MdePkg/Library/BaseMemoryLibSse2/X64/ZeroMem.S File Reference
Detailed Description
#
# ConvertAsm.py: Automatically generated from
ZeroMem.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:
#
# ZeroMem.S
#
# Abstract:
#
# ZeroMem function
#
# Notes:
#
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# VOID *
# InternalMemZeroMem (
# IN VOID *Buffer,
# IN UINTN Count
# );
#------------------------------------------------------------------------------
ASM_GLOBAL
ASM_PFX(InternalMemZeroMem)
ASM_PFX(InternalMemZeroMem):
pushq rdi
movq rcx, rdi
xorq rcx, rcx
xorl eax, eax
subq rdi, rcx
andq $15, rcx
movq rdi, r8
jz L0
cmpq rdx, rcx
cmova rdx, rcx
subq rcx, rdx
rep stosb
L0:
movq rdx, rcx
andl $15, edx
shrq $4, rcx
jz L_ZeroBytes
pxor xmm0, xmm0
L1:
movntdq xmm0, (rdi) # rdi should be 16-byte aligned
addq $16, rdi
loop L1
mfence
L_ZeroBytes:
movl edx, ecx
rep stosb
movq r8, rax
popq rdi
ret