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From: "rguenth at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug string/27457] vzeroupper use in AVX2 multiarch string functions
 cause HTM aborts
Date: Mon, 22 Feb 2021 15:00:04 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27457

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
More correct, the wcscmp path ends here with higher %ymm regs used

diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S
b/sysdeps/x86_64/multiarch/strcmp-avx2.S
index ee82fa3e19..bd3b6243e2 100644
--- a/sysdeps/x86_64/multiarch/strcmp-avx2.S
+++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S
@@ -122,13 +122,16 @@ L(wcscmp_return):
        negl    %eax
        orl     $1, %eax
 L(return):
+       VZEROUPPER
+       ret
 # else
        movzbl  (%rdi, %rdx), %eax
        movzbl  (%rsi, %rdx), %edx
        subl    %edx, %eax
-# endif
-       VZEROUPPER
+       vpxor   %ymm0, %ymm0, %ymm0
+       vpxor   %ymm1, %ymm1, %ymm1
        ret
+# endif

        .p2align 4
 L(return_vec_size):

--=20
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