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#
# ConvertAsm.py: Automatically generated from CopyMem.asm
#
#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2008, 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
# )
#------------------------------------------------------------------------------
.intel_syntax noprefix
.globl ASM_PFX(InternalMemCopyMem)
ASM_PFX(InternalMemCopyMem):
push rsi
push rdi
mov rsi, rdx # rsi <- Source
mov rdi, rcx # rdi <- Destination
lea r9, [rsi + r8 - 1] # r9 <- End of Source
cmp rsi, rdi
mov rax, rdi # rax <- Destination as return value
jae L0
cmp r9, rdi
jae L_CopyBackward # Copy backward if overlapped
L0:
mov rcx, r8
and r8, 7
shr rcx, 3 # rcx <- # of Qwords to copy
jz L_CopyBytes
movd r10, mm0 # (Save mm0 in r10)
L1:
movq mm0, [rsi]
movntq [rdi], mm0
add rsi, 8
add rdi, 8
loop L1
mfence
movd mm0, r10 # (Restore mm0)
jmp L_CopyBytes
L_CopyBackward:
mov rsi, r9 # rsi <- End of Source
lea rdi, [rdi + r8 - 1] # rdi <- End of Destination
std # set direction flag
L_CopyBytes:
mov rcx, r8
rep movsb # Copy bytes backward
cld
pop rdi
pop rsi
ret
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