Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/arch/dotproductavx.cpp @ 29:f76e6575dca9 v1.26.4+1

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+++++ v1.26.4+1
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 19:59:23 +0200
parents b50eed0cc0ef
children
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2
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: dotproductavx.cpp
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3 // Description: Architecture-specific dot-product function.
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4 // Author: Ray Smith
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5 //
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6 // (C) Copyright 2015, Google Inc.
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7 // Licensed under the Apache License, Version 2.0 (the "License");
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8 // you may not use this file except in compliance with the License.
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9 // You may obtain a copy of the License at
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10 // http://www.apache.org/licenses/LICENSE-2.0
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11 // Unless required by applicable law or agreed to in writing, software
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12 // distributed under the License is distributed on an "AS IS" BASIS,
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13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 // See the License for the specific language governing permissions and
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15 // limitations under the License.
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16 ///////////////////////////////////////////////////////////////////////
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17
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18 #if !defined(__AVX__)
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19 # if defined(__i686__) || defined(__x86_64__)
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20 # error Implementation only for AVX capable architectures
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21 # endif
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22 #else
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23
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24 # include <immintrin.h>
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25 # include <cstdint>
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26 # include "dotproduct.h"
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27
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28 namespace tesseract {
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29
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30 // Computes and returns the dot product of the n-vectors u and v.
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31 // Uses Intel AVX intrinsics to access the SIMD instruction set.
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32 #if defined(FAST_FLOAT)
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33 float DotProductAVX(const float *u, const float *v, int n) {
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34 const unsigned quot = n / 8;
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35 const unsigned rem = n % 8;
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36 __m256 t0 = _mm256_setzero_ps();
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37 for (unsigned k = 0; k < quot; k++) {
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38 __m256 f0 = _mm256_loadu_ps(u);
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39 __m256 f1 = _mm256_loadu_ps(v);
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40 f0 = _mm256_mul_ps(f0, f1);
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41 t0 = _mm256_add_ps(t0, f0);
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42 u += 8;
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43 v += 8;
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44 }
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45 alignas(32) float tmp[8];
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46 _mm256_store_ps(tmp, t0);
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47 float result = tmp[0] + tmp[1] + tmp[2] + tmp[3] + tmp[4] + tmp[5] + tmp[6] + tmp[7];
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48 for (unsigned k = 0; k < rem; k++) {
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49 result += *u++ * *v++;
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50 }
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51 return result;
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52 }
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53 #else
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54 double DotProductAVX(const double *u, const double *v, int n) {
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55 const unsigned quot = n / 8;
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56 const unsigned rem = n % 8;
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57 __m256d t0 = _mm256_setzero_pd();
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58 __m256d t1 = _mm256_setzero_pd();
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59 for (unsigned k = 0; k < quot; k++) {
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60 __m256d f0 = _mm256_loadu_pd(u);
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61 __m256d f1 = _mm256_loadu_pd(v);
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62 f0 = _mm256_mul_pd(f0, f1);
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63 t0 = _mm256_add_pd(t0, f0);
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64 u += 4;
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65 v += 4;
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66 __m256d f2 = _mm256_loadu_pd(u);
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67 __m256d f3 = _mm256_loadu_pd(v);
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68 f2 = _mm256_mul_pd(f2, f3);
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69 t1 = _mm256_add_pd(t1, f2);
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70 u += 4;
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71 v += 4;
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72 }
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73 t0 = _mm256_hadd_pd(t0, t1);
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74 alignas(32) double tmp[4];
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75 _mm256_store_pd(tmp, t0);
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76 double result = tmp[0] + tmp[1] + tmp[2] + tmp[3];
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77 for (unsigned k = 0; k < rem; k++) {
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78 result += *u++ * *v++;
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79 }
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80 return result;
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81 }
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82 #endif
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83
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84 } // namespace tesseract.
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85
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86 #endif