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 // This program and the accompanying materials
   7 // are licensed and made available under the terms and conditions of the BSD License
   8 // which accompanies this distribution.  The full text of the license may be found at
   9 // http://opensource.org/licenses/bsd-license.php
  10 //
  11 // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13 //
  14 //------------------------------------------------------------------------------
  15
  16   EXPORT  __aeabi_llsr
  17   EXPORT  __rt_srsh
  18
  19   AREA  s___aeabi_llsr, CODE, READONLY, ARM
  20
  21   ARM
  22
  23 ;
  24 ;VOID
  25 ;EFIAPI
  26 ;__aeabi_llsr (
  27 ;  IN  UINT64  Value,
  28 ;  IN  UINT32  Shift
  29 ;)
  30 ;
  31 __aeabi_llsr
  32 __rt_srsh
  33     SUBS     r3,r2,#0x20
  34     BPL      __aeabi_llsr_label1
  35     RSB      r3,r2,#0x20
  36     LSR      r0,r0,r2
  37     ORR      r0,r0,r1,LSL r3
  38     LSR      r1,r1,r2
  39     BX       lr
  40 __aeabi_llsr_label1
  41     LSR      r0,r1,r3
  42     MOV      r1,#0
  43     BX       lr
  44
  45     END