34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
|
commit 820504e3edd7276bf869d543ad5b57187ff9c9b6
|
||
|
|
Author: Noah Goldstein <goldstein.w.n@gmail.com>
|
||
|
|
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 <hjl.tools@gmail.com>
|
||
|
|
|
||
|
|
(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
|