ref: 2040bb58fbec7d06d5bdb1f6628bb058d3132ebf
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