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powerpc: Optimize memrchr for power8

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Vectorized loops are used for sizes greater than 32B to improve
performance over power7 optimization.  This shows as an average
of 25% improvement depending on the position of search
character.  The performance is same for shorter strings.
This commit is contained in:
Rajalakshmi Srinivasaraghavan
2017-10-02 17:31:13 +05:30
parent 397286ea93
commit 59ba2d2b54
6 changed files with 380 additions and 3 deletions
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3
sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
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@@ -193,6 +193,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
/* Support sysdeps/powerpc/powerpc64/multiarch/memrchr.c. */
IFUNC_IMPL (i, name, memrchr,
IFUNC_IMPL_ADD (array, i, memrchr,
hwcap2 & PPC_FEATURE2_ARCH_2_07,
__memrchr_power8)
IFUNC_IMPL_ADD (array, i, memrchr,
hwcap & PPC_FEATURE_HAS_VSX,
__memrchr_power7)