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/*
* Copyright (c) 2021, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 3-Clause Clear License
* and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
* License was not distributed with this source code in the LICENSE file, you
* can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. If the
* Alliance for Open Media Patent License 1.0 was not distributed with this
* source code in the PATENTS file, you can obtain it at
* aomedia.org/license/patent-license/.
*/
#include <arm_neon.h>
#include "config/aom_config.h"
#include "aom/aom_integer.h"
void aom_subtract_block_neon(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, c;
if (cols > 16) {
for (r = 0; r < rows; ++r) {
for (c = 0; c < cols; c += 32) {
const uint8x16_t v_src_00 = vld1q_u8(&src[c + 0]);
const uint8x16_t v_src_16 = vld1q_u8(&src[c + 16]);
const uint8x16_t v_pred_00 = vld1q_u8(&pred[c + 0]);
const uint8x16_t v_pred_16 = vld1q_u8(&pred[c + 16]);
const uint16x8_t v_diff_lo_00 =
vsubl_u8(vget_low_u8(v_src_00), vget_low_u8(v_pred_00));
const uint16x8_t v_diff_hi_00 =
vsubl_u8(vget_high_u8(v_src_00), vget_high_u8(v_pred_00));
const uint16x8_t v_diff_lo_16 =
vsubl_u8(vget_low_u8(v_src_16), vget_low_u8(v_pred_16));
const uint16x8_t v_diff_hi_16 =
vsubl_u8(vget_high_u8(v_src_16), vget_high_u8(v_pred_16));
vst1q_s16(&diff[c + 0], vreinterpretq_s16_u16(v_diff_lo_00));
vst1q_s16(&diff[c + 8], vreinterpretq_s16_u16(v_diff_hi_00));
vst1q_s16(&diff[c + 16], vreinterpretq_s16_u16(v_diff_lo_16));
vst1q_s16(&diff[c + 24], vreinterpretq_s16_u16(v_diff_hi_16));
}
diff += diff_stride;
pred += pred_stride;
src += src_stride;
}
} else if (cols > 8) {
for (r = 0; r < rows; ++r) {
const uint8x16_t v_src = vld1q_u8(&src[0]);
const uint8x16_t v_pred = vld1q_u8(&pred[0]);
const uint16x8_t v_diff_lo =
vsubl_u8(vget_low_u8(v_src), vget_low_u8(v_pred));
const uint16x8_t v_diff_hi =
vsubl_u8(vget_high_u8(v_src), vget_high_u8(v_pred));
vst1q_s16(&diff[0], vreinterpretq_s16_u16(v_diff_lo));
vst1q_s16(&diff[8], vreinterpretq_s16_u16(v_diff_hi));
diff += diff_stride;
pred += pred_stride;
src += src_stride;
}
} else if (cols > 4) {
for (r = 0; r < rows; ++r) {
const uint8x8_t v_src = vld1_u8(&src[0]);
const uint8x8_t v_pred = vld1_u8(&pred[0]);
const uint16x8_t v_diff = vsubl_u8(v_src, v_pred);
vst1q_s16(&diff[0], vreinterpretq_s16_u16(v_diff));
diff += diff_stride;
pred += pred_stride;
src += src_stride;
}
} else {
for (r = 0; r < rows; ++r) {
for (c = 0; c < cols; ++c) diff[c] = src[c] - pred[c];
diff += diff_stride;
pred += pred_stride;
src += src_stride;
}
}
}