X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Freal.h;h=d16dc249de90d5f1a1ca7e83a40aa123a41d9ab7;hb=56adb3e07395775f28297364632248fa1883466f;hp=59340f7d905cbe9547e57f779e2e0bf38147ddc3;hpb=0b5213559d10fca2937b4ef8c9722523bc29648b;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/real.h b/gcc/real.h index 59340f7d905..d16dc249de9 100644 --- a/gcc/real.h +++ b/gcc/real.h @@ -1,12 +1,13 @@ /* Definitions of floating-point access for GNU compiler. - Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998, - 1999, 2000, 2002 Free Software Foundation, Inc. + Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998, 1999, + 2000, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010 + 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 @@ -15,9 +16,8 @@ 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 @@ -35,19 +35,30 @@ enum real_value_class { }; #define SIGNIFICAND_BITS (128 + HOST_BITS_PER_LONG) -#define EXP_BITS (32 - 3) +#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; +struct GTY(()) real_value { + /* 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; - signed int exp : EXP_BITS; + 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. */ @@ -104,133 +115,218 @@ extern char test_real_width struct real_format { /* Move to and from the target bytes. */ - void (*encode) PARAMS ((const struct real_format *, long *, - const REAL_VALUE_TYPE *)); - void (*decode) PARAMS ((const struct real_format *, REAL_VALUE_TYPE *, - const long *)); + 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; + + /* Default rounding mode for operations on this format. */ + bool round_towards_zero; + bool has_sign_dependent_rounding; + /* Properties of the format. */ bool has_nans; bool has_inf; 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 FLOAT_MODE_FORMAT(MODE) \ + (REAL_MODE_FORMAT (SCALAR_FLOAT_MODE_P (MODE)? (MODE) \ + : GET_MODE_INNER (MODE))) + +/* 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 MODE_COMPOSITE_P(MODE) \ + (FLOAT_MODE_P (MODE) \ + && FLOAT_MODE_FORMAT (MODE)->pnan < FLOAT_MODE_FORMAT (MODE)->p) + +/* Accessor macros for format properties. */ +#define MODE_HAS_NANS(MODE) \ + (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_nans) +#define MODE_HAS_INFINITIES(MODE) \ + (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_inf) +#define MODE_HAS_SIGNED_ZEROS(MODE) \ + (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_signed_zero) +#define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE) \ + (FLOAT_MODE_P (MODE) \ + && FLOAT_MODE_FORMAT (MODE)->has_sign_dependent_rounding) + +/* True if the given mode has a NaN representation and the treatment of + NaN operands is important. Certain optimizations, such as folding + x * 0 into 0, are not correct for NaN operands, and are normally + disabled for modes with NaNs. The user can ask for them to be + done anyway using the -funsafe-math-optimizations switch. */ +#define HONOR_NANS(MODE) \ + (MODE_HAS_NANS (MODE) && !flag_finite_math_only) + +/* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */ +#define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE)) + +/* As for HONOR_NANS, but true if the mode can represent infinity and + the treatment of infinite values is important. */ +#define HONOR_INFINITIES(MODE) \ + (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only) + +/* Like HONOR_NANS, but true if the given mode distinguishes between + positive and negative zero, and the sign of zero is important. */ +#define HONOR_SIGNED_ZEROS(MODE) \ + (MODE_HAS_SIGNED_ZEROS (MODE) && flag_signed_zeros) + +/* Like HONOR_NANS, but true if given mode supports sign-dependent rounding, + and the rounding mode is important. */ +#define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \ + (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math) /* Declare functions in real.c. */ /* Binary or unary arithmetic on tree_code. */ -extern void real_arithmetic PARAMS ((REAL_VALUE_TYPE *, int, - const REAL_VALUE_TYPE *, - 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. */ -extern bool real_compare PARAMS ((int, const REAL_VALUE_TYPE *, - const REAL_VALUE_TYPE *)); +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 PARAMS ((const REAL_VALUE_TYPE *)); +extern bool real_isinf (const REAL_VALUE_TYPE *); /* Determine whether a floating-point value X is a NaN. */ -extern bool real_isnan PARAMS ((const REAL_VALUE_TYPE *)); +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 PARAMS ((const REAL_VALUE_TYPE *)); +extern bool real_isneg (const REAL_VALUE_TYPE *); /* Determine whether a floating-point value X is minus zero. */ -extern bool real_isnegzero PARAMS ((const REAL_VALUE_TYPE *)); +extern bool real_isnegzero (const REAL_VALUE_TYPE *); /* Compare two floating-point objects for bitwise identity. */ -extern bool real_identical PARAMS ((const REAL_VALUE_TYPE *, - const REAL_VALUE_TYPE *)); +extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); /* Extend or truncate to a new mode. */ -extern void real_convert PARAMS ((REAL_VALUE_TYPE *, - enum machine_mode, - const REAL_VALUE_TYPE *)); +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 PARAMS ((enum machine_mode, - const REAL_VALUE_TYPE *)); +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 PARAMS ((char *, const REAL_VALUE_TYPE *, - int)); +extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t, + size_t, int); + +/* Render R as a decimal floating point constant, rounded so as to be + parsed back to the same value when interpreted in mode MODE. */ +extern void real_to_decimal_for_mode (char *, const REAL_VALUE_TYPE *, size_t, + size_t, int, enum machine_mode); /* Render R as a hexadecimal floating point constant. */ -extern void real_to_hexadecimal PARAMS ((char *, const REAL_VALUE_TYPE *, - int)); +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 PARAMS ((const REAL_VALUE_TYPE *)); -extern void real_to_integer2 PARAMS ((HOST_WIDE_INT *, HOST_WIDE_INT *, - const REAL_VALUE_TYPE *)); +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 PARAMS ((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 PARAMS ((REAL_VALUE_TYPE *, - enum machine_mode, - unsigned HOST_WIDE_INT, - HOST_WIDE_INT, int)); +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 long real_to_target_fmt PARAMS ((long *, const REAL_VALUE_TYPE *, - const struct real_format *)); -extern long real_to_target PARAMS ((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_from_target_fmt PARAMS ((REAL_VALUE_TYPE *, const long *, - const struct real_format *)); -extern void real_from_target PARAMS ((REAL_VALUE_TYPE *, const long *, - enum machine_mode)); +extern void real_inf (REAL_VALUE_TYPE *); -extern void real_inf PARAMS ((REAL_VALUE_TYPE *)); +extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, enum machine_mode); -extern bool real_nan PARAMS ((REAL_VALUE_TYPE *, const char *, - int, enum machine_mode)); +extern void real_maxval (REAL_VALUE_TYPE *, int, enum machine_mode); -extern void real_2expN PARAMS ((REAL_VALUE_TYPE *, int)); +extern void real_2expN (REAL_VALUE_TYPE *, int, enum machine_mode); -extern unsigned int real_hash PARAMS ((const REAL_VALUE_TYPE *)); +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 spu_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; 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; +extern const struct real_format ieee_half_format; +extern const struct real_format arm_half_format; /* ====================================================================== */ @@ -267,34 +363,37 @@ extern const struct real_format c4x_extended_format; #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \ ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0))) -#define REAL_VALUE_TO_DECIMAL(r, s, dig) \ - real_to_decimal (s, &(r), dig) - #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) -extern REAL_VALUE_TYPE real_value_truncate PARAMS ((enum machine_mode, - REAL_VALUE_TYPE)); +/* Real values to IEEE 754 decimal floats. */ -#define REAL_VALUE_TO_INT(plow, phigh, r) \ - real_to_integer2 (plow, phigh, &(r)) +/* 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)) -extern REAL_VALUE_TYPE real_arithmetic2 PARAMS ((int, const REAL_VALUE_TYPE *, - const REAL_VALUE_TYPE *)); +#define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \ + real_to_target (OUT, &(IN), mode_for_size (64, MODE_DECIMAL_FLOAT, 0)) -#define REAL_VALUE_NEGATE(X) \ - real_arithmetic2 (NEGATE_EXPR, &(X), NULL) +/* 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))) -#define REAL_VALUE_ABS(X) \ - real_arithmetic2 (ABS_EXPR, &(X), NULL) +extern REAL_VALUE_TYPE real_value_truncate (enum machine_mode, + REAL_VALUE_TYPE); -extern int significand_size PARAMS ((enum machine_mode)); +#define REAL_VALUE_TO_INT(plow, phigh, r) \ + real_to_integer2 (plow, phigh, &(r)) -extern REAL_VALUE_TYPE real_from_string2 PARAMS ((const char *, - enum machine_mode)); +extern REAL_VALUE_TYPE real_value_negate (const REAL_VALUE_TYPE *); +extern REAL_VALUE_TYPE real_value_abs (const REAL_VALUE_TYPE *); + +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) @@ -312,41 +411,84 @@ extern REAL_VALUE_TYPE real_from_string2 PARAMS ((const char *, /* ??? These were added for Paranoia support. */ /* Return floor log2(R). */ -extern int real_exponent PARAMS ((const REAL_VALUE_TYPE *)); +extern int real_exponent (const REAL_VALUE_TYPE *); /* R = A * 2**EXP. */ -extern void real_ldexp PARAMS ((REAL_VALUE_TYPE *, - const REAL_VALUE_TYPE *, int)); +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, and -1. */ +/* 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 dconstm1; +extern REAL_VALUE_TYPE dconsthalf; + +#define dconst_e() (*dconst_e_ptr ()) +#define dconst_third() (*dconst_third_ptr ()) +#define dconst_sqrt2() (*dconst_sqrt2_ptr ()) + +/* Function to return the real value special constant 'e'. */ +extern const REAL_VALUE_TYPE * dconst_e_ptr (void); + +/* Returns the special REAL_VALUE_TYPE corresponding to 1/3. */ +extern const REAL_VALUE_TYPE * dconst_third_ptr (void); + +/* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2). */ +extern const REAL_VALUE_TYPE * dconst_sqrt2_ptr (void); /* Function to return a real value (not a tree node) from a given integer constant. */ -REAL_VALUE_TYPE real_value_from_int_cst PARAMS ((union tree_node *, - union tree_node *)); +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) \ const_double_from_real_value (r, m) -extern rtx const_double_from_real_value PARAMS ((REAL_VALUE_TYPE, - enum machine_mode)); +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 PARAMS ((enum machine_mode, REAL_VALUE_TYPE *)); - -/* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */ -extern tree build_real PARAMS ((tree, REAL_VALUE_TYPE)); +extern bool exact_real_inverse (enum machine_mode, REAL_VALUE_TYPE *); +/* Return true if arithmetic on values in IMODE that were promoted + from values in TMODE is equivalent to direct arithmetic on values + in TMODE. */ +bool real_can_shorten_arithmetic (enum machine_mode, enum machine_mode); +/* 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 *); + +/* 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 */