ref: d8c277030ce6285fe37be232c6bc5dc9f96110e0
dir: /vpx_dsp/ppc/inv_txfm_vsx.c/
/*
* Copyright (c) 2015 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.
*/
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "vpx_dsp/ppc/types_vsx.h"
#include "./vpx_dsp_rtcd.h"
#include "vpx_dsp/inv_txfm.h"
static int16x8_t cospi8_v = { 15137, 15137, 15137, 15137,
15137, 15137, 15137, 15137 };
static int16x8_t cospi16_v = { 11585, 11585, 11585, 11585,
11585, 11585, 11585, 11585 };
static int16x8_t cospi24_v = { 6270, 6270, 6270, 6270, 6270, 6270, 6270, 6270 };
#define ROUND_SHIFT_INIT \
const int32x4_t shift = vec_sl(vec_splat_s32(1), vec_splat_u32(13)); \
const uint32x4_t shift14 = vec_splat_u32(14);
#define DCT_CONST_ROUND_SHIFT(vec) vec = vec_sra(vec_add(vec, shift), shift14);
#define PIXEL_ADD_INIT \
int16x8_t add8 = vec_splat_s16(8); \
uint16x8_t shift4 = vec_splat_u16(4);
#define PIXEL_ADD(out, in) out = vec_sra(vec_add(in, add8), shift4);
#define IDCT4(in0, in1, out0, out1) \
t0 = vec_add(in0, in1); \
t1 = vec_sub(in0, in1); \
tmp16_0 = vec_mergeh(t0, t1); \
temp1 = vec_sra(vec_add(vec_mule(tmp16_0, cospi16_v), shift), shift14); \
temp2 = vec_sra(vec_add(vec_mulo(tmp16_0, cospi16_v), shift), shift14); \
\
tmp16_0 = vec_mergel(in0, in1); \
temp3 = vec_sub(vec_mule(tmp16_0, cospi24_v), vec_mulo(tmp16_0, cospi8_v)); \
DCT_CONST_ROUND_SHIFT(temp3); \
temp4 = vec_add(vec_mule(tmp16_0, cospi8_v), vec_mulo(tmp16_0, cospi24_v)); \
DCT_CONST_ROUND_SHIFT(temp4); \
\
step0 = vec_packs(temp1, temp2); \
step1 = vec_packs(temp4, temp3); \
out0 = vec_add(step0, step1); \
out1 = vec_sub(step0, step1); \
out1 = vec_perm(out1, out1, mask0);
void vpx_idct4x4_16_add_vsx(const tran_low_t *input, uint8_t *dest,
int stride) {
int32x4_t temp1, temp2, temp3, temp4;
int16x8_t step0, step1, tmp16_0, tmp16_1, t_out0, t_out1;
uint8x16_t mask0 = { 0x8, 0x9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF,
0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7 };
uint8x16_t mask1 = { 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 };
int16x8_t v0 = vec_vsx_ld(0, input);
int16x8_t v1 = vec_vsx_ld(16, input);
int16x8_t t0 = vec_mergeh(v0, v1);
int16x8_t t1 = vec_mergel(v0, v1);
uint8x16_t dest0 = vec_vsx_ld(0, dest);
uint8x16_t dest1 = vec_vsx_ld(stride, dest);
uint8x16_t dest2 = vec_vsx_ld(2 * stride, dest);
uint8x16_t dest3 = vec_vsx_ld(3 * stride, dest);
uint8x16_t zerov = vec_splat_u8(0);
int16x8_t d_u0 = (int16x8_t)vec_mergeh(dest0, zerov);
int16x8_t d_u1 = (int16x8_t)vec_mergeh(dest1, zerov);
int16x8_t d_u2 = (int16x8_t)vec_mergeh(dest2, zerov);
int16x8_t d_u3 = (int16x8_t)vec_mergeh(dest3, zerov);
uint8x16_t output_v;
uint8_t tmp_dest[16];
ROUND_SHIFT_INIT
PIXEL_ADD_INIT;
v0 = vec_mergeh(t0, t1);
v1 = vec_mergel(t0, t1);
IDCT4(v0, v1, t_out0, t_out1);
// transpose
t0 = vec_mergeh(t_out0, t_out1);
t1 = vec_mergel(t_out0, t_out1);
v0 = vec_mergeh(t0, t1);
v1 = vec_mergel(t0, t1);
IDCT4(v0, v1, t_out0, t_out1);
PIXEL_ADD(v0, t_out0);
PIXEL_ADD(v1, t_out1);
tmp16_0 = vec_add(vec_perm(d_u0, d_u1, mask1), v0);
tmp16_1 = vec_add(vec_perm(d_u2, d_u3, mask1), v1);
output_v = vec_packsu(tmp16_0, tmp16_1);
vec_vsx_st(output_v, 0, tmp_dest);
for (int i = 0; i < 4; i++)
for (int j = 0; j < 4; j++) dest[j * stride + i] = tmp_dest[j * 4 + i];
}