ArmPkg/Library/CompilerIntrinsicsLib/Arm/udivsi3.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   4 #
   5 # SPDX-License-Identifier: BSD-2-Clause-Patent
   6 #
   7 #------------------------------------------------------------------------------
   8
   9 #include <AsmMacroIoLib.h>
  10
  11   .syntax unified
  12
  13 ASM_FUNC(__udivsi3)
  14   cmp  r1, #0
  15   cmpne  r0, #0
  16   stmfd  sp!, {r4, r5, r7, lr}
  17   add  r7, sp, #8
  18   beq  L2
  19   clz  r2, r1
  20   clz  r3, r0
  21   rsb  r3, r3, r2
  22   cmp  r3, #31
  23   bhi  L2
  24   ldmfdeq  sp!, {r4, r5, r7, pc}
  25   add  r5, r3, #1
  26   rsb  r3, r3, #31
  27   mov  lr, #0
  28   mov  r2, r0, asl r3
  29   mov  ip, r0, lsr r5
  30   mov  r4, lr
  31   b  L8
  32 L9:
  33   mov  r0, r2, lsr #31
  34   orr  ip, r0, ip, asl #1
  35   orr  r2, r3, lr
  36   rsb  r3, ip, r1
  37   sub  r3, r3, #1
  38   and  r0, r1, r3, asr #31
  39   mov  lr, r3, lsr #31
  40   rsb  ip, r0, ip
  41   add  r4, r4, #1
  42 L8:
  43   cmp  r4, r5
  44   mov  r3, r2, asl #1
  45   bne  L9
  46   orr  r0, r3, lr
  47   ldmfd  sp!, {r4, r5, r7, pc}
  48 L2:
  49   mov  r0, #0
  50   ldmfd  sp!, {r4, r5, r7, pc}
  51