C++ error: ‘_mm_sin_ps’ was not declared in this scope

Question

I'm trying to benchmark different ways to apply a function to an array.

why is https://software.intel.com/sites/landingpage/IntrinsicsGuide/#expand=3260,2124,4779,4779&cats=Trigonometry&text=_sin

_mm_sin_ps not known to my scope but _mm_sqrt_ps is?

how do I make it known? And compile it without errors.

#include <random>
#include <iostream>
#include <cmath>
#include <chrono>
#include <algorithm>
#include <valarray>
#include "immintrin.h"
#include <array>
int main()
{
    std::cout<<"start\n";
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_real_distribution<> dis(-1000, 1000);
    int N=100;
    while(N--)
    {   
        std::cout<<"\nN: "<<N;

    const int T1=4E6;
      { 
        int T=T1,T0=T1/4;
        std::array<float,T1> array;
        while(T--)
        {
            array[T]=dis(gen);
        }
        auto start_time = std::chrono::high_resolution_clock::now();
        auto it =array.begin();
        while(T0--)
        {
            __m128 X = _mm_loadu_ps(it);
            __m128 result = _mm_sin_ps(X);
            _mm_storeu_ps(it, result);
            it+=4;
        }
        auto time2=std::chrono::high_resolution_clock::now()-start_time;
            std::cout<<"\nintr1: "<<std::chrono::duration_cast<std::chrono::microseconds>(time2).count();
        }
  }
    std::cout<<"\nfin\n";
    return 0;
}

compiler

g++ -v

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu      4.8.2-19ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs   --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable- plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu  --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) 

Answer 1

_mm_sin_ps is part of the SVML library, shipped with intel compilers only. GCC developers focused on wrapping machine instructions and simple tasks, so there's no SVML in immintrin.h so far.

You have to use a library or write it by yourself. Sinus implementation:

• Taylor series
• CORDIC
• Quadratic curve