diff options
| 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/power8/stpcpy.S | |
| parent | 0f9e585480edcdf1e30dc3d79e24b84aeee516fa (diff) | |
| download | glibc-96d6fd6c4060d739abb1822e7ad633af749532b2.tar.gz | |
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/power8/stpcpy.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/power8/stpcpy.S | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/power8/stpcpy.S b/sysdeps/powerpc/powerpc64/power8/stpcpy.S new file mode 100644 index 0000000000..bf72065114 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/power8/stpcpy.S @@ -0,0 +1,24 @@ +/* Optimized stpcpy implementation for PowerPC64/POWER8. + 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/>. */ + +#define USE_AS_STPCPY +#include <sysdeps/powerpc/powerpc64/power8/strcpy.S> + +weak_alias (__stpcpy, stpcpy) +libc_hidden_def (__stpcpy) +libc_hidden_builtin_def (stpcpy) |