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| author | Joseph Myers <joseph@codesourcery.com> | 2017-09-20 16:54:05 +0000 |
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| committer | Joseph Myers <joseph@codesourcery.com> | 2017-09-20 16:54:05 +0000 |
| commit | ae8372d7e4c44f6839aa3d851d4d0cb486b81cd5 (patch) | |
| tree | 83340587a4086402e9f1686c278aa1a264ef77e7 /io | |
| parent | a856d4d4a8a56eaefdddb58884bfa2bfe922ee4c (diff) | |
| download | glibc-ae8372d7e4c44f6839aa3d851d4d0cb486b81cd5.tar.gz glibc-ae8372d7e4c44f6839aa3d851d4d0cb486b81cd5.tar.xz glibc-ae8372d7e4c44f6839aa3d851d4d0cb486b81cd5.zip | |
Add SSE4.1 trunc, truncf (bug 20142).
This patch adds SSE4.1 versions of trunc and truncf, using the roundsd / roundss instructions, similar to the versions of ceil, floor, rint and nearbyint functions we already have. In my testing with the glibc benchtests these are about 30% faster than the C versions for double, 20% faster for float. Tested for x86_64. [BZ #20142] * sysdeps/x86_64/fpu/multiarch/Makefile (libm-sysdep_routines): Add s_trunc-c, s_truncf-c, s_trunc-sse4_1 and s_truncf-sse4_1. * sysdeps/x86_64/fpu/multiarch/s_trunc-c.c: New file. * sysdeps/x86_64/fpu/multiarch/s_trunc-sse4_1.S: Likewise. * sysdeps/x86_64/fpu/multiarch/s_trunc.c: Likewise. * sysdeps/x86_64/fpu/multiarch/s_truncf-c.c: Likewise. * sysdeps/x86_64/fpu/multiarch/s_truncf-sse4_1.S: Likewise. * sysdeps/x86_64/fpu/multiarch/s_truncf.c: Likewise.
Diffstat (limited to 'io')
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