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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 | a2a9b004297b777758420c952cb6eea5985d37fe (patch) | |
| tree | 247d1784ddc3b3940b6e5439e19373d1c94fd930 /sysdeps/ieee754/flt-32 | |
| parent | ae3577f607b50bf3ce9b0877e43ad2508c9da61b (diff) | |
| download | glibc-a2a9b004297b777758420c952cb6eea5985d37fe.zip glibc-a2a9b004297b777758420c952cb6eea5985d37fe.tar.gz glibc-a2a9b004297b777758420c952cb6eea5985d37fe.tar.bz2 | |
Use GCC builtins for rint functions if desired.
This patch is using the corresponding GCC builtin for rintf, rint,
rintl and rintf128 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_rintf.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/sysdeps/ieee754/flt-32/s_rintf.c b/sysdeps/ieee754/flt-32/s_rintf.c index 0306dc2..34c16ea 100644 --- a/sysdeps/ieee754/flt-32/s_rintf.c +++ b/sysdeps/ieee754/flt-32/s_rintf.c @@ -17,16 +17,20 @@ #include <math.h> #include <math_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 __rintf(float x) { +#if USE_RINTF_BUILTIN + return __builtin_rintf (x); +#else + /* Use generic implementation. */ + static const float + TWO23[2] = { + 8.3886080000e+06, /* 0x4b000000 */ + -8.3886080000e+06, /* 0xcb000000 */ + }; int32_t i0,j0,sx; float w,t; GET_FLOAT_WORD(i0,x); @@ -46,6 +50,7 @@ __rintf(float x) } w = TWO23[sx]+x; return w-TWO23[sx]; +#endif /* ! USE_RINTF_BUILTIN */ } #ifndef __rintf libm_alias_float (__rint, rint) |