tesseract/arch/dotproductavx.cpp
Stefan Weil e45d9587b4 arch: Remove stray ) in pragma ()
This fixes a warning from clang:

arch/dotproductavx.cpp:94:51: warning:
 unexpected token in pragma diagnostic [-Wunknown-pragmas]

Signed-off-by: Stefan Weil <sw@weilnetz.de>
2018-03-23 18:42:46 +01:00

116 lines
4.1 KiB
C++

///////////////////////////////////////////////////////////////////////
// File: dotproductavx.cpp
// Description: Architecture-specific dot-product function.
// Author: Ray Smith
// Created: Wed Jul 22 10:48:05 PDT 2015
//
// (C) Copyright 2015, Google Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
///////////////////////////////////////////////////////////////////////
#if !defined(__AVX__)
// Implementation for non-avx archs.
#include "dotproductavx.h"
#include <stdio.h>
#include <stdlib.h>
namespace tesseract {
double DotProductAVX(const double* u, const double* v, int n) {
fprintf(stderr, "DotProductAVX can't be used on Android\n");
abort();
}
} // namespace tesseract
#else // !defined(__AVX__)
// Implementation for avx capable archs.
#include <immintrin.h>
#include <stdint.h>
#include "dotproductavx.h"
#include "host.h"
namespace tesseract {
// Computes and returns the dot product of the n-vectors u and v.
// Uses Intel AVX intrinsics to access the SIMD instruction set.
double DotProductAVX(const double* u, const double* v, int n) {
int max_offset = n - 4;
int offset = 0;
// Accumulate a set of 4 sums in sum, by loading pairs of 4 values from u and
// v, and multiplying them together in parallel.
__m256d sum = _mm256_setzero_pd();
if (offset <= max_offset) {
offset = 4;
// Aligned load is reputedly faster but requires 32 byte aligned input.
if ((reinterpret_cast<uintptr_t>(u) & 31) == 0 &&
(reinterpret_cast<uintptr_t>(v) & 31) == 0) {
// Use aligned load.
__m256d floats1 = _mm256_load_pd(u);
__m256d floats2 = _mm256_load_pd(v);
// Multiply.
sum = _mm256_mul_pd(floats1, floats2);
while (offset <= max_offset) {
floats1 = _mm256_load_pd(u + offset);
floats2 = _mm256_load_pd(v + offset);
offset += 4;
__m256d product = _mm256_mul_pd(floats1, floats2);
sum = _mm256_add_pd(sum, product);
}
} else {
// Use unaligned load.
__m256d floats1 = _mm256_loadu_pd(u);
__m256d floats2 = _mm256_loadu_pd(v);
// Multiply.
sum = _mm256_mul_pd(floats1, floats2);
while (offset <= max_offset) {
floats1 = _mm256_loadu_pd(u + offset);
floats2 = _mm256_loadu_pd(v + offset);
offset += 4;
__m256d product = _mm256_mul_pd(floats1, floats2);
sum = _mm256_add_pd(sum, product);
}
}
}
// Add the 4 product sums together horizontally. Not so easy as with sse, as
// there is no add across the upper/lower 128 bit boundary, so permute to
// move the upper 128 bits to lower in another register.
__m256d sum2 = _mm256_permute2f128_pd(sum, sum, 1);
sum = _mm256_hadd_pd(sum, sum2);
sum = _mm256_hadd_pd(sum, sum);
double result;
// _mm256_extract_f64 doesn't exist, but resist the temptation to use an sse
// instruction, as that introduces a 70 cycle delay. All this casting is to
// fool the intrinsics into thinking we are extracting the bottom int64.
auto cast_sum = _mm256_castpd_si256(sum);
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
*(reinterpret_cast<int64_t*>(&result)) =
#if defined(_WIN32) || defined(__i386__)
// This is a very simple workaround that is activated
// for all platforms that do not have _mm256_extract_epi64.
// _mm256_extract_epi64(X, Y) == ((uint64_t*)&X)[Y]
((uint64_t*)&cast_sum)[0]
#else
_mm256_extract_epi64(cast_sum, 0)
#endif
;
#pragma GCC diagnostic pop
while (offset < n) {
result += u[offset] * v[offset];
++offset;
}
return result;
}
} // namespace tesseract.
#endif // ANDROID_BUILD