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| author | Xiaolin Tang <tangxiaolin@loongson.cn> | 2022-11-23 11:45:00 +0800 |
|---|---|---|
| committer | caiyinyu <caiyinyu@loongson.cn> | 2022-11-29 16:00:28 +0800 |
| commit | 2e2485ce05bce85bf092ba0752854afa14b92dad (patch) | |
| tree | 4138377bc399d8368b1e838941f12889ff4c8495 /sysdeps/ieee754 | |
| parent | f711e4ef53990b6c76f2dfdbcb9f791c541cdac3 (diff) | |
| download | glibc-2e2485ce05bce85bf092ba0752854afa14b92dad.tar glibc-2e2485ce05bce85bf092ba0752854afa14b92dad.tar.gz glibc-2e2485ce05bce85bf092ba0752854afa14b92dad.tar.bz2 glibc-2e2485ce05bce85bf092ba0752854afa14b92dad.zip | |
Use GCC builtins for logb functions if desired.
This patch is using the corresponding GCC builtin for logbf, logb,
logbl and logbf128 if the USE_FUNCTION_BUILTIN macros are defined to one
in math-use-builtins-function.h.
Co-Authored-By: Xi Ruoyao <xry111@xry111.site>
Diffstat (limited to 'sysdeps/ieee754')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_logb.c | 5 | ||||
| -rw-r--r-- | sysdeps/ieee754/float128/float128_private.h | 2 | ||||
| -rw-r--r-- | sysdeps/ieee754/flt-32/s_logbf.c | 5 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/s_logbl.c | 6 |
4 files changed, 18 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_logb.c b/sysdeps/ieee754/dbl-64/s_logb.c index 82cabd206a..dd74d5f08c 100644 --- a/sysdeps/ieee754/dbl-64/s_logb.c +++ b/sysdeps/ieee754/dbl-64/s_logb.c @@ -21,10 +21,14 @@ #include <math_private.h> #include <libm-alias-double.h> #include <fix-int-fp-convert-zero.h> +#include <math-use-builtins.h> double __logb (double x) { +#if USE_LOGB_BUILTIN + return __builtin_logb (x); +#else int64_t ix, ex; EXTRACT_WORDS64 (ix, x); @@ -42,6 +46,7 @@ __logb (double x) if (FIX_INT_FP_CONVERT_ZERO && ex == 1023) return 0.0; return (double) (ex - 1023); +#endif /* !USE_LOGB_BUILTIN */ } #ifndef __logb libm_alias_double (__logb, logb) diff --git a/sysdeps/ieee754/float128/float128_private.h b/sysdeps/ieee754/float128/float128_private.h index 3bb5fffa74..78107b1525 100644 --- a/sysdeps/ieee754/float128/float128_private.h +++ b/sysdeps/ieee754/float128/float128_private.h @@ -165,6 +165,8 @@ #define USE_LRINTL_BUILTIN USE_LRINTF128_BUILTIN #undef USE_LLRINTL_BUILTIN #define USE_LLRINTL_BUILTIN USE_LLRINTF128_BUILTIN +#undef USE_LOGBL_BUILTIN +#define USE_LOGBL_BUILTIN USE_LOGBF128_BUILTIN /* IEEE function renames. */ #define __ieee754_acoshl __ieee754_acoshf128 diff --git a/sysdeps/ieee754/flt-32/s_logbf.c b/sysdeps/ieee754/flt-32/s_logbf.c index a06f975797..b027e7b9c2 100644 --- a/sysdeps/ieee754/flt-32/s_logbf.c +++ b/sysdeps/ieee754/flt-32/s_logbf.c @@ -16,10 +16,14 @@ #include <math_private.h> #include <libm-alias-float.h> #include <fix-int-fp-convert-zero.h> +#include <math-use-builtins.h> float __logbf (float x) { +#if USE_LOGBF_BUILTIN + return __builtin_logbf (x); +#else int32_t ix, rix; GET_FLOAT_WORD (ix, x); @@ -37,5 +41,6 @@ __logbf (float x) if (FIX_INT_FP_CONVERT_ZERO && rix == 127) return 0.0f; return (float) (rix - 127); +#endif /* ! USE_LOGBF_BUILTIN */ } libm_alias_float (__logb, logb) diff --git a/sysdeps/ieee754/ldbl-128/s_logbl.c b/sysdeps/ieee754/ldbl-128/s_logbl.c index 1c56eda499..59b08aa295 100644 --- a/sysdeps/ieee754/ldbl-128/s_logbl.c +++ b/sysdeps/ieee754/ldbl-128/s_logbl.c @@ -25,10 +25,15 @@ static char rcsid[] = "$NetBSD: $"; #include <math.h> #include <math_private.h> #include <libm-alias-ldouble.h> +#include <math-use-builtins.h> _Float128 __logbl (_Float128 x) { +#if USE_LOGBL_BUILTIN + return __builtin_logbl (x); +#else + /* Use generic implementation. */ int64_t lx, hx, ex; GET_LDOUBLE_WORDS64 (hx, lx, x); @@ -49,6 +54,7 @@ __logbl (_Float128 x) ex -= ma - 16; } return (_Float128) (ex - 16383); +#endif /* ! USE_LOGBL_BUILTIN */ } libm_alias_ldouble (__logb, logb) |