/* Definitions of floating-point access for GNU compiler.
- Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998,
- 1999, 2000, 2002 Free Software Foundation, Inc.
+ Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998, 1999,
+ 2000, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of GCC.
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. */
+ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301, USA. */
#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.
+/* An expanded form of the represented number. */
- 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. */
+/* Enumerate the special cases of numbers that we encounter. */
+enum real_value_class {
+ rvc_zero,
+ rvc_normal,
+ rvc_inf,
+ rvc_nan
+};
+
+#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))
+
+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];
+};
+
+#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)))
+
+/* 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
+
+/* 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. */
-#define REAL_VALUE_TYPE_SIZE (128 + 32)
+#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 */
-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
+/* Verify the guess. */
+extern char test_real_width
+ [sizeof(REAL_VALUE_TYPE) <= REAL_WIDTH*sizeof(HOST_WIDE_INT) ? 1 : -1];
/* 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
# if REAL_WIDTH == 5
# define CONST_DOUBLE_FORMAT "wwwww"
# else
- #error "REAL_WIDTH > 5 not supported"
+# if REAL_WIDTH == 6
+# define CONST_DOUBLE_FORMAT "wwwwww"
+# else
+ #error "REAL_WIDTH > 6 not supported"
+# endif
# endif
# endif
# endif
# endif
#endif
-/* Declare functions in real.c. */
-/* Initialize the emulator. */
-extern void init_real_once PARAMS ((void));
+/* 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;
+
+ /* log2(b). */
+ int log2_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;
+};
+
+
+/* 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];
+
+#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)])
+
+/* 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)
+
+/* Declare functions in real.c. */
/* Binary or unary arithmetic on tree_code. */
-extern void real_arithmetic PARAMS ((REAL_VALUE_TYPE *, int,
- const REAL_VALUE_TYPE *,
- const REAL_VALUE_TYPE *));
+extern bool real_arithmetic (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 *));
+extern bool real_compare (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 *));
+extern bool real_isinf (const REAL_VALUE_TYPE *);
/* Determine whether a floating-point value X is a NaN. */
-extern bool real_isnan PARAMS ((const REAL_VALUE_TYPE *));
+extern bool real_isnan (const REAL_VALUE_TYPE *);
/* Determine whether a floating-point value X is negative. */
-extern bool real_isneg PARAMS ((const REAL_VALUE_TYPE *));
+extern bool real_isneg (const REAL_VALUE_TYPE *);
/* Determine whether a floating-point value X is minus zero. */
-extern bool real_isnegzero PARAMS ((const REAL_VALUE_TYPE *));
+extern bool real_isnegzero (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 *));
+extern bool real_identical (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 *));
+extern void real_convert (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 *));
+extern bool exact_real_truncate (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));
+extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t,
+ size_t, int);
/* Render R as a hexadecimal floating point constant. */
-extern void real_to_hexadecimal PARAMS ((char *, const REAL_VALUE_TYPE *,
- int));
+extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *,
+ size_t, size_t, 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 *));
+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 *);
/* Initialize R from a decimal or hexadecimal string. */
-extern void real_from_string PARAMS ((REAL_VALUE_TYPE *, const char *));
+extern void 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);
/* 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_integer (REAL_VALUE_TYPE *, enum machine_mode,
+ unsigned HOST_WIDE_INT, HOST_WIDE_INT, int);
+
+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);
+
+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);
+
+extern void real_inf (REAL_VALUE_TYPE *);
+
+extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, enum machine_mode);
+
+extern void real_maxval (REAL_VALUE_TYPE *, int, enum machine_mode);
+
+extern void real_2expN (REAL_VALUE_TYPE *, int);
+
+extern unsigned int real_hash (const 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 ieee_double_format;
+extern const struct real_format mips_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 i370_single_format;
+extern const struct real_format i370_double_format;
+extern const struct real_format c4x_single_format;
+extern const struct real_format c4x_extended_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;
-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. */
-
-#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_VALUE_TO_TARGET_SINGLE(IN, OUT) \
((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0)))
-#define REAL_VALUE_TO_DECIMAL(r, s, dig) \
- real_to_decimal (s, &(r), dig)
-
#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)
-extern REAL_VALUE_TYPE real_value_truncate PARAMS ((enum machine_mode,
- REAL_VALUE_TYPE));
+/* 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 PARAMS ((int, const REAL_VALUE_TYPE *,
- const REAL_VALUE_TYPE *));
+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 PARAMS ((enum machine_mode));
+extern int significand_size (enum machine_mode);
-extern REAL_VALUE_TYPE real_from_string2 PARAMS ((const char *,
- 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)
/* ??? These were added for Paranoia support. */
/* Return floor log2(R). */
-extern int real_exponent PARAMS ((const REAL_VALUE_TYPE *));
+extern int real_exponent (const REAL_VALUE_TYPE *);
/* R = A * 2**EXP. */
-extern void real_ldexp PARAMS ((REAL_VALUE_TYPE *,
- const REAL_VALUE_TYPE *, int));
+extern void real_ldexp (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. */
+/* 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 dconstpi;
+extern REAL_VALUE_TYPE dconste;
/* Function to return a real value (not a tree node)
from a given integer constant. */
-REAL_VALUE_TYPE real_value_from_int_cst PARAMS ((union tree_node *,
- union tree_node *));
+REAL_VALUE_TYPE real_value_from_int_cst (tree, tree);
/* 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))
+ ((to) = *CONST_DOUBLE_REAL_VALUE (from))
/* 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));
+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 bool exact_real_inverse PARAMS ((enum machine_mode, REAL_VALUE_TYPE *));
+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 PARAMS ((tree, REAL_VALUE_TYPE));
-
+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 *);
#endif /* ! GCC_REAL_H */
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