[mirror_edk2.git] / OldMdePkg / Library / BaseMemoryLibMmx / X64 / CompareMem.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:
#
#   CompareMem.Asm
#
# Abstract:
#
#   CompareMem function
#
# Notes:
#
#   The following BaseMemoryLib instances share the same version of this file:
#
#       BaseMemoryLibRepStr
#       BaseMemoryLibMmx
#       BaseMemoryLibSse2
#
#------------------------------------------------------------------------------

#------------------------------------------------------------------------------
# INTN
# EFIAPI
# InternalMemCompareMem (
#   IN      CONST VOID                *DestinationBuffer,
#   IN      CONST VOID                *SourceBuffer,
#   IN      UINTN                     Length
#   );
#------------------------------------------------------------------------------
.global _InternalMemCompareMem;
_InternalMemCompareMem:
    push    %rsi
    push    %rdi
    mov     %rcx, %rsi
    mov     %rdx, %rdi
    mov     %r8, %rcx
    repe    cmpsb
    movzbq  -1(%rsi), %rax
    movzbq  -1(%rdi), %rdx
    sub     %rdx, %rax
    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	# CompareMem.Asm
	15	#
	16	# Abstract:
	17	#
	18	# CompareMem function
	19	#
	20	# Notes:
	21	#
	22	# The following BaseMemoryLib instances share the same version of this file:
	23	#
	24	# BaseMemoryLibRepStr
	25	# BaseMemoryLibMmx
	26	# BaseMemoryLibSse2
	27	#
	28	#------------------------------------------------------------------------------
	29
	30	#------------------------------------------------------------------------------
	31	# INTN
	32	# EFIAPI
	33	# InternalMemCompareMem (
	34	# IN CONST VOID *DestinationBuffer,
	35	# IN CONST VOID *SourceBuffer,
	36	# IN UINTN Length
	37	# );
	38	#------------------------------------------------------------------------------
	39	.global _InternalMemCompareMem;
	40	_InternalMemCompareMem:
	41	push %rsi
	42	push %rdi
	43	mov %rcx, %rsi
	44	mov %rdx, %rdi
	45	mov %r8, %rcx
	46	repe cmpsb
	47	movzbq -1(%rsi), %rax
	48	movzbq -1(%rdi), %rdx
	49	sub %rdx, %rax
	50	pop %rdi
	51	pop %rsi
	52	ret