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| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-07-15 12:19:09 -0400 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-09-10 07:39:46 -0400 |
| commit | 71ae86478edc7b21872464f43fb29ff650c1681a (patch) | |
| tree | a75679fa464a1d19543020ef0c4f4f982d099d99 /sysdeps/powerpc/powerpc64/multiarch/memset.c | |
| parent | 3b473fecdf4c52989cd915b649bb6d26c042d048 (diff) | |
| download | glibc-71ae86478edc7b21872464f43fb29ff650c1681a.tar.gz | |
PowerPC: memset optimization for POWER8/PPC64
This patch adds an optimized memset implementation for POWER8. For
sizes from 0 to 255 bytes, a word/doubleword algorithm similar to
POWER7 optimized one is used.
For size higher than 255 two strategies are used:
1. If the constant is different than 0, the memory is written with
altivec vector instruction;
2. If constant is 0, dbcz instructions are used. The loop is unrolled
to clear 512 byte at time.
Using vector instructions increases throughput considerable, with a
double performance for sizes larger than 1024. The dcbz loops unrolls
also shows performance improvement, by doubling throughput for sizes
larger than 8192 bytes.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/multiarch/memset.c')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/multiarch/memset.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memset.c b/sysdeps/powerpc/powerpc64/multiarch/memset.c index aa2ae7056e..9c7ed10c87 100644 --- a/sysdeps/powerpc/powerpc64/multiarch/memset.c +++ b/sysdeps/powerpc/powerpc64/multiarch/memset.c @@ -32,16 +32,19 @@ extern __typeof (__redirect_memset) __memset_ppc attribute_hidden; extern __typeof (__redirect_memset) __memset_power4 attribute_hidden; extern __typeof (__redirect_memset) __memset_power6 attribute_hidden; extern __typeof (__redirect_memset) __memset_power7 attribute_hidden; +extern __typeof (__redirect_memset) __memset_power8 attribute_hidden; /* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle ifunc symbol properly. */ libc_ifunc (__libc_memset, - (hwcap & PPC_FEATURE_HAS_VSX) - ? __memset_power7 : - (hwcap & PPC_FEATURE_ARCH_2_05) + (hwcap2 & PPC_FEATURE2_ARCH_2_07) + ? __memset_power8 : + (hwcap & PPC_FEATURE_HAS_VSX) + ? __memset_power7 : + (hwcap & PPC_FEATURE_ARCH_2_05) ? __memset_power6 : (hwcap & PPC_FEATURE_POWER4) - ? __memset_power4 + ? __memset_power4 : __memset_ppc); #undef memset |