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| author | Stefan Liebler <stli@linux.ibm.com> | 2019-12-11 15:09:24 +0100 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.ibm.com> | 2019-12-11 15:12:18 +0100 |
| commit | f82996f8159981619ac7ed8a4c1838c2ad72ab61 (patch) | |
| tree | 684c4c0fad4471c925d49b8772d60e35e9ca5de6 /sysdeps/ieee754/dbl-64 | |
| parent | 1ac9c1cf87216bf9f8ac4f7c9754d025d9f2c4ae (diff) | |
| download | glibc-f82996f8159981619ac7ed8a4c1838c2ad72ab61.zip glibc-f82996f8159981619ac7ed8a4c1838c2ad72ab61.tar.gz glibc-f82996f8159981619ac7ed8a4c1838c2ad72ab61.tar.bz2 | |
Use GCC builtins for round functions if desired.
This patch is using the corresponding GCC builtin for roundf, round,
roundl and roundf128 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')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_round.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_round.c b/sysdeps/ieee754/dbl-64/s_round.c index 8f4b7cf..7eb1ecb 100644 --- a/sysdeps/ieee754/dbl-64/s_round.c +++ b/sysdeps/ieee754/dbl-64/s_round.c @@ -23,11 +23,16 @@ #include <math_private.h> #include <libm-alias-double.h> #include <stdint.h> +#include <math-use-builtins.h> double __round (double x) { +#if USE_ROUND_BUILTIN + return __builtin_round (x); +#else + /* Use generic implementation. */ int64_t i0, j0; EXTRACT_WORDS64 (i0, x); @@ -62,5 +67,6 @@ __round (double x) INSERT_WORDS64 (x, i0); return x; +#endif /* ! USE_ROUND_BUILTIN */ } libm_alias_double (__round, round) |