-/* 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. */
+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"
/* 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. */
#define HOST_FLOAT_FORMAT IEEE_FLOAT_FORMAT
#endif
-#if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
-#define REAL_INFINITY
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
+#define INTEL_EXTENDED_IEEE_FORMAT 0
#endif
-#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
-
-/* Compare two floating-point values for equality. */
-#ifndef REAL_VALUES_EQUAL
-#define REAL_VALUES_EQUAL(x,y) ((x) == (y))
-#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. */
-/* Compare two floating-point values for less than. */
-#ifndef REAL_VALUES_LESS
-#define REAL_VALUES_LESS(x,y) ((x) < (y))
+/* This is defined 0 or 1, like WORDS_BIG_ENDIAN. */
+#ifndef FLOAT_WORDS_BIG_ENDIAN
+#define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
#endif
-/* Convert a floating-point value to integer by truncating. */
-#ifndef REAL_VALUE_FIX_TRUNCATE
-#define REAL_VALUE_FIX_TRUNCATE(x) ((int) (x))
+/* 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
-
-/* 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
-/* Convert a floating-point value to integer, using any rounding mode. */
-#ifndef REAL_VALUE_FIX
-#define REAL_VALUE_FIX(x) ((int) (x))
+#ifndef LONG_DOUBLE_TYPE_SIZE
+#define LONG_DOUBLE_TYPE_SIZE 64
#endif
-
-/* 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))
+/* 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
-/* Scale X by Y powers of 2. */
-#ifndef REAL_VALUE_LDEXP
-#define REAL_VALUE_LDEXP(x,y) ldexp (x, y)
-extern double ldexp ();
-#endif
+/* **** Start of software floating point emulator interface macros **** */
-/* 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 ();
+/* 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
-extern double (atof) ();
-#endif
+#define REAL_VALUE_TYPE_SIZE 96
#endif
+#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
-/* Negate the floating-point value X. */
-#ifndef REAL_VALUE_NEGATE
-#define REAL_VALUE_NEGATE(x) (- (x))
-#endif
+/* 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).
-/* 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. */
+ 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. */
-#ifndef REAL_VALUE_TRUNCATE
-#define REAL_VALUE_TRUNCATE(mode, x) \
- (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \
- ? (float) (x) : (x))
+#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
-/* Determine whether a floating-point value X is infinite. */
-#ifndef REAL_VALUE_ISINF
+extern unsigned int significand_size PARAMS ((enum machine_mode));
+
+#define REAL_ARITHMETIC(value, code, d1, d2) \
+ earith (&(value), (code), &(d1), &(d2))
+
+/* 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 *));
+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));
+
+/* Expansion of REAL_VALUE_TRUNCATE.
+ The result is in floating point, rounded to nearest or even. */
+extern bool exact_real_truncate PARAMS ((enum machine_mode,
+ REAL_VALUE_TYPE *));
+
+/* 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))
+
+/* 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)
+
+#define REAL_VALUE_NEGATE ereal_negate
+
+/* Compute the absolute value of a floating-point value X. */
+#define REAL_VALUE_ABS(x) \
+ (REAL_VALUE_NEGATIVE (x) ? REAL_VALUE_NEGATE (x) : (x))
+
+/* Determine whether a floating-point value X is infinite. */
#define REAL_VALUE_ISINF(x) (target_isinf (x))
-#endif
-/* Determine whether a floating-point value X is a NaN. */
-#ifndef REAL_VALUE_ISNAN
+/* Determine whether a floating-point value X is a NaN. */
#define REAL_VALUE_ISNAN(x) (target_isnan (x))
-#endif
-/* 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
+/* Determine whether a floating-point value X is negative. */
+#define REAL_VALUE_NEGATIVE(x) (target_negative (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_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. */
+#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)))
+
+/* 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))
+
+/* Inverse of REAL_VALUE_TO_TARGET_SINGLE. */
+#define REAL_VALUE_UNTO_TARGET_SINGLE(f) (ereal_unto_float (f))
+
+/* 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))
+
+/* f is a HOST_WIDE_INT containing a single precision target float value. */
+#define REAL_VALUE_FROM_TARGET_SINGLE(f) (ereal_from_float (f))
+
+/* Conversions to decimal ASCII string. */
+#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
+
+/* **** End of software floating point emulator interface macros **** */
\f
/* Constant real values 0, 1, 2, and -1. */
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)
-
+/* 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. */
-REAL_VALUE_TYPE real_value_from_int_cst ();
-
-/* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
+union tree_node;
+REAL_VALUE_TYPE real_value_from_int_cst PARAMS ((union tree_node *,
+ union tree_node *));
#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)
+ 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) immed_real_const_1 (r, 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));
+
+/* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */
+extern tree build_real PARAMS ((tree, REAL_VALUE_TYPE));
+
-#endif /* Not REAL_H_INCLUDED */
+#endif /* ! GCC_REAL_H */
OSDN Git Service
