| ; |
| ; 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 short_idct4x4_ppc |
| |
| .macro load_c V, LABEL, OFF, R0, R1 |
| lis \R0, \LABEL@ha |
| la \R1, \LABEL@l(\R0) |
| lvx \V, \OFF, \R1 |
| .endm |
| |
| ;# r3 short *input |
| ;# r4 short *output |
| ;# r5 int pitch |
| .align 2 |
| short_idct4x4_ppc: |
| mfspr r11, 256 ;# get old VRSAVE |
| oris r12, r11, 0xfff8 |
| mtspr 256, r12 ;# set VRSAVE |
| |
| load_c v8, sinpi8sqrt2, 0, r9, r10 |
| load_c v9, cospi8sqrt2minus1, 0, r9, r10 |
| load_c v10, hi_hi, 0, r9, r10 |
| load_c v11, lo_lo, 0, r9, r10 |
| load_c v12, shift_16, 0, r9, r10 |
| |
| li r10, 16 |
| lvx v0, 0, r3 ;# input ip[0], ip[ 4] |
| lvx v1, r10, r3 ;# input ip[8], ip[12] |
| |
| ;# first pass |
| vupkhsh v2, v0 |
| vupkhsh v3, v1 |
| vaddsws v6, v2, v3 ;# a1 = ip[0]+ip[8] |
| vsubsws v7, v2, v3 ;# b1 = ip[0]-ip[8] |
| |
| vupklsh v0, v0 |
| vmulosh v4, v0, v8 |
| vsraw v4, v4, v12 |
| vaddsws v4, v4, v0 ;# ip[ 4] * sin(pi/8) * sqrt(2) |
| |
| vupklsh v1, v1 |
| vmulosh v5, v1, v9 |
| vsraw v5, v5, v12 ;# ip[12] * cos(pi/8) * sqrt(2) |
| vaddsws v5, v5, v1 |
| |
| vsubsws v4, v4, v5 ;# c1 |
| |
| vmulosh v3, v1, v8 |
| vsraw v3, v3, v12 |
| vaddsws v3, v3, v1 ;# ip[12] * sin(pi/8) * sqrt(2) |
| |
| vmulosh v5, v0, v9 |
| vsraw v5, v5, v12 ;# ip[ 4] * cos(pi/8) * sqrt(2) |
| vaddsws v5, v5, v0 |
| |
| vaddsws v3, v3, v5 ;# d1 |
| |
| vaddsws v0, v6, v3 ;# a1 + d1 |
| vsubsws v3, v6, v3 ;# a1 - d1 |
| |
| vaddsws v1, v7, v4 ;# b1 + c1 |
| vsubsws v2, v7, v4 ;# b1 - c1 |
| |
| ;# transpose input |
| vmrghw v4, v0, v1 ;# a0 b0 a1 b1 |
| vmrghw v5, v2, v3 ;# c0 d0 c1 d1 |
| |
| vmrglw v6, v0, v1 ;# a2 b2 a3 b3 |
| vmrglw v7, v2, v3 ;# c2 d2 c3 d3 |
| |
| vperm v0, v4, v5, v10 ;# a0 b0 c0 d0 |
| vperm v1, v4, v5, v11 ;# a1 b1 c1 d1 |
| |
| vperm v2, v6, v7, v10 ;# a2 b2 c2 d2 |
| vperm v3, v6, v7, v11 ;# a3 b3 c3 d3 |
| |
| ;# second pass |
| vaddsws v6, v0, v2 ;# a1 = ip[0]+ip[8] |
| vsubsws v7, v0, v2 ;# b1 = ip[0]-ip[8] |
| |
| vmulosh v4, v1, v8 |
| vsraw v4, v4, v12 |
| vaddsws v4, v4, v1 ;# ip[ 4] * sin(pi/8) * sqrt(2) |
| |
| vmulosh v5, v3, v9 |
| vsraw v5, v5, v12 ;# ip[12] * cos(pi/8) * sqrt(2) |
| vaddsws v5, v5, v3 |
| |
| vsubsws v4, v4, v5 ;# c1 |
| |
| vmulosh v2, v3, v8 |
| vsraw v2, v2, v12 |
| vaddsws v2, v2, v3 ;# ip[12] * sin(pi/8) * sqrt(2) |
| |
| vmulosh v5, v1, v9 |
| vsraw v5, v5, v12 ;# ip[ 4] * cos(pi/8) * sqrt(2) |
| vaddsws v5, v5, v1 |
| |
| vaddsws v3, v2, v5 ;# d1 |
| |
| vaddsws v0, v6, v3 ;# a1 + d1 |
| vsubsws v3, v6, v3 ;# a1 - d1 |
| |
| vaddsws v1, v7, v4 ;# b1 + c1 |
| vsubsws v2, v7, v4 ;# b1 - c1 |
| |
| vspltish v6, 4 |
| vspltish v7, 3 |
| |
| vpkswss v0, v0, v1 |
| vpkswss v1, v2, v3 |
| |
| vaddshs v0, v0, v6 |
| vaddshs v1, v1, v6 |
| |
| vsrah v0, v0, v7 |
| vsrah v1, v1, v7 |
| |
| ;# transpose output |
| vmrghh v2, v0, v1 ;# a0 c0 a1 c1 a2 c2 a3 c3 |
| vmrglh v3, v0, v1 ;# b0 d0 b1 d1 b2 d2 b3 d3 |
| |
| vmrghh v0, v2, v3 ;# a0 b0 c0 d0 a1 b1 c1 d1 |
| vmrglh v1, v2, v3 ;# a2 b2 c2 d2 a3 b3 c3 d3 |
| |
| stwu r1,-416(r1) ;# create space on the stack |
| |
| stvx v0, 0, r1 |
| lwz r6, 0(r1) |
| stw r6, 0(r4) |
| lwz r6, 4(r1) |
| stw r6, 4(r4) |
| |
| add r4, r4, r5 |
| |
| lwz r6, 8(r1) |
| stw r6, 0(r4) |
| lwz r6, 12(r1) |
| stw r6, 4(r4) |
| |
| add r4, r4, r5 |
| |
| stvx v1, 0, r1 |
| lwz r6, 0(r1) |
| stw r6, 0(r4) |
| lwz r6, 4(r1) |
| stw r6, 4(r4) |
| |
| add r4, r4, r5 |
| |
| lwz r6, 8(r1) |
| stw r6, 0(r4) |
| lwz r6, 12(r1) |
| stw r6, 4(r4) |
| |
| addi r1, r1, 416 ;# recover stack |
| |
| mtspr 256, r11 ;# reset old VRSAVE |
| |
| blr |
| |
| .align 4 |
| sinpi8sqrt2: |
| .short 35468, 35468, 35468, 35468, 35468, 35468, 35468, 35468 |
| |
| .align 4 |
| cospi8sqrt2minus1: |
| .short 20091, 20091, 20091, 20091, 20091, 20091, 20091, 20091 |
| |
| .align 4 |
| shift_16: |
| .long 16, 16, 16, 16 |
| |
| .align 4 |
| hi_hi: |
| .byte 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 23 |
| |
| .align 4 |
| lo_lo: |
| .byte 8, 9, 10, 11, 12, 13, 14, 15, 24, 25, 26, 27, 28, 29, 30, 31 |
