ref: b671491ad473436d74c7a54a7693efcb1484a23c
dir: /vp8/encoder/ppc/encodemb_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 vp8_subtract_mbuv_ppc
.globl vp8_subtract_mby_ppc
;# r3 short *diff
;# r4 unsigned char *usrc
;# r5 unsigned char *vsrc
;# r6 unsigned char *pred
;# r7 int stride
vp8_subtract_mbuv_ppc:
mfspr r11, 256 ;# get old VRSAVE
oris r12, r11, 0xf000
mtspr 256, r12 ;# set VRSAVE
li r9, 256
add r3, r3, r9
add r3, r3, r9
add r6, r6, r9
li r10, 16
li r9, 4
mtctr r9
vspltisw v0, 0
mbu_loop:
lvsl v5, 0, r4 ;# permutate value for alignment
lvx v1, 0, r4 ;# src
lvx v2, 0, r6 ;# pred
add r4, r4, r7
addi r6, r6, 16
vperm v1, v1, v0, v5
vmrghb v3, v0, v1 ;# unpack high src to short
vmrghb v4, v0, v2 ;# unpack high pred to short
lvsl v5, 0, r4 ;# permutate value for alignment
lvx v1, 0, r4 ;# src
add r4, r4, r7
vsubshs v3, v3, v4
stvx v3, 0, r3 ;# store out diff
vperm v1, v1, v0, v5
vmrghb v3, v0, v1 ;# unpack high src to short
vmrglb v4, v0, v2 ;# unpack high pred to short
vsubshs v3, v3, v4
stvx v3, r10, r3 ;# store out diff
addi r3, r3, 32
bdnz mbu_loop
mtctr r9
mbv_loop:
lvsl v5, 0, r5 ;# permutate value for alignment
lvx v1, 0, r5 ;# src
lvx v2, 0, r6 ;# pred
add r5, r5, r7
addi r6, r6, 16
vperm v1, v1, v0, v5
vmrghb v3, v0, v1 ;# unpack high src to short
vmrghb v4, v0, v2 ;# unpack high pred to short
lvsl v5, 0, r5 ;# permutate value for alignment
lvx v1, 0, r5 ;# src
add r5, r5, r7
vsubshs v3, v3, v4
stvx v3, 0, r3 ;# store out diff
vperm v1, v1, v0, v5
vmrghb v3, v0, v1 ;# unpack high src to short
vmrglb v4, v0, v2 ;# unpack high pred to short
vsubshs v3, v3, v4
stvx v3, r10, r3 ;# store out diff
addi r3, r3, 32
bdnz mbv_loop
mtspr 256, r11 ;# reset old VRSAVE
blr
;# r3 short *diff
;# r4 unsigned char *src
;# r5 unsigned char *pred
;# r6 int stride
vp8_subtract_mby_ppc:
mfspr r11, 256 ;# get old VRSAVE
oris r12, r11, 0xf800
mtspr 256, r12 ;# set VRSAVE
li r10, 16
mtctr r10
vspltisw v0, 0
mby_loop:
lvx v1, 0, r4 ;# src
lvx v2, 0, r5 ;# pred
add r4, r4, r6
addi r5, r5, 16
vmrghb v3, v0, v1 ;# unpack high src to short
vmrghb v4, v0, v2 ;# unpack high pred to short
vsubshs v3, v3, v4
stvx v3, 0, r3 ;# store out diff
vmrglb v3, v0, v1 ;# unpack low src to short
vmrglb v4, v0, v2 ;# unpack low pred to short
vsubshs v3, v3, v4
stvx v3, r10, r3 ;# store out diff
addi r3, r3, 32
bdnz mby_loop
mtspr 256, r11 ;# reset old VRSAVE
blr