ref: 9f36419bf21a5922ffc32c289e09dd9fa0eb4eb2
dir: /vpx_dsp/ppc/vpx_convolve_vsx.c/
/*
* Copyright (c) 2017 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 <assert.h>
#include <string.h>
#include "./vpx_dsp_rtcd.h"
#include "vpx_dsp/vpx_filter.h"
#include "vpx_dsp/ppc/types_vsx.h"
// TODO(lu_zero): unroll
static inline void copy_w16(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride, int32_t h) {
int i;
for (i = h; i--;) {
vec_vsx_st(vec_vsx_ld(0, src), 0, dst);
src += src_stride;
dst += dst_stride;
}
}
static inline void copy_w32(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride, int32_t h) {
int i;
for (i = h; i--;) {
vec_vsx_st(vec_vsx_ld(0, src), 0, dst);
vec_vsx_st(vec_vsx_ld(16, src), 16, dst);
src += src_stride;
dst += dst_stride;
}
}
static inline void copy_w64(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride, int32_t h) {
int i;
for (i = h; i--;) {
vec_vsx_st(vec_vsx_ld(0, src), 0, dst);
vec_vsx_st(vec_vsx_ld(16, src), 16, dst);
vec_vsx_st(vec_vsx_ld(32, src), 32, dst);
vec_vsx_st(vec_vsx_ld(48, src), 48, dst);
src += src_stride;
dst += dst_stride;
}
}
void vpx_convolve_copy_vsx(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *filter, int x0_q4, int x_step_q4,
int y0_q4, int32_t y_step_q4, int32_t w, int32_t h) {
(void)filter;
(void)x0_q4;
(void)x_step_q4;
(void)y0_q4;
(void)y_step_q4;
switch (w) {
case 16: {
copy_w16(src, src_stride, dst, dst_stride, h);
break;
}
case 32: {
copy_w32(src, src_stride, dst, dst_stride, h);
break;
}
case 64: {
copy_w64(src, src_stride, dst, dst_stride, h);
break;
}
default: {
int i;
for (i = h; i--;) {
memcpy(dst, src, w);
src += src_stride;
dst += dst_stride;
}
break;
}
}
}
static inline void avg_w16(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride, int32_t h) {
int i;
for (i = h; i--;) {
const uint8x16_t v = vec_avg(vec_vsx_ld(0, src), vec_vsx_ld(0, dst));
vec_vsx_st(v, 0, dst);
src += src_stride;
dst += dst_stride;
}
}
static inline void avg_w32(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride, int32_t h) {
int i;
for (i = h; i--;) {
const uint8x16_t v0 = vec_avg(vec_vsx_ld(0, src), vec_vsx_ld(0, dst));
const uint8x16_t v1 = vec_avg(vec_vsx_ld(16, src), vec_vsx_ld(16, dst));
vec_vsx_st(v0, 0, dst);
vec_vsx_st(v1, 16, dst);
src += src_stride;
dst += dst_stride;
}
}
static inline void avg_w64(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride, int32_t h) {
int i;
for (i = h; i--;) {
const uint8x16_t v0 = vec_avg(vec_vsx_ld(0, src), vec_vsx_ld(0, dst));
const uint8x16_t v1 = vec_avg(vec_vsx_ld(16, src), vec_vsx_ld(16, dst));
const uint8x16_t v2 = vec_avg(vec_vsx_ld(32, src), vec_vsx_ld(32, dst));
const uint8x16_t v3 = vec_avg(vec_vsx_ld(48, src), vec_vsx_ld(48, dst));
vec_vsx_st(v0, 0, dst);
vec_vsx_st(v1, 16, dst);
vec_vsx_st(v2, 32, dst);
vec_vsx_st(v3, 48, dst);
src += src_stride;
dst += dst_stride;
}
}
void vpx_convolve_avg_vsx(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *filter, int x0_q4, int x_step_q4,
int y0_q4, int32_t y_step_q4, int32_t w, int32_t h) {
switch (w) {
case 16: {
avg_w16(src, src_stride, dst, dst_stride, h);
break;
}
case 32: {
avg_w32(src, src_stride, dst, dst_stride, h);
break;
}
case 64: {
avg_w64(src, src_stride, dst, dst_stride, h);
break;
}
default: {
vpx_convolve_avg_c(src, src_stride, dst, dst_stride, filter, x0_q4,
x_step_q4, y0_q4, y_step_q4, w, h);
break;
}
}
}
static inline void convolve_line(uint8_t *dst, const int16x8_t s,
const int16x8_t f) {
const int32x4_t sum = vec_msum(s, f, vec_splat_s32(0));
const int32x4_t bias =
vec_sl(vec_splat_s32(1), vec_splat_u32(FILTER_BITS - 1));
const int32x4_t avg = vec_sr(vec_sums(sum, bias), vec_splat_u32(FILTER_BITS));
const uint8x16_t v = vec_splat(
vec_packsu(vec_pack(avg, vec_splat_s32(0)), vec_splat_s16(0)), 3);
vec_ste(v, 0, dst);
}
static inline void convolve_line_h(uint8_t *dst, const uint8_t *const src_x,
const int16_t *const x_filter) {
const int16x8_t s = unpack_to_s16_h(vec_vsx_ld(0, src_x));
const int16x8_t f = vec_vsx_ld(0, x_filter);
convolve_line(dst, s, f);
}
// TODO(lu_zero): Implement 8x8 and bigger block special cases
static inline void convolve_horiz(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *x_filters, int x0_q4,
int x_step_q4, int w, int h) {
int x, y;
src -= SUBPEL_TAPS / 2 - 1;
for (y = 0; y < h; ++y) {
int x_q4 = x0_q4;
for (x = 0; x < w; ++x) {
convolve_line_h(dst + x, &src[x_q4 >> SUBPEL_BITS],
x_filters[x_q4 & SUBPEL_MASK]);
x_q4 += x_step_q4;
}
src += src_stride;
dst += dst_stride;
}
}
static inline void convolve_avg_horiz(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *x_filters, int x0_q4,
int x_step_q4, int w, int h) {
int x, y;
src -= SUBPEL_TAPS / 2 - 1;
for (y = 0; y < h; ++y) {
int x_q4 = x0_q4;
for (x = 0; x < w; ++x) {
uint8_t v;
convolve_line_h(&v, &src[x_q4 >> SUBPEL_BITS],
x_filters[x_q4 & SUBPEL_MASK]);
dst[x] = ROUND_POWER_OF_TWO(dst[x] + v, 1);
x_q4 += x_step_q4;
}
src += src_stride;
dst += dst_stride;
}
}
static uint8x16_t transpose_line_u8_8x8(uint8x16_t a, uint8x16_t b,
uint8x16_t c, uint8x16_t d,
uint8x16_t e, uint8x16_t f,
uint8x16_t g, uint8x16_t h) {
uint16x8_t ab = (uint16x8_t)vec_mergeh(a, b);
uint16x8_t cd = (uint16x8_t)vec_mergeh(c, d);
uint16x8_t ef = (uint16x8_t)vec_mergeh(e, f);
uint16x8_t gh = (uint16x8_t)vec_mergeh(g, h);
uint32x4_t abcd = (uint32x4_t)vec_mergeh(ab, cd);
uint32x4_t efgh = (uint32x4_t)vec_mergeh(ef, gh);
return (uint8x16_t)vec_mergeh(abcd, efgh);
}
static inline void convolve_line_v(uint8_t *dst, const uint8_t *const src_y,
ptrdiff_t src_stride,
const int16_t *const y_filter) {
uint8x16_t s0 = vec_vsx_ld(0, src_y + 0 * src_stride);
uint8x16_t s1 = vec_vsx_ld(0, src_y + 1 * src_stride);
uint8x16_t s2 = vec_vsx_ld(0, src_y + 2 * src_stride);
uint8x16_t s3 = vec_vsx_ld(0, src_y + 3 * src_stride);
uint8x16_t s4 = vec_vsx_ld(0, src_y + 4 * src_stride);
uint8x16_t s5 = vec_vsx_ld(0, src_y + 5 * src_stride);
uint8x16_t s6 = vec_vsx_ld(0, src_y + 6 * src_stride);
uint8x16_t s7 = vec_vsx_ld(0, src_y + 7 * src_stride);
const int16x8_t f = vec_vsx_ld(0, y_filter);
uint8_t buf[16];
const uint8x16_t s = transpose_line_u8_8x8(s0, s1, s2, s3, s4, s5, s6, s7);
vec_vsx_st(s, 0, buf);
convolve_line(dst, unpack_to_s16_h(s), f);
}
static inline void convolve_vert(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *y_filters, int y0_q4,
int y_step_q4, int w, int h) {
int x, y;
src -= src_stride * (SUBPEL_TAPS / 2 - 1);
for (x = 0; x < w; ++x) {
int y_q4 = y0_q4;
for (y = 0; y < h; ++y) {
convolve_line_v(dst + y * dst_stride,
&src[(y_q4 >> SUBPEL_BITS) * src_stride], src_stride,
y_filters[y_q4 & SUBPEL_MASK]);
y_q4 += y_step_q4;
}
++src;
++dst;
}
}
static inline void convolve_avg_vert(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *y_filters, int y0_q4,
int y_step_q4, int w, int h) {
int x, y;
src -= src_stride * (SUBPEL_TAPS / 2 - 1);
for (x = 0; x < w; ++x) {
int y_q4 = y0_q4;
for (y = 0; y < h; ++y) {
uint8_t v;
convolve_line_v(&v, &src[(y_q4 >> SUBPEL_BITS) * src_stride], src_stride,
y_filters[y_q4 & SUBPEL_MASK]);
dst[y * dst_stride] = ROUND_POWER_OF_TWO(dst[y * dst_stride] + v, 1);
y_q4 += y_step_q4;
}
++src;
++dst;
}
}
static inline void convolve(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *const filter, int x0_q4,
int x_step_q4, int y0_q4, int y_step_q4, int w,
int h) {
// Note: Fixed size intermediate buffer, temp, places limits on parameters.
// 2d filtering proceeds in 2 steps:
// (1) Interpolate horizontally into an intermediate buffer, temp.
// (2) Interpolate temp vertically to derive the sub-pixel result.
// Deriving the maximum number of rows in the temp buffer (135):
// --Smallest scaling factor is x1/2 ==> y_step_q4 = 32 (Normative).
// --Largest block size is 64x64 pixels.
// --64 rows in the downscaled frame span a distance of (64 - 1) * 32 in the
// original frame (in 1/16th pixel units).
// --Must round-up because block may be located at sub-pixel position.
// --Require an additional SUBPEL_TAPS rows for the 8-tap filter tails.
// --((64 - 1) * 32 + 15) >> 4 + 8 = 135.
DECLARE_ALIGNED(16, uint8_t, temp[64 * 135]);
const int intermediate_height =
(((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS;
assert(w <= 64);
assert(h <= 64);
assert(y_step_q4 <= 32);
assert(x_step_q4 <= 32);
convolve_horiz(src - src_stride * (SUBPEL_TAPS / 2 - 1), src_stride, temp, 64,
filter, x0_q4, x_step_q4, w, intermediate_height);
convolve_vert(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst, dst_stride, filter,
y0_q4, y_step_q4, w, h);
}
void vpx_convolve8_horiz_vsx(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *filter, int x0_q4,
int x_step_q4, int y0_q4, int y_step_q4, int w,
int h) {
(void)y0_q4;
(void)y_step_q4;
convolve_horiz(src, src_stride, dst, dst_stride, filter, x0_q4, x_step_q4, w,
h);
}
void vpx_convolve8_avg_horiz_vsx(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *filter, int x0_q4,
int x_step_q4, int y0_q4, int y_step_q4, int w,
int h) {
(void)y0_q4;
(void)y_step_q4;
convolve_avg_horiz(src, src_stride, dst, dst_stride, filter, x0_q4, x_step_q4,
w, h);
}
void vpx_convolve8_vert_vsx(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *filter, int x0_q4,
int x_step_q4, int y0_q4, int y_step_q4, int w,
int h) {
(void)x0_q4;
(void)x_step_q4;
convolve_vert(src, src_stride, dst, dst_stride, filter, y0_q4, y_step_q4, w,
h);
}
void vpx_convolve8_avg_vert_vsx(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *filter, int x0_q4,
int x_step_q4, int y0_q4, int y_step_q4, int w,
int h) {
(void)x0_q4;
(void)x_step_q4;
convolve_avg_vert(src, src_stride, dst, dst_stride, filter, y0_q4, y_step_q4,
w, h);
}
void vpx_convolve8_vsx(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst,
ptrdiff_t dst_stride, const InterpKernel *filter,
int x0_q4, int x_step_q4, int y0_q4, int y_step_q4,
int w, int h) {
convolve(src, src_stride, dst, dst_stride, filter, x0_q4, x_step_q4, y0_q4,
y_step_q4, w, h);
}
void vpx_convolve8_avg_vsx(const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *filter, int x0_q4, int x_step_q4,
int y0_q4, int y_step_q4, int w, int h) {
// Fixed size intermediate buffer places limits on parameters.
DECLARE_ALIGNED(16, uint8_t, temp[64 * 64]);
assert(w <= 64);
assert(h <= 64);
vpx_convolve8_vsx(src, src_stride, temp, 64, filter, x0_q4, x_step_q4, y0_q4,
y_step_q4, w, h);
vpx_convolve_avg_vsx(temp, 64, dst, dst_stride, NULL, 0, 0, 0, 0, w, h);
}