gcc/

	* real.c, real.h: Rewrite from scratch.

	* Makefile.in (simplify-rtx.o): Depend on TREE_H.
	(paranoia): New target.
	* builtins.c (fold_builtin_inf): Use new real.h interface.
	* c-common.c (builtin_define_with_hex_fp_value): Likewise.
	* c-lex.c (interpret_float): Likewise.
	* emit-rtl.c (gen_lowpart_common): Likewise.
	* optabs.c (expand_float): Use real_2expN.
	* config/ia64/ia64.md (divsi3, udivsi3): Likewise.
	* defaults.h (INTEL_EXTENDED_IEEE_FORMAT): New.
	(FLOAT_WORDS_BIG_ENDIAN): New.
	* cse.c (find_comparison_args): Don't pass FLOAT_STORE_FLAG_VALUE
	directly to REAL_VALUE_NEGATIVE.
	* loop.c (canonicalize_condition): Likewise.
	* simplify-rtx.c: Include tree.h.
	(simplify_unary_operation): Don't handle FIX and UNSIGNED_FIX
	with floating-point result modes.
	* toplev.c (backend_init): Call init_real_once.

	* fold-const.c (force_fit_type): Don't call CHECK_FLOAT_VALUE.
	* tree.c (build_real): Likewise.
	* config/alpha/alpha.c, config/vax/vax.c (float_strings,
	float_values, inited_float_values, check_float_value): Remove.
	* config/alpha/alpha.h, config/m68hc11/m68hc11.h,
	config/m88k/m88k.h, config/vax/vax.h (CHECK_FLOAT_VALUE): Remove.
	* doc/tm.texi (CHECK_FLOAT_VALUE): Remove.

gcc/f/
	* target.c (ffetarget_real1): Don't pass FFETARGET_ATOF_
	directly to ffetarget_make_real1.
	(ffetarget_real2): Similarly.
	* target.h (ffetarget_cvt_r1_to_rv_, ffetarget_cvt_rv_to_r2_,
	ffetarget_cvt_r2_to_rv_): Use new real.h interface and simplify.

gcc/java/
	* jcf-parse.c (get_constant): Runtime check for IEEE format;
	use new real.h interface.
	* jcf-write.c (find_constant_index): Use new real.h interface.
	* lex.c (IS_ZERO): Use REAL_VALUES_EQUAL.

contrib/
	* paranoia.cc: New file.


git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@57198 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 171 insertions, 192 deletions

diff --git a/gcc/real.h b/gcc/real.h
index f4265826ce9..31fa56140a9 100644
--- a/gcc/real.h
+++ b/gcc/real.h
@@ -2,96 +2,44 @@
    Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998,
    1999, 2000, 2002 Free Software Foundation, Inc.
 
-This file is part of GCC.
+   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
-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 2, 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.
+   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 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 COPYING.  If not, write to the Free
+   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
 
 #ifndef GCC_REAL_H
 #define GCC_REAL_H
 
 #include "machmode.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
-
-/* Default to IEEE float if not specified.  Nearly all machines use it.  */
-
-#ifndef TARGET_FLOAT_FORMAT
-#define	TARGET_FLOAT_FORMAT	IEEE_FLOAT_FORMAT
-#endif
-
-#ifndef HOST_FLOAT_FORMAT
-#define	HOST_FLOAT_FORMAT	IEEE_FLOAT_FORMAT
-#endif
-
-#ifndef INTEL_EXTENDED_IEEE_FORMAT
-#define INTEL_EXTENDED_IEEE_FORMAT 0
-#endif
-
-/* 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.  */
-
-/* This is defined 0 or 1, like WORDS_BIG_ENDIAN.  */
-#ifndef FLOAT_WORDS_BIG_ENDIAN
-#define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
-#endif
-
-/* 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
-
-#ifndef LONG_DOUBLE_TYPE_SIZE
-#define LONG_DOUBLE_TYPE_SIZE 64
-#endif
-/* MAX_LONG_DOUBLE_TYPE_SIZE is a constant tested by #if.
-   LONG_DOUBLE_TYPE_SIZE can vary at compiler run time.
-   So long as macros like REAL_VALUE_TO_TARGET_LONG_DOUBLE cannot
-   vary too, however, then XFmode and TFmode long double
-   cannot both be supported at the same time.  */
-#ifndef MAX_LONG_DOUBLE_TYPE_SIZE
-#define MAX_LONG_DOUBLE_TYPE_SIZE LONG_DOUBLE_TYPE_SIZE
-#endif
+/* 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.
 
-/* **** Start of software floating point emulator interface macros **** */
+   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.  */
 
-/* REAL_VALUE_TYPE is an array of the minimum number of HOST_WIDE_INTs
-   required to hold either a 96- or 160-bit extended precision floating
-   point type.  This is true even if the maximum precision floating
-   point type on the target is smaller.  */
-#if MAX_LONG_DOUBLE_TYPE_SIZE == 128 && !INTEL_EXTENDED_IEEE_FORMAT
-#define REAL_VALUE_TYPE_SIZE 160
-#else
-#define REAL_VALUE_TYPE_SIZE 96
-#endif
+#define REAL_VALUE_TYPE_SIZE (128 + 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.  */
@@ -99,7 +47,7 @@ struct realvaluetype GTY(()) {
 
 /* 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 five (32-bit HOST_WIDE_INT, 160-bit REAL_VALUE_TYPE).
+   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.  */
@@ -126,134 +74,177 @@ struct realvaluetype GTY(()) {
 # endif
 #endif
 
-extern unsigned int significand_size	PARAMS ((enum machine_mode));
+/* Declare functions in real.c.  */
 
-#define REAL_ARITHMETIC(value, code, d1, d2) \
-  earith (&(value), (code), &(d1), &(d2))
+/* Initialize the emulator.  */
+extern void init_real_once	PARAMS ((void));
 
-/* Declare functions in real.c.  */
-extern void earith		PARAMS ((REAL_VALUE_TYPE *, int,
-				       REAL_VALUE_TYPE *, REAL_VALUE_TYPE *));
-extern REAL_VALUE_TYPE etrunci	PARAMS ((REAL_VALUE_TYPE));
-extern REAL_VALUE_TYPE etruncui	PARAMS ((REAL_VALUE_TYPE));
-extern REAL_VALUE_TYPE ereal_negate PARAMS ((REAL_VALUE_TYPE));
-extern HOST_WIDE_INT efixi	PARAMS ((REAL_VALUE_TYPE));
-extern unsigned HOST_WIDE_INT efixui PARAMS ((REAL_VALUE_TYPE));
-extern void ereal_from_int	PARAMS ((REAL_VALUE_TYPE *,
-				       HOST_WIDE_INT, HOST_WIDE_INT,
-				       enum machine_mode));
-extern void ereal_from_uint	PARAMS ((REAL_VALUE_TYPE *,
-				       unsigned HOST_WIDE_INT,
-				       unsigned HOST_WIDE_INT,
-				       enum machine_mode));
-extern void ereal_to_int	PARAMS ((HOST_WIDE_INT *, HOST_WIDE_INT *,
-				       REAL_VALUE_TYPE));
-extern REAL_VALUE_TYPE ereal_ldexp PARAMS ((REAL_VALUE_TYPE, int));
-
-extern void etartdouble		PARAMS ((REAL_VALUE_TYPE, long *));
-extern void etarldouble		PARAMS ((REAL_VALUE_TYPE, long *));
-extern void etardouble		PARAMS ((REAL_VALUE_TYPE, long *));
-extern long etarsingle		PARAMS ((REAL_VALUE_TYPE));
-extern void ereal_to_decimal	PARAMS ((REAL_VALUE_TYPE, char *, int));
-extern int ereal_cmp		PARAMS ((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
-extern int ereal_isneg		PARAMS ((REAL_VALUE_TYPE));
-extern REAL_VALUE_TYPE ereal_unto_float PARAMS ((long));
-extern REAL_VALUE_TYPE ereal_unto_double PARAMS ((long *));
-extern REAL_VALUE_TYPE ereal_from_float PARAMS ((HOST_WIDE_INT));
-extern REAL_VALUE_TYPE ereal_from_double PARAMS ((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)
-
-/* 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) \
-  (!memcmp ((char *) &(x), (char *) &(y), sizeof (REAL_VALUE_TYPE)))
-
-/* These return REAL_VALUE_TYPE: */
-#define REAL_VALUE_RNDZINT(x) (etrunci (x))
-#define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
-
-/* Truncate the floating-point value X to mode MODE.  */
-#define REAL_VALUE_TRUNCATE(mode, x)  real_value_truncate (mode, x)
-extern REAL_VALUE_TYPE real_value_truncate PARAMS ((enum machine_mode,
-                                                 REAL_VALUE_TYPE));
+/* Binary or unary arithmetic on tree_code.  */
+extern void real_arithmetic	PARAMS ((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 *));
+
+/* Determine whether a floating-point value X is infinite.  */
+extern bool real_isinf		PARAMS ((const REAL_VALUE_TYPE *));
+
+/* Determine whether a floating-point value X is a NaN.  */
+extern bool real_isnan		PARAMS ((const REAL_VALUE_TYPE *));
+
+/* Determine whether a floating-point value X is negative.  */
+extern bool real_isneg		PARAMS ((const REAL_VALUE_TYPE *));
+
+/* Determine whether a floating-point value X is minus zero.  */
+extern bool real_isnegzero	PARAMS ((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 *));
 
-/* Expansion of REAL_VALUE_TRUNCATE.
-   The result is in floating point, rounded to nearest or even.  */
+/* Extend or truncate to a new mode.  */
+extern void real_convert	PARAMS ((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,
-					 REAL_VALUE_TYPE *));
+					 const REAL_VALUE_TYPE *));
+
+/* Render R as a decimal floating point constant.  */
+extern void real_to_decimal	PARAMS ((char *, const REAL_VALUE_TYPE *,
+					 int));
+
+/* Render R as a hexadecimal floating point constant.  */
+extern void real_to_hexadecimal	PARAMS ((char *, const REAL_VALUE_TYPE *,
+					 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 *));
+
+/* Initialize R from a decimal or hexadecimal string.  */
+extern void real_from_string	PARAMS ((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));
 
-/* 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))
+extern long real_to_target	PARAMS ((long *, const REAL_VALUE_TYPE *,
+					 enum machine_mode));
 
-/* Convert ASCII string S to floating point in mode M.
-   Decimal input uses ATOF.  Hexadecimal uses HTOF.  */
-#define REAL_VALUE_ATOF(s,m) ereal_atof(s,m)
-#define REAL_VALUE_HTOF(s,m) ereal_atof(s,m)
+extern void real_from_target	PARAMS ((REAL_VALUE_TYPE *, const long *,
+					 enum machine_mode));
 
-#define REAL_VALUE_NEGATE ereal_negate
+extern void real_inf		PARAMS ((REAL_VALUE_TYPE *));
 
-/* Compute the absolute value of a floating-point value X.  */
-#define REAL_VALUE_ABS(x) \
-   (REAL_VALUE_NEGATIVE (x) ? REAL_VALUE_NEGATE (x) : (x))
+extern void real_nan		PARAMS ((REAL_VALUE_TYPE *, const char *,
+					 int, enum machine_mode));
+
+extern void real_2expN		PARAMS ((REAL_VALUE_TYPE *, int));
+
+/* ====================================================================== */
+/* Crap.  */
+
+/* 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
+
+/* Default to IEEE float if not specified.  Nearly all machines use it.  */
+
+#ifndef TARGET_FLOAT_FORMAT
+#define	TARGET_FLOAT_FORMAT	IEEE_FLOAT_FORMAT
+#endif
+
+#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) (target_isinf (x))
+#define REAL_VALUE_ISINF(x)		real_isinf (&(x))
 
 /* Determine whether a floating-point value X is a NaN.  */
-#define REAL_VALUE_ISNAN(x) (target_isnan (x))
+#define REAL_VALUE_ISNAN(x)		real_isnan (&(x))
 
 /* Determine whether a floating-point value X is negative.  */
-#define REAL_VALUE_NEGATIVE(x) (target_negative (x))
+#define REAL_VALUE_NEGATIVE(x)		real_isneg (&(x))
 
 /* Determine whether a floating-point value X is minus zero.  */
-#define REAL_VALUE_MINUS_ZERO(x) \
- ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
+#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_INT ereal_to_int
+#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
+  real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0))
 
-/* 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)
+/* 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_UNSIGNED_INT(d, lo, hi, mode) \
-  ereal_from_uint (&d, lo, hi, mode)
+#define REAL_VALUE_TO_DECIMAL(r, s, dig) \
+  real_to_decimal (s, &(r), dig)
 
-/* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
-#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) 		\
-   (LONG_DOUBLE_TYPE_SIZE == 64 ? etardouble ((IN), (OUT))	\
-    : LONG_DOUBLE_TYPE_SIZE == 96 ? etarldouble ((IN), (OUT))	\
-    : LONG_DOUBLE_TYPE_SIZE == 128 ? etartdouble ((IN), (OUT))  \
-    : abort ())
-#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
+#define REAL_VALUE_FROM_INT(r, lo, hi, mode) \
+  real_from_integer (&(r), mode, lo, hi, 0)
 
-/* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
-#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
+#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));
+
+#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 *));
+
+#define REAL_VALUE_NEGATE(X) \
+  real_arithmetic2 (NEGATE_EXPR, &(X), NULL)
 
-/* Inverse of REAL_VALUE_TO_TARGET_DOUBLE.  */
-#define REAL_VALUE_UNTO_TARGET_DOUBLE(d)  (ereal_unto_double (d))
+#define REAL_VALUE_ABS(X) \
+  real_arithmetic2 (ABS_EXPR, &(X), NULL)
 
-/* Inverse of REAL_VALUE_TO_TARGET_SINGLE.  */
-#define REAL_VALUE_UNTO_TARGET_SINGLE(f)  (ereal_unto_float (f))
+extern int significand_size PARAMS ((enum machine_mode));
 
-/* 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))
+extern REAL_VALUE_TYPE real_from_string2 PARAMS ((const char *,
+						  enum machine_mode));
 
-/* f is a HOST_WIDE_INT containing a single precision target float value.  */
-#define REAL_VALUE_FROM_TARGET_SINGLE(f)  (ereal_from_float (f))
+#define REAL_VALUE_ATOF(s, m) \
+  real_from_string2 (s, m)
 
-/* Conversions to decimal ASCII string.  */
-#define REAL_VALUE_TO_DECIMAL(r, s, dig) (ereal_to_decimal (r, s, dig))
+#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	PARAMS ((const REAL_VALUE_TYPE *));
+
+/* R = A * 2**EXP.  */
+extern void real_ldexp		PARAMS ((REAL_VALUE_TYPE *,
+					 const REAL_VALUE_TYPE *, int));
 
 /* **** End of software floating point emulator interface macros **** */
 
@@ -264,35 +255,23 @@ extern REAL_VALUE_TYPE dconst1;
 extern REAL_VALUE_TYPE dconst2;
 extern REAL_VALUE_TYPE dconstm1;
 
-/* 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	PARAMS ((union tree_node *,
-						union tree_node *));
+						 union tree_node *));
 
-#define REAL_VALUE_FROM_CONST_DOUBLE(to, from)		\
+/* 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))
 
 /* 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));
 
-/* Shorthand; can be handy in machine descriptions.  */
-#define CONST_DOUBLE_ATOF(s, m) \
-  CONST_DOUBLE_FROM_REAL_VALUE (REAL_VALUE_ATOF (s, m), m)
-
 /* Replace R by 1/R in the given machine mode, if the result is exact.  */
-extern int exact_real_inverse	PARAMS ((enum machine_mode, REAL_VALUE_TYPE *));
-extern int target_isnan		PARAMS ((REAL_VALUE_TYPE));
-extern int target_isinf		PARAMS ((REAL_VALUE_TYPE));
-extern int target_negative	PARAMS ((REAL_VALUE_TYPE));
-extern void debug_real		PARAMS ((REAL_VALUE_TYPE));
-extern REAL_VALUE_TYPE ereal_atof PARAMS ((const char *, enum machine_mode));
-extern REAL_VALUE_TYPE ereal_inf PARAMS ((enum machine_mode));
+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));