vp8/decoder/arm/armv5/dequantize_v5.asm

   1 ;
   2 ;  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   3 ;
   4 ;  Use of this source code is governed by a BSD-style license
   5 ;  that can be found in the LICENSE file in the root of the source
   6 ;  tree. An additional intellectual property rights grant can be found
   7 ;  in the file PATENTS.  All contributing project authors may
   8 ;  be found in the AUTHORS file in the root of the source tree.
   9 ;
  10
  11
  12     EXPORT  |vp8_dequantize_b_armv5|
  13
  14     AREA    |.text|, CODE, READONLY  ; name this block of code
  15
  16 q       RN  r0
  17 dqc     RN  r1
  18 cnt     RN  r2
  19
  20 ;void dequantize_b_armv5(short *Q, short *DQC)
  21 |vp8_dequantize_b_armv5| PROC
  22     stmdb   sp!, {r4, lr}
  23     ldr     r3, [q]
  24     ldr     r4, [dqc], #8
  25
  26     mov     cnt, #4
  27 dequant_loop
  28     smulbb  lr, r3, r4
  29     smultt  r12, r3, r4
  30
  31     ldr     r3, [q, #4]
  32     ldr     r4, [dqc, #-4]
  33
  34     strh    lr, [q], #2
  35     strh    r12, [q], #2
  36
  37     smulbb  lr, r3, r4
  38     smultt  r12, r3, r4
  39
  40     subs    cnt, cnt, #1
  41     ldrne   r3, [q, #4]
  42     ldrne   r4, [dqc], #8
  43
  44     strh    lr, [q], #2
  45     strh    r12, [q], #2
  46
  47     bne     dequant_loop
  48
  49     ldmia   sp!, {r4, pc}
  50     ENDP    ;|vp8_dequantize_b_arm|
  51
  52     END