ref: 69e9a3949870cdc3e18b93a4451867c18a3cf8fc
dir: /vpx_dsp/arm/subpel_variance_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_dsp_rtcd.h" #include "./vpx_config.h" #include "vpx/vpx_integer.h" #include "vpx_dsp/variance.h" #include "vpx_dsp/arm/mem_neon.h" static const uint8_t bilinear_filters[8][2] = { { 128, 0 }, { 112, 16 }, { 96, 32 }, { 80, 48 }, { 64, 64 }, { 48, 80 }, { 32, 96 }, { 16, 112 }, }; // Process a block exactly 4 wide and a multiple of 2 high. static void var_filter_block2d_bil_w4(const uint8_t *src_ptr, uint8_t *output_ptr, unsigned int src_pixels_per_line, int pixel_step, unsigned int output_height, const uint8_t *filter) { const uint8x8_t f0 = vdup_n_u8(filter[0]); const uint8x8_t f1 = vdup_n_u8(filter[1]); unsigned int i; for (i = 0; i < output_height; i += 2) { const uint8x8_t src_0 = load_unaligned_u8(src_ptr, src_pixels_per_line); const uint8x8_t src_1 = load_unaligned_u8(src_ptr + pixel_step, src_pixels_per_line); const uint16x8_t a = vmull_u8(src_0, f0); const uint16x8_t b = vmlal_u8(a, src_1, f1); const uint8x8_t out = vrshrn_n_u16(b, FILTER_BITS); vst1_u8(output_ptr, out); src_ptr += 2 * src_pixels_per_line; output_ptr += 8; } } // Process a block exactly 8 wide and any height. static void var_filter_block2d_bil_w8(const uint8_t *src_ptr, uint8_t *output_ptr, unsigned int src_pixels_per_line, int pixel_step, unsigned int output_height, const uint8_t *filter) { const uint8x8_t f0 = vdup_n_u8(filter[0]); const uint8x8_t f1 = vdup_n_u8(filter[1]); unsigned int i; for (i = 0; i < output_height; ++i) { const uint8x8_t src_0 = vld1_u8(&src_ptr[0]); const uint8x8_t src_1 = vld1_u8(&src_ptr[pixel_step]); const uint16x8_t a = vmull_u8(src_0, f0); const uint16x8_t b = vmlal_u8(a, src_1, f1); const uint8x8_t out = vrshrn_n_u16(b, FILTER_BITS); vst1_u8(output_ptr, out); src_ptr += src_pixels_per_line; output_ptr += 8; } } // Process a block which is a mutiple of 16 wide and any height. static void var_filter_block2d_bil_w16(const uint8_t *src_ptr, uint8_t *output_ptr, unsigned int src_pixels_per_line, int pixel_step, unsigned int output_height, unsigned int output_width, const uint8_t *filter) { const uint8x8_t f0 = vdup_n_u8(filter[0]); const uint8x8_t f1 = vdup_n_u8(filter[1]); unsigned int i, j; for (i = 0; i < output_height; ++i) { for (j = 0; j < output_width; j += 16) { const uint8x16_t src_0 = vld1q_u8(&src_ptr[j]); const uint8x16_t src_1 = vld1q_u8(&src_ptr[j + pixel_step]); const uint16x8_t a = vmull_u8(vget_low_u8(src_0), f0); const uint16x8_t b = vmlal_u8(a, vget_low_u8(src_1), f1); const uint8x8_t out_lo = vrshrn_n_u16(b, FILTER_BITS); const uint16x8_t c = vmull_u8(vget_high_u8(src_0), f0); const uint16x8_t d = vmlal_u8(c, vget_high_u8(src_1), f1); const uint8x8_t out_hi = vrshrn_n_u16(d, FILTER_BITS); vst1q_u8(output_ptr + j, vcombine_u8(out_lo, out_hi)); } src_ptr += src_pixels_per_line; output_ptr += output_width; } } // 4xM filter writes an extra row to fdata because it processes two rows at a // time. #define sub_pixel_varianceNxM(n, m) \ uint32_t vpx_sub_pixel_variance##n##x##m##_neon( \ const uint8_t *a, int a_stride, int xoffset, int yoffset, \ const uint8_t *b, int b_stride, uint32_t *sse) { \ uint8_t temp0[n * (m + (n == 4 ? 2 : 1))]; \ uint8_t temp1[n * m]; \ \ if (n == 4) { \ var_filter_block2d_bil_w4(a, temp0, a_stride, 1, (m + 2), \ bilinear_filters[xoffset]); \ var_filter_block2d_bil_w4(temp0, temp1, n, n, m, \ bilinear_filters[yoffset]); \ } else if (n == 8) { \ var_filter_block2d_bil_w8(a, temp0, a_stride, 1, (m + 1), \ bilinear_filters[xoffset]); \ var_filter_block2d_bil_w8(temp0, temp1, n, n, m, \ bilinear_filters[yoffset]); \ } else { \ var_filter_block2d_bil_w16(a, temp0, a_stride, 1, (m + 1), n, \ bilinear_filters[xoffset]); \ var_filter_block2d_bil_w16(temp0, temp1, n, n, m, n, \ bilinear_filters[yoffset]); \ } \ return vpx_variance##n##x##m(temp1, n, b, b_stride, sse); \ } sub_pixel_varianceNxM(4, 4); sub_pixel_varianceNxM(4, 8); sub_pixel_varianceNxM(8, 4); sub_pixel_varianceNxM(8, 8); sub_pixel_varianceNxM(8, 16); sub_pixel_varianceNxM(16, 8); sub_pixel_varianceNxM(16, 16); sub_pixel_varianceNxM(16, 32); sub_pixel_varianceNxM(32, 16); sub_pixel_varianceNxM(32, 32); sub_pixel_varianceNxM(32, 64); sub_pixel_varianceNxM(64, 32); sub_pixel_varianceNxM(64, 64); // 4xM filter writes an extra row to fdata because it processes two rows at a // time. #define sub_pixel_avg_varianceNxM(n, m) \ uint32_t vpx_sub_pixel_avg_variance##n##x##m##_neon( \ const uint8_t *a, int a_stride, int xoffset, int yoffset, \ const uint8_t *b, int b_stride, uint32_t *sse, \ const uint8_t *second_pred) { \ uint8_t temp0[n * (m + (n == 4 ? 2 : 1))]; \ uint8_t temp1[n * m]; \ \ if (n == 4) { \ var_filter_block2d_bil_w4(a, temp0, a_stride, 1, (m + 2), \ bilinear_filters[xoffset]); \ var_filter_block2d_bil_w4(temp0, temp1, n, n, m, \ bilinear_filters[yoffset]); \ } else if (n == 8) { \ var_filter_block2d_bil_w8(a, temp0, a_stride, 1, (m + 1), \ bilinear_filters[xoffset]); \ var_filter_block2d_bil_w8(temp0, temp1, n, n, m, \ bilinear_filters[yoffset]); \ } else { \ var_filter_block2d_bil_w16(a, temp0, a_stride, 1, (m + 1), n, \ bilinear_filters[xoffset]); \ var_filter_block2d_bil_w16(temp0, temp1, n, n, m, n, \ bilinear_filters[yoffset]); \ } \ \ vpx_comp_avg_pred(temp0, second_pred, n, m, temp1, n); \ \ return vpx_variance##n##x##m(temp0, n, b, b_stride, sse); \ } sub_pixel_avg_varianceNxM(4, 4); sub_pixel_avg_varianceNxM(4, 8); sub_pixel_avg_varianceNxM(8, 4); sub_pixel_avg_varianceNxM(8, 8); sub_pixel_avg_varianceNxM(8, 16); sub_pixel_avg_varianceNxM(16, 8); sub_pixel_avg_varianceNxM(16, 16); sub_pixel_avg_varianceNxM(16, 32); sub_pixel_avg_varianceNxM(32, 16); sub_pixel_avg_varianceNxM(32, 32); sub_pixel_avg_varianceNxM(32, 64); sub_pixel_avg_varianceNxM(64, 32); sub_pixel_avg_varianceNxM(64, 64);