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-#------------------------------------------------------------------------------
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-#
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-# Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
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-# This program and the accompanying materials
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-# are licensed and made available under the terms and conditions of the BSD License
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-# which accompanies this distribution. The full text of the license may be found at
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-# http://opensource.org/licenses/bsd-license.php.
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-#
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-# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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-# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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-#
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-# Module Name:
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-#
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-# CopyMem.asm
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-#
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-# Abstract:
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-#
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-# CopyMem function
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-#
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-# Notes:
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-#
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-#------------------------------------------------------------------------------
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-
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-ASM_GLOBAL ASM_PFX(InternalMemCopyMem)
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-
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-#------------------------------------------------------------------------------
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-# VOID *
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-# EFIAPI
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-# InternalMemCopyMem (
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-# IN VOID *Destination,
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-# IN VOID *Source,
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-# IN UINTN Count
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-# );
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-#------------------------------------------------------------------------------
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-ASM_PFX(InternalMemCopyMem):
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- push %esi
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- push %edi
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- movl 16(%esp), %esi # esi <- Source
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- movl 12(%esp), %edi # edi <- Destination
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- movl 20(%esp), %edx # edx <- Count
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- leal -1(%esi,%edx,), %eax # eax <- End of Source
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- cmpl %edi, %esi
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- jae L0
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- cmpl %edi, %eax # Overlapped?
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- jae L_CopyBackward # Copy backward if overlapped
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-L0:
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- xorl %ecx, %ecx
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- subl %esi, %ecx
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- andl $7, %ecx # ecx + esi aligns on 8-byte boundary
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- jz L1
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- cmpl %edx, %ecx
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- cmova %edx, %ecx
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- subl %ecx, %edx # edx <- remaining bytes to copy
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- rep
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- movsb
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-L1:
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- movl %edx, %ecx
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- andl $7, %edx
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- shrl $3, %ecx # ecx <- # of Qwords to copy
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- jz L_CopyBytes
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- pushl %eax
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- pushl %eax
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- movq %mm0, (%esp) # save mm0
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-L2:
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- movq (%esi), %mm0
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- movq %mm0, (%edi)
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- addl $8, %esi
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- addl $8, %edi
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- loop L2
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- movq (%esp), %mm0 # restore mm0
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- popl %ecx # stack cleanup
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- popl %ecx # stack cleanup
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- jmp L_CopyBytes
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-L_CopyBackward:
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- movl %eax, %esi # esi <- Last byte in Source
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- leal -1(%edi,%edx,), %edi # edi <- Last byte in Destination
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- std
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-L_CopyBytes:
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- movl %edx, %ecx
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- rep
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- movsb
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- cld
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- movl 12(%esp), %eax
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- pop %edi
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- pop %esi
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- ret
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