define REAL_VALUE_FROM_INT(d, lo, hi) \
	184	ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi))
	185
	186	#define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi) (ereal_from_uint (&d, lo, hi))
fd76a739 RS	187
fd76a739 RS	188	/* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
7bb5d01e	189	#if LONG_DOUBLE_TYPE_SIZE == 96
fd76a739	190	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
7bb5d01e JW	191	#else
	192	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
	193	#endif
fd76a739	194	#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
7bb5d01e	195
fd76a739 RS	196	/* IN is a REAL_VALUE_TYPE. OUT is a long. */
fd76a739 RS	197	#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
7bb5d01e	198
403cd5d7 RK	199	/* d is an array of HOST_WIDE_INT that holds a double precision
403cd5d7 RK	200	value in the target computer's floating point format. */
7bb5d01e JW	201	#define REAL_VALUE_FROM_TARGET_DOUBLE(d) (ereal_from_double (d))
7bb5d01e JW	202
403cd5d7	203	/* f is a HOST_WIDE_INT containing a single precision target float value. */
543758c6	204	#define REAL_VALUE_FROM_TARGET_SINGLE(f) (ereal_from_float (f))
fd76a739 RS	205
	206	/* Conversions to decimal ASCII string. */
	207	#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
	208
	209	#endif /* REAL_ARITHMETIC defined */
	210
	211	/* ** End of software floating point emulator interface macros ** */
7bb5d01e	212	#else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
fd76a739 RS	213
fd76a739 RS	214	/* old interface */
0694b47c RS	215	#ifdef REAL_ARITHMETIC
	216	/* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
	217	when REAL_ARITHMETIC etc. are not defined. */
	218
	219	/* Now see if the host and target machines use the same format.
	220	If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
	221	reals as doubles because we have no better way in this cross compiler.)
	222	This turns off various optimizations that can happen when we know the
	223	compiler's float format matches the target's float format.
	224	*/
	225	#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
	226	#define REAL_IS_NOT_DOUBLE
	227	#ifndef REAL_VALUE_TYPE
fd76a739 RS	228	typedef struct {
	229	HOST_WIDE_INT r[sizeof (double)/sizeof (HOST_WIDE_INT)];
	230	} realvaluetype;
	231	#define REAL_VALUE_TYPE realvaluetype
0694b47c RS	232	#endif /* no REAL_VALUE_TYPE */
	233	#endif /* formats differ */
	234	#endif /* 0 */
	235
fd76a739 RS	236	#endif /* emulator not used */
fd76a739 RS	237
0694b47c RS	238	/* If we are not cross-compiling, use a `double' to represent the
	239	floating-point value. Otherwise, use some other type
	240	(probably a struct containing an array of longs). */
	241	#ifndef REAL_VALUE_TYPE
	242	#define REAL_VALUE_TYPE double
	243	#else
	244	#define REAL_IS_NOT_DOUBLE
	245	#endif
	246
f9250555 RS	247	#if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
	248
	249	/* Convert a type `double' value in host format first to a type `float'
	250	value in host format and then to a single type `long' value which
	251	is the bitwise equivalent of the `float' value. */
fd76a739	252	#ifndef REAL_VALUE_TO_TARGET_SINGLE
f9250555 RS	253	#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
	254	do { float f = (float) (IN); \
	255	(OUT) = (long ) &f; \
fd76a739 RS	256	} while (0)
fd76a739 RS	257	#endif
f9250555 RS	258
	259	/* Convert a type `double' value in host format to a pair of type `long'
	260	values which is its bitwise equivalent, but put the two words into
	261	proper word order for the target. */
fd76a739	262	#ifndef REAL_VALUE_TO_TARGET_DOUBLE
91d61207	263	#if HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN
f9250555 RS	264	#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
	265	do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\
	266	(OUT)[0] = ((long *) &in)[0]; \
	267	(OUT)[1] = ((long *) &in)[1]; \
	268	} while (0)
	269	#else
	270	#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
	271	do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\
	272	(OUT)[1] = ((long *) &in)[0]; \
	273	(OUT)[0] = ((long *) &in)[1]; \
	274	} while (0)
	275	#endif
fd76a739	276	#endif
f9250555 RS	277	#endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
f9250555 RS	278
fd76a739 RS	279	/* In this configuration, double and long double are the same. */
	280	#ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
	281	#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
	282	#endif
	283
0694b47c RS	284	/* Compare two floating-point values for equality. */
0694b47c RS	285	#ifndef REAL_VALUES_EQUAL
fd76a739	286	#define REAL_VALUES_EQUAL(x, y) ((x) == (y))
0694b47c RS	287	#endif
	288
	289	/* Compare two floating-point values for less than. */
	290	#ifndef REAL_VALUES_LESS
fd76a739	291	#define REAL_VALUES_LESS(x, y) ((x) < (y))
0694b47c RS	292	#endif
0694b47c RS	293
fd76a739 RS	294	/* Truncate toward zero to an integer floating-point value. */
	295	#ifndef REAL_VALUE_RNDZINT
	296	#define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
0694b47c RS	297	#endif
0694b47c RS	298
fd76a739 RS	299	/* Truncate toward zero to an unsigned integer floating-point value. */
	300	#ifndef REAL_VALUE_UNSIGNED_RNDZINT
	301	#define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
0694b47c RS	302	#endif
0694b47c RS	303
7bb5d01e	304	/* Convert a floating-point value to integer, rounding toward zero. */
0694b47c RS	305	#ifndef REAL_VALUE_FIX
	306	#define REAL_VALUE_FIX(x) ((int) (x))
	307	#endif
	308
7bb5d01e JW	309	/* Convert a floating-point value to unsigned integer, rounding
7bb5d01e JW	310	toward zero. */
0694b47c RS	311	#ifndef REAL_VALUE_UNSIGNED_FIX
	312	#define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
	313	#endif
	314
	315	/* Scale X by Y powers of 2. */
	316	#ifndef REAL_VALUE_LDEXP
fd76a739	317	#define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
0694b47c RS	318	extern double ldexp ();
	319	#endif
	320
	321	/* Convert the string X to a floating-point value. */
	322	#ifndef REAL_VALUE_ATOF
fd76a739 RS	323	#if 1
	324	/* Use real.c to convert decimal numbers to binary, ... */
	325	REAL_VALUE_TYPE ereal_atof ();
	326	#define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
	327	#else
	328	/* ... or, if you like the host computer's atof, go ahead and use it: */
	329	#define REAL_VALUE_ATOF(x, s) atof (x)
0694b47c RS	330	#if defined (MIPSEL) \|\| defined (MIPSEB)
	331	/* MIPS compiler can't handle parens around the function name.
	332	This problem does not appear to be connected with any
	333	macro definition for atof. It does not seem there is one. */
	334	extern double atof ();
	335	#else
	336	extern double (atof) ();
	337	#endif
	338	#endif
fd76a739	339	#endif
0694b47c RS	340
	341	/* Negate the floating-point value X. */
	342	#ifndef REAL_VALUE_NEGATE
	343	#define REAL_VALUE_NEGATE(x) (- (x))
	344	#endif
	345
	346	/* Truncate the floating-point value X to mode MODE. This is correct only
	347	for the most common case where the host and target have objects of the same
	348	size and where `float' is SFmode. */
	349
5352b11a RS	350	/* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate. */
	351	extern REAL_VALUE_TYPE real_value_truncate ();
	352
0694b47c RS	353	#ifndef REAL_VALUE_TRUNCATE
0694b47c RS	354	#define REAL_VALUE_TRUNCATE(mode, x) \
161ca48c RS	355	(GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \
161ca48c RS	356	? (float) (x) : (x))
0694b47c RS	357	#endif
	358
	359	/* Determine whether a floating-point value X is infinite. */
	360	#ifndef REAL_VALUE_ISINF
	361	#define REAL_VALUE_ISINF(x) (target_isinf (x))
	362	#endif
	363
3dd4b517 TW	364	/* Determine whether a floating-point value X is a NaN. */
	365	#ifndef REAL_VALUE_ISNAN
	366	#define REAL_VALUE_ISNAN(x) (target_isnan (x))
	367	#endif
	368
11030a60 RS	369	/* Determine whether a floating-point value X is negative. */
	370	#ifndef REAL_VALUE_NEGATIVE
	371	#define REAL_VALUE_NEGATIVE(x) (target_negative (x))
	372	#endif
	373
0694b47c RS	374	/* Determine whether a floating-point value X is minus 0. */
0694b47c RS	375	#ifndef REAL_VALUE_MINUS_ZERO
11030a60	376	#define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
0694b47c RS	377	#endif
	378	\f
	379	/* Constant real values 0, 1, 2, and -1. */
	380
	381	extern REAL_VALUE_TYPE dconst0;
	382	extern REAL_VALUE_TYPE dconst1;
	383	extern REAL_VALUE_TYPE dconst2;
	384	extern REAL_VALUE_TYPE dconstm1;
	385
	386	/* Union type used for extracting real values from CONST_DOUBLEs
	387	or putting them in. */
	388
	389	union real_extract
	390	{
	391	REAL_VALUE_TYPE d;
3245eea0	392	HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)];
0694b47c RS	393	};
	394
	395	/* For a CONST_DOUBLE:
	396	The usual two ints that hold the value.
	397	For a DImode, that is all there are;
	398	and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
	399	For a float, the number of ints varies,
	400	and CONST_DOUBLE_LOW is the one that should come first in memory.
	401	So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
3245eea0 CH	402	#define CONST_DOUBLE_LOW(r) XWINT (r, 2)
3245eea0 CH	403	#define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
0694b47c RS	404
	405	/* Link for chain of all CONST_DOUBLEs in use in current function. */
	406	#define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
	407	/* The MEM which represents this CONST_DOUBLE's value in memory,
	408	or const0_rtx if no MEM has been made for it yet,
	409	or cc0_rtx if it is not on the chain. */
	410	#define CONST_DOUBLE_MEM(r) XEXP (r, 0)
	411
	412	/* Function to return a real value (not a tree node)
	413	from a given integer constant. */
	414	REAL_VALUE_TYPE real_value_from_int_cst ();
	415
	416	/* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
	417
	418	#define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
	419	do { union real_extract u; \
4c9a05bc	420	bcopy ((char ) &CONST_DOUBLE_LOW ((from)), (char ) &u, sizeof u); \
0694b47c RS	421	to = u.d; } while (0)
	422
	423	/* Return a CONST_DOUBLE with value R and mode M. */
	424
fd76a739	425	#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r, m)
fca04441 RK	426	extern struct rtx_def *immed_real_const_1 PROTO((REAL_VALUE_TYPE,
	427	enum machine_mode));
	428
fd76a739 RS	429
	430	/* Convert a floating point value `r', that can be interpreted
	431	as a host machine float or double, to a decimal ASCII string `s'
	432	using printf format string `fmt'. */
	433	#ifndef REAL_VALUE_TO_DECIMAL
	434	#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
	435	#endif
0694b47c RS	436
0694b47c RS	437	#endif /* Not REAL_H_INCLUDED */