--- /dev/null
+/* Definitions of floating-point access for GNU compiler.
+ Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998, 1999,
+ 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 3, 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 COPYING3. If not see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef GCC_REAL_H
+#define GCC_REAL_H
+
+#ifndef GENERATOR_FILE
+#include <gmp.h>
+#include <mpfr.h>
+#endif
+#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;
+
+ /* 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 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)
+
+
+/* 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 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 *);
+
+/* 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 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 (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. 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,
+ 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, enum machine_mode);
+
+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 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 754 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 **** */
+\f
+/* 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 (const_tree, const_tree);
+
+bool real_from_native (tree, const unsigned char *, int, REAL_VALUE_TYPE *);
+
+/* 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 *);
+
+/* 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 *);
+
+#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 */
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