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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/dbl-64 | |
| parent | 36e9acbd5cb2c330c0d53195db4a0ee31f2c3097 (diff) | |
| download | glibc-ae3577f607b50bf3ce9b0877e43ad2508c9da61b.zip glibc-ae3577f607b50bf3ce9b0877e43ad2508c9da61b.tar.gz glibc-ae3577f607b50bf3ce9b0877e43ad2508c9da61b.tar.bz2 | |
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/dbl-64')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_nearbyint.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_nearbyint.c b/sysdeps/ieee754/dbl-64/s_nearbyint.c index c261885..2deaeb2 100644 --- a/sysdeps/ieee754/dbl-64/s_nearbyint.c +++ b/sysdeps/ieee754/dbl-64/s_nearbyint.c @@ -26,16 +26,20 @@ #include <math_private.h> #include <fenv_private.h> #include <libm-alias-double.h> - -static const double -TWO52[2] = { - 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */ - -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */ -}; +#include <math-use-builtins.h> double __nearbyint (double x) { +#if USE_NEARBYINT_BUILTIN + return __builtin_nearbyint (x); +#else + /* Use generic implementation. */ + static const double + TWO52[2] = { + 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */ + -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */ + }; fenv_t env; int64_t i0, sx; int32_t j0; @@ -67,5 +71,6 @@ __nearbyint (double x) math_force_eval (t); libc_fesetenv (&env); return t; +#endif /* ! USE_NEARBYINT_BUILTIN */ } libm_alias_double (__nearbyint, nearbyint) |