-/* 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. */
#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 **** */
\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)
-
/* 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 */
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