ArmPkg/Library/CompilerIntrinsicsLib/Arm/switchu8.S

   1 #/** @file
   2 #  Compiler intrinsic for ARM compiler
   3 #
   4 #  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   5 #  SPDX-License-Identifier: BSD-2-Clause-Patent
   6 #
   7 #**/
   8 #
   9
  10 #include <AsmMacroIoLib.h>
  11
  12 .syntax unified
  13
  14 ASM_FUNC(__switchu8)
  15     ldrb      ip,[lr,#-1]
  16     cmp       r0,ip
  17     ldrbcc    r0,[lr,r0]
  18     ldrbcs    r0,[lr,ip]
  19     add       ip,lr,r0,LSL #1
  20     bx        ip
  21