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x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32

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Clear the upper 32 bits in RDX (memory size) for x32 to fix

FAIL: string/tst-size_t-memcmp
FAIL: string/tst-size_t-memcmp-2
FAIL: string/tst-size_t-memcpy
FAIL: wcsmbs/tst-size_t-wmemcmp

on x32 introduced by

8804157ad9 x86: Optimize memcmp SSE2 in memcmp.S
26b2478322 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3

Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit 8ea20ee5f6)
This commit is contained in:
H.J. Lu 2022-04-22 10:53:13 -07:00 committed by Sunil K Pandey
parent 4d1841deb7
commit bc35e22be4
1 changed files with 4 additions and 0 deletions
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4
sysdeps/x86_64/memcmp.S
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@ -46,6 +46,10 @@
.text
ENTRY(MEMCMP)
# ifdef __ILP32__
/* Clear the upper 32 bits. */
movl %edx, %edx
# endif
#ifdef USE_AS_WMEMCMP
/* Use 0xffff to test for mismatches on pmovmskb bitmask. Store
in ecx for code size. This is preferable to using `incw` as