sravan/system76-edk2
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1. Updated function headers for all assembly function

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2. Optimized register usage in SetMemXX functions in all lib instances
3. Fixed a logical error in CopyMem for all lib instances


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1139 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
bxing
2006-07-28 07:28:19 +00:00
parent 27169a56e6
commit eb227e96bd
106 changed files with 1006 additions and 457 deletions
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27
MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.asm
View File

@@ -23,35 +23,27 @@
.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
@@ -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