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| author | Stefan Liebler <stli@linux.ibm.com> | 2019-12-11 15:09:18 +0100 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.ibm.com> | 2019-12-11 15:12:15 +0100 |
| commit | ae3577f607b50bf3ce9b0877e43ad2508c9da61b (patch) | |
| tree | b284b10fc26c0454a71be353759f3d2f892b06e0 /sysdeps/ieee754/flt-32 | |
| parent | 36e9acbd5cb2c330c0d53195db4a0ee31f2c3097 (diff) | |
| download | glibc-ae3577f607b50bf3ce9b0877e43ad2508c9da61b.tar.gz glibc-ae3577f607b50bf3ce9b0877e43ad2508c9da61b.tar.xz glibc-ae3577f607b50bf3ce9b0877e43ad2508c9da61b.zip | |
Use GCC builtins for nearbyint functions if desired.
This patch is using the corresponding GCC builtin for nearbyintf, nearbyint, nearbintl and nearbyintf128 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/flt-32')
| -rw-r--r-- | sysdeps/ieee754/flt-32/s_nearbyintf.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/sysdeps/ieee754/flt-32/s_nearbyintf.c b/sysdeps/ieee754/flt-32/s_nearbyintf.c index acedf34c90..b37e003e12 100644 --- a/sysdeps/ieee754/flt-32/s_nearbyintf.c +++ b/sysdeps/ieee754/flt-32/s_nearbyintf.c @@ -21,16 +21,20 @@ #include <math_private.h> #include <fenv_private.h> #include <libm-alias-float.h> - -static const float -TWO23[2]={ - 8.3886080000e+06, /* 0x4b000000 */ - -8.3886080000e+06, /* 0xcb000000 */ -}; +#include <math-use-builtins.h> float __nearbyintf(float x) { +#if USE_NEARBYINTF_BUILTIN + return __builtin_nearbyintf (x); +#else + /* Use generic implementation. */ + static const float + TWO23[2] = { + 8.3886080000e+06, /* 0x4b000000 */ + -8.3886080000e+06, /* 0xcb000000 */ + }; fenv_t env; int32_t i0,j0,sx; float w,t; @@ -58,5 +62,6 @@ __nearbyintf(float x) math_force_eval (t); libc_fesetenvf (&env); return t; +#endif /* ! USE_NEARBYINT_BUILTIN */ } libm_alias_float (__nearbyint, nearbyint) |