34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
commit 820504e3edd7276bf869d543ad5b57187ff9c9b6
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Author: Noah Goldstein <goldstein.w.n@gmail.com>
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Date: Fri Jun 3 18:52:37 2022 -0500
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x86: ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST expect no transactions
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Give fall-through path to `vzeroupper` and taken-path to `vzeroall`.
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Generally even on machines with RTM the expectation is the
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string-library functions will not be called in transactions.
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Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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(cherry picked from commit c28db9cb29a7d6cf3ce08fd8445e6b7dea03f35b)
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diff --git a/sysdeps/x86_64/sysdep.h b/sysdeps/x86_64/sysdep.h
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index 93e44be22e2275f1..04478b097cdffe20 100644
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--- a/sysdeps/x86_64/sysdep.h
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+++ b/sysdeps/x86_64/sysdep.h
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@@ -99,11 +99,11 @@ lose: \
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to avoid RTM abort triggered by VZEROUPPER inside transactionally. */
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#define ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST \
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xtest; \
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- jz 1f; \
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- vzeroall; \
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+ jnz 1f; \
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+ vzeroupper; \
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ret; \
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1: \
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- vzeroupper; \
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+ vzeroall; \
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ret
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/* Can be used to replace vzeroupper that is not directly before a
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