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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/dbl-64 | |
| 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/dbl-64')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_rint.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_rint.c b/sysdeps/ieee754/dbl-64/s_rint.c index 66c9196..8604733 100644 --- a/sysdeps/ieee754/dbl-64/s_rint.c +++ b/sysdeps/ieee754/dbl-64/s_rint.c @@ -23,16 +23,20 @@ #include <math.h> #include <math_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 __rint (double x) { +#if USE_RINT_BUILTIN + return __builtin_rint (x); +#else + /* Use generic implementation. */ + static const double + TWO52[2] = { + 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */ + -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */ + }; int64_t i0, sx; int32_t j0; EXTRACT_WORDS64 (i0, x); @@ -59,6 +63,7 @@ __rint (double x) } double w = TWO52[sx] + x; return w - TWO52[sx]; +#endif /* ! USE_RINT_BUILTIN */ } #ifndef __rint libm_alias_double (__rint, rint) |