ArmPkg/Library/CompilerIntrinsicsLib/Arm/clzsi2.S

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   3 # Copyright (c) 2008 - 2010, 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
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  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.
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  13 #------------------------------------------------------------------------------
  14
  15 \s\s.text
  16 \s\s.align 2
  17 \s\sGCC_ASM_EXPORT(__clzsi2)
  18
  19 ASM_PFX(__clzsi2):
  20 \s\s@ frame_needed = 1, uses_anonymous_args = 0
  21 \s\sstmfd\s\ssp!, {r7, lr}
  22 \s\sadd\s\sr7, sp, #0
  23 \s\smovs\s\sr3, r0, lsr #16
  24 \s\smovne\s\sr3, #16
  25 \s\smoveq\s\sr3, #0
  26 \s\smovne\s\sr9, #0
  27 \s\smoveq\s\sr9, #16
  28 \s\smov\s\sr3, r0, lsr r3
  29 \s\stst\s\sr3, #65280
  30 \s\smovne\s\sr0, #8
  31 \s\smoveq\s\sr0, #0
  32 \s\smovne\s\slr, #0
  33 \s\smoveq\s\slr, #8
  34 \s\smov\s\sr3, r3, lsr r0
  35 \s\stst\s\sr3, #240
  36 \s\smovne\s\sr0, #4
  37 \s\smoveq\s\sr0, #0
  38 \s\smovne\s\sip, #0
  39 \s\smoveq\s\sip, #4
  40 \s\smov\s\sr3, r3, lsr r0
  41 \s\stst\s\sr3, #12
  42 \s\smovne\s\sr0, #2
  43 \s\smoveq\s\sr0, #0
  44 \s\smovne\s\sr1, #0
  45 \s\smoveq\s\sr1, #2
  46 \s\smov\s\sr2, r3, lsr r0
  47 \s\sadd\s\sr3, lr, r9
  48 \s\sadd\s\sr0, r3, ip
  49 \s\sadd\s\sr1, r0, r1
  50 \s\smov\s\sr0, r2, lsr #1
  51 \s\seor\s\sr0, r0, #1
  52 \s\sands\s\sr0, r0, #1
  53 \s\smvnne\s\sr0, #0
  54 \s\srsb\s\sr3, r2, #2
  55 \s\sand\s\sr0, r0, r3
  56 \s\sadd\s\sr0, r1, r0
  57 \s\sldmfd\s\ssp!, {r7, pc}