ArmPkg/Library/CompilerIntrinsicsLib/Arm/llsr.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2013, ARM. All rights reserved.<BR>
   4 #
   5 # SPDX-License-Identifier: BSD-2-Clause-Patent
   6 #
   7 #------------------------------------------------------------------------------
   8
   9 #include <AsmMacroIoLib.h>
  10
  11 #VOID
  12 #EFIAPI
  13 #__aeabi_llsr (
  14 # IN  VOID    *Destination,
  15 # IN  VOID    *Source,
  16 # IN  UINT32  Size
  17 # );
  18 #
  19 ASM_FUNC(__aeabi_llsr)
  20     subs     r3,r2,#0x20
  21     bpl      1f
  22     rsb      r3,r2,#0x20
  23     lsr      r0,r0,r2
  24     orr      r0,r0,r1,lsl r3
  25     lsr      r1,r1,r2
  26     bx       lr
  27 1:
  28     lsr      r0,r1,r3
  29     mov      r1,#0
  30     bx       lr