xsimd

介绍

官网
https://xsimd.readthedocs.io/en/latest/
https://github.com/xtensor-stack/xsimd

安装

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mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=/path/to/prefix ..
make install

支持的 指令集

简单例子

将 根目录下的 include 文件内容，拷贝到 工程目录下即可

一个例子

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#include "xsimd/xsimd.hpp"
#include <iostream>

namespace xs = xsimd;

int main(int argc, char* argv[]) {
    xs::batch<double, xs::avx> a = { 1.5, 2.5, 3.5, 4.5 };
    xs::batch<double, xs::avx> b = { 2.5, 3.5, 4.5, 5.5 };
    auto mean = (a + b) / 2;
    std::cout << mean << std::endl;
    return 0;
}

编译命令：

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g++ -std=c++17 -mavx2 simple.cpp -g -o simple

结果：

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(2.0, 3.0, 4.0, 5.0)

详细介绍

template<class T, class A>
class batch : public types::simd_register<T, A>, public xsimd::types::integral_only_operators<T, A>

batch of integer or floating point values.
Abstract representation of an SIMD register for floating point or integral value.
Template Parameters

• T – the type of the underlying values.
• A – the architecture this batch is tied too.

API

• Data transfer，from memory、to memory
• Arithmetic operators
• Comparison
• Bitwise
• Mathematical
• Reduction operators
• Type conversion
• Type Traits
• Alignment manipulation
• Architecture manipulation

参考

• Writing vectorized code