diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.asm')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.asm | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.asm b/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.asm index 372c365203..801cf92750 100644 --- a/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.asm +++ b/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.asm @@ -46,6 +46,7 @@ InternalMemCopyMem PROC USES rsi rdi and r8, 7
shr rcx, 3 ; rcx <- # of Qwords to copy
jz @CopyBytes
+ DB 49h, 0fh, 7eh, 0c2h ; movq r10, mm0 ; save mm0
@@:
DB 48h, 0fh, 6fh, 06h ; movq mm0, [rsi]
DB 48h, 0fh, 0e7h, 07h ; movntq [rdi], mm0
@@ -53,6 +54,7 @@ InternalMemCopyMem PROC USES rsi rdi add rdi, 8
loop @B
mfence
+ DB 49h, 0fh, 6eh, 0c2h ; movq mm0, r10 ; restore mm0
jmp @CopyBytes
@CopyBackward:
mov rdi, r9 ; rdi <- End of Destination
|