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| author | Stefan Liebler <stli@linux.ibm.com> | 2019-12-11 15:09:20 +0100 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.ibm.com> | 2019-12-11 15:12:16 +0100 |
| commit | 6c1b6a5e8cd91e0e1965509ad91e627e60eb00a3 (patch) | |
| tree | 5fb98d8518228eb9b7d517826b360fb3196cf765 /sysdeps/ieee754/dbl-64/s_floor.c | |
| parent | a2a9b004297b777758420c952cb6eea5985d37fe (diff) | |
| download | glibc-6c1b6a5e8cd91e0e1965509ad91e627e60eb00a3.tar.gz glibc-6c1b6a5e8cd91e0e1965509ad91e627e60eb00a3.tar.xz glibc-6c1b6a5e8cd91e0e1965509ad91e627e60eb00a3.zip | |
Use GCC builtins for floor functions if desired.
This patch is using the corresponding GCC builtin for floorf, floor, floorl and floorf128 if the USE_FUNCTION_BUILTIN macros are defined to one in math-use-builtins.h. This is the case for s390 if build with at least --march=z196 --mzarch. Otherwise the generic implementation is used. The code of the generic implementation is not changed. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_floor.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_floor.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_floor.c b/sysdeps/ieee754/dbl-64/s_floor.c index ce0c42bdb6..78325214f4 100644 --- a/sysdeps/ieee754/dbl-64/s_floor.c +++ b/sysdeps/ieee754/dbl-64/s_floor.c @@ -35,6 +35,7 @@ #include <math_private.h> #include <stdint.h> #include <libm-alias-double.h> +#include <math-use-builtins.h> /* * floor(x) @@ -47,6 +48,10 @@ double __floor (double x) { +#if USE_FLOOR_BUILTIN + return __builtin_floor (x); +#else + /* Use generic implementation. */ int64_t i0; EXTRACT_WORDS64 (i0, x); int32_t j0 = ((i0 >> 52) & 0x7ff) - 0x3ff; @@ -74,6 +79,7 @@ __floor (double x) else if (j0 == 0x400) return x + x; /* inf or NaN */ return x; +#endif /* ! USE_FLOOR_BUILTIN */ } #ifndef __floor libm_alias_double (__floor, floor) |