AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-21 12:30:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

Use GCC builtins for roundeven functions if desired.

Browse Source 
This patch is using the corresponding GCC builtin for roundevenf,
roundeven and roundevenl if the USE_FUNCTION_BUILTIN macros are defined
to one in math-use-builtins.h.

These builtin functions is supported since GCC 10.

The code of the generic implementation is not changed.

Signed-off-by: Shen-Ta Hsieh <ibmibmibm.tw@gmail.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
Shen-Ta Hsieh 2021-05-24 09:43:12 +08:00 committed by H.J. Lu
parent 1683249d17
commit eb9066203f
6 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sysdeps/generic/math-use-builtins-roundeven.h Normal file
View File

@ -0,0 +1,4 @@
#define USE_ROUNDEVEN_BUILTIN 0
#define USE_ROUNDEVENF_BUILTIN 0
#define USE_ROUNDEVENL_BUILTIN 0
#define USE_ROUNDEVENF128_BUILTIN 0

1
sysdeps/generic/math-use-builtins.h
View File

@ -30,6 +30,7 @@
#include <math-use-builtins-ceil.h>
#include <math-use-builtins-trunc.h>
#include <math-use-builtins-round.h>
#include <math-use-builtins-roundeven.h>
#include <math-use-builtins-copysign.h>
#include <math-use-builtins-sqrt.h>
#include <math-use-builtins-fma.h>

5
sysdeps/ieee754/dbl-64/s_roundeven.c
View File

@ -21,6 +21,7 @@
#include <math_private.h>
#include <libm-alias-double.h>
#include <stdint.h>
#include <math-use-builtins.h>
#define BIAS 0x3ff
#define MANT_DIG 53
@ -29,6 +30,9 @@
double
__roundeven (double x)
{
#if USE_ROUNDEVEN_BUILTIN
return __builtin_roundeven (x);
#else
uint64_t ix, ux;
EXTRACT_WORDS64 (ix, x);
ux = ix & 0x7fffffffffffffffULL;
@ -66,6 +70,7 @@ __roundeven (double x)
ix &= 0x8000000000000000ULL;
INSERT_WORDS64 (x, ix);
return x;
#endif /* ! USE_ROUNDEVEN_BUILTIN */
}
#ifndef __roundeven
libm_alias_double (__roundeven, roundeven)

2
sysdeps/ieee754/float128/float128_private.h
View File

@ -152,6 +152,8 @@
#define USE_TRUNCL_BUILTIN USE_TRUNCF128_BUILTIN
#undef USE_ROUNDL_BUILTIN
#define USE_ROUNDL_BUILTIN USE_ROUNDF128_BUILTIN
#undef USE_ROUNDEVENL_BUILTIN
#define USE_ROUNDEVENL_BUILTIN USE_ROUNDEVENF128_BUILTIN
#undef USE_COPYSIGNL_BUILTIN
#define USE_COPYSIGNL_BUILTIN USE_COPYSIGNF128_BUILTIN
#undef USE_FMAL_BUILTIN

5
sysdeps/ieee754/flt-32/s_roundevenf.c
View File

@ -21,6 +21,7 @@
#include <math.h>
#include <math_private.h>
#include <libm-alias-float.h>
#include <math-use-builtins.h>
#include <stdint.h>
#define BIAS 0x7f
@ -30,6 +31,9 @@
float
__roundevenf (float x)
{
#if USE_ROUNDEVENF_BUILTIN
return __builtin_roundevenf (x);
#else
uint32_t ix, ux;
GET_FLOAT_WORD (ix, x);
ux = ix & 0x7fffffff;
@ -67,6 +71,7 @@ __roundevenf (float x)
ix &= 0x80000000;
SET_FLOAT_WORD (x, ix);
return x;
#endif /* ! USE_ROUNDEVENF_BUILTIN */
}
#ifndef __roundevenf
libm_alias_float (__roundeven, roundeven)

5
sysdeps/ieee754/ldbl-128/s_roundevenl.c
View File

@ -21,6 +21,7 @@
#include <math.h>
#include <math_private.h>
#include <libm-alias-ldouble.h>
#include <math-use-builtins.h>
#include <stdint.h>
#define BIAS 0x3fff
@ -30,6 +31,9 @@
_Float128
__roundevenl (_Float128 x)
{
#if USE_ROUNDEVENL_BUILTIN
return __builtin_roundevenl (x);
#else
uint64_t hx, lx, uhx;
GET_LDOUBLE_WORDS64 (hx, lx, x);
uhx = hx & 0x7fffffffffffffffULL;
@ -101,5 +105,6 @@ __roundevenl (_Float128 x)
}
SET_LDOUBLE_WORDS64 (x, hx, lx);
return x;
#endif /* ! USE_ROUNDEVENL_BUILTIN */
}
libm_alias_ldouble (__roundeven, roundeven)