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Enable inlining issignalingf within glibc

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issignalingf is a very small function used in some areas where
better performance (and smaller code) might be helpful.

Create inline implementation for issignalingf.

Reviewed-by: Joseph Myers <joseph@codesourcery.com>
This commit is contained in:
Paul A. Clarke 2019-11-21 09:39:48 -06:00
parent fcb04b9aed
commit 854e91bf6b
2 changed files with 53 additions and 29 deletions
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53
include/math.h
View File

@ -54,6 +54,59 @@ libm_hidden_proto (__expf128)
libm_hidden_proto (__expm1f128)
# endif
#include <stdint.h>
#include <nan-high-order-bit.h>
/* A union which permits us to convert between a float and a 32 bit
int. */
typedef union
{
float value;
uint32_t word;
} ieee_float_shape_type;
/* Get a 32 bit int from a float. */
#ifndef GET_FLOAT_WORD
# define GET_FLOAT_WORD(i,d) \
do { \
ieee_float_shape_type gf_u; \
gf_u.value = (d); \
(i) = gf_u.word; \
} while (0)
#endif
/* Set a float from a 32 bit int. */
#ifndef SET_FLOAT_WORD
# define SET_FLOAT_WORD(d,i) \
do { \
ieee_float_shape_type sf_u; \
sf_u.word = (i); \
(d) = sf_u.value; \
} while (0)
#endif
extern inline int
__issignalingf (float x)
{
uint32_t xi;
GET_FLOAT_WORD (xi, x);
#if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
/* We only have to care about the high-order bit of x's significand, because
having it set (sNaN) already makes the significand different from that
used to designate infinity. */
return (xi & 0x7fc00000) == 0x7fc00000;
#else
/* To keep the following comparison simple, toggle the quiet/signaling bit,
so that it is set for sNaNs. This is inverse to IEEE 754-2008 (as well as
common practice for IEEE 754-1985). */
xi ^= 0x00400000;
/* We have to compare for greater (instead of greater or equal), because x's
significand being all-zero designates infinity not NaN. */
return (xi & 0x7fffffff) > 0x7fc00000;
#endif
}
# if __HAVE_DISTINCT_FLOAT128
/* __builtin_isinf_sign is broken in GCC < 7 for float128. */

29
sysdeps/generic/math_private.h
View File

@ -153,35 +153,6 @@ do { \
} while (0)
#endif
/* A union which permits us to convert between a float and a 32 bit
int. */
typedef union
{
float value;
uint32_t word;
} ieee_float_shape_type;
/* Get a 32 bit int from a float. */
#ifndef GET_FLOAT_WORD
# define GET_FLOAT_WORD(i,d) \
do { \
ieee_float_shape_type gf_u; \
gf_u.value = (d); \
(i) = gf_u.word; \
} while (0)
#endif
/* Set a float from a 32 bit int. */
#ifndef SET_FLOAT_WORD
# define SET_FLOAT_WORD(d,i) \
do { \
ieee_float_shape_type sf_u; \
sf_u.word = (i); \
(d) = sf_u.value; \
} while (0)
#endif
/* We need to guarantee an expansion of name when building
ldbl-128 files as another type (e.g _Float128). */
#define mathx_hidden_def(name) hidden_def(name)