ArmPkg/Library/CompilerIntrinsicsLib/Arm/udivsi3.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   4 #
   5 # 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 ASM_PFX(__udivsi3)
  18
  19 ASM_PFX(__udivsi3):
  20         cmp     r1, #0
  21         cmpne   r0, #0
  22         stmfd   sp!, {r4, r5, r7, lr}
  23         add     r7, sp, #8
  24         beq     L2
  25         clz     r2, r1
  26         clz     r3, r0
  27         rsb     r3, r3, r2
  28         cmp     r3, #31
  29         bhi     L2
  30         ldmeqfd sp!, {r4, r5, r7, pc}
  31         add     r5, r3, #1
  32         rsb     r3, r3, #31
  33         mov     lr, #0
  34         mov     r2, r0, asl r3
  35         mov     ip, r0, lsr r5
  36         mov     r4, lr
  37         b       L8
  38 L9:
  39         mov     r0, r2, lsr #31
  40         orr     ip, r0, ip, asl #1
  41         orr     r2, r3, lr
  42         rsb     r3, ip, r1
  43         sub     r3, r3, #1
  44         and     r0, r1, r3, asr #31
  45         mov     lr, r3, lsr #31
  46         rsb     ip, r0, ip
  47         add     r4, r4, #1
  48 L8:
  49         cmp     r4, r5
  50         mov     r3, r2, asl #1
  51         bne     L9
  52         orr     r0, r3, lr
  53         ldmfd   sp!, {r4, r5, r7, pc}
  54 L2:
  55         mov     r0, #0
  56         ldmfd   sp!, {r4, r5, r7, pc}
  57