ref: 632ee6aa76df257a90430387eca6a6e79780491f
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 <assert.h> #include "./vpx_config.h" #include "vpx/vpx_integer.h" #include "vpx_dsp/arm/mem_neon.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 = rows, c; if (cols > 16) { do { for (c = 0; c < cols; c += 32) { const uint8x16_t s0 = vld1q_u8(&src[c + 0]); const uint8x16_t s1 = vld1q_u8(&src[c + 16]); const uint8x16_t p0 = vld1q_u8(&pred[c + 0]); const uint8x16_t p1 = vld1q_u8(&pred[c + 16]); const uint16x8_t d0 = vsubl_u8(vget_low_u8(s0), vget_low_u8(p0)); const uint16x8_t d1 = vsubl_u8(vget_high_u8(s0), vget_high_u8(p0)); const uint16x8_t d2 = vsubl_u8(vget_low_u8(s1), vget_low_u8(p1)); const uint16x8_t d3 = vsubl_u8(vget_high_u8(s1), vget_high_u8(p1)); vst1q_s16(&diff[c + 0], vreinterpretq_s16_u16(d0)); vst1q_s16(&diff[c + 8], vreinterpretq_s16_u16(d1)); vst1q_s16(&diff[c + 16], vreinterpretq_s16_u16(d2)); vst1q_s16(&diff[c + 24], vreinterpretq_s16_u16(d3)); } diff += diff_stride; pred += pred_stride; src += src_stride; } while (--r); } else if (cols > 8) { do { const uint8x16_t s = vld1q_u8(&src[0]); const uint8x16_t p = vld1q_u8(&pred[0]); const uint16x8_t d0 = vsubl_u8(vget_low_u8(s), vget_low_u8(p)); const uint16x8_t d1 = vsubl_u8(vget_high_u8(s), vget_high_u8(p)); vst1q_s16(&diff[0], vreinterpretq_s16_u16(d0)); vst1q_s16(&diff[8], vreinterpretq_s16_u16(d1)); diff += diff_stride; pred += pred_stride; src += src_stride; } while (--r); } else if (cols > 4) { do { const uint8x8_t s = vld1_u8(&src[0]); const uint8x8_t p = vld1_u8(&pred[0]); const uint16x8_t v_diff = vsubl_u8(s, p); vst1q_s16(&diff[0], vreinterpretq_s16_u16(v_diff)); diff += diff_stride; pred += pred_stride; src += src_stride; } while (--r); } else { assert(cols == 4); do { const uint8x8_t s = load_unaligned_u8(src, (int)src_stride); const uint8x8_t p = load_unaligned_u8(pred, (int)pred_stride); const uint16x8_t d = vsubl_u8(s, p); vst1_s16(diff + 0 * diff_stride, vreinterpret_s16_u16(vget_low_u16(d))); vst1_s16(diff + 1 * diff_stride, vreinterpret_s16_u16(vget_high_u16(d))); diff += 2 * diff_stride; pred += 2 * pred_stride; src += 2 * src_stride; r -= 2; } while (r); } }