+/* 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)])
+
+#define FLOAT_MODE_FORMAT(MODE) \
+ (REAL_MODE_FORMAT (SCALAR_FLOAT_MODE_P (MODE)? (MODE) \
+ : GET_MODE_INNER (MODE)))
+
+/* 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 MODE_COMPOSITE_P(MODE) \
+ (FLOAT_MODE_P (MODE) \
+ && FLOAT_MODE_FORMAT (MODE)->pnan < FLOAT_MODE_FORMAT (MODE)->p)
+
+/* Accessor macros for format properties. */
+#define MODE_HAS_NANS(MODE) \
+ (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_nans)
+#define MODE_HAS_INFINITIES(MODE) \
+ (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_inf)
+#define MODE_HAS_SIGNED_ZEROS(MODE) \
+ (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_signed_zero)
+#define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE) \
+ (FLOAT_MODE_P (MODE) \
+ && FLOAT_MODE_FORMAT (MODE)->has_sign_dependent_rounding)
+
+
+/* Declare functions in real.c. */
+
+/* Binary or unary arithmetic on tree_code. */
+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 (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
+
+/* Determine whether a floating-point value X is infinite. */
+extern bool real_isinf (const REAL_VALUE_TYPE *);
+
+/* Determine whether a floating-point value X is a NaN. */
+extern bool real_isnan (const REAL_VALUE_TYPE *);
+
+/* Determine whether a floating-point value X is finite. */
+extern bool real_isfinite (const REAL_VALUE_TYPE *);
+
+/* Determine whether a floating-point value X is negative. */
+extern bool real_isneg (const REAL_VALUE_TYPE *);
+
+/* Determine whether a floating-point value X is minus zero. */
+extern bool real_isnegzero (const REAL_VALUE_TYPE *);
+
+/* Compare two floating-point objects for bitwise identity. */
+extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
+
+/* Extend or truncate to a new mode. */
+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 (enum machine_mode, const REAL_VALUE_TYPE *);
+
+/* Render R as a decimal floating point constant. */
+extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t,
+ size_t, int);
+
+/* Render R as a decimal floating point constant, rounded so as to be
+ parsed back to the same value when interpreted in mode MODE. */
+extern void real_to_decimal_for_mode (char *, const REAL_VALUE_TYPE *, size_t,
+ size_t, int, enum machine_mode);
+
+/* Render R as a hexadecimal floating point constant. */
+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 (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. Return -1 if
+ the value underflows, +1 if overflows, and 0 otherwise. */
+extern int 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 (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, enum machine_mode);
+
+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 motorola_single_format;
+extern const struct real_format spu_single_format;
+extern const struct real_format ieee_double_format;
+extern const struct real_format mips_double_format;
+extern const struct real_format motorola_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 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 const struct real_format ieee_half_format;
+extern const struct real_format arm_half_format;
+
+
+/* ====================================================================== */
+/* Crap. */