Intel® C++ Compiler

struggling to vectorize code

Hey everyone, 

 

I'm looking for help about loop vectorization. I'm trying to vectorize and optimize some loop but I don't understand what I'm doing wrong. The compiler can not vectorize because of FLOW and ANTI dependency. I thought I could remove it by doing a change in the code cf. "my attempt code" but this is not working. Can someone explain me why ?

Compilation errors on standard header files in libc++

MacOS 10.10.3, Xcode 6.3.2, Intel Composer 2015 sp 3. Compiling against 10.10 (or 10.9) SDK, including any standard header (such as <algorithm>) that eventually includes cpp_type_traits.h or allocator.h, I get the errors below if the C++ standard library is set to libc++. The errors go away if I use libstdc++:

cpp_type_traits (from OS X 10.10/usr/include/c++/4.2.1/bits/cpp_type_traits.h)

 

line 379:  // For the immediate use, the following is a good approximation.

template<typename _Tp>

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  • valid c++ variadic code causes segfault with icc

    This code compiles fine with gcc and clang, but causes a segfault with icc 2016 (used -std=c++14)

     

    #include <tuple>
    #include <type_traits>
    #include <utility>
    
    template<class... Tx>
    void f(const std::tuple<Tx...>& t,
      std::enable_if_t<Tx() || true, int>... indexes) {
    }
    
    int main() {
      auto t = std::make_tuple(3, 4.0);
      f(t, 1 ,2);
      return 0;
    }
    

     

    icpc not generating AVX/AVX2 instructions

    I compile the following C function

     

    void multIJK(double *restrict a, double *restrict b, double *restrict c, 
    	     int dim){
      for(int i=0; i < dim; i++)
        for(int j=0; j < dim; j++)
          for(int k=0; k < dim; k++)
    	c[i+j*dim] += a[i+k*dim]*b[k+j*dim];
    }

    using the following options:

    icpc  -O3 -prec-div -no-ftz -restrict -Wshadow -MMD -MP -fno-inline-functions -mkl -fno-verbose-asm  -S xchg-mult.cpp

    Composer 2015 update 4 installer hiccups

    I installed Update 4 from a couple of days ago this morning.  It removes all the old Update 3 components, but doesn't install any of the new ones.  You have to run the installer again to get the new redists and so on.  This is on Windows 8.1 Pro 64.  Not a big problem but I thought you should know.

    Damien

    Compilations fails but produces valid obj

    Hi

    I have a part of a big project that involve lot's of forceinlining that use to compile perfectly with Intel 13.1 and Intel 14.0.

    Since Intel C++ 15.0 I have this message:

      blabla.cpp
      remark #11074: Inlining inhibited by limit max-size
      remark #11074: Inlining inhibited by limit max-total-size
      remark #11075: To get full report use -Qopt-report:4 -Qopt-report-phase ipo

    Which I don't mind, the compiler is right, at some point I will have to remove some useless forceinline to reduce compile time, so I am fine with it.

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