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gcc/gcc/real.h
Geoffrey Keating e2500fedef Merge from pch-branch up to tag pch-commit-20020603. 
From-SVN: r54232
2002-06-04 07:11:05 +00:00

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/* Definitions of floating-point access for GNU compiler.
Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998,
1999, 2000, 2002 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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.
GCC 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 GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#ifndef GCC_REAL_H
#define GCC_REAL_H
#include "machmode.h"
/* 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
#define C4X_FLOAT_FORMAT 4
/* 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
#ifndef INTEL_EXTENDED_IEEE_FORMAT
#define INTEL_EXTENDED_IEEE_FORMAT 0
#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
#ifndef LONG_DOUBLE_TYPE_SIZE
#define LONG_DOUBLE_TYPE_SIZE 64
#endif
/* MAX_LONG_DOUBLE_TYPE_SIZE is a constant tested by #if.
LONG_DOUBLE_TYPE_SIZE can vary at compiler run time.
So long as macros like REAL_VALUE_TO_TARGET_LONG_DOUBLE cannot
vary too, however, then XFmode and TFmode long double
cannot both be supported at the same time. */
#ifndef MAX_LONG_DOUBLE_TYPE_SIZE
#define MAX_LONG_DOUBLE_TYPE_SIZE LONG_DOUBLE_TYPE_SIZE
#endif
/* **** Start of software floating point emulator interface macros **** */
/* REAL_VALUE_TYPE is an array of the minimum number of HOST_WIDE_INTs
required to hold either a 96- or 160-bit extended precision floating
point type. This is true even if the maximum precision floating
point type on the target is smaller. */
#if MAX_LONG_DOUBLE_TYPE_SIZE == 128 && !INTEL_EXTENDED_IEEE_FORMAT
#define REAL_VALUE_TYPE_SIZE 160
#else
#define REAL_VALUE_TYPE_SIZE 96
#endif
#define REAL_WIDTH \
(REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \
+ (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */
struct realvaluetype GTY(()) {
HOST_WIDE_INT r[REAL_WIDTH];
};
/* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it needs
to be a macro. realvaluetype cannot be a typedef as this interferes with
other headers declaring opaque pointers to it. */
#define REAL_VALUE_TYPE struct realvaluetype
/* Calculate the format for CONST_DOUBLE. We need as many slots as
are necessary to overlay a REAL_VALUE_TYPE on them. This could be
as many as five (32-bit HOST_WIDE_INT, 160-bit REAL_VALUE_TYPE).
A number of places assume that there are always at least two 'w'
slots in a CONST_DOUBLE, so we provide them even if one would suffice. */
#if REAL_WIDTH == 1
# define CONST_DOUBLE_FORMAT "ww"
#else
# if REAL_WIDTH == 2
# define CONST_DOUBLE_FORMAT "ww"
# else
# if REAL_WIDTH == 3
# define CONST_DOUBLE_FORMAT "www"
# else
# if REAL_WIDTH == 4
# define CONST_DOUBLE_FORMAT "wwww"
# else
# if REAL_WIDTH == 5
# define CONST_DOUBLE_FORMAT "wwwww"
# else
#error "REAL_WIDTH > 5 not supported"
# endif
# endif
# endif
# endif
#endif
extern unsigned int significand_size PARAMS ((enum machine_mode));
#define REAL_ARITHMETIC(value, code, d1, d2) \
earith (&(value), (code), &(d1), &(d2))
/* Declare functions in real.c. */
extern void earith PARAMS ((REAL_VALUE_TYPE *, int,
REAL_VALUE_TYPE *, REAL_VALUE_TYPE *));
extern REAL_VALUE_TYPE etrunci PARAMS ((REAL_VALUE_TYPE));
extern REAL_VALUE_TYPE etruncui PARAMS ((REAL_VALUE_TYPE));
extern REAL_VALUE_TYPE ereal_negate PARAMS ((REAL_VALUE_TYPE));
extern HOST_WIDE_INT efixi PARAMS ((REAL_VALUE_TYPE));
extern unsigned HOST_WIDE_INT efixui PARAMS ((REAL_VALUE_TYPE));
extern void ereal_from_int PARAMS ((REAL_VALUE_TYPE *,
HOST_WIDE_INT, HOST_WIDE_INT,
enum machine_mode));
extern void ereal_from_uint PARAMS ((REAL_VALUE_TYPE *,
unsigned HOST_WIDE_INT,
unsigned HOST_WIDE_INT,
enum machine_mode));
extern void ereal_to_int PARAMS ((HOST_WIDE_INT *, HOST_WIDE_INT *,
REAL_VALUE_TYPE));
extern REAL_VALUE_TYPE ereal_ldexp PARAMS ((REAL_VALUE_TYPE, int));
extern void etartdouble PARAMS ((REAL_VALUE_TYPE, long *));
extern void etarldouble PARAMS ((REAL_VALUE_TYPE, long *));
extern void etardouble PARAMS ((REAL_VALUE_TYPE, long *));
extern long etarsingle PARAMS ((REAL_VALUE_TYPE));
extern void ereal_to_decimal PARAMS ((REAL_VALUE_TYPE, char *));
extern int ereal_cmp PARAMS ((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
extern int ereal_isneg PARAMS ((REAL_VALUE_TYPE));
extern REAL_VALUE_TYPE ereal_unto_float PARAMS ((long));
extern REAL_VALUE_TYPE ereal_unto_double PARAMS ((long *));
extern REAL_VALUE_TYPE ereal_from_float PARAMS ((HOST_WIDE_INT));
extern REAL_VALUE_TYPE ereal_from_double PARAMS ((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)
/* Compare two floating-point objects for bitwise identity.
This is not the same as comparing for equality on IEEE hosts:
-0.0 equals 0.0 but they are not identical, and conversely
two NaNs might be identical but they cannot be equal. */
#define REAL_VALUES_IDENTICAL(x, y) \
(!memcmp ((char *) &(x), (char *) &(y), sizeof (REAL_VALUE_TYPE)))
/* These return REAL_VALUE_TYPE: */
#define REAL_VALUE_RNDZINT(x) (etrunci (x))
#define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
/* Truncate the floating-point value X to mode MODE. */
#define REAL_VALUE_TRUNCATE(mode, x) real_value_truncate (mode, x)
extern REAL_VALUE_TYPE real_value_truncate PARAMS ((enum machine_mode,
REAL_VALUE_TYPE));
/* Expansion of REAL_VALUE_TRUNCATE.
The result is in floating point, rounded to nearest or even. */
extern bool exact_real_truncate PARAMS ((enum machine_mode,
REAL_VALUE_TYPE *));
/* 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))
/* Convert ASCII string S to floating point in mode M.
Decimal input uses ATOF. Hexadecimal uses HTOF. */
#define REAL_VALUE_ATOF(s,m) ereal_atof(s,m)
#define REAL_VALUE_HTOF(s,m) ereal_atof(s,m)
#define REAL_VALUE_NEGATE ereal_negate
/* Compute the absolute value of a floating-point value X. */
#define REAL_VALUE_ABS(x) \
(REAL_VALUE_NEGATIVE (x) ? REAL_VALUE_NEGATE (x) : (x))
/* Determine whether a floating-point value X is infinite. */
#define REAL_VALUE_ISINF(x) (target_isinf (x))
/* Determine whether a floating-point value X is a NaN. */
#define REAL_VALUE_ISNAN(x) (target_isnan (x))
/* Determine whether a floating-point value X is negative. */
#define REAL_VALUE_NEGATIVE(x) (target_negative (x))
/* Determine whether a floating-point value X is minus zero. */
#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. */
#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \
(LONG_DOUBLE_TYPE_SIZE == 64 ? etardouble ((IN), (OUT)) \
: LONG_DOUBLE_TYPE_SIZE == 96 ? etarldouble ((IN), (OUT)) \
: LONG_DOUBLE_TYPE_SIZE == 128 ? etartdouble ((IN), (OUT)) \
: abort ())
#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))
/* **** End of software floating point emulator interface macros **** */
/* 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;
/* 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 PARAMS ((union tree_node *,
union tree_node *));
#define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
memcpy (&(to), &CONST_DOUBLE_LOW ((from)), sizeof (REAL_VALUE_TYPE))
/* Return a CONST_DOUBLE with value R and mode M. */
#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) \
const_double_from_real_value (r, m)
extern rtx const_double_from_real_value PARAMS ((REAL_VALUE_TYPE,
enum machine_mode));
/* Shorthand; can be handy in machine descriptions. */
#define CONST_DOUBLE_ATOF(s, m) \
CONST_DOUBLE_FROM_REAL_VALUE (REAL_VALUE_ATOF (s, m), m)
/* Replace R by 1/R in the given machine mode, if the result is exact. */
extern int exact_real_inverse PARAMS ((enum machine_mode, REAL_VALUE_TYPE *));
extern int target_isnan PARAMS ((REAL_VALUE_TYPE));
extern int target_isinf PARAMS ((REAL_VALUE_TYPE));
extern int target_negative PARAMS ((REAL_VALUE_TYPE));
extern void debug_real PARAMS ((REAL_VALUE_TYPE));
extern REAL_VALUE_TYPE ereal_atof PARAMS ((const char *, enum machine_mode));
/* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */
extern tree build_real PARAMS ((tree, REAL_VALUE_TYPE));
#endif /* ! GCC_REAL_H */
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