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powerpc: Add optimized P8 strspn

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This utilizes vectors and bitmasks.  For small needle, large
haystack, the performance improvement is upto 8x.  For short
strings (0-4B), the cost of computing the bitmask dominates,
and is a tad slower.
This commit is contained in:
Paul E. Murphy
2016-03-14 17:40:46 -04:00
parent 1d2a8245ff
commit 25dba0ad05
7 changed files with 304 additions and 1 deletions
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8
sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
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@@ -322,6 +322,14 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
IFUNC_IMPL_ADD (array, i, strcat, 1,
__strcat_ppc))
/* Support sysdeps/powerpc/powerpc64/multiarch/strspn.c. */
IFUNC_IMPL (i, name, strspn,
IFUNC_IMPL_ADD (array, i, strspn,
hwcap2 & PPC_FEATURE2_ARCH_2_07,
__strspn_power8)
IFUNC_IMPL_ADD (array, i, strspn, 1,
__strspn_ppc))
/* Support sysdeps/powerpc/powerpc64/multiarch/strstr.c. */
IFUNC_IMPL (i, name, strstr,
IFUNC_IMPL_ADD (array, i, strstr,