429 lines
15 KiB
C
429 lines
15 KiB
C
/* Definitions of floating-point access for GNU compiler.
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Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998, 1999,
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2000, 2002, 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, 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 - 6)
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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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/* Use the same underlying type for all bit-fields, so as to make
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sure they're packed together, otherwise REAL_VALUE_TYPE_SIZE will
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be miscomputed. */
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unsigned int /* ENUM_BITFIELD (real_value_class) */ cl : 2;
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unsigned int decimal : 1;
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unsigned int sign : 1;
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unsigned int signalling : 1;
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unsigned int canonical : 1;
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unsigned int uexp : EXP_BITS;
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unsigned long sig[SIGSZ];
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};
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#define REAL_EXP(REAL) \
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((int)((REAL)->uexp ^ (unsigned int)(1 << (EXP_BITS - 1))) \
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- (1 << (EXP_BITS - 1)))
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#define SET_REAL_EXP(REAL, EXP) \
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((REAL)->uexp = ((unsigned int)(EXP) & (unsigned int)((1 << EXP_BITS) - 1)))
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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) (const struct real_format *, long *,
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const REAL_VALUE_TYPE *);
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void (*decode) (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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/* Size of the significant of a NaN, in digits of radix B. */
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int pnan;
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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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/* The bit position of the sign bit, for determining whether a value
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is positive/negative, or -1 for a complex encoding. */
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int signbit_ro;
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/* The bit position of the sign bit, for changing the sign of a number,
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or -1 for a complex encoding. */
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int signbit_rw;
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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 point mode.
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Float modes are followed by decimal float modes, with entries for
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float modes indexed by (MODE - first float mode), and entries for
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decimal float modes indexed by (MODE - first decimal float mode) +
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the number of float modes. */
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extern const struct real_format *
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real_format_for_mode[MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1
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+ MAX_MODE_DECIMAL_FLOAT - MIN_MODE_DECIMAL_FLOAT + 1];
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#define REAL_MODE_FORMAT(MODE) \
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(real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE) \
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? ((MODE - MIN_MODE_DECIMAL_FLOAT) \
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+ (MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1)) \
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: (MODE - MIN_MODE_FLOAT)])
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/* The following macro determines whether the floating point format is
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composite, i.e. may contain non-consecutive mantissa bits, in which
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case compile-time FP overflow may not model run-time overflow. */
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#define REAL_MODE_FORMAT_COMPOSITE_P(MODE) \
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((REAL_MODE_FORMAT(MODE))->pnan < (REAL_MODE_FORMAT (MODE))->p)
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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 bool real_arithmetic (REAL_VALUE_TYPE *, int, 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 (int, const REAL_VALUE_TYPE *, 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 (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 (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 (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 (const REAL_VALUE_TYPE *);
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/* Compare two floating-point objects for bitwise identity. */
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extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
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/* Extend or truncate to a new mode. */
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extern void real_convert (REAL_VALUE_TYPE *, 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 (enum machine_mode, 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 (char *, const REAL_VALUE_TYPE *, size_t,
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size_t, int);
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/* Render R as a hexadecimal floating point constant. */
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extern void real_to_hexadecimal (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 (const REAL_VALUE_TYPE *);
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extern void real_to_integer2 (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 (REAL_VALUE_TYPE *, const char *);
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/* Wrapper to allow different internal representation for decimal floats. */
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extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, enum machine_mode);
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/* Initialize R from an integer pair HIGH/LOW. */
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extern void real_from_integer (REAL_VALUE_TYPE *, enum machine_mode,
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unsigned HOST_WIDE_INT, HOST_WIDE_INT, int);
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extern long real_to_target_fmt (long *, const REAL_VALUE_TYPE *,
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const struct real_format *);
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extern long real_to_target (long *, const REAL_VALUE_TYPE *, enum machine_mode);
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extern void real_from_target_fmt (REAL_VALUE_TYPE *, const long *,
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const struct real_format *);
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extern void real_from_target (REAL_VALUE_TYPE *, const long *,
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enum machine_mode);
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extern void real_inf (REAL_VALUE_TYPE *);
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extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, enum machine_mode);
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extern void real_maxval (REAL_VALUE_TYPE *, int, enum machine_mode);
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extern void real_2expN (REAL_VALUE_TYPE *, int);
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extern unsigned int real_hash (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 mips_single_format;
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extern const struct real_format ieee_double_format;
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extern const struct real_format mips_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 mips_extended_format;
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extern const struct real_format ieee_quad_format;
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extern const struct real_format mips_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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extern const struct real_format decimal_single_format;
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extern const struct real_format decimal_double_format;
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extern const struct real_format decimal_quad_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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/* Real values to IEEE 754R decimal floats. */
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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_DECIMAL128(IN, OUT) \
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real_to_target (OUT, &(IN), mode_for_size (128, MODE_DECIMAL_FLOAT, 0))
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#define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \
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real_to_target (OUT, &(IN), mode_for_size (64, MODE_DECIMAL_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_DECIMAL32(IN, OUT) \
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((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_DECIMAL_FLOAT, 0)))
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extern REAL_VALUE_TYPE real_value_truncate (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 (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 (enum machine_mode);
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extern REAL_VALUE_TYPE real_from_string2 (const char *, 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 (const REAL_VALUE_TYPE *);
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/* R = A * 2**EXP. */
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extern void real_ldexp (REAL_VALUE_TYPE *, 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, 3, 10, -1, -2, 0.5 and 1/3. */
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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 dconst3;
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extern REAL_VALUE_TYPE dconst10;
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extern REAL_VALUE_TYPE dconstm1;
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extern REAL_VALUE_TYPE dconstm2;
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extern REAL_VALUE_TYPE dconsthalf;
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extern REAL_VALUE_TYPE dconstthird;
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extern REAL_VALUE_TYPE dconstpi;
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extern REAL_VALUE_TYPE dconste;
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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 (tree, tree);
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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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((to) = *CONST_DOUBLE_REAL_VALUE (from))
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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 (REAL_VALUE_TYPE, 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 (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 (tree, REAL_VALUE_TYPE);
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/* Calculate R as the square root of X in the given machine mode. */
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extern bool real_sqrt (REAL_VALUE_TYPE *, enum machine_mode,
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const REAL_VALUE_TYPE *);
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/* Calculate R as X raised to the integer exponent N in mode MODE. */
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extern bool real_powi (REAL_VALUE_TYPE *, enum machine_mode,
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const REAL_VALUE_TYPE *, HOST_WIDE_INT);
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/* Standard round to integer value functions. */
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extern void real_trunc (REAL_VALUE_TYPE *, enum machine_mode,
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const REAL_VALUE_TYPE *);
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extern void real_floor (REAL_VALUE_TYPE *, enum machine_mode,
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const REAL_VALUE_TYPE *);
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extern void real_ceil (REAL_VALUE_TYPE *, enum machine_mode,
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const REAL_VALUE_TYPE *);
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extern void real_round (REAL_VALUE_TYPE *, enum machine_mode,
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const REAL_VALUE_TYPE *);
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/* Set the sign of R to the sign of X. */
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extern void real_copysign (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
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#endif /* ! GCC_REAL_H */
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