[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibSse2 / X64 / ZeroMem.S

#\r
# ConvertAsm.py: Automatically generated from ZeroMem.asm\r
#\r
#------------------------------------------------------------------------------\r
#\r
# Copyright (c) 2006 - 2008, Intel Corporation\r
# All rights reserved. This program and the accompanying materials\r
# are licensed and made available under the terms and conditions of the BSD License\r
# which accompanies this distribution.  The full text of the license may be found at\r
# http://opensource.org/licenses/bsd-license.php\r
#\r
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
#\r
# Module Name:\r
#\r
#   ZeroMem.S\r
#\r
# Abstract:\r
#\r
#   ZeroMem function\r
#\r
# Notes:\r
#\r
#------------------------------------------------------------------------------\r
\r
\r
#------------------------------------------------------------------------------\r
#  VOID *\r
#  InternalMemZeroMem (\r
#    IN VOID   *Buffer,\r
#    IN UINTN  Count\r
#    );\r
#------------------------------------------------------------------------------\r
.intel_syntax noprefix\r
.globl ASM_PFX(InternalMemZeroMem)\r
ASM_PFX(InternalMemZeroMem):\r
    push    rdi\r
    mov     rdi, rcx\r
    xor     rcx, rcx\r
    xor     eax, eax\r
    sub     rcx, rdi\r
    and     rcx, 15\r
    mov     r8, rdi\r
    jz      L0\r
    cmp     rcx, rdx\r
    cmova   rcx, rdx\r
    sub     rdx, rcx\r
    rep     stosb\r
L0:\r
    mov     rcx, rdx\r
    and     edx, 15\r
    shr     rcx, 4\r
    jz      L_ZeroBytes\r
    pxor    xmm0, xmm0\r
L1:\r
    movntdq [rdi], xmm0                 # rdi should be 16-byte aligned\r
    add     rdi, 16\r
    loop    L1\r
    mfence\r
L_ZeroBytes:\r
    mov     ecx, edx\r
    rep     stosb\r
    mov     rax, r8\r
    pop     rdi\r
    ret\r
Commit	Line	Data
b1ff428c	1	#\r
	2	# ConvertAsm.py: Automatically generated from ZeroMem.asm\r
	3	#\r
	4	#------------------------------------------------------------------------------\r
	5	#\r
373ade0e	6	# Copyright (c) 2006 - 2008, Intel Corporation\r
b1ff428c	7	# All rights reserved. This program and the accompanying materials\r
	8	# are licensed and made available under the terms and conditions of the BSD License\r
	9	# which accompanies this distribution. The full text of the license may be found at\r
	10	# http://opensource.org/licenses/bsd-license.php\r
	11	#\r
	12	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	13	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	14	#\r
	15	# Module Name:\r
	16	#\r
	17	# ZeroMem.S\r
	18	#\r
	19	# Abstract:\r
	20	#\r
	21	# ZeroMem function\r
	22	#\r
	23	# Notes:\r
	24	#\r
	25	#------------------------------------------------------------------------------\r
	26	\r
	27	\r
	28	#------------------------------------------------------------------------------\r
	29	# VOID *\r
	30	# InternalMemZeroMem (\r
	31	# IN VOID *Buffer,\r
	32	# IN UINTN Count\r
	33	# );\r
	34	#------------------------------------------------------------------------------\r
	35	.intel_syntax noprefix\r
	36	.globl ASM_PFX(InternalMemZeroMem)\r
	37	ASM_PFX(InternalMemZeroMem):\r
	38	push rdi\r
	39	mov rdi, rcx\r
	40	xor rcx, rcx\r
	41	xor eax, eax\r
	42	sub rcx, rdi\r
	43	and rcx, 15\r
	44	mov r8, rdi\r
	45	jz L0\r
	46	cmp rcx, rdx\r
	47	cmova rcx, rdx\r
	48	sub rdx, rcx\r
	49	rep stosb\r
	50	L0:\r
	51	mov rcx, rdx\r
	52	and edx, 15\r
	53	shr rcx, 4\r
	54	jz L_ZeroBytes\r
	55	pxor xmm0, xmm0\r
	56	L1:\r
	57	movntdq [rdi], xmm0 # rdi should be 16-byte aligned\r
	58	add rdi, 16\r
	59	loop L1\r
	60	mfence\r
	61	L_ZeroBytes:\r
	62	mov ecx, edx\r
	63	rep stosb\r
	64	mov rax, r8\r
	65	pop rdi\r
	66	ret\r