X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Freal.h;h=31fa56140a9de10c53f0d863290ad3c97b71c1fc;hb=aa870c1bd9a934cad1315b215c0bbcaf7858b6f5;hp=3e691ff436ac825ff27bd40fdd46e7c63bb40d29;hpb=b088f6825dae039ade6c891b0a3f275a082dfdac;p=pf3gnuchains%2Fgcc-fork.git

diff --git a/gcc/real.h b/gcc/real.h
index 3e691ff436a..31fa56140a9 100644
--- a/gcc/real.h
+++ b/gcc/real.h
@@ -1,29 +1,162 @@
-/* Front-end tree definitions for GNU compiler.
-   Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+/* Definitions of floating-point access for GNU compiler.
+   Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998,
+   1999, 2000, 2002 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 2, 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, 675 Mass Ave, Cambridge, MA 02139, 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 REAL_H_INCLUDED
-#define REAL_H_INCLUDED
+#ifndef GCC_REAL_H
+#define GCC_REAL_H
+
+#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.
+
+   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.  */
+
+#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.  */
+#define REAL_VALUE_TYPE struct realvaluetype
+
+/* 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
+      #error "REAL_WIDTH > 5 not supported"
+#    endif
+#   endif
+#  endif
+# endif
+#endif
+
+/* Declare functions in real.c.  */
+
+/* Initialize the emulator.  */
+extern void init_real_once	PARAMS ((void));
+
+/* 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 *));
+
+/* 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,
+					 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));
+
+extern long real_to_target	PARAMS ((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_inf		PARAMS ((REAL_VALUE_TYPE *));
+
+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.  */
 
@@ -31,116 +164,89 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #define	TARGET_FLOAT_FORMAT	IEEE_FLOAT_FORMAT
 #endif
 
-#ifndef HOST_FLOAT_FORMAT
-#define	HOST_FLOAT_FORMAT	IEEE_FLOAT_FORMAT
-#endif
+#define REAL_ARITHMETIC(value, code, d1, d2) \
+  real_arithmetic (&(value), code, &(d1), &(d2))
 
-#if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
-#define REAL_INFINITY
-#endif
+#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))
 
-#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
-#define REAL_VALUE_TYPE \
-  struct real_value { long i[sizeof (double) / sizeof (long)]; }
-#endif /* no REAL_VALUE_TYPE */
-#endif /* formats differ */
-#endif /* 0 */
-
-/* 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.  */
+#define REAL_VALUE_ISINF(x)		real_isinf (&(x))
 
-/* Compare two floating-point values for equality.  */
-#ifndef REAL_VALUES_EQUAL
-#define REAL_VALUES_EQUAL(x,y) ((x) == (y))
-#endif
+/* Determine whether a floating-point value X is a NaN.  */
+#define REAL_VALUE_ISNAN(x)		real_isnan (&(x))
 
-/* Compare two floating-point values for less than.  */
-#ifndef REAL_VALUES_LESS
-#define REAL_VALUES_LESS(x,y) ((x) < (y))
-#endif
+/* Determine whether a floating-point value X is negative.  */
+#define REAL_VALUE_NEGATIVE(x)		real_isneg (&(x))
 
-/* Convert a floating-point value to integer by truncating.  */
-#ifndef REAL_VALUE_FIX_TRUNCATE
-#define REAL_VALUE_FIX_TRUNCATE(x) ((int) (x))
-#endif
+/* Determine whether a floating-point value X is minus zero.  */
+#define REAL_VALUE_MINUS_ZERO(x)	real_isnegzero (&(x))
 
-/* Convert a floating-point value to unsigned integer by truncating.  */
-#ifndef REAL_VALUE_UNSIGNED_FIX_TRUNCATE
-#define REAL_VALUE_UNSIGNED_FIX_TRUNCATE(x) ((unsigned int) (x))
-#endif
+/* 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))
 
-/* Convert a floating-point value to integer, using any rounding mode.  */
-#ifndef REAL_VALUE_FIX
-#define REAL_VALUE_FIX(x) ((int) (x))
-#endif
+#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
+  real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0))
 
-/* Convert a floating-point value to unsigned integer, using any rounding
-   mode.  */
-#ifndef REAL_VALUE_UNSIGNED_FIX
-#define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
-#endif
+/* 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)))
 
-/* Scale X by Y powers of 2.  */
-#ifndef REAL_VALUE_LDEXP
-#define REAL_VALUE_LDEXP(x,y) ldexp (x, y)
-extern double ldexp ();
-#endif
+#define REAL_VALUE_TO_DECIMAL(r, s, dig) \
+  real_to_decimal (s, &(r), dig)
 
-/* Convert the string X to a floating-point value.  */
-#ifndef REAL_VALUE_ATOF
-#define REAL_VALUE_ATOF(x) 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
+#define REAL_VALUE_FROM_INT(r, lo, hi, mode) \
+  real_from_integer (&(r), mode, lo, hi, 0)
 
-/* Negate the floating-point value X.  */
-#ifndef REAL_VALUE_NEGATE
-#define REAL_VALUE_NEGATE(x) (- (x))
-#endif
+#define REAL_VALUE_FROM_UNSIGNED_INT(r, lo, hi, mode) \
+  real_from_integer (&(r), mode, lo, hi, 1)
 
-/* 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 REAL_VALUE_TYPE real_value_truncate PARAMS ((enum machine_mode,
+						    REAL_VALUE_TYPE));
 
-#ifndef REAL_VALUE_TRUNCATE
-#define REAL_VALUE_TRUNCATE(mode, x) \
- (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR	\
-  ? (float) (x) : (x))
-#endif
+#define REAL_VALUE_TO_INT(plow, phigh, r) \
+  real_to_integer2 (plow, phigh, &(r))
 
-/* Determine whether a floating-point value X is infinite. */
-#ifndef REAL_VALUE_ISINF
-#define REAL_VALUE_ISINF(x) (target_isinf (x))
-#endif
+extern REAL_VALUE_TYPE real_arithmetic2 PARAMS ((int, const REAL_VALUE_TYPE *,
+						 const REAL_VALUE_TYPE *));
 
-/* Determine whether a floating-point value X is minus 0. */
-#ifndef REAL_VALUE_MINUS_ZERO
-#define REAL_VALUE_MINUS_ZERO(x) (target_minus_zero (x))
-#endif
+#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 PARAMS ((enum machine_mode));
+
+extern REAL_VALUE_TYPE real_from_string2 PARAMS ((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	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 **** */
 
 /* Constant real values 0, 1, 2, and -1.  */
 
@@ -149,45 +255,26 @@ extern REAL_VALUE_TYPE dconst1;
 extern REAL_VALUE_TYPE dconst2;
 extern REAL_VALUE_TYPE dconstm1;
 
-/* Union type used for extracting real values from CONST_DOUBLEs
-   or putting them in.  */
-
-union real_extract 
-{
-  REAL_VALUE_TYPE d;
-  int i[sizeof (REAL_VALUE_TYPE) / sizeof (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) XINT (r, 2)
-#define CONST_DOUBLE_HIGH(r) XINT (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)
-
 /* Function to return a real value (not a tree node)
    from a given integer constant.  */
-REAL_VALUE_TYPE real_value_from_int_cst ();
+REAL_VALUE_TYPE real_value_from_int_cst	PARAMS ((union tree_node *,
+						 union tree_node *));
 
 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */
-
-#define REAL_VALUE_FROM_CONST_DOUBLE(to, from)		\
-do { union real_extract u;				\
-     bcopy (&CONST_DOUBLE_LOW ((from)), &u, sizeof u);	\
-     to = u.d; } while (0)
+#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));
+
+/* 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 *));
+
+/* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node.  */
+extern tree build_real			PARAMS ((tree, REAL_VALUE_TYPE));
 
-#define CONST_DOUBLE_FROM_REAL_VALUE(r,m) immed_real_const_1 (r, m)
 
-#endif /* Not REAL_H_INCLUDED */
+#endif /* ! GCC_REAL_H */