X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Freal.h;h=5c4e9c605d81eeb78576e2731171da1cfebe37d2;hb=e551bd1a627721943b25c270a38b7f3e7df8f647;hp=31fa56140a9de10c53f0d863290ad3c97b71c1fc;hpb=aa870c1bd9a934cad1315b215c0bbcaf7858b6f5;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/real.h b/gcc/real.h index 31fa56140a9..5c4e9c605d8 100644 --- a/gcc/real.h +++ b/gcc/real.h @@ -1,6 +1,6 @@ /* 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 Free Software Foundation, Inc. This file is part of GCC. @@ -24,26 +24,58 @@ #include "machmode.h" -/* REAL_VALUE_TYPE is an array of the minimum number of HOST_WIDE_INTs - required to hold a 128-bit floating point type. This is true even - if the maximum precision floating point type on the target is smaller. +/* An expanded form of the represented number. */ - The extra 32 bits are for storing the mode of the float. Ideally - we'd keep this elsewhere, but that's too drastic a change all at once. */ +/* 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 - 5) +#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 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 -#define REAL_VALUE_TYPE_SIZE (128 + 32) +/* 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 */ -struct realvaluetype GTY(()) { - HOST_WIDE_INT r[REAL_WIDTH]; -}; - -/* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it needs - to be a macro. realvaluetype cannot be a typedef as this interferes with - other headers declaring opaque pointers to it. */ -#define REAL_VALUE_TYPE struct realvaluetype +/* 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 @@ -67,102 +99,166 @@ struct realvaluetype GTY(()) { # if REAL_WIDTH == 5 # define CONST_DOUBLE_FORMAT "wwwww" # else - #error "REAL_WIDTH > 5 not supported" +# if REAL_WIDTH == 6 +# define CONST_DOUBLE_FORMAT "wwwwww" +# else + #error "REAL_WIDTH > 6 not supported" +# endif # endif # endif # endif # endif #endif -/* Declare functions in real.c. */ -/* Initialize the emulator. */ -extern void init_real_once PARAMS ((void)); +/* 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, or -1 for a complex encoding. */ + int signbit; + + /* 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 floating point mode. + Indexed by MODE - QFmode. */ +extern const struct real_format * + real_format_for_mode[MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1]; + +#define REAL_MODE_FORMAT(MODE) (real_format_for_mode[(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 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 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 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 *)); +extern void real_from_string (REAL_VALUE_TYPE *, const char *); /* 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 PARAMS ((long *, const REAL_VALUE_TYPE *, - enum machine_mode)); +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 PARAMS ((REAL_VALUE_TYPE *, const long *, - 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 PARAMS ((REAL_VALUE_TYPE *)); +extern void real_inf (REAL_VALUE_TYPE *); -extern void real_nan PARAMS ((REAL_VALUE_TYPE *, const char *, - int, enum machine_mode)); +extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, enum machine_mode); -extern void real_2expN PARAMS ((REAL_VALUE_TYPE *, int)); +extern void real_maxval (REAL_VALUE_TYPE *, int, enum machine_mode); -/* ====================================================================== */ -/* Crap. */ +extern void real_2expN (REAL_VALUE_TYPE *, int); -/* Define codes for all the float formats that we know of. */ -#define UNKNOWN_FLOAT_FORMAT 0 -#define IEEE_FLOAT_FORMAT 1 -#define VAX_FLOAT_FORMAT 2 -#define IBM_FLOAT_FORMAT 3 -#define C4X_FLOAT_FORMAT 4 +extern unsigned int real_hash (const REAL_VALUE_TYPE *); -/* Default to IEEE float if not specified. Nearly all machines use it. */ -#ifndef TARGET_FLOAT_FORMAT -#define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT -#endif +/* 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; + + +/* ====================================================================== */ +/* Crap. */ #define REAL_ARITHMETIC(value, code, d1, d2) \ real_arithmetic (&(value), code, &(d1), &(d2)) @@ -195,23 +291,20 @@ extern void real_2expN PARAMS ((REAL_VALUE_TYPE *, int)); #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)); +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 PARAMS ((int, const REAL_VALUE_TYPE *, - const REAL_VALUE_TYPE *)); +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) @@ -219,10 +312,9 @@ extern REAL_VALUE_TYPE real_arithmetic2 PARAMS ((int, const REAL_VALUE_TYPE *, #define REAL_VALUE_ABS(X) \ real_arithmetic2 (ABS_EXPR, &(X), NULL) -extern int significand_size PARAMS ((enum machine_mode)); +extern int significand_size (enum machine_mode); -extern REAL_VALUE_TYPE real_from_string2 PARAMS ((const char *, - 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) @@ -240,25 +332,30 @@ 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, 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 PARAMS ((union tree_node *, - union tree_node *)); +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) \ @@ -267,14 +364,33 @@ REAL_VALUE_TYPE real_value_from_int_cst PARAMS ((union tree_node *, /* 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 *)); +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 PARAMS ((tree, REAL_VALUE_TYPE)); - +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 */