diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S')
-rw-r--r-- | MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S | 32 |
1 files changed, 14 insertions, 18 deletions
diff --git a/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S b/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S index fff8bde5ea..d644b34675 100644 --- a/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S +++ b/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S @@ -21,32 +21,29 @@ # #------------------------------------------------------------------------------ - .686: - #.MODEL flat,C - .xmm: - .code: +.global _InternalMemCopyMem #------------------------------------------------------------------------------ # VOID * -# _mem_CopyMem ( +# EFIAPI +# InternalMemCopyMem ( # IN VOID *Destination, # IN VOID *Source, # IN UINTN Count -# ) +# ); #------------------------------------------------------------------------------ -.global _InternalMemCopyMem _InternalMemCopyMem: push %esi push %edi movl 16(%esp), %esi # esi <- Source movl 12(%esp), %edi # edi <- Destination movl 20(%esp), %edx # edx <- Count - leal -1(%edi,%edx,), %eax # eax <- End of Destination + leal -1(%esi,%edx,), %eax # eax <- End of Source cmpl %edi, %esi jae L0 - cmpl %esi, %eax # Overlapped? + cmpl %edi, %eax # Overlapped? jae @CopyBackward # Copy backward if overlapped -L0: +L0: xorl %ecx, %ecx subl %esi, %ecx andl $7, %ecx # ecx + esi aligns on 8-byte boundary @@ -56,7 +53,7 @@ L0: subl %ecx, %edx # edx <- remaining bytes to copy rep movsb -L1: +L1: movl %edx, %ecx andl $7, %edx shrl $3, %ecx # ecx <- # of Qwords to copy @@ -64,22 +61,21 @@ L1: pushl %eax pushl %eax movq %mm0, (%esp) # save mm0 -L2: +L2: movq (%esi), %mm0 - movntq %mm0, (%edi) + movq %mm0, (%edi) addl $8, %esi addl $8, %edi loop L2 - mfence movq (%esp), %mm0 # restore mm0 popl %ecx # stack cleanup popl %ecx # stack cleanup jmp @CopyBytes -@CopyBackward: - movl %eax, %edi # edi <- Last byte in Destination - leal -1(%esi,%edx,), %esi # esi <- Last byte in Source +@CopyBackward: + movl %eax, %esi # esi <- Last byte in Source + leal -1(%edi,%edx,), %edi # edi <- Last byte in Destination std -@CopyBytes: +@CopyBytes: movl %edx, %ecx rep movsb |