diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.asm')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.asm | 27 |
1 files changed, 9 insertions, 18 deletions
diff --git a/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.asm b/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.asm index b709a809d5..1b8b3c5dcd 100644 --- a/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.asm +++ b/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.asm @@ -23,36 +23,28 @@ .686
.model flat,C
- .xmm
+ .mmx
.code
;------------------------------------------------------------------------------
; VOID *
-; _mem_CopyMem (
+; EFIAPI
+; InternalMemCopyMem (
; IN VOID *Destination,
; IN VOID *Source,
; IN UINTN Count
-; )
+; );
;------------------------------------------------------------------------------
InternalMemCopyMem PROC USES esi edi
mov esi, [esp + 16] ; esi <- Source
mov edi, [esp + 12] ; edi <- Destination
mov edx, [esp + 20] ; edx <- Count
- lea eax, [edi + edx - 1] ; eax <- End of Destination
+ lea eax, [esi + edx - 1] ; eax <- End of Source
cmp esi, edi
jae @F
- cmp eax, esi ; Overlapped?
+ cmp eax, edi ; Overlapped?
jae @CopyBackward ; Copy backward if overlapped
@@:
- xor ecx, ecx
- sub ecx, esi
- and ecx, 7 ; ecx + esi aligns on 8-byte boundary
- jz @F
- cmp ecx, edx
- cmova ecx, edx
- sub edx, ecx ; edx <- remaining bytes to copy
- rep movsb
-@@:
mov ecx, edx
and edx, 7
shr ecx, 3 ; ecx <- # of Qwords to copy
@@ -62,18 +54,17 @@ InternalMemCopyMem PROC USES esi edi movq [esp], mm0 ; save mm0
@@:
movq mm0, [esi]
- movntq [edi], mm0
+ movq [edi], mm0
add esi, 8
add edi, 8
loop @B
- mfence
movq mm0, [esp] ; restore mm0
pop ecx ; stack cleanup
pop ecx ; stack cleanup
jmp @CopyBytes
@CopyBackward:
- mov edi, eax ; edi <- Last byte in Destination
- lea esi, [esi + edx - 1] ; esi <- Last byte in Source
+ mov esi, eax ; esi <- Last byte in Source
+ lea edi, [edi + edx - 1] ; edi <- Last byte in Destination
std
@CopyBytes:
mov ecx, edx
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