ref: b0d15713beb8559d76eee9bf5c86ab70edbcdff4
dir: /vpx_dsp/arm/subtract_neon.c/
/* * Copyright (c) 2014 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 <arm_neon.h> #include "./vpx_config.h" #include "vpx/vpx_integer.h" void vpx_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; } } }