80 lines
3.0 KiB
C
80 lines
3.0 KiB
C
/*
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* Copyright (c) 2014 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <arm_neon.h>
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#include "./vpx_config.h"
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#include "vpx/vpx_integer.h"
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void vpx_subtract_block_neon(int rows, int cols, int16_t *diff,
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ptrdiff_t diff_stride, const uint8_t *src,
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ptrdiff_t src_stride, const uint8_t *pred,
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ptrdiff_t pred_stride) {
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int r, c;
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if (cols > 16) {
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for (r = 0; r < rows; ++r) {
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for (c = 0; c < cols; c += 32) {
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const uint8x16_t v_src_00 = vld1q_u8(&src[c + 0]);
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const uint8x16_t v_src_16 = vld1q_u8(&src[c + 16]);
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const uint8x16_t v_pred_00 = vld1q_u8(&pred[c + 0]);
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const uint8x16_t v_pred_16 = vld1q_u8(&pred[c + 16]);
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const uint16x8_t v_diff_lo_00 =
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vsubl_u8(vget_low_u8(v_src_00), vget_low_u8(v_pred_00));
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const uint16x8_t v_diff_hi_00 =
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vsubl_u8(vget_high_u8(v_src_00), vget_high_u8(v_pred_00));
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const uint16x8_t v_diff_lo_16 =
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vsubl_u8(vget_low_u8(v_src_16), vget_low_u8(v_pred_16));
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const uint16x8_t v_diff_hi_16 =
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vsubl_u8(vget_high_u8(v_src_16), vget_high_u8(v_pred_16));
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vst1q_s16(&diff[c + 0], vreinterpretq_s16_u16(v_diff_lo_00));
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vst1q_s16(&diff[c + 8], vreinterpretq_s16_u16(v_diff_hi_00));
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vst1q_s16(&diff[c + 16], vreinterpretq_s16_u16(v_diff_lo_16));
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vst1q_s16(&diff[c + 24], vreinterpretq_s16_u16(v_diff_hi_16));
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}
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diff += diff_stride;
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pred += pred_stride;
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src += src_stride;
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}
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} else if (cols > 8) {
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for (r = 0; r < rows; ++r) {
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const uint8x16_t v_src = vld1q_u8(&src[0]);
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const uint8x16_t v_pred = vld1q_u8(&pred[0]);
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const uint16x8_t v_diff_lo =
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vsubl_u8(vget_low_u8(v_src), vget_low_u8(v_pred));
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const uint16x8_t v_diff_hi =
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vsubl_u8(vget_high_u8(v_src), vget_high_u8(v_pred));
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vst1q_s16(&diff[0], vreinterpretq_s16_u16(v_diff_lo));
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vst1q_s16(&diff[8], vreinterpretq_s16_u16(v_diff_hi));
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diff += diff_stride;
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pred += pred_stride;
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src += src_stride;
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}
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} else if (cols > 4) {
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for (r = 0; r < rows; ++r) {
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const uint8x8_t v_src = vld1_u8(&src[0]);
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const uint8x8_t v_pred = vld1_u8(&pred[0]);
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const uint16x8_t v_diff = vsubl_u8(v_src, v_pred);
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vst1q_s16(&diff[0], vreinterpretq_s16_u16(v_diff));
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diff += diff_stride;
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pred += pred_stride;
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src += src_stride;
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}
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} else {
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for (r = 0; r < rows; ++r) {
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for (c = 0; c < cols; ++c) diff[c] = src[c] - pred[c];
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diff += diff_stride;
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pred += pred_stride;
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src += src_stride;
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}
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}
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}
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