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352 lines
12 KiB
C
352 lines
12 KiB
C
/* Definitions of floating-point access for GNU compiler.
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Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998,
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1999, 2000, 2002 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#ifndef GCC_REAL_H
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#define GCC_REAL_H
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#include "machmode.h"
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/* An expanded form of the represented number. */
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/* Enumerate the special cases of numbers that we encounter. */
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enum real_value_class {
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rvc_zero,
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rvc_normal,
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rvc_inf,
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rvc_nan
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};
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#define SIGNIFICAND_BITS (128 + HOST_BITS_PER_LONG)
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#define EXP_BITS (32 - 3)
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#define MAX_EXP ((1 << (EXP_BITS - 1)) - 1)
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#define SIGSZ (SIGNIFICAND_BITS / HOST_BITS_PER_LONG)
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#define SIG_MSB ((unsigned long)1 << (HOST_BITS_PER_LONG - 1))
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struct real_value GTY(())
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{
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ENUM_BITFIELD (real_value_class) class : 2;
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unsigned int sign : 1;
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signed int exp : EXP_BITS;
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unsigned long sig[SIGSZ];
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};
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/* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it
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needs to be a macro. We do need to continue to have a structure tag
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so that other headers can forward declare it. */
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#define REAL_VALUE_TYPE struct real_value
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/* We store a REAL_VALUE_TYPE into an rtx, and we do this by putting it in
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consecutive "w" slots. Moreover, we've got to compute the number of "w"
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slots at preprocessor time, which means we can't use sizeof. Guess. */
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#define REAL_VALUE_TYPE_SIZE (SIGNIFICAND_BITS + 32)
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#define REAL_WIDTH \
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(REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \
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+ (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */
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/* Verify the guess. */
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extern char test_real_width
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[sizeof(REAL_VALUE_TYPE) <= REAL_WIDTH*sizeof(HOST_WIDE_INT) ? 1 : -1];
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/* Calculate the format for CONST_DOUBLE. We need as many slots as
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are necessary to overlay a REAL_VALUE_TYPE on them. This could be
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as many as four (32-bit HOST_WIDE_INT, 128-bit REAL_VALUE_TYPE).
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A number of places assume that there are always at least two 'w'
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slots in a CONST_DOUBLE, so we provide them even if one would suffice. */
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#if REAL_WIDTH == 1
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# define CONST_DOUBLE_FORMAT "ww"
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#else
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# if REAL_WIDTH == 2
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# define CONST_DOUBLE_FORMAT "ww"
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# else
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# if REAL_WIDTH == 3
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# define CONST_DOUBLE_FORMAT "www"
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# else
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# if REAL_WIDTH == 4
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# define CONST_DOUBLE_FORMAT "wwww"
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# else
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# if REAL_WIDTH == 5
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# define CONST_DOUBLE_FORMAT "wwwww"
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# else
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# if REAL_WIDTH == 6
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# define CONST_DOUBLE_FORMAT "wwwwww"
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# else
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#error "REAL_WIDTH > 6 not supported"
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# endif
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# endif
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# endif
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# endif
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# endif
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#endif
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/* Describes the properties of the specific target format in use. */
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struct real_format
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{
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/* Move to and from the target bytes. */
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void (*encode) PARAMS ((const struct real_format *, long *,
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const REAL_VALUE_TYPE *));
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void (*decode) PARAMS ((const struct real_format *, REAL_VALUE_TYPE *,
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const long *));
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/* The radix of the exponent and digits of the significand. */
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int b;
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/* log2(b). */
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int log2_b;
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/* Size of the significand in digits of radix B. */
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int p;
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/* The minimum negative integer, x, such that b**(x-1) is normalized. */
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int emin;
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/* The maximum integer, x, such that b**(x-1) is representable. */
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int emax;
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/* Properties of the format. */
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bool has_nans;
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bool has_inf;
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bool has_denorm;
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bool has_signed_zero;
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bool qnan_msb_set;
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};
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/* The target format used for each floating floating point mode.
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Indexed by MODE - QFmode. */
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extern const struct real_format *real_format_for_mode[TFmode - QFmode + 1];
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/* Declare functions in real.c. */
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/* Binary or unary arithmetic on tree_code. */
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extern void real_arithmetic PARAMS ((REAL_VALUE_TYPE *, int,
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const REAL_VALUE_TYPE *,
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const REAL_VALUE_TYPE *));
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/* Compare reals by tree_code. */
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extern bool real_compare PARAMS ((int, const REAL_VALUE_TYPE *,
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const REAL_VALUE_TYPE *));
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/* Determine whether a floating-point value X is infinite. */
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extern bool real_isinf PARAMS ((const REAL_VALUE_TYPE *));
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/* Determine whether a floating-point value X is a NaN. */
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extern bool real_isnan PARAMS ((const REAL_VALUE_TYPE *));
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/* Determine whether a floating-point value X is negative. */
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extern bool real_isneg PARAMS ((const REAL_VALUE_TYPE *));
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/* Determine whether a floating-point value X is minus zero. */
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extern bool real_isnegzero PARAMS ((const REAL_VALUE_TYPE *));
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/* Compare two floating-point objects for bitwise identity. */
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extern bool real_identical PARAMS ((const REAL_VALUE_TYPE *,
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const REAL_VALUE_TYPE *));
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/* Extend or truncate to a new mode. */
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extern void real_convert PARAMS ((REAL_VALUE_TYPE *,
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enum machine_mode,
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const REAL_VALUE_TYPE *));
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/* Return true if truncating to NEW is exact. */
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extern bool exact_real_truncate PARAMS ((enum machine_mode,
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const REAL_VALUE_TYPE *));
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/* Render R as a decimal floating point constant. */
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extern void real_to_decimal PARAMS ((char *, const REAL_VALUE_TYPE *,
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size_t, size_t, int));
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/* Render R as a hexadecimal floating point constant. */
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extern void real_to_hexadecimal PARAMS ((char *, const REAL_VALUE_TYPE *,
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size_t, size_t, int));
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/* Render R as an integer. */
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extern HOST_WIDE_INT real_to_integer PARAMS ((const REAL_VALUE_TYPE *));
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extern void real_to_integer2 PARAMS ((HOST_WIDE_INT *, HOST_WIDE_INT *,
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const REAL_VALUE_TYPE *));
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/* Initialize R from a decimal or hexadecimal string. */
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extern void real_from_string PARAMS ((REAL_VALUE_TYPE *, const char *));
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/* Initialize R from an integer pair HIGH/LOW. */
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extern void real_from_integer PARAMS ((REAL_VALUE_TYPE *,
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enum machine_mode,
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unsigned HOST_WIDE_INT,
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HOST_WIDE_INT, int));
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extern long real_to_target_fmt PARAMS ((long *, const REAL_VALUE_TYPE *,
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const struct real_format *));
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extern long real_to_target PARAMS ((long *, const REAL_VALUE_TYPE *,
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enum machine_mode));
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extern void real_from_target_fmt PARAMS ((REAL_VALUE_TYPE *, const long *,
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const struct real_format *));
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extern void real_from_target PARAMS ((REAL_VALUE_TYPE *, const long *,
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enum machine_mode));
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extern void real_inf PARAMS ((REAL_VALUE_TYPE *));
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extern bool real_nan PARAMS ((REAL_VALUE_TYPE *, const char *,
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int, enum machine_mode));
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extern void real_2expN PARAMS ((REAL_VALUE_TYPE *, int));
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extern unsigned int real_hash PARAMS ((const REAL_VALUE_TYPE *));
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/* Target formats defined in real.c. */
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extern const struct real_format ieee_single_format;
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extern const struct real_format ieee_double_format;
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extern const struct real_format ieee_extended_motorola_format;
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extern const struct real_format ieee_extended_intel_96_format;
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extern const struct real_format ieee_extended_intel_96_round_53_format;
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extern const struct real_format ieee_extended_intel_128_format;
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extern const struct real_format ibm_extended_format;
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extern const struct real_format ieee_quad_format;
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extern const struct real_format vax_f_format;
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extern const struct real_format vax_d_format;
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extern const struct real_format vax_g_format;
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extern const struct real_format i370_single_format;
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extern const struct real_format i370_double_format;
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extern const struct real_format c4x_single_format;
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extern const struct real_format c4x_extended_format;
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extern const struct real_format real_internal_format;
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/* ====================================================================== */
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/* Crap. */
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#define REAL_ARITHMETIC(value, code, d1, d2) \
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real_arithmetic (&(value), code, &(d1), &(d2))
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#define REAL_VALUES_IDENTICAL(x, y) real_identical (&(x), &(y))
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#define REAL_VALUES_EQUAL(x, y) real_compare (EQ_EXPR, &(x), &(y))
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#define REAL_VALUES_LESS(x, y) real_compare (LT_EXPR, &(x), &(y))
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/* Determine whether a floating-point value X is infinite. */
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#define REAL_VALUE_ISINF(x) real_isinf (&(x))
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/* Determine whether a floating-point value X is a NaN. */
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#define REAL_VALUE_ISNAN(x) real_isnan (&(x))
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/* Determine whether a floating-point value X is negative. */
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#define REAL_VALUE_NEGATIVE(x) real_isneg (&(x))
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/* Determine whether a floating-point value X is minus zero. */
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#define REAL_VALUE_MINUS_ZERO(x) real_isnegzero (&(x))
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/* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
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#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \
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real_to_target (OUT, &(IN), \
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mode_for_size (LONG_DOUBLE_TYPE_SIZE, MODE_FLOAT, 0))
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#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
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real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0))
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/* IN is a REAL_VALUE_TYPE. OUT is a long. */
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#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
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((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0)))
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#define REAL_VALUE_FROM_INT(r, lo, hi, mode) \
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real_from_integer (&(r), mode, lo, hi, 0)
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#define REAL_VALUE_FROM_UNSIGNED_INT(r, lo, hi, mode) \
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real_from_integer (&(r), mode, lo, hi, 1)
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extern REAL_VALUE_TYPE real_value_truncate PARAMS ((enum machine_mode,
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REAL_VALUE_TYPE));
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#define REAL_VALUE_TO_INT(plow, phigh, r) \
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real_to_integer2 (plow, phigh, &(r))
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extern REAL_VALUE_TYPE real_arithmetic2 PARAMS ((int, const REAL_VALUE_TYPE *,
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const REAL_VALUE_TYPE *));
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#define REAL_VALUE_NEGATE(X) \
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real_arithmetic2 (NEGATE_EXPR, &(X), NULL)
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#define REAL_VALUE_ABS(X) \
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real_arithmetic2 (ABS_EXPR, &(X), NULL)
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extern int significand_size PARAMS ((enum machine_mode));
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extern REAL_VALUE_TYPE real_from_string2 PARAMS ((const char *,
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enum machine_mode));
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#define REAL_VALUE_ATOF(s, m) \
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real_from_string2 (s, m)
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#define CONST_DOUBLE_ATOF(s, m) \
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CONST_DOUBLE_FROM_REAL_VALUE (real_from_string2 (s, m), m)
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#define REAL_VALUE_FIX(r) \
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real_to_integer (&(r))
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/* ??? Not quite right. */
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#define REAL_VALUE_UNSIGNED_FIX(r) \
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real_to_integer (&(r))
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/* ??? These were added for Paranoia support. */
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/* Return floor log2(R). */
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extern int real_exponent PARAMS ((const REAL_VALUE_TYPE *));
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/* R = A * 2**EXP. */
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extern void real_ldexp PARAMS ((REAL_VALUE_TYPE *,
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const REAL_VALUE_TYPE *, int));
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/* **** End of software floating point emulator interface macros **** */
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/* Constant real values 0, 1, 2, and -1. */
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extern REAL_VALUE_TYPE dconst0;
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extern REAL_VALUE_TYPE dconst1;
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extern REAL_VALUE_TYPE dconst2;
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extern REAL_VALUE_TYPE dconstm1;
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/* Function to return a real value (not a tree node)
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from a given integer constant. */
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REAL_VALUE_TYPE real_value_from_int_cst PARAMS ((union tree_node *,
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union tree_node *));
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/* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
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#define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
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memcpy (&(to), &CONST_DOUBLE_LOW ((from)), sizeof (REAL_VALUE_TYPE))
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/* Return a CONST_DOUBLE with value R and mode M. */
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#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) \
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const_double_from_real_value (r, m)
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extern rtx const_double_from_real_value PARAMS ((REAL_VALUE_TYPE,
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enum machine_mode));
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/* Replace R by 1/R in the given machine mode, if the result is exact. */
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extern bool exact_real_inverse PARAMS ((enum machine_mode, REAL_VALUE_TYPE *));
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/* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */
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extern tree build_real PARAMS ((tree, REAL_VALUE_TYPE));
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#endif /* ! GCC_REAL_H */
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