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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 /ChangeLog | |
| parent | 0f9e585480edcdf1e30dc3d79e24b84aeee516fa (diff) | |
| download | glibc-96d6fd6c4060d739abb1822e7ad633af749532b2.zip glibc-96d6fd6c4060d739abb1822e7ad633af749532b2.tar.gz glibc-96d6fd6c4060d739abb1822e7ad633af749532b2.tar.bz2 | |
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 'ChangeLog')
| -rw-r--r-- | ChangeLog | 19 |
1 files changed, 19 insertions, 0 deletions
@@ -1,3 +1,22 @@ +2015-01-13 Adhemerval Zanella <azanella@linux.vnet.ibm.com> + + * sysdeps/powerpc/powerpc64/multiarch/Makefile [sysdep_routines]: Add + strcpy-power8 and stpcpy-power8 objects. + * sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c + (__libc_ifunc_impl_list): Add __strcpy_power8 and __stpcpy_power8 + implementations. + * sysdeps/powerpc/powerpc64/multiarch/stpcpy-power8.S: New file: + multiarch stpcpy implementation for POWER8. + * sysdeps/powerpc/powerpc64/multiarch/strcpy-power8.S: New file; + multiarch strcpy implementation for POWER8. + * sysdeps/powerpc/powerpc64/multiarch/strcpy.c (strcpy): Add + __strcpy_power8 function. + * sysdeps/powerpc/powerpc64/power8/stpcpy.S: New file: optimized + stpcpy for POWER8. + * sysdeps/powerpc/powerpc64/power8/strcpy.S: New file: optimized + strcpy for POWER8. + * NEWS: Update. + 2015-01-13 Leonhard Holz <leonhard.holz@web.de> [BZ #16009] |