MdePkg/Library/BaseMemoryLibSse2/X64/SetMem.S File Reference
Detailed Description
#
# ConvertAsm.py: Automatically generated from
SetMem.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:
#
# SetMem.S
#
# Abstract:
#
# SetMem function
#
# Notes:
#
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# VOID *
# EFIAPI
# InternalMemSetMem (
# IN VOID *Buffer,
# IN UINTN Count,
# IN UINT8 Value
# )
#------------------------------------------------------------------------------
ASM_GLOBAL
ASM_PFX(InternalMemSetMem)
ASM_PFX(InternalMemSetMem):
pushq rdi
movq rcx, rdi # rdi <- Buffer
movb r8b, al # al <- Value
movq rdi, r9 # r9 <- Buffer as return value
xorq rcx, rcx
subq rdi, rcx
andq $15, rcx # rcx + rdi aligns on 16-byte boundary
jz L0
cmpq rdx, rcx
cmova rdx, rcx
subq rcx, rdx
rep stosb
L0:
movq rdx, rcx
andq $15, rdx
shrq $4, rcx
jz L_SetBytes
movb al, ah # ax <- Value repeats twice
movdqa xmm0, 0x10(rsp) # save xmm0
movd eax, xmm0 # xmm0[0..16] <- Value repeats twice
pshuflw $0, xmm0, xmm0 # xmm0[0..63] <- Value repeats 8 times
movlhps xmm0, xmm0 # xmm0 <- Value repeats 16 times
L1:
movntdq xmm0, (rdi) # rdi should be 16-byte aligned
add $16, rdi
loop L1
mfence
movdqa 0x10(rsp), xmm0 # restore xmm0
L_SetBytes:
movl edx, ecx # high 32 bits of rcx are always zero
rep stosb
movq r9, rax # rax <- Return value
popq rdi
ret