ref: d9ca52452bff9481ec1ed4684985a86fb7fc3c3e
dir: /vp8/common/ppc/copy_altivec.asm/
; ; Copyright (c) 2010 The WebM project authors. All Rights Reserved. ; ; Use of this source code is governed by a BSD-style license ; that can be found in the LICENSE file in the root of the source ; tree. An additional intellectual property rights grant can be found ; in the file PATENTS. All contributing project authors may ; be found in the AUTHORS file in the root of the source tree. ; .globl copy_mem16x16_ppc ;# r3 unsigned char *src ;# r4 int src_stride ;# r5 unsigned char *dst ;# r6 int dst_stride ;# Make the assumption that input will not be aligned, ;# but the output will be. So two reads and a perm ;# for the input, but only one store for the output. copy_mem16x16_ppc: mfspr r11, 256 ;# get old VRSAVE oris r12, r11, 0xe000 mtspr 256, r12 ;# set VRSAVE li r10, 16 mtctr r10 cp_16x16_loop: lvsl v0, 0, r3 ;# permutate value for alignment lvx v1, 0, r3 lvx v2, r10, r3 vperm v1, v1, v2, v0 stvx v1, 0, r5 add r3, r3, r4 ;# increment source pointer add r5, r5, r6 ;# increment destination pointer bdnz cp_16x16_loop mtspr 256, r11 ;# reset old VRSAVE blr