ArmPkg/Library/CompilerIntrinsicsLib/Arm/udivsi3.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2008-2009 Apple Inc. All rights reserved.
   4 #
   5 # All rights reserved. This program and the accompanying materials
   6 # are licensed and made available under the terms and conditions of the BSD License
   7 # which accompanies this distribution.  The full text of the license may be found at
   8 # http://opensource.org/licenses/bsd-license.php
   9 #
  10 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 #
  13 #------------------------------------------------------------------------------
  14
  15         .text
  16         .align 2
  17         .globl ___udivsi3
  18 ___udivsi3:
  19         @ args = 0, pretend = 0, frame = 0
  20         @ frame_needed = 1, uses_anonymous_args = 0
  21         cmp     r1, #0
  22         cmpne   r0, #0
  23         stmfd   sp!, {r4, r5, r7, lr}
  24         add     r7, sp, #8
  25         beq     L2
  26         clz     r2, r1
  27         clz     r3, r0
  28         rsb     r3, r3, r2
  29         cmp     r3, #31
  30         bhi     L2
  31         ldmeqfd sp!, {r4, r5, r7, pc}
  32         add     r5, r3, #1
  33         rsb     r3, r3, #31
  34         mov     lr, #0
  35         mov     r2, r0, asl r3
  36         mov     ip, r0, lsr r5
  37         mov     r4, lr
  38         b       L8
  39 L9:
  40         mov     r0, r2, lsr #31
  41         orr     ip, r0, ip, asl #1
  42         orr     r2, r3, lr
  43         rsb     r3, ip, r1
  44         sub     r3, r3, #1
  45         and     r0, r1, r3, asr #31
  46         mov     lr, r3, lsr #31
  47         rsb     ip, r0, ip
  48         add     r4, r4, #1
  49 L8:
  50         cmp     r4, r5
  51         mov     r3, r2, asl #1
  52         bne     L9
  53         orr     r0, r3, lr
  54         ldmfd   sp!, {r4, r5, r7, pc}
  55 L2:
  56         mov     r0, #0
  57         ldmfd   sp!, {r4, r5, r7, pc}