audk/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.;
#
#**/
#

#include <AsmMacroIoLib.h>

.syntax unified

ASM_FUNC(__switchu8)
    ldrb      ip,[lr,#-1]
    cmp       r0,ip
    ldrbcc    r0,[lr,r0]
    ldrbcs    r0,[lr,ip]
    add       ip,lr,r0,LSL #1
    bx        ip