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| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2015-01-09 16:04:26 -0500 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2015-01-13 14:35:40 -0500 |
| commit | d3b00f468bec441596877a685a19f43dee88657f (patch) | |
| tree | 2de8d805a29789d272de4eb416019aa68017e61d /sysdeps/powerpc/powerpc64/multiarch/strncmp.c | |
| parent | 72607db038df1a1a7987af814aad8d2ed466c45c (diff) | |
| download | glibc-d3b00f468bec441596877a685a19f43dee88657f.zip glibc-d3b00f468bec441596877a685a19f43dee88657f.tar.gz glibc-d3b00f468bec441596877a685a19f43dee88657f.tar.bz2 | |
powerpc: Optimized strncmp for POWER8/PPC64
This patch adds an optimized POWER8 strncmp. The implementation focus
on speeding up unaligned cases follwing the ideas of power8 strcmp.
The algorithm first check the initial 16 bytes, then align the first
function source and uses unaligned loads on second argument only.
Aditional checks for page boundaries are done for unaligned cases
(where sources alignment are different).
Diffstat (limited to 'sysdeps/powerpc/powerpc64/multiarch/strncmp.c')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/multiarch/strncmp.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp.c b/sysdeps/powerpc/powerpc64/multiarch/strncmp.c index eb02aac..9b6a659 100644 --- a/sysdeps/powerpc/powerpc64/multiarch/strncmp.c +++ b/sysdeps/powerpc/powerpc64/multiarch/strncmp.c @@ -25,13 +25,16 @@ extern __typeof (strncmp) __strncmp_ppc attribute_hidden; extern __typeof (strncmp) __strncmp_power4 attribute_hidden; extern __typeof (strncmp) __strncmp_power7 attribute_hidden; +extern __typeof (strncmp) __strncmp_power8 attribute_hidden; /* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle ifunc symbol properly. */ libc_ifunc (strncmp, - (hwcap & PPC_FEATURE_HAS_VSX) - ? __strncmp_power7 : - (hwcap & PPC_FEATURE_POWER4) + (hwcap2 & PPC_FEATURE2_ARCH_2_07) + ? __strncmp_power8 : + (hwcap & PPC_FEATURE_HAS_VSX) + ? __strncmp_power7 : + (hwcap & PPC_FEATURE_POWER4) ? __strncmp_power4 : __strncmp_ppc); #endif |