commit 820504e3edd7276bf869d543ad5b57187ff9c9b6 Author: Noah Goldstein Date: Fri Jun 3 18:52:37 2022 -0500 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 (cherry picked from commit c28db9cb29a7d6cf3ce08fd8445e6b7dea03f35b) diff --git a/sysdeps/x86_64/sysdep.h b/sysdeps/x86_64/sysdep.h index 93e44be22e2275f1..04478b097cdffe20 100644 --- a/sysdeps/x86_64/sysdep.h +++ b/sysdeps/x86_64/sysdep.h @@ -99,11 +99,11 @@ lose: \ to avoid RTM abort triggered by VZEROUPPER inside transactionally. */ #define ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST \ xtest; \ - jz 1f; \ - vzeroall; \ + jnz 1f; \ + vzeroupper; \ ret; \ 1: \ - vzeroupper; \ + vzeroall; \ ret /* Can be used to replace vzeroupper that is not directly before a