libvpx: Pull from upstream

source/libvpx/vp8/encoder/ppc/rdopt_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_block_error_ppc
-
-    .align 2
-;# r3 short *Coeff
-;# r4 short *dqcoeff
-vp8_block_error_ppc:
-    mfspr   r11, 256            ;# get old VRSAVE
-    oris    r12, r11, 0xf800
-    mtspr   256, r12            ;# set VRSAVE
-
-    stwu    r1,-32(r1)          ;# create space on the stack
-
-    stw     r5, 12(r1)          ;# tranfer dc to vector register
-
-    lvx     v0, 0, r3           ;# Coeff
-    lvx     v1, 0, r4           ;# dqcoeff
-
-    li      r10, 16
-
-    vspltisw v3, 0
-
-    vsubshs v0, v0, v1
-
-    vmsumshm v2, v0, v0, v3     ;# multiply differences
-
-    lvx     v0, r10, r3         ;# Coeff
-    lvx     v1, r10, r4         ;# dqcoeff
-
-    vsubshs v0, v0, v1
-
-    vmsumshm v1, v0, v0, v2     ;# multiply differences
-    vsumsws v1, v1, v3          ;# sum up
-
-    stvx    v1, 0, r1
-    lwz     r3, 12(r1)          ;# return value
-
-    addi    r1, r1, 32          ;# recover stack
-    mtspr   256, r11            ;# reset old VRSAVE
-
-    blr