1 /* 2 * Copyright (c) 2015 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include <arm_neon.h> 12 #include <assert.h> 13 14 #include "./vp9_rtcd.h" 15 16 int64_t vp9_block_error_fp_neon(const int16_t *coeff, const int16_t *dqcoeff, 17 int block_size) { 18 int64x2_t error = vdupq_n_s64(0); 19 20 assert(block_size >= 8); 21 assert((block_size % 8) == 0); 22 23 do { 24 const int16x8_t c = vld1q_s16(coeff); 25 const int16x8_t d = vld1q_s16(dqcoeff); 26 const int16x8_t diff = vsubq_s16(c, d); 27 const int16x4_t diff_lo = vget_low_s16(diff); 28 const int16x4_t diff_hi = vget_high_s16(diff); 29 // diff is 15-bits, the squares 30, so we can store 2 in 31-bits before 30 // accumulating them in 64-bits. 31 const int32x4_t err0 = vmull_s16(diff_lo, diff_lo); 32 const int32x4_t err1 = vmlal_s16(err0, diff_hi, diff_hi); 33 const int64x2_t err2 = vaddl_s32(vget_low_s32(err1), vget_high_s32(err1)); 34 error = vaddq_s64(error, err2); 35 coeff += 8; 36 dqcoeff += 8; 37 block_size -= 8; 38 } while (block_size != 0); 39 40 return vgetq_lane_s64(error, 0) + vgetq_lane_s64(error, 1); 41 } 42
