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#
# ConvertAsm.py: Automatically generated from CopyMem.asm
#
#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2009, Intel Corporation
# All rights reserved. This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
# Module Name:
#
# CopyMem.S
#
# Abstract:
#
# CopyMem function
#
# Notes:
#
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# VOID *
# EFIAPI
# InternalMemCopyMem (
# IN VOID *Destination,
# IN VOID *Source,
# IN UINTN Count
# )
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(InternalMemCopyMem)
ASM_PFX(InternalMemCopyMem):
pushq %rsi
pushq %rdi
movq %rdx, %rsi # rsi <- Source
movq %rcx, %rdi # rdi <- Destination
leaq -1(%rsi, %r8,), %r9 # r9 <- End of Source
cmpq %rdi, %rsi
movq %rdi, %rax # rax <- Destination as return value
jae L0
cmpq %rdi, %r9
jae L_CopyBackward # Copy backward if overlapped
L0:
movq %r8, %rcx
andq $7, %r8
shrq $3, %rcx # rcx <- # of Qwords to copy
jz L_CopyBytes
movd %mm0, %r10 # (Save mm0 in r10)
L1:
movq (%rsi), %mm0
movntq %mm0, (%rdi)
addq $8, %rsi
addq $8, %rdi
loop L1
mfence
movd %r10, %mm0 # (Restore mm0)
jmp L_CopyBytes
L_CopyBackward:
movq %r9, %rsi # rsi <- End of Source
leaq -1(%rdi, %r8,), %rdi # rdi <- End of Destination
std # set direction flag
L_CopyBytes:
movq %r8, %rcx
rep movsb # Copy bytes backward
cld
popq %rdi
popq %rsi
ret
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