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| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-12-23 05:59:44 -0600 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2015-01-13 11:28:30 -0500 |
| commit | 96d6fd6c4060d739abb1822e7ad633af749532b2 (patch) | |
| tree | 3958c551f6b4e375b62cf08e3e30fd472a94acf7 /sysdeps/powerpc/powerpc64/multiarch/strcpy-power8.S | |
| parent | 0f9e585480edcdf1e30dc3d79e24b84aeee516fa (diff) | |
| download | glibc-96d6fd6c4060d739abb1822e7ad633af749532b2.tar.gz glibc-96d6fd6c4060d739abb1822e7ad633af749532b2.tar.xz glibc-96d6fd6c4060d739abb1822e7ad633af749532b2.zip | |
powerpc: Optimized st{r,p}cpy for POWER8/PPC64
This patch adds an optimized POWER8 strcpy using unaligned accesses. For strings up to 16 bytes the implementation first calculate the string size, like strlen, and issues a memcpy. For larger strings, source is first aligned to 16 bytes and then tested over a loop that reads 16 bytes am combine the cmpb results for speedup. Special case is added for page cross reads. It shows 30%-60% improvement over the optimized POWER7 one that uses only aligned accesses.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/multiarch/strcpy-power8.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/multiarch/strcpy-power8.S | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcpy-power8.S b/sysdeps/powerpc/powerpc64/multiarch/strcpy-power8.S new file mode 100644 index 0000000000..64cbc163a4 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/multiarch/strcpy-power8.S @@ -0,0 +1,40 @@ +/* Optimized strcpy implementation for POWER8/PPC64. + Copyright (C) 2015 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/>. */ + +#include <sysdep.h> + +#undef EALIGN +#define EALIGN(name, alignt, words) \ + .section ".text"; \ + ENTRY_2(__strcpy_power8) \ + .align ALIGNARG(alignt); \ + EALIGN_W_##words; \ + BODY_LABEL(__strcpy_power8): \ + cfi_startproc; \ + LOCALENTRY(__strcpy_power8) + +#undef END +#define END(name) \ + cfi_endproc; \ + TRACEBACK(__strcpy_power8) \ + END_2(__strcpy_power8) + +#undef libc_hidden_builtin_def +#define libc_hidden_builtin_def(name) + +#include <sysdeps/powerpc/powerpc64/power8/strcpy.S> |