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x86: ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST expect no transactions 

Give fall-through path to `vzeroupper` and taken-path to `vzeroall`.

Generally even on machines with RTM the expectation is the
string-library functions will not be called in transactions.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
Noah Goldstein 2022-06-03 18:52:37 -05:00
parent 56da3fe1dd
commit c28db9cb29
1 changed files with 3 additions and 3 deletions
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6
sysdeps/x86_64/sysdep.h
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@ -99,11 +99,11 @@ lose: \
to avoid RTM abort triggered by VZEROUPPER inside transactionally. */ to avoid RTM abort triggered by VZEROUPPER inside transactionally. */
#define ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST \ #define ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST \
xtest; \ xtest; \
jz 1f; \ jnz 1f; \
vzeroall; \ vzeroupper; \
ret; \ ret; \
1: \ 1: \
vzeroupper; \ vzeroall; \
ret ret
/* Can be used to replace vzeroupper that is not directly before a /* Can be used to replace vzeroupper that is not directly before a