audk/ArmPkg/Library/CompilerIntrinsicsLib/Arm/switchu8.S

30 lines
774 B
ArmAsm

#/** @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