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-/* Definitions of floating-point access for GNU compiler.
- Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998, 1999,
- 2000, 2002, 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
-
-#ifndef GCC_REAL_H
-#define GCC_REAL_H
-
-#include "machmode.h"
-
-/* An expanded form of the represented number. */
-
-/* Enumerate the special cases of numbers that we encounter. */
-enum real_value_class {
- rvc_zero,
- rvc_normal,
- rvc_inf,
- rvc_nan
-};
-
-#define SIGNIFICAND_BITS (128 + HOST_BITS_PER_LONG)
-#define EXP_BITS (32 - 6)
-#define MAX_EXP ((1 << (EXP_BITS - 1)) - 1)
-#define SIGSZ (SIGNIFICAND_BITS / HOST_BITS_PER_LONG)
-#define SIG_MSB ((unsigned long)1 << (HOST_BITS_PER_LONG - 1))
-
-struct real_value GTY(())
-{
- /* Use the same underlying type for all bit-fields, so as to make
- sure they're packed together, otherwise REAL_VALUE_TYPE_SIZE will
- be miscomputed. */
- unsigned int /* ENUM_BITFIELD (real_value_class) */ cl : 2;
- unsigned int decimal : 1;
- unsigned int sign : 1;
- unsigned int signalling : 1;
- unsigned int canonical : 1;
- unsigned int uexp : EXP_BITS;
- unsigned long sig[SIGSZ];
-};
-
-#define REAL_EXP(REAL) \
- ((int)((REAL)->uexp ^ (unsigned int)(1 << (EXP_BITS - 1))) \
- - (1 << (EXP_BITS - 1)))
-#define SET_REAL_EXP(REAL, EXP) \
- ((REAL)->uexp = ((unsigned int)(EXP) & (unsigned int)((1 << EXP_BITS) - 1)))
-
-/* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it
- needs to be a macro. We do need to continue to have a structure tag
- so that other headers can forward declare it. */
-#define REAL_VALUE_TYPE struct real_value
-
-/* We store a REAL_VALUE_TYPE into an rtx, and we do this by putting it in
- consecutive "w" slots. Moreover, we've got to compute the number of "w"
- slots at preprocessor time, which means we can't use sizeof. Guess. */
-
-#define REAL_VALUE_TYPE_SIZE (SIGNIFICAND_BITS + 32)
-#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 */
-
-/* Verify the guess. */
-extern char test_real_width
- [sizeof(REAL_VALUE_TYPE) <= REAL_WIDTH*sizeof(HOST_WIDE_INT) ? 1 : -1];
-
-/* 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 four (32-bit HOST_WIDE_INT, 128-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
-# if REAL_WIDTH == 6
-# define CONST_DOUBLE_FORMAT "wwwwww"
-# else
- #error "REAL_WIDTH > 6 not supported"
-# endif
-# endif
-# endif
-# endif
-# endif
-#endif
-
-
-/* Describes the properties of the specific target format in use. */
-struct real_format
-{
- /* Move to and from the target bytes. */
- void (*encode) (const struct real_format *, long *,
- const REAL_VALUE_TYPE *);
- void (*decode) (const struct real_format *, REAL_VALUE_TYPE *,
- const long *);
-
- /* The radix of the exponent and digits of the significand. */
- int b;
-
- /* log2(b). */
- int log2_b;
-
- /* Size of the significand in digits of radix B. */
- int p;
-
- /* Size of the significant of a NaN, in digits of radix B. */
- int pnan;
-
- /* The minimum negative integer, x, such that b**(x-1) is normalized. */
- int emin;
-
- /* The maximum integer, x, such that b**(x-1) is representable. */
- int emax;
-
- /* The bit position of the sign bit, for determining whether a value
- is positive/negative, or -1 for a complex encoding. */
- int signbit_ro;
-
- /* The bit position of the sign bit, for changing the sign of a number,
- or -1 for a complex encoding. */
- int signbit_rw;
-
- /* Properties of the format. */
- bool has_nans;
- bool has_inf;
- bool has_denorm;
- bool has_signed_zero;
- bool qnan_msb_set;
-};
-
-
-/* The target format used for each floating point mode.
- Float modes are followed by decimal float modes, with entries for
- float modes indexed by (MODE - first float mode), and entries for
- decimal float modes indexed by (MODE - first decimal float mode) +
- the number of float modes. */
-extern const struct real_format *
- real_format_for_mode[MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1
- + MAX_MODE_DECIMAL_FLOAT - MIN_MODE_DECIMAL_FLOAT + 1];
-
-#define REAL_MODE_FORMAT(MODE) \
- (real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE) \
- ? ((MODE - MIN_MODE_DECIMAL_FLOAT) \
- + (MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1)) \
- : (MODE - MIN_MODE_FLOAT)])
-
-/* The following macro determines whether the floating point format is
- composite, i.e. may contain non-consecutive mantissa bits, in which
- case compile-time FP overflow may not model run-time overflow. */
-#define REAL_MODE_FORMAT_COMPOSITE_P(MODE) \
- ((REAL_MODE_FORMAT(MODE))->pnan < (REAL_MODE_FORMAT (MODE))->p)
-
-/* Declare functions in real.c. */
-
-/* Binary or unary arithmetic on tree_code. */
-extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *,
- const REAL_VALUE_TYPE *);
-
-/* Compare reals by tree_code. */
-extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
-
-/* Determine whether a floating-point value X is infinite. */
-extern bool real_isinf (const REAL_VALUE_TYPE *);
-
-/* Determine whether a floating-point value X is a NaN. */
-extern bool real_isnan (const REAL_VALUE_TYPE *);
-
-/* Determine whether a floating-point value X is negative. */
-extern bool real_isneg (const REAL_VALUE_TYPE *);
-
-/* Determine whether a floating-point value X is minus zero. */
-extern bool real_isnegzero (const REAL_VALUE_TYPE *);
-
-/* Compare two floating-point objects for bitwise identity. */
-extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
-
-/* Extend or truncate to a new mode. */
-extern void real_convert (REAL_VALUE_TYPE *, enum machine_mode,
- const REAL_VALUE_TYPE *);
-
-/* Return true if truncating to NEW is exact. */
-extern bool exact_real_truncate (enum machine_mode, const REAL_VALUE_TYPE *);
-
-/* Render R as a decimal floating point constant. */
-extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t,
- size_t, int);
-
-/* Render R as a hexadecimal floating point constant. */
-extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *,
- size_t, size_t, int);
-
-/* Render R as an integer. */
-extern HOST_WIDE_INT real_to_integer (const REAL_VALUE_TYPE *);
-extern void real_to_integer2 (HOST_WIDE_INT *, HOST_WIDE_INT *,
- const REAL_VALUE_TYPE *);
-
-/* Initialize R from a decimal or hexadecimal string. */
-extern void real_from_string (REAL_VALUE_TYPE *, const char *);
-/* Wrapper to allow different internal representation for decimal floats. */
-extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, enum machine_mode);
-
-/* Initialize R from an integer pair HIGH/LOW. */
-extern void real_from_integer (REAL_VALUE_TYPE *, enum machine_mode,
- unsigned HOST_WIDE_INT, HOST_WIDE_INT, int);
-
-extern long real_to_target_fmt (long *, const REAL_VALUE_TYPE *,
- const struct real_format *);
-extern long real_to_target (long *, const REAL_VALUE_TYPE *, enum machine_mode);
-
-extern void real_from_target_fmt (REAL_VALUE_TYPE *, const long *,
- const struct real_format *);
-extern void real_from_target (REAL_VALUE_TYPE *, const long *,
- enum machine_mode);
-
-extern void real_inf (REAL_VALUE_TYPE *);
-
-extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, enum machine_mode);
-
-extern void real_maxval (REAL_VALUE_TYPE *, int, enum machine_mode);
-
-extern void real_2expN (REAL_VALUE_TYPE *, int);
-
-extern unsigned int real_hash (const REAL_VALUE_TYPE *);
-
-
-/* Target formats defined in real.c. */
-extern const struct real_format ieee_single_format;
-extern const struct real_format mips_single_format;
-extern const struct real_format ieee_double_format;
-extern const struct real_format mips_double_format;
-extern const struct real_format ieee_extended_motorola_format;
-extern const struct real_format ieee_extended_intel_96_format;
-extern const struct real_format ieee_extended_intel_96_round_53_format;
-extern const struct real_format ieee_extended_intel_128_format;
-extern const struct real_format ibm_extended_format;
-extern const struct real_format mips_extended_format;
-extern const struct real_format ieee_quad_format;
-extern const struct real_format mips_quad_format;
-extern const struct real_format vax_f_format;
-extern const struct real_format vax_d_format;
-extern const struct real_format vax_g_format;
-extern const struct real_format i370_single_format;
-extern const struct real_format i370_double_format;
-extern const struct real_format c4x_single_format;
-extern const struct real_format c4x_extended_format;
-extern const struct real_format real_internal_format;
-extern const struct real_format decimal_single_format;
-extern const struct real_format decimal_double_format;
-extern const struct real_format decimal_quad_format;
-
-
-/* ====================================================================== */
-/* Crap. */
-
-#define REAL_ARITHMETIC(value, code, d1, d2) \
- real_arithmetic (&(value), code, &(d1), &(d2))
-
-#define REAL_VALUES_IDENTICAL(x, y) real_identical (&(x), &(y))
-#define REAL_VALUES_EQUAL(x, y) real_compare (EQ_EXPR, &(x), &(y))
-#define REAL_VALUES_LESS(x, y) real_compare (LT_EXPR, &(x), &(y))
-
-/* Determine whether a floating-point value X is infinite. */
-#define REAL_VALUE_ISINF(x) real_isinf (&(x))
-
-/* Determine whether a floating-point value X is a NaN. */
-#define REAL_VALUE_ISNAN(x) real_isnan (&(x))
-
-/* Determine whether a floating-point value X is negative. */
-#define REAL_VALUE_NEGATIVE(x) real_isneg (&(x))
-
-/* Determine whether a floating-point value X is minus zero. */
-#define REAL_VALUE_MINUS_ZERO(x) real_isnegzero (&(x))
-
-/* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
-#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \
- real_to_target (OUT, &(IN), \
- mode_for_size (LONG_DOUBLE_TYPE_SIZE, MODE_FLOAT, 0))
-
-#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
- real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0))
-
-/* IN is a REAL_VALUE_TYPE. OUT is a long. */
-#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
- ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0)))
-
-#define REAL_VALUE_FROM_INT(r, lo, hi, mode) \
- real_from_integer (&(r), mode, lo, hi, 0)
-
-#define REAL_VALUE_FROM_UNSIGNED_INT(r, lo, hi, mode) \
- real_from_integer (&(r), mode, lo, hi, 1)
-
-/* Real values to IEEE 754R decimal floats. */
-
-/* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
-#define REAL_VALUE_TO_TARGET_DECIMAL128(IN, OUT) \
- real_to_target (OUT, &(IN), mode_for_size (128, MODE_DECIMAL_FLOAT, 0))
-
-#define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \
- real_to_target (OUT, &(IN), mode_for_size (64, MODE_DECIMAL_FLOAT, 0))
-
-/* IN is a REAL_VALUE_TYPE. OUT is a long. */
-#define REAL_VALUE_TO_TARGET_DECIMAL32(IN, OUT) \
- ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_DECIMAL_FLOAT, 0)))
-
-extern REAL_VALUE_TYPE real_value_truncate (enum machine_mode,
- REAL_VALUE_TYPE);
-
-#define REAL_VALUE_TO_INT(plow, phigh, r) \
- real_to_integer2 (plow, phigh, &(r))
-
-extern REAL_VALUE_TYPE real_arithmetic2 (int, const REAL_VALUE_TYPE *,
- const REAL_VALUE_TYPE *);
-
-#define REAL_VALUE_NEGATE(X) \
- real_arithmetic2 (NEGATE_EXPR, &(X), NULL)
-
-#define REAL_VALUE_ABS(X) \
- real_arithmetic2 (ABS_EXPR, &(X), NULL)
-
-extern int significand_size (enum machine_mode);
-
-extern REAL_VALUE_TYPE real_from_string2 (const char *, enum machine_mode);
-
-#define REAL_VALUE_ATOF(s, m) \
- real_from_string2 (s, m)
-
-#define CONST_DOUBLE_ATOF(s, m) \
- CONST_DOUBLE_FROM_REAL_VALUE (real_from_string2 (s, m), m)
-
-#define REAL_VALUE_FIX(r) \
- real_to_integer (&(r))
-
-/* ??? Not quite right. */
-#define REAL_VALUE_UNSIGNED_FIX(r) \
- real_to_integer (&(r))
-
-/* ??? These were added for Paranoia support. */
-
-/* Return floor log2(R). */
-extern int real_exponent (const REAL_VALUE_TYPE *);
-
-/* R = A * 2**EXP. */
-extern void real_ldexp (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *, int);
-
-/* **** End of software floating point emulator interface macros **** */
-
-/* Constant real values 0, 1, 2, 3, 10, -1, -2, 0.5 and 1/3. */
-
-extern REAL_VALUE_TYPE dconst0;
-extern REAL_VALUE_TYPE dconst1;
-extern REAL_VALUE_TYPE dconst2;
-extern REAL_VALUE_TYPE dconst3;
-extern REAL_VALUE_TYPE dconst10;
-extern REAL_VALUE_TYPE dconstm1;
-extern REAL_VALUE_TYPE dconstm2;
-extern REAL_VALUE_TYPE dconsthalf;
-extern REAL_VALUE_TYPE dconstthird;
-extern REAL_VALUE_TYPE dconstpi;
-extern REAL_VALUE_TYPE dconste;
-
-/* Function to return a real value (not a tree node)
- from a given integer constant. */
-REAL_VALUE_TYPE real_value_from_int_cst (tree, tree);
-
-/* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
-#define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
- ((to) = *CONST_DOUBLE_REAL_VALUE (from))
-
-/* 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 (REAL_VALUE_TYPE, enum machine_mode);
-
-/* Replace R by 1/R in the given machine mode, if the result is exact. */
-extern bool exact_real_inverse (enum machine_mode, REAL_VALUE_TYPE *);
-
-/* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */
-extern tree build_real (tree, REAL_VALUE_TYPE);
-
-/* Calculate R as the square root of X in the given machine mode. */
-extern bool real_sqrt (REAL_VALUE_TYPE *, enum machine_mode,
- const REAL_VALUE_TYPE *);
-
-/* Calculate R as X raised to the integer exponent N in mode MODE. */
-extern bool real_powi (REAL_VALUE_TYPE *, enum machine_mode,
- const REAL_VALUE_TYPE *, HOST_WIDE_INT);
-
-/* Standard round to integer value functions. */
-extern void real_trunc (REAL_VALUE_TYPE *, enum machine_mode,
- const REAL_VALUE_TYPE *);
-extern void real_floor (REAL_VALUE_TYPE *, enum machine_mode,
- const REAL_VALUE_TYPE *);
-extern void real_ceil (REAL_VALUE_TYPE *, enum machine_mode,
- const REAL_VALUE_TYPE *);
-extern void real_round (REAL_VALUE_TYPE *, enum machine_mode,
- const REAL_VALUE_TYPE *);
-
-/* Set the sign of R to the sign of X. */
-extern void real_copysign (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
-
-#endif /* ! GCC_REAL_H */