X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=blobdiff_plain;f=gcc%2Freal.h;h=e482c888f34da044562004ebcbc29e2f1a2e30a1;hp=848ef184f2f72fc53dc1b66a1d307761da7f8241;hb=99c77e3269d98e7f598895ae3a9f3ee34dc7b9e6;hpb=c5aa1e92211d8e1c3768a94c7a1fcf7e72e8cf80

diff --git a/gcc/real.h b/gcc/real.h
index 848ef184f2f..e482c888f34 100644
--- a/gcc/real.h
+++ b/gcc/real.h
@@ -1,471 +1,442 @@
 /* Definitions of floating-point access for GNU compiler.
-   Copyright (C) 1989, 1991, 1994, 1996, 1997 Free Software Foundation, Inc.
+   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 GNU CC.
+   This file is part of GCC.
 
-GNU CC 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 version.
+   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.
 
-GNU CC 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.
+   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 GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
+   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 REAL_H_INCLUDED
-#define REAL_H_INCLUDED
+#ifndef GCC_REAL_H
+#define GCC_REAL_H
 
-/* 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
+#include <gmp.h>
+#include <mpfr.h>
+#include "machmode.h"
 
-/* Default to IEEE float if not specified.  Nearly all machines use it.  */
+/* An expanded form of the represented number.  */
 
-#ifndef TARGET_FLOAT_FORMAT
-#define	TARGET_FLOAT_FORMAT	IEEE_FLOAT_FORMAT
-#endif
+/* Enumerate the special cases of numbers that we encounter.  */
+enum real_value_class {
+  rvc_zero,
+  rvc_normal,
+  rvc_inf,
+  rvc_nan
+};
 
-#ifndef HOST_FLOAT_FORMAT
-#define	HOST_FLOAT_FORMAT	IEEE_FLOAT_FORMAT
-#endif
+#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))
 
-#if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
-#define REAL_INFINITY
-#endif
+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];
+};
 
-/* If FLOAT_WORDS_BIG_ENDIAN and HOST_FLOAT_WORDS_BIG_ENDIAN are not defined
-   in the header files, then this implies the word-endianness is the same as
-   for integers.  */
+#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)))
 
-/* This is defined 0 or 1, like WORDS_BIG_ENDIAN.  */
-#ifndef FLOAT_WORDS_BIG_ENDIAN
-#define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
-#endif
+/* 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
 
-/* This is defined 0 or 1, unlike HOST_WORDS_BIG_ENDIAN.  */
-#ifndef HOST_FLOAT_WORDS_BIG_ENDIAN
-#ifdef HOST_WORDS_BIG_ENDIAN
-#define HOST_FLOAT_WORDS_BIG_ENDIAN 1
-#else
-#define HOST_FLOAT_WORDS_BIG_ENDIAN 0
-#endif
-#endif
+/* 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.  */
 
-/* Defining REAL_ARITHMETIC invokes a floating point emulator
-   that can produce a target machine format differing by more
-   than just endian-ness from the host's format.  The emulator
-   is also used to support extended real XFmode.  */
-#ifndef LONG_DOUBLE_TYPE_SIZE
-#define LONG_DOUBLE_TYPE_SIZE 64
-#endif
-#if (LONG_DOUBLE_TYPE_SIZE == 96) || (LONG_DOUBLE_TYPE_SIZE == 128)
-#ifndef REAL_ARITHMETIC
-#define REAL_ARITHMETIC
-#endif
-#endif
-#ifdef REAL_ARITHMETIC
-/* **** Start of software floating point emulator interface macros **** */
-
-/* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE
-   has been defined to be 96 in the tm.h machine file. */
-#if (LONG_DOUBLE_TYPE_SIZE == 96)
-#define REAL_IS_NOT_DOUBLE
-#define REAL_ARITHMETIC
-typedef struct {
-  HOST_WIDE_INT r[(11 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
-} realvaluetype;
-#define REAL_VALUE_TYPE realvaluetype
-
-#else /* no XFmode support */
-
-#if (LONG_DOUBLE_TYPE_SIZE == 128)
-
-#define REAL_IS_NOT_DOUBLE
-#define REAL_ARITHMETIC
-typedef struct {
-  HOST_WIDE_INT r[(19 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
-} realvaluetype;
-#define REAL_VALUE_TYPE realvaluetype
-
-#else /* not TFmode */
-
-#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
-/* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
-   but it is not necessarily a host machine double. */
-#define REAL_IS_NOT_DOUBLE
-typedef struct {
-  HOST_WIDE_INT r[(7 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
-} realvaluetype;
-#define REAL_VALUE_TYPE realvaluetype
-#else
-/* If host and target formats are compatible, then a REAL_VALUE_TYPE
-   is actually a host machine double. */
-#define REAL_VALUE_TYPE double
-#endif
+#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 */
 
-#endif /* no TFmode support */
-#endif /* no XFmode support */
+/* Verify the guess.  */
+extern char test_real_width
+  [sizeof(REAL_VALUE_TYPE) <= REAL_WIDTH*sizeof(HOST_WIDE_INT) ? 1 : -1];
 
-extern int significand_size	PROTO((enum machine_mode));
+/* 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).
 
-/* If emulation has been enabled by defining REAL_ARITHMETIC or by
-   setting LONG_DOUBLE_TYPE_SIZE to 96 or 128, then define macros so that
-   they invoke emulator functions. This will succeed only if the machine
-   files have been updated to use these macros in place of any
-   references to host machine `double' or `float' types.  */
-#ifdef REAL_ARITHMETIC
-#undef REAL_ARITHMETIC
-#define REAL_ARITHMETIC(value, code, d1, d2) \
-  earith (&(value), (code), &(d1), &(d2))
-
-/* Declare functions in real.c. */
-extern void earith		PROTO((REAL_VALUE_TYPE *, int,
-				       REAL_VALUE_TYPE *, REAL_VALUE_TYPE *));
-extern REAL_VALUE_TYPE etrunci	PROTO((REAL_VALUE_TYPE));
-extern REAL_VALUE_TYPE etruncui	PROTO((REAL_VALUE_TYPE));
-extern REAL_VALUE_TYPE ereal_atof PROTO((char *, enum machine_mode));
-extern REAL_VALUE_TYPE ereal_negate PROTO((REAL_VALUE_TYPE));
-extern HOST_WIDE_INT efixi	PROTO((REAL_VALUE_TYPE));
-extern unsigned HOST_WIDE_INT efixui PROTO((REAL_VALUE_TYPE));
-extern void ereal_from_int	PROTO((REAL_VALUE_TYPE *,
-				       HOST_WIDE_INT, HOST_WIDE_INT,
-				       enum machine_mode));
-extern void ereal_from_uint	PROTO((REAL_VALUE_TYPE *,
-				       unsigned HOST_WIDE_INT,
-				       unsigned HOST_WIDE_INT,
-				       enum machine_mode));
-extern void ereal_to_int	PROTO((HOST_WIDE_INT *, HOST_WIDE_INT *,
-				       REAL_VALUE_TYPE));
-extern REAL_VALUE_TYPE ereal_ldexp PROTO((REAL_VALUE_TYPE, int));
-
-extern void etartdouble		PROTO((REAL_VALUE_TYPE, long *));
-extern void etarldouble		PROTO((REAL_VALUE_TYPE, long *));
-extern void etardouble		PROTO((REAL_VALUE_TYPE, long *));
-extern long etarsingle		PROTO((REAL_VALUE_TYPE));
-extern void ereal_to_decimal	PROTO((REAL_VALUE_TYPE, char *));
-extern int ereal_cmp		PROTO((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
-extern int ereal_isneg		PROTO((REAL_VALUE_TYPE));
-extern REAL_VALUE_TYPE ereal_unto_float PROTO((long));
-extern REAL_VALUE_TYPE ereal_unto_double PROTO((long *));
-extern REAL_VALUE_TYPE ereal_from_float PROTO((HOST_WIDE_INT));
-extern REAL_VALUE_TYPE ereal_from_double PROTO((HOST_WIDE_INT *));
-
-#define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
-/* true if x < y : */
-#define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
-#define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
-
-/* These return REAL_VALUE_TYPE: */
-#define REAL_VALUE_RNDZINT(x) (etrunci (x))
-#define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
-extern REAL_VALUE_TYPE real_value_truncate	PROTO ((enum machine_mode,
-							REAL_VALUE_TYPE));
-#define REAL_VALUE_TRUNCATE(mode, x)  real_value_truncate (mode, x)
-
-/* These return HOST_WIDE_INT: */
-/* Convert a floating-point value to integer, rounding toward zero.  */
-#define REAL_VALUE_FIX(x) (efixi (x))
-/* Convert a floating-point value to unsigned integer, rounding
-   toward zero. */
-#define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
-
-#define REAL_VALUE_ATOF ereal_atof
-#define REAL_VALUE_NEGATE ereal_negate
-
-#define REAL_VALUE_MINUS_ZERO(x) \
- ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
-
-#define REAL_VALUE_TO_INT ereal_to_int
-
-/* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0.  */
-#define REAL_VALUE_FROM_INT(d, lo, hi, mode) \
-  ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi), mode)
-
-#define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi, mode) \
-  ereal_from_uint (&d, lo, hi, mode)
-
-/* IN is a REAL_VALUE_TYPE.  OUT is an array of longs. */
-#if LONG_DOUBLE_TYPE_SIZE == 96
-#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
+   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
-#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
-#endif
-#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
+# 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;
+
+  /* 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;
+};
 
-/* IN is a REAL_VALUE_TYPE.  OUT is a long. */
-#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
 
-/* Inverse of REAL_VALUE_TO_TARGET_DOUBLE. */
-#define REAL_VALUE_UNTO_TARGET_DOUBLE(d)  (ereal_unto_double (d))
+/* 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];
 
-/* Inverse of REAL_VALUE_TO_TARGET_SINGLE. */
-#define REAL_VALUE_UNTO_TARGET_SINGLE(f)  (ereal_unto_float (f))
+#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)])
 
-/* d is an array of HOST_WIDE_INT that holds a double precision
-   value in the target computer's floating point format. */
-#define REAL_VALUE_FROM_TARGET_DOUBLE(d)  (ereal_from_double (d))
+/* 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)
 
-/* f is a HOST_WIDE_INT containing a single precision target float value. */
-#define REAL_VALUE_FROM_TARGET_SINGLE(f)  (ereal_from_float (f))
+/* Declare functions in real.c.  */
 
-/* Conversions to decimal ASCII string.  */
-#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
+/* Binary or unary arithmetic on tree_code.  */
+extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *,
+			     const REAL_VALUE_TYPE *);
 
-#endif /* REAL_ARITHMETIC defined */
+/* Compare reals by tree_code.  */
+extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 
-/* **** End of software floating point emulator interface macros **** */
-#else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
-
-/* old interface */
-#ifdef REAL_ARITHMETIC
-/* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
-   when REAL_ARITHMETIC etc. are not defined.  */
-
-/* Now see if the host and target machines use the same format. 
-   If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
-   reals as doubles because we have no better way in this cross compiler.)
-   This turns off various optimizations that can happen when we know the
-   compiler's float format matches the target's float format.
-   */
-#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
-#define	REAL_IS_NOT_DOUBLE
-#ifndef REAL_VALUE_TYPE
-typedef struct {
-    HOST_WIDE_INT r[sizeof (double)/sizeof (HOST_WIDE_INT)];
-  } realvaluetype;
-#define REAL_VALUE_TYPE realvaluetype
-#endif /* no REAL_VALUE_TYPE */
-#endif /* formats differ */
-#endif /* 0 */
-
-#endif /* emulator not used */
-
-/* If we are not cross-compiling, use a `double' to represent the
-   floating-point value.  Otherwise, use some other type
-   (probably a struct containing an array of longs).  */
-#ifndef REAL_VALUE_TYPE
-#define REAL_VALUE_TYPE double
-#else
-#define REAL_IS_NOT_DOUBLE
-#endif
+/* Determine whether a floating-point value X is infinite.  */
+extern bool real_isinf (const REAL_VALUE_TYPE *);
 
-#if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
+/* Determine whether a floating-point value X is a NaN.  */
+extern bool real_isnan (const REAL_VALUE_TYPE *);
 
-/* Convert a type `double' value in host format first to a type `float'
-   value in host format and then to a single type `long' value which
-   is the bitwise equivalent of the `float' value.  */
-#ifndef REAL_VALUE_TO_TARGET_SINGLE
-#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT)				\
-do { float f = (float) (IN);						\
-     (OUT) = *(long *) &f;						\
-   } while (0)
-#endif
+/* Determine whether a floating-point value X is finite.  */
+extern bool real_isfinite (const REAL_VALUE_TYPE *);
 
-/* Convert a type `double' value in host format to a pair of type `long'
-   values which is its bitwise equivalent, but put the two words into
-   proper word order for the target.  */
-#ifndef REAL_VALUE_TO_TARGET_DOUBLE
-#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT)				\
-do { REAL_VALUE_TYPE in = (IN);  /* Make sure it's not in a register.  */\
-     if (HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN)		\
-       {								\
-	 (OUT)[0] = ((long *) &in)[0];					\
-	 (OUT)[1] = ((long *) &in)[1];					\
-       }								\
-     else								\
-       {								\
-	 (OUT)[1] = ((long *) &in)[0];					\
-	 (OUT)[0] = ((long *) &in)[1];					\
-       }								\
-   } while (0)
-#endif
-#endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
+/* Determine whether a floating-point value X is negative.  */
+extern bool real_isneg (const REAL_VALUE_TYPE *);
 
-/* In this configuration, double and long double are the same. */
-#ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
-#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
-#endif
+/* 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.
-   This is not the same as comparing for equality on IEEE hosts:
-   -0.0 equals 0.0 but they are not identical, and conversely
-   two NaNs might be identical but they cannot be equal.  */
-#define REAL_VALUES_IDENTICAL(x, y) \
-  (!bcmp ((char *) &(x), (char *) &(y), sizeof (REAL_VALUE_TYPE)))
+/* Compare two floating-point objects for bitwise identity.  */
+extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 
-/* Compare two floating-point values for equality.  */
-#ifndef REAL_VALUES_EQUAL
-#define REAL_VALUES_EQUAL(x, y) ((x) == (y))
-#endif
+/* Extend or truncate to a new mode.  */
+extern void real_convert (REAL_VALUE_TYPE *, enum machine_mode,
+			  const REAL_VALUE_TYPE *);
 
-/* Compare two floating-point values for less than.  */
-#ifndef REAL_VALUES_LESS
-#define REAL_VALUES_LESS(x, y) ((x) < (y))
-#endif
+/* Return true if truncating to NEW is exact.  */
+extern bool exact_real_truncate (enum machine_mode, const REAL_VALUE_TYPE *);
 
-/* Truncate toward zero to an integer floating-point value.  */
-#ifndef REAL_VALUE_RNDZINT
-#define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
-#endif
+/* Render R as a decimal floating point constant.  */
+extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t,
+			     size_t, int);
 
-/* Truncate toward zero to an unsigned integer floating-point value.  */
-#ifndef REAL_VALUE_UNSIGNED_RNDZINT
-#define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
-#endif
+/* Render R as a hexadecimal floating point constant.  */
+extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *,
+				 size_t, size_t, int);
 
-/* Convert a floating-point value to integer, rounding toward zero.  */
-#ifndef REAL_VALUE_FIX
-#define REAL_VALUE_FIX(x) ((int) (x))
-#endif
+/* 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 *);
 
-/* Convert a floating-point value to unsigned integer, rounding
-   toward zero. */
-#ifndef REAL_VALUE_UNSIGNED_FIX
-#define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
-#endif
+/* 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);
 
-/* Scale X by Y powers of 2.  */
-#ifndef REAL_VALUE_LDEXP
-#define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
-extern double ldexp ();
-#endif
+/* 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);
 
-/* Convert the string X to a floating-point value.  */
-#ifndef REAL_VALUE_ATOF
-#if 1
-/* Use real.c to convert decimal numbers to binary, ... */
-REAL_VALUE_TYPE ereal_atof ();
-#define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
-#else
-/* ... or, if you like the host computer's atof, go ahead and use it: */
-#define REAL_VALUE_ATOF(x, s) atof (x)
-#if defined (MIPSEL) || defined (MIPSEB)
-/* MIPS compiler can't handle parens around the function name.
-   This problem *does not* appear to be connected with any
-   macro definition for atof.  It does not seem there is one.  */
-extern double atof ();
-#else
-extern double (atof) ();
-#endif
-#endif
-#endif
+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);
 
-/* Negate the floating-point value X.  */
-#ifndef REAL_VALUE_NEGATE
-#define REAL_VALUE_NEGATE(x) (- (x))
-#endif
+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);
 
-/* Truncate the floating-point value X to mode MODE.  This is correct only
-   for the most common case where the host and target have objects of the same
-   size and where `float' is SFmode.  */
+extern void real_inf (REAL_VALUE_TYPE *);
 
-/* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate.  */
-extern REAL_VALUE_TYPE real_value_truncate PROTO((enum machine_mode, REAL_VALUE_TYPE));
+extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, enum machine_mode);
 
-#ifndef REAL_VALUE_TRUNCATE
-#define REAL_VALUE_TRUNCATE(mode, x) \
- (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR	\
-  ? (float) (x) : (x))
-#endif
+extern void real_maxval (REAL_VALUE_TYPE *, int, enum machine_mode);
 
-/* Determine whether a floating-point value X is infinite. */
-#ifndef REAL_VALUE_ISINF
-#define REAL_VALUE_ISINF(x) (target_isinf (x))
-#endif
+extern void real_2expN (REAL_VALUE_TYPE *, int, enum machine_mode);
 
-/* Determine whether a floating-point value X is a NaN. */
-#ifndef REAL_VALUE_ISNAN
-#define REAL_VALUE_ISNAN(x) (target_isnan (x))
-#endif
+extern unsigned int real_hash (const REAL_VALUE_TYPE *);
 
-/* Determine whether a floating-point value X is negative. */
-#ifndef REAL_VALUE_NEGATIVE
-#define REAL_VALUE_NEGATIVE(x) (target_negative (x))
-#endif
 
-extern int target_isnan			PROTO ((REAL_VALUE_TYPE));
-extern int target_isinf			PROTO ((REAL_VALUE_TYPE));
-extern int target_negative		PROTO ((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;
+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;
 
-/* Determine whether a floating-point value X is minus 0. */
-#ifndef REAL_VALUE_MINUS_ZERO
-#define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
-#endif
+
+/* ====================================================================== */
+/* 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 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);
+
+#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 **** */
 
-/* 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 dconstsqrt2;
+extern REAL_VALUE_TYPE dconste;
 
-/* Union type used for extracting real values from CONST_DOUBLEs
-   or putting them in.  */
-
-union real_extract 
-{
-  REAL_VALUE_TYPE d;
-  HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)];
-};
-
-/* For a CONST_DOUBLE:
-   The usual two ints that hold the value.
-   For a DImode, that is all there are;
-    and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
-   For a float, the number of ints varies,
-    and CONST_DOUBLE_LOW is the one that should come first *in memory*.
-    So use &CONST_DOUBLE_LOW(r) as the address of an array of ints.  */
-#define CONST_DOUBLE_LOW(r) XWINT (r, 2)
-#define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
-
-/* Link for chain of all CONST_DOUBLEs in use in current function.  */
-#define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
-/* The MEM which represents this CONST_DOUBLE's value in memory,
-   or const0_rtx if no MEM has been made for it yet,
-   or cc0_rtx if it is not on the chain.  */
-#define CONST_DOUBLE_MEM(r) XEXP (r, 0)
-
-/* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */
 /* Function to return a real value (not a tree node)
    from a given integer constant.  */
-union tree_node;
-REAL_VALUE_TYPE real_value_from_int_cst	PROTO ((union tree_node *,
-						union tree_node *));
+REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree);
 
-#define REAL_VALUE_FROM_CONST_DOUBLE(to, from)		\
-do { union real_extract u;				\
-     bcopy ((char *) &CONST_DOUBLE_LOW ((from)), (char *) &u, sizeof u); \
-     to = u.d; } while (0)
+/* 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) immed_real_const_1 (r,  m)
-extern struct rtx_def *immed_real_const_1	PROTO((REAL_VALUE_TYPE,
-						       enum machine_mode));
-
-
-/* Convert a floating point value `r', that can be interpreted
-   as a host machine float or double, to a decimal ASCII string `s'
-   using printf format string `fmt'.  */
-#ifndef REAL_VALUE_TO_DECIMAL
-#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
-#endif
+#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 int exact_real_inverse PROTO((enum machine_mode, REAL_VALUE_TYPE *));
-
-extern void debug_real			PROTO ((REAL_VALUE_TYPE));
-
-/* In varasm.c */
-extern void assemble_real		PROTO ((REAL_VALUE_TYPE,
-						enum machine_mode));
-#endif /* Not REAL_H_INCLUDED */
+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 (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 *);
+
+/* 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);
+
+/* 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 */