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ppc64le: Revert "powerpc : Add optimized memchr for POWER10" (Bug 33059)

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This reverts commit b9182c793c

Reason for revert: Power10 memchr clobbers v20 vector register
(Bug 33059)

This is not a security issue, unlike CVE-2025-5745 and
CVE-2025-5702.

Tested on ppc64le without regression.
This commit is contained in:
Carlos O'Donell
2025-06-11 09:33:45 -04:00
parent c22de63588
commit a7877bb668
5 changed files with 11 additions and 369 deletions
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6
sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
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@@ -226,12 +226,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
/* Support sysdeps/powerpc/powerpc64/multiarch/memchr.c. */
IFUNC_IMPL (i, name, memchr,
#ifdef __LITTLE_ENDIAN__
IFUNC_IMPL_ADD (array, i, memchr,
hwcap2 & PPC_FEATURE2_ARCH_3_1
&& hwcap & PPC_FEATURE_HAS_VSX,
__memchr_power10)
#endif
IFUNC_IMPL_ADD (array, i, memchr,
hwcap2 & PPC_FEATURE2_ARCH_2_07
&& hwcap & PPC_FEATURE_HAS_ALTIVEC,