X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Freal.h;h=9809004ab1695ecf672236fba06e77b175ca6ed0;hb=87943377315aebb9dbe539bae0a87829a6c22071;hp=e897098507c561ef57d12234afbcef3df8bb51ea;hpb=0021bea918bd779cbc3984e27551dc723364b434;p=pf3gnuchains%2Fgcc-fork.git
diff --git a/gcc/real.h b/gcc/real.h
index e897098507c..9809004ab16 100644
--- a/gcc/real.h
+++ b/gcc/real.h
@@ -1,12 +1,12 @@
/* Definitions of floating-point access for GNU compiler.
Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998, 1999,
- 2000, 2002, 2003 Free Software Foundation, Inc.
+ 2000, 2002, 2003, 2004, 2005, 2007, 2008 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
+ Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
@@ -15,13 +15,16 @@
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. */
+ along with GCC; see the file COPYING3. If not see
+ . */
#ifndef GCC_REAL_H
#define GCC_REAL_H
+#ifndef GENERATOR_FILE
+#include
+#include
+#endif
#include "machmode.h"
/* An expanded form of the represented number. */
@@ -35,21 +38,31 @@ enum real_value_class {
};
#define SIGNIFICAND_BITS (128 + HOST_BITS_PER_LONG)
-#define EXP_BITS (32 - 5)
+#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(())
{
- ENUM_BITFIELD (real_value_class) class : 2;
+ /* 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;
- signed int exp : EXP_BITS;
+ 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. */
@@ -114,9 +127,6 @@ struct real_format
/* 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;
@@ -129,8 +139,13 @@ struct real_format
/* The maximum integer, x, such that b**(x-1) is representable. */
int emax;
- /* The bit position of the sign bit, or -1 for a complex encoding. */
- int signbit;
+ /* 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;
@@ -138,19 +153,35 @@ struct real_format
bool has_denorm;
bool has_signed_zero;
bool qnan_msb_set;
+ bool canonical_nan_lsbs_set;
};
-/* The target format used for each floating floating point mode.
- Indexed by MODE - QFmode. */
-extern const struct real_format *real_format_for_mode[TFmode - QFmode + 1];
+/* 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)])
-#define REAL_MODE_FORMAT(MODE) (real_format_for_mode[(MODE) - QFmode])
+/* 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 void real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *,
+extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *,
const REAL_VALUE_TYPE *);
/* Compare reals by tree_code. */
@@ -162,6 +193,9 @@ 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 finite. */
+extern bool real_isfinite (const REAL_VALUE_TYPE *);
+
/* Determine whether a floating-point value X is negative. */
extern bool real_isneg (const REAL_VALUE_TYPE *);
@@ -191,8 +225,11 @@ 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 *);
+/* Initialize R from a decimal or hexadecimal string. Return -1 if
+ the value underflows, +1 if overflows, and 0 otherwise. */
+extern int 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,
@@ -213,7 +250,7 @@ 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 void real_2expN (REAL_VALUE_TYPE *, int, enum machine_mode);
extern unsigned int real_hash (const REAL_VALUE_TYPE *);
@@ -221,8 +258,10 @@ 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 motorola_single_format;
extern const struct real_format ieee_double_format;
extern const struct real_format mips_double_format;
+extern const struct real_format motorola_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;
@@ -234,11 +273,10 @@ 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;
/* ====================================================================== */
@@ -281,6 +319,19 @@ extern const struct real_format real_internal_format;
#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);
@@ -323,27 +374,32 @@ 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. */
+/* Constant real values 0, 1, 2, -1 and 0.5. */
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;
+
+/* Enumerate the special constant values we need. */
+enum real_value_const {
+ rv_e,
+ rv_third,
+ rv_sqrt2,
+ rv_max
+};
+
+/* Function to return a real value special constant. */
+extern const REAL_VALUE_TYPE * get_real_const (enum real_value_const);
/* 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);
+REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree);
/* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
#define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
- memcpy (&(to), &CONST_DOUBLE_LOW ((from)), sizeof (REAL_VALUE_TYPE))
+ ((to) = *CONST_DOUBLE_REAL_VALUE (from))
/* Return a CONST_DOUBLE with value R and mode M. */
#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) \
@@ -371,5 +427,25 @@ 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 *);
+
+#ifndef GENERATOR_FILE
+/* Convert between MPFR and REAL_VALUE_TYPE. The caller is
+ responsible for initializing and clearing the MPFR parameter. */
+
+extern void real_from_mpfr (REAL_VALUE_TYPE *, mpfr_srcptr, tree, mp_rnd_t);
+extern void mpfr_from_real (mpfr_ptr, const REAL_VALUE_TYPE *, mp_rnd_t);
+#endif
+
+/* Check whether the real constant value given is an integer. */
+extern bool real_isinteger (const REAL_VALUE_TYPE *c, enum machine_mode mode);
+/* Write into BUF the maximum representable finite floating-point
+ number, (1 - b**-p) * b**emax for a given FP format FMT as a hex
+ float string. BUF must be large enough to contain the result. */
+extern void get_max_float (const struct real_format *, char *, size_t);
#endif /* ! GCC_REAL_H */