[mirror_edk2.git] / ArmPkg / Library / CompilerIntrinsicsLib / Arm / switchu8.S

#/** @file
#  Compiler intrinsic for ARM compiler
#
#  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
#  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.;
#
#**/
#        

.text
.p2align 2

GCC_ASM_EXPORT(__switchu8)


ASM_PFX(__switchu8):
    ldrb      ip,[lr,#-1]
    cmp       r0,ip
    ldrccb    r0,[lr,r0]
    ldrcsb    r0,[lr,ip]
    add       ip,lr,r0,LSL #1
    bx        ip
Commit	Line	Data
2ef2b01e A	1	#/** @file
	2	# Compiler intrinsic for ARM compiler
	3	#
d6ebcab7 HT	4	# Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
d6ebcab7 HT	5	# This program and the accompanying materials
2ef2b01e A	6	# are licensed and made available under the terms and conditions of the BSD License
	7	# which accompanies this distribution. The full text of the license may be found at
	8	# http)://opensource.org/licenses/bsd-license.php
	9	#
	10	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	11	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.;
	12	#
	13	#**/
	14	#
	15
	16	.text
	17	.p2align 2
	18
1bfda055	19	GCC_ASM_EXPORT(__switchu8)
2ef2b01e A	20
	21
	22	ASM_PFX(__switchu8):
	23	ldrb ip,[lr,#-1]
98fc7c77	24	cmp r0,ip
	25	ldrccb r0,[lr,r0]
	26	ldrcsb r0,[lr,ip]
	27	add ip,lr,r0,LSL #1
2ef2b01e A	28	bx ip
2ef2b01e A	29