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

#------------------------------------------------------------------------------
#
# Copyright (c) 2006, 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.asm
#
# Abstract:
#
#   CopyMem function
#
# Notes:
#
#------------------------------------------------------------------------------


#------------------------------------------------------------------------------
# VOID *
# EFIAPI
# InternalMemCopyMem (
#   OUT     VOID                      *DestinationBuffer,
#   IN      CONST VOID                *SourceBuffer,
#   IN      UINTN                     Length
#   );
#------------------------------------------------------------------------------
.global _InternalMemCopyMem;
_InternalMemCopyMem:
    push    %rsi
    push    %rdi
    mov     %rdi, %rsi
    mov     %rcx, %rdi
    lea     -1(%r8,%rsi,1),%r9
    cmp     %rdi, %rsi
    mov     %rdi, %rax
    jae     L1
    cmp     %rdi, %r9
    jae     LCopyBackward               # Copy backward if overlapped
L1: 
    mov     %r8, %rcx
    and     $7, %r8
    shr     $3, %rcx
    jz      LCopyBytes
    movd    %mm0, %r10                  # (Save mm0 in r10)
L2: 
    movd    (%rsi), %mm0
    movntq  %mm0, (%rdi)
    add     $8, %rsi
    add     $8, %rdi
    loop    L2
    mfence
    movd    %r10, %mm0                  #(Restore mm0)
    jmp     LCopyBytes
LCopyBackward: 
    mov     %r9, %rsi
    lea     -1(%r8,%rdi,1),%rdi
    std                                 # set direction flag
LCopyBytes: 
    mov     %r8, %rcx
    rep
    movsb                               # Copy bytes backward
    cld
    pop     %rdi
    pop     %rsi
    ret
Commit	Line	Data
02ad42ae	1	#------------------------------------------------------------------------------
	2	#
	3	# Copyright (c) 2006, Intel Corporation
	4	# All rights reserved. This program and the accompanying materials
	5	# are licensed and made available under the terms and conditions of the BSD License
	6	# which accompanies this distribution. The full text of the license may be found at
	7	# http://opensource.org/licenses/bsd-license.php
	8	#
	9	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	10	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
	11	#
	12	# Module Name:
	13	#
	14	# CopyMem.asm
	15	#
	16	# Abstract:
	17	#
	18	# CopyMem function
	19	#
	20	# Notes:
	21	#
	22	#------------------------------------------------------------------------------
	23
	24
	25	#------------------------------------------------------------------------------
	26	# VOID *
	27	# EFIAPI
	28	# InternalMemCopyMem (
	29	# OUT VOID *DestinationBuffer,
	30	# IN CONST VOID *SourceBuffer,
	31	# IN UINTN Length
	32	# );
	33	#------------------------------------------------------------------------------
	34	.global _InternalMemCopyMem;
	35	_InternalMemCopyMem:
	36	push %rsi
	37	push %rdi
	38	mov %rdi, %rsi
	39	mov %rcx, %rdi
	40	lea -1(%r8,%rsi,1),%r9
	41	cmp %rdi, %rsi
	42	mov %rdi, %rax
	43	jae L1
	44	cmp %rdi, %r9
	45	jae LCopyBackward # Copy backward if overlapped
	46	L1:
	47	mov %r8, %rcx
	48	and $7, %r8
	49	shr $3, %rcx
	50	jz LCopyBytes
	51	movd %mm0, %r10 # (Save mm0 in r10)
	52	L2:
	53	movd (%rsi), %mm0
	54	movntq %mm0, (%rdi)
	55	add $8, %rsi
	56	add $8, %rdi
	57	loop L2
	58	mfence
	59	movd %r10, %mm0 #(Restore mm0)
	60	jmp LCopyBytes
	61	LCopyBackward:
	62	mov %r9, %rsi
	63	lea -1(%r8,%rdi,1),%rdi
	64	std # set direction flag
65	LCopyBytes:
66	mov %r8, %rcx
67	rep
68	movsb # Copy bytes backward
69	cld
70	pop %rdi
71	pop %rsi
72	ret