/* 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 Free Software Foundation, Inc.
This file is part of GCC.
#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 - 5)
+#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(())
+{
+ ENUM_BITFIELD (real_value_class) class : 2;
+ unsigned int sign : 1;
+ unsigned int signalling : 1;
+ unsigned int canonical : 1;
+ signed int exp : EXP_BITS;
+ unsigned long sig[SIGSZ];
+};
+
+/* 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
-#define REAL_VALUE_TYPE_SIZE (128 + 32)
+/* 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 (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) PARAMS ((const struct real_format *, long *,
+ const REAL_VALUE_TYPE *));
+ void (*decode) PARAMS ((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, or -1 for a complex encoding. */
+ int signbit;
+
+ /* 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 floating point mode.
+ Indexed by MODE - QFmode. */
+extern const struct real_format *real_format_for_mode[TFmode - QFmode + 1];
+
+
+/* Declare functions in real.c. */
/* Binary or unary arithmetic on tree_code. */
extern void real_arithmetic PARAMS ((REAL_VALUE_TYPE *, int,
/* Render R as a decimal floating point constant. */
extern void real_to_decimal PARAMS ((char *, const REAL_VALUE_TYPE *,
- int));
+ 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));
+ size_t, size_t, int));
/* Render R as an integer. */
extern HOST_WIDE_INT real_to_integer PARAMS ((const REAL_VALUE_TYPE *));
unsigned HOST_WIDE_INT,
HOST_WIDE_INT, int));
+extern long real_to_target_fmt PARAMS ((long *, const REAL_VALUE_TYPE *,
+ const struct real_format *));
extern long real_to_target PARAMS ((long *, const REAL_VALUE_TYPE *,
enum machine_mode));
+extern void real_from_target_fmt PARAMS ((REAL_VALUE_TYPE *, const long *,
+ const struct real_format *));
extern void real_from_target PARAMS ((REAL_VALUE_TYPE *, const long *,
enum machine_mode));
extern bool real_nan PARAMS ((REAL_VALUE_TYPE *, const char *,
int, enum machine_mode));
+extern void real_maxval PARAMS ((REAL_VALUE_TYPE *, int,
+ enum machine_mode));
+
extern void real_2expN PARAMS ((REAL_VALUE_TYPE *, int));
+extern unsigned int real_hash PARAMS ((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;
+
+
/* ====================================================================== */
/* Crap. */
#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)
/* **** End of software floating point emulator interface macros **** */
\f
-/* Constant real values 0, 1, 2, and -1. */
+/* Constant real values 0, 1, 2, -1, -2 and 0.5. */
extern REAL_VALUE_TYPE dconst0;
extern REAL_VALUE_TYPE dconst1;
extern REAL_VALUE_TYPE dconst2;
extern REAL_VALUE_TYPE dconstm1;
+extern REAL_VALUE_TYPE dconstm2;
+extern REAL_VALUE_TYPE dconsthalf;
/* Function to return a real value (not a tree node)
from a given integer constant. */
/* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */
extern tree build_real PARAMS ((tree, REAL_VALUE_TYPE));
+/* Calculate R as the square root of X in the given machine mode. */
+extern bool real_sqrt PARAMS ((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 PARAMS ((REAL_VALUE_TYPE *,
+ enum machine_mode,
+ const REAL_VALUE_TYPE *,
+ HOST_WIDE_INT));
#endif /* ! GCC_REAL_H */
git://gcc.gnu.org / gcc.git / blobdiff