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/*
* Copyright (c) 2018 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 "./vpx_config.h"
#include "./vpx_dsp_rtcd.h"
#include "vpx/vpx_integer.h"
#include "vpx_dsp/ppc/types_vsx.h"
static VPX_FORCE_INLINE void subtract_block4x4(
int16_t *diff, ptrdiff_t diff_stride, const uint8_t *src,
ptrdiff_t src_stride, const uint8_t *pred, ptrdiff_t pred_stride) {
int16_t *diff1 = diff + 2 * diff_stride;
const uint8_t *src1 = src + 2 * src_stride;
const uint8_t *pred1 = pred + 2 * pred_stride;
const int16x8_t d0 = vec_vsx_ld(0, diff);
const int16x8_t d1 = vec_vsx_ld(0, diff + diff_stride);
const int16x8_t d2 = vec_vsx_ld(0, diff1);
const int16x8_t d3 = vec_vsx_ld(0, diff1 + diff_stride);
const uint8x16_t s0 = read4x2(src, (int)src_stride);
const uint8x16_t p0 = read4x2(pred, (int)pred_stride);
const uint8x16_t s1 = read4x2(src1, (int)src_stride);
const uint8x16_t p1 = read4x2(pred1, (int)pred_stride);
const int16x8_t da = vec_sub(unpack_to_s16_h(s0), unpack_to_s16_h(p0));
const int16x8_t db = vec_sub(unpack_to_s16_h(s1), unpack_to_s16_h(p1));
vec_vsx_st(xxpermdi(da, d0, 1), 0, diff);
vec_vsx_st(xxpermdi(da, d1, 3), 0, diff + diff_stride);
vec_vsx_st(xxpermdi(db, d2, 1), 0, diff1);
vec_vsx_st(xxpermdi(db, d3, 3), 0, diff1 + diff_stride);
}
void vpx_subtract_block_vsx(int rows, int cols, int16_t *diff,
ptrdiff_t diff_stride, const uint8_t *src,
ptrdiff_t src_stride, const uint8_t *pred,
ptrdiff_t pred_stride) {
int r = rows, c;
switch (cols) {
case 64:
case 32:
do {
for (c = 0; c < cols; c += 32) {
const uint8x16_t s0 = vec_vsx_ld(0, src + c);
const uint8x16_t s1 = vec_vsx_ld(16, src + c);
const uint8x16_t p0 = vec_vsx_ld(0, pred + c);
const uint8x16_t p1 = vec_vsx_ld(16, pred + c);
const int16x8_t d0l =
vec_sub(unpack_to_s16_l(s0), unpack_to_s16_l(p0));
const int16x8_t d0h =
vec_sub(unpack_to_s16_h(s0), unpack_to_s16_h(p0));
const int16x8_t d1l =
vec_sub(unpack_to_s16_l(s1), unpack_to_s16_l(p1));
const int16x8_t d1h =
vec_sub(unpack_to_s16_h(s1), unpack_to_s16_h(p1));
vec_vsx_st(d0h, 0, diff + c);
vec_vsx_st(d0l, 16, diff + c);
vec_vsx_st(d1h, 0, diff + c + 16);
vec_vsx_st(d1l, 16, diff + c + 16);
}
diff += diff_stride;
pred += pred_stride;
src += src_stride;
} while (--r);
break;
case 16:
do {
const uint8x16_t s0 = vec_vsx_ld(0, src);
const uint8x16_t p0 = vec_vsx_ld(0, pred);
const int16x8_t d0l = vec_sub(unpack_to_s16_l(s0), unpack_to_s16_l(p0));
const int16x8_t d0h = vec_sub(unpack_to_s16_h(s0), unpack_to_s16_h(p0));
vec_vsx_st(d0h, 0, diff);
vec_vsx_st(d0l, 16, diff);
diff += diff_stride;
pred += pred_stride;
src += src_stride;
} while (--r);
break;
case 8:
do {
const uint8x16_t s0 = vec_vsx_ld(0, src);
const uint8x16_t p0 = vec_vsx_ld(0, pred);
const int16x8_t d0h = vec_sub(unpack_to_s16_h(s0), unpack_to_s16_h(p0));
vec_vsx_st(d0h, 0, diff);
diff += diff_stride;
pred += pred_stride;
src += src_stride;
} while (--r);
break;
case 4:
subtract_block4x4(diff, diff_stride, src, src_stride, pred, pred_stride);
if (r > 4) {
diff += 4 * diff_stride;
pred += 4 * pred_stride;
src += 4 * src_stride;
subtract_block4x4(diff, diff_stride,
src, src_stride,
pred, pred_stride);
}
break;
default: assert(0); // unreachable
}
}
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