ArmPkg/Library/CompilerIntrinsicsLib/Arm/llsr.asm

   1 //------------------------------------------------------------------------------
   2 //
   3 // Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   4 // Copyright (c) 2018, Pete Batard. All rights reserved.<BR>
   5 //
   6 // SPDX-License-Identifier: BSD-2-Clause-Patent
   7 //
   8 //------------------------------------------------------------------------------
   9
  10   EXPORT  __aeabi_llsr
  11   EXPORT  __rt_srsh
  12
  13   AREA  s___aeabi_llsr, CODE, READONLY, ARM
  14
  15   ARM
  16
  17 ;
  18 ;VOID
  19 ;EFIAPI
  20 ;__aeabi_llsr (
  21 ;  IN  UINT64  Value,
  22 ;  IN  UINT32  Shift
  23 ;)
  24 ;
  25 __aeabi_llsr
  26 __rt_srsh
  27     SUBS     r3,r2,#0x20
  28     BPL      __aeabi_llsr_label1
  29     RSB      r3,r2,#0x20
  30     LSR      r0,r0,r2
  31     ORR      r0,r0,r1,LSL r3
  32     LSR      r1,r1,r2
  33     BX       lr
  34 __aeabi_llsr_label1
  35     LSR      r0,r1,r3
  36     MOV      r1,#0
  37     BX       lr
  38
  39     END