[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibMmx / X64 / CopyMem.S

#\r
# ConvertAsm.py: Automatically generated from CopyMem.asm\r
#\r
#------------------------------------------------------------------------------\r
#\r
# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r
# 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
#   CopyMem.S\r
#\r
# Abstract:\r
#\r
#   CopyMem function\r
#\r
# Notes:\r
#\r
#------------------------------------------------------------------------------\r
\r
\r
#------------------------------------------------------------------------------\r
#  VOID *\r
#  EFIAPI\r
#  InternalMemCopyMem (\r
#    IN VOID   *Destination,\r
#    IN VOID   *Source,\r
#    IN UINTN  Count\r
#    )\r
#------------------------------------------------------------------------------\r
ASM_GLOBAL ASM_PFX(InternalMemCopyMem)\r
ASM_PFX(InternalMemCopyMem):\r
    pushq   %rsi\r
    pushq   %rdi\r
    movq    %rdx, %rsi                  # rsi <- Source\r
    movq    %rcx, %rdi                  # rdi <- Destination\r
    leaq    -1(%rsi, %r8,), %r9         # r9 <- End of Source          \r
    cmpq    %rdi, %rsi \r
    movq    %rdi, %rax                  # rax <- Destination as return value\r
    jae     L0\r
    cmpq    %rdi, %r9\r
    jae     L_CopyBackward              # Copy backward if overlapped\r
L0:\r
    movq    %r8, %rcx \r
    andq    $7, %r8\r
    shrq    $3, %rcx                    # rcx <- # of Qwords to copy\r
    jz      L_CopyBytes\r
    movd    %mm0, %r10                  # (Save mm0 in r10)\r
L1:\r
    movq    (%rsi), %mm0\r
    movntq  %mm0, (%rdi)\r
    addq    $8, %rsi \r
    addq    $8, %rdi\r
    loop    L1\r
    mfence\r
    movd    %r10, %mm0                  # (Restore mm0)\r
    jmp     L_CopyBytes\r
L_CopyBackward:\r
    movq    %r9, %rsi                   # rsi <- End of Source\r
    leaq    -1(%rdi, %r8,), %rdi        # rdi <- End of Destination\r
    std                                 # set direction flag\r
L_CopyBytes:\r
    movq    %r8, %rcx \r
    rep     movsb                       # Copy bytes backward\r
    cld\r
    popq    %rdi\r
    popq    %rsi\r
    ret\r
Commit	Line	Data
	1	#\r
	2	# ConvertAsm.py: Automatically generated from CopyMem.asm\r
	3	#\r
	4	#------------------------------------------------------------------------------\r
	5	#\r
	6	# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r
	7	# 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	# CopyMem.S\r
	18	#\r
	19	# Abstract:\r
	20	#\r
	21	# CopyMem function\r
	22	#\r
	23	# Notes:\r
	24	#\r
	25	#------------------------------------------------------------------------------\r
	26	\r
	27	\r
	28	#------------------------------------------------------------------------------\r
	29	# VOID *\r
	30	# EFIAPI\r
	31	# InternalMemCopyMem (\r
	32	# IN VOID *Destination,\r
	33	# IN VOID *Source,\r
	34	# IN UINTN Count\r
	35	# )\r
	36	#------------------------------------------------------------------------------\r
	37	ASM_GLOBAL ASM_PFX(InternalMemCopyMem)\r
	38	ASM_PFX(InternalMemCopyMem):\r
	39	pushq %rsi\r
	40	pushq %rdi\r
	41	movq %rdx, %rsi # rsi <- Source\r
	42	movq %rcx, %rdi # rdi <- Destination\r
	43	leaq -1(%rsi, %r8,), %r9 # r9 <- End of Source \r
	44	cmpq %rdi, %rsi \r
	45	movq %rdi, %rax # rax <- Destination as return value\r
	46	jae L0\r
	47	cmpq %rdi, %r9\r
	48	jae L_CopyBackward # Copy backward if overlapped\r
	49	L0:\r
	50	movq %r8, %rcx \r
	51	andq $7, %r8\r
	52	shrq $3, %rcx # rcx <- # of Qwords to copy\r
	53	jz L_CopyBytes\r
	54	movd %mm0, %r10 # (Save mm0 in r10)\r
	55	L1:\r
	56	movq (%rsi), %mm0\r
	57	movntq %mm0, (%rdi)\r
	58	addq $8, %rsi \r
	59	addq $8, %rdi\r
	60	loop L1\r
	61	mfence\r
	62	movd %r10, %mm0 # (Restore mm0)\r
	63	jmp L_CopyBytes\r
	64	L_CopyBackward:\r
	65	movq %r9, %rsi # rsi <- End of Source\r
	66	leaq -1(%rdi, %r8,), %rdi # rdi <- End of Destination\r
	67	std # set direction flag\r
	68	L_CopyBytes:\r
	69	movq %r8, %rcx \r
	70	rep movsb # Copy bytes backward\r
	71	cld\r
	72	popq %rdi\r
	73	popq %rsi\r
	74	ret\r