/* Definitions of floating-point access for GNU compiler.
- Copyright (C) 1989-2015 Free Software Foundation, Inc.
+ Copyright (C) 1989-2020 Free Software Foundation, Inc.
This file is part of GCC.
sure they're packed together, otherwise REAL_VALUE_TYPE_SIZE will
be miscomputed. */
unsigned int /* ENUM_BITFIELD (real_value_class) */ cl : 2;
+ /* 1 if number is decimal floating point. */
unsigned int decimal : 1;
+ /* 1 if number is negative. */
unsigned int sign : 1;
+ /* 1 if number is signalling. */
unsigned int signalling : 1;
+ /* 1 if number is canonical
+ All are generally used for handling cases in real.c. */
unsigned int canonical : 1;
+ /* unbiased exponent of the number. */
unsigned int uexp : EXP_BITS;
+ /* significand of the number. */
unsigned long sig[SIGSZ];
};
or -1 for a complex encoding. */
int signbit_rw;
+ /* If this is an IEEE interchange format, the number of bits in the
+ format; otherwise, if it is an IEEE extended format, one more
+ than the greatest number of bits in an interchange format it
+ extends; otherwise 0. Formats need not follow the IEEE 754-2008
+ recommended practice regarding how signaling NaNs are identified,
+ and may vary in the choice of default NaN, but must follow other
+ IEEE practice regarding having NaNs, infinities and subnormal
+ values, and the relation of minimum and maximum exponents, and,
+ for interchange formats, the details of the encoding. */
+ int ieee_bits;
+
/* Default rounding mode for operations on this format. */
bool round_towards_zero;
bool has_sign_dependent_rounding;
(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)])
+ : GET_MODE_CLASS (MODE) == MODE_FLOAT \
+ ? ((MODE) - MIN_MODE_FLOAT) \
+ : (gcc_unreachable (), 0)])
#define FLOAT_MODE_FORMAT(MODE) \
- (REAL_MODE_FORMAT (SCALAR_FLOAT_MODE_P (MODE)? (MODE) \
- : GET_MODE_INNER (MODE)))
+ (REAL_MODE_FORMAT (as_a <scalar_float_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
(FLOAT_MODE_P (MODE) \
&& FLOAT_MODE_FORMAT (MODE)->has_sign_dependent_rounding)
+/* This class allows functions in this file to accept a floating-point
+ format as either a mode or an explicit real_format pointer. In the
+ former case the mode must be VOIDmode (which means "no particular
+ format") or must satisfy SCALAR_FLOAT_MODE_P. */
+class format_helper
+{
+public:
+ format_helper (const real_format *format) : m_format (format) {}
+ template<typename T> format_helper (const T &);
+ const real_format *operator-> () const { return m_format; }
+ operator const real_format *() const { return m_format; }
+
+ bool decimal_p () const { return m_format && m_format->b == 10; }
+ bool can_represent_integral_type_p (tree type) const;
+
+private:
+ const real_format *m_format;
+};
+
+template<typename T>
+inline format_helper::format_helper (const T &m)
+ : m_format (m == VOIDmode ? 0 : REAL_MODE_FORMAT (m))
+{}
+
/* Declare functions in real.c. */
/* True if the given mode has a NaN representation and the treatment of
/* 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 a signaling NaN. */
+extern bool real_issignaling_nan (const REAL_VALUE_TYPE *);
+
/* Determine whether a floating-point value X is finite. */
extern bool real_isfinite (const REAL_VALUE_TYPE *);
extern bool real_equal (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
extern bool real_less (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
-/* Extend or truncate to a new mode. */
-extern void real_convert (REAL_VALUE_TYPE *, machine_mode,
+/* Extend or truncate to a new format. */
+extern void real_convert (REAL_VALUE_TYPE *, format_helper,
const REAL_VALUE_TYPE *);
/* Return true if truncating to NEW is exact. */
-extern bool exact_real_truncate (machine_mode, const REAL_VALUE_TYPE *);
+extern bool exact_real_truncate (format_helper, const REAL_VALUE_TYPE *);
/* Render R as a decimal floating point constant. */
extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t,
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 *, machine_mode);
+extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, format_helper);
-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 *, machine_mode);
+extern long real_to_target (long *, const REAL_VALUE_TYPE *, format_helper);
-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 *,
- machine_mode);
+ format_helper);
extern void real_inf (REAL_VALUE_TYPE *);
-extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, machine_mode);
+extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, format_helper);
extern void real_maxval (REAL_VALUE_TYPE *, int, machine_mode);
-extern void real_2expN (REAL_VALUE_TYPE *, int, machine_mode);
+extern void real_2expN (REAL_VALUE_TYPE *, int, format_helper);
extern unsigned int real_hash (const REAL_VALUE_TYPE *);
extern const struct real_format decimal_quad_format;
extern const struct real_format ieee_half_format;
extern const struct real_format arm_half_format;
+extern const struct real_format arm_bfloat_half_format;
/* ====================================================================== */
/* Crap. */
-#define REAL_ARITHMETIC(value, code, d1, d2) \
- real_arithmetic (&(value), code, &(d1), &(d2))
-
/* Determine whether a floating-point value X is infinite. */
#define REAL_VALUE_ISINF(x) real_isinf (&(x))
/* Determine whether a floating-point value X is a NaN. */
#define REAL_VALUE_ISNAN(x) real_isnan (&(x))
+/* Determine whether a floating-point value X is a signaling NaN. */
+#define REAL_VALUE_ISSIGNALING_NAN(x) real_issignaling_nan (&(x))
+
/* Determine whether a floating-point value X is negative. */
#define REAL_VALUE_NEGATIVE(x) real_isneg (&(x))
/* 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))
+ float_mode_for_size (LONG_DOUBLE_TYPE_SIZE).require ())
#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
- real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0))
+ real_to_target (OUT, &(IN), float_mode_for_size (64).require ())
/* 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)))
+ ((OUT) = real_to_target (NULL, &(IN), float_mode_for_size (32).require ()))
/* Real values to IEEE 754 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))
+ real_to_target (OUT, &(IN), decimal_float_mode_for_size (128).require ())
#define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \
- real_to_target (OUT, &(IN), mode_for_size (64, MODE_DECIMAL_FLOAT, 0))
+ real_to_target (OUT, &(IN), decimal_float_mode_for_size (64).require ())
/* 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)))
+ ((OUT) = real_to_target (NULL, &(IN), \
+ decimal_float_mode_for_size (32).require ()))
-extern REAL_VALUE_TYPE real_value_truncate (machine_mode,
- REAL_VALUE_TYPE);
+extern REAL_VALUE_TYPE real_value_truncate (format_helper, REAL_VALUE_TYPE);
extern REAL_VALUE_TYPE real_value_negate (const REAL_VALUE_TYPE *);
extern REAL_VALUE_TYPE real_value_abs (const REAL_VALUE_TYPE *);
-extern int significand_size (machine_mode);
+extern int significand_size (format_helper);
-extern REAL_VALUE_TYPE real_from_string2 (const char *, machine_mode);
+extern REAL_VALUE_TYPE real_from_string2 (const char *, format_helper);
#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)
+ const_double_from_real_value (real_from_string2 (s, m), m)
#define REAL_VALUE_FIX(r) \
real_to_integer (&(r))
extern REAL_VALUE_TYPE dconstm1;
extern REAL_VALUE_TYPE dconsthalf;
-#define dconst_e() (*dconst_e_ptr ())
-#define dconst_third() (*dconst_third_ptr ())
-#define dconst_sqrt2() (*dconst_sqrt2_ptr ())
+#define dconst_e() (*dconst_e_ptr ())
+#define dconst_third() (*dconst_third_ptr ())
+#define dconst_quarter() (*dconst_quarter_ptr ())
+#define dconst_sixth() (*dconst_sixth_ptr ())
+#define dconst_ninth() (*dconst_ninth_ptr ())
+#define dconst_sqrt2() (*dconst_sqrt2_ptr ())
/* Function to return the real value special constant 'e'. */
extern const REAL_VALUE_TYPE * dconst_e_ptr (void);
-/* Returns the special REAL_VALUE_TYPE corresponding to 1/3. */
-extern const REAL_VALUE_TYPE * dconst_third_ptr (void);
+/* Returns a cached REAL_VALUE_TYPE corresponding to 1/n, for various n. */
+extern const REAL_VALUE_TYPE *dconst_third_ptr (void);
+extern const REAL_VALUE_TYPE *dconst_quarter_ptr (void);
+extern const REAL_VALUE_TYPE *dconst_sixth_ptr (void);
+extern const REAL_VALUE_TYPE *dconst_ninth_ptr (void);
/* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2). */
extern const REAL_VALUE_TYPE * dconst_sqrt2_ptr (void);
from a given integer constant. */
REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree);
-/* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
-#define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
- ((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 (REAL_VALUE_TYPE, machine_mode);
-/* Replace R by 1/R in the given machine mode, if the result is exact. */
-extern bool exact_real_inverse (machine_mode, REAL_VALUE_TYPE *);
+/* Replace R by 1/R in the given format, if the result is exact. */
+extern bool exact_real_inverse (format_helper, REAL_VALUE_TYPE *);
/* Return true if arithmetic on values in IMODE that were promoted
from values in TMODE is equivalent to direct arithmetic on values
/* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */
extern tree build_real (tree, REAL_VALUE_TYPE);
-/* Calculate R as X raised to the integer exponent N in mode MODE. */
-extern bool real_powi (REAL_VALUE_TYPE *, machine_mode,
+/* Likewise, but first truncate the value to the type. */
+extern tree build_real_truncate (tree, REAL_VALUE_TYPE);
+
+/* Calculate R as X raised to the integer exponent N in format FMT. */
+extern bool real_powi (REAL_VALUE_TYPE *, format_helper,
const REAL_VALUE_TYPE *, HOST_WIDE_INT);
/* Standard round to integer value functions. */
-extern void real_trunc (REAL_VALUE_TYPE *, machine_mode,
+extern void real_trunc (REAL_VALUE_TYPE *, format_helper,
const REAL_VALUE_TYPE *);
-extern void real_floor (REAL_VALUE_TYPE *, machine_mode,
+extern void real_floor (REAL_VALUE_TYPE *, format_helper,
const REAL_VALUE_TYPE *);
-extern void real_ceil (REAL_VALUE_TYPE *, machine_mode,
+extern void real_ceil (REAL_VALUE_TYPE *, format_helper,
const REAL_VALUE_TYPE *);
-extern void real_round (REAL_VALUE_TYPE *, machine_mode,
+extern void real_round (REAL_VALUE_TYPE *, format_helper,
const REAL_VALUE_TYPE *);
+extern void real_roundeven (REAL_VALUE_TYPE *, format_helper,
+ 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 *);
/* Check whether the real constant value given is an integer. */
-extern bool real_isinteger (const REAL_VALUE_TYPE *c, machine_mode mode);
+extern bool real_isinteger (const REAL_VALUE_TYPE *, format_helper);
+extern bool real_isinteger (const REAL_VALUE_TYPE *, HOST_WIDE_INT *);
+
+/* Calculate nextafter (X, Y) in format FMT. */
+extern bool real_nextafter (REAL_VALUE_TYPE *, format_helper,
+ const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
/* Write into BUF the maximum representable finite floating-point
number, (1 - b**-p) * b**emax for a given FP format FMT as a hex
float string. BUF must be large enough to contain the result. */
-extern void get_max_float (const struct real_format *, char *, size_t);
+extern void get_max_float (const struct real_format *, char *, size_t, bool);
#ifndef GENERATOR_FILE
/* real related routines. */
extern wide_int real_to_integer (const REAL_VALUE_TYPE *, bool *, int);
-extern void real_from_integer (REAL_VALUE_TYPE *, machine_mode,
+extern void real_from_integer (REAL_VALUE_TYPE *, format_helper,
const wide_int_ref &, signop);
#endif
+/* Fills r with the largest value such that 1 + r*r won't overflow.
+ This is used in both sin (atan (x)) and cos (atan(x)) optimizations. */
+extern void build_sinatan_real (REAL_VALUE_TYPE *, tree);
+
#endif /* ! GCC_REAL_H */
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