diff options
| -rw-r--r-- | sysdeps/x86_64/multiarch/avx-rtm-vecs.h | 1 | ||||
| -rw-r--r-- | sysdeps/x86_64/sysdep.h | 18 |
2 files changed, 19 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/avx-rtm-vecs.h b/sysdeps/x86_64/multiarch/avx-rtm-vecs.h index 3f531dd..6ca9f5e 100644 --- a/sysdeps/x86_64/multiarch/avx-rtm-vecs.h +++ b/sysdeps/x86_64/multiarch/avx-rtm-vecs.h @@ -20,6 +20,7 @@ #ifndef _AVX_RTM_VECS_H #define _AVX_RTM_VECS_H 1 +#define COND_VZEROUPPER COND_VZEROUPPER_XTEST #define ZERO_UPPER_VEC_REGISTERS_RETURN \ ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST diff --git a/sysdeps/x86_64/sysdep.h b/sysdeps/x86_64/sysdep.h index f14d507..4f512d5 100644 --- a/sysdeps/x86_64/sysdep.h +++ b/sysdeps/x86_64/sysdep.h @@ -106,6 +106,24 @@ lose: \ vzeroupper; \ ret +/* Can be used to replace vzeroupper that is not directly before a + return. This is useful when hoisting a vzeroupper from multiple + return paths to decrease the total number of vzerouppers and code + size. */ +#define COND_VZEROUPPER_XTEST \ + xtest; \ + jz 1f; \ + vzeroall; \ + jmp 2f; \ +1: \ + vzeroupper; \ +2: + +/* In RTM define this as COND_VZEROUPPER_XTEST. */ +#ifndef COND_VZEROUPPER +# define COND_VZEROUPPER vzeroupper +#endif + /* Zero upper vector registers and return. */ #ifndef ZERO_UPPER_VEC_REGISTERS_RETURN # define ZERO_UPPER_VEC_REGISTERS_RETURN \ |