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comparison mupdf-source/thirdparty/tesseract/src/arch/dotproductavx512.cpp @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 ///////////////////////////////////////////////////////////////////////
2 // File: dotproductavx512.cpp
3 // Description: Architecture-specific dot-product function.
4 // Author: Stefan Weil
5 //
6 // (C) Copyright 2022
7 // Licensed under the Apache License, Version 2.0 (the "License");
8 // you may not use this file except in compliance with the License.
9 // You may obtain a copy of the License at
10 // http://www.apache.org/licenses/LICENSE-2.0
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 ///////////////////////////////////////////////////////////////////////
17
18 #if !defined(__AVX__)
19 # if defined(__i686__) || defined(__x86_64__)
20 # error Implementation only for AVX capable architectures
21 # endif
22 #else
23
24 # include <immintrin.h>
25 # include <cstdint>
26 # include "dotproduct.h"
27
28 namespace tesseract {
29
30 // Computes and returns the dot product of the n-vectors u and v.
31 // Uses Intel AVX intrinsics to access the SIMD instruction set.
32 # if defined(FAST_FLOAT)
33 float DotProductAVX512F(const float *u, const float *v, int n) {
34 const unsigned quot = n / 16;
35 const unsigned rem = n % 16;
36 __m512 t0 = _mm512_setzero_ps();
37 for (unsigned k = 0; k < quot; k++) {
38 __m512 f0 = _mm512_loadu_ps(u);
39 __m512 f1 = _mm512_loadu_ps(v);
40 t0 = _mm512_fmadd_ps(f0, f1, t0);
41 u += 16;
42 v += 16;
43 }
44 float result = _mm512_reduce_add_ps(t0);
45 for (unsigned k = 0; k < rem; k++) {
46 result += *u++ * *v++;
47 }
48 return result;
49 }
50 # else
51 double DotProductAVX512F(const double *u, const double *v, int n) {
52 const unsigned quot = n / 8;
53 const unsigned rem = n % 8;
54 __m512d t0 = _mm512_setzero_pd();
55 for (unsigned k = 0; k < quot; k++) {
56 t0 = _mm512_fmadd_pd(_mm512_loadu_pd(u), _mm512_loadu_pd(v), t0);
57 u += 8;
58 v += 8;
59 }
60 double result = _mm512_reduce_add_pd(t0);
61 for (unsigned k = 0; k < rem; k++) {
62 result += *u++ * *v++;
63 }
64 return result;
65 }
66 # endif
67
68 } // namespace tesseract.
69
70 #endif