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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 /sysdeps/x86_64/fpu/multiarch/s_trunc.c | |
| 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 'sysdeps/x86_64/fpu/multiarch/s_trunc.c')
| -rw-r--r-- | sysdeps/x86_64/fpu/multiarch/s_trunc.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/sysdeps/x86_64/fpu/multiarch/s_trunc.c b/sysdeps/x86_64/fpu/multiarch/s_trunc.c new file mode 100644 index 0000000000..fb27fc3ec9 --- /dev/null +++ b/sysdeps/x86_64/fpu/multiarch/s_trunc.c @@ -0,0 +1,29 @@ +/* Multiple versions of __trunc. + Copyright (C) 2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#define trunc __redirect_trunc +#define __trunc __redirect___trunc +#include <math.h> +#undef trunc +#undef __trunc + +#define SYMBOL_NAME trunc +#include "ifunc-sse4_1.h" + +libc_ifunc_redirected (__redirect_trunc, __trunc, IFUNC_SELECTOR ()); +weak_alias (__trunc, trunc) |