vp8/encoder/ppc/rdopt_altivec.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     .globl vp8_block_error_ppc
  13
  14     .align 2
  15 ;# r3 short *Coeff
  16 ;# r4 short *dqcoeff
  17 vp8_block_error_ppc:
  18     mfspr   r11, 256            ;# get old VRSAVE
  19     oris    r12, r11, 0xf800
  20     mtspr   256, r12            ;# set VRSAVE
  21
  22     stwu    r1,-32(r1)          ;# create space on the stack
  23
  24     stw     r5, 12(r1)          ;# tranfer dc to vector register
  25
  26     lvx     v0, 0, r3           ;# Coeff
  27     lvx     v1, 0, r4           ;# dqcoeff
  28
  29     li      r10, 16
  30
  31     vspltisw v3, 0
  32
  33     vsubshs v0, v0, v1
  34
  35     vmsumshm v2, v0, v0, v3     ;# multiply differences
  36
  37     lvx     v0, r10, r3         ;# Coeff
  38     lvx     v1, r10, r4         ;# dqcoeff
  39
  40     vsubshs v0, v0, v1
  41
  42     vmsumshm v1, v0, v0, v2     ;# multiply differences
  43     vsumsws v1, v1, v3          ;# sum up
  44
  45     stvx    v1, 0, r1
  46     lwz     r3, 12(r1)          ;# return value
  47
  48     addi    r1, r1, 32          ;# recover stack
  49     mtspr   256, r11            ;# reset old VRSAVE
  50
  51     blr