Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 488 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/real.h b/gcc-4.9/gcc/real.h
new file mode 100644
index 000000000..ff0c523b6
--- /dev/null
+++ b/gcc-4.9/gcc/real.h
@@ -0,0 +1,488 @@
+/* Definitions of floating-point access for GNU compiler.
+   Copyright (C) 1989-2014 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
+
+#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 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;
+  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)
+
+/* 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 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;
+extern const struct real_format ieee_half_format;
+extern const struct real_format arm_half_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_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)
+
+#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, -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);
+
+/* 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 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 */