#

# ConvertAsm.py: Automatically generated from CopyMem.asm

#

#------------------------------------------------------------------------------

#

# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>

# 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 <- Last byte of Source

cmpq %rdi, %rsi

movq %rdi, %rax # rax <- Destination as return value

jae L0 # Copy forward if Source > Destination

cmpq %rdi, %r9 # Overlapped?

jae L_CopyBackward # Copy backward if overlapped

L0:

xorq %rcx, %rcx

subq %rdi, %rcx # rcx <- -rdi

andq $15, %rcx # rcx + rsi should be 16 bytes aligned

jz L1 # skip if rcx == 0

cmpq %r8, %rcx

cmova %r8, %rcx

subq %rcx, %r8

rep movsb

L1:

movq %r8, %rcx

andq $15, %r8

shrq $4, %rcx # rcx <- # of DQwords to copy

jz L_CopyBytes

movdqu %xmm0, 0x18(%rsp) # save xmm0 on stack

L2:

movdqu (%rsi), %xmm0 # rsi may not be 16-byte aligned

movntdq %xmm0, (%rdi) # rdi should be 16-byte aligned

addq $16, %rsi

addq $16, %rdi

loop L2

mfence

movdqa 0x18(%rsp), %xmm0 # restore xmm0

jmp L_CopyBytes # copy remaining bytes

L_CopyBackward:

movq %r9, %rsi # rsi <- Last byte of Source

leaq -1(%rdi, %r8,), %rdi # rdi <- Last byte of Destination

std

L_CopyBytes:

movq %r8, %rcx

rep movsb

cld

popq %rdi

popq %rsi

ret