| /* |
| * Copyright (c) 2016, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. 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 www.aomedia.org/license/patent. |
| */ |
| |
| #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; |
| } |
| } |
| } |