Intel® C++ Compiler

possible icc bug with for loop condition?


I have a program which does 1-byte vector sum using SSE intrinsics.

When I compile it with Intel compiler (ICC 15.0.1, x86_64, Linux, SandyBridge CPU) it segfaults, it looks like the end condition of the loop is not checked correctly. Same code works with GCC.

My only optimization flag -s "-O3" (When compiling with -O1 the program works).

icc compile error on OS X

The code:

int main() {
#ifdef __clang_version__
printf("%s\n", __clang_version__);

__clang_version__ is a builtin macro defined by clang, and is supposed to be irrelevant to icc. But icc emits a compile error when compiling this code:

test.c(5): error: extra text after expected end of number
printf("%s\n", __clang_version__);

This looks like a bug.

OS X 10.10.3
icc 15.0.2

problems of mixed program with fortran

I called a Fortran subroutine from a c++ project, in which the fortran subroutine is packed in an library created by the IVF. However, the link always fails with an error LNK2019. 

I set up an simple test project to simulate the problem. 

The fortran subroutine is a simple summation of integers:

Help tuning icc output for large metaprogram

We have a large metaprogram that helps the compiler process a type object and from it produce very efficient code. clang v3.5 produces the correct optimised output, but we can't reproduce this with icc 15.2.164 - icc does not optimise the code fully. Request suggestions for flags/knobs to try.

Why is my project still being linked using LINK instead of xilink?

I've just converted a project that used the Microsoft compiler to use the Intel one. I'm using Visual Studio 2013 and Intel C++ 15.

Now, looking at compiler output, I see the following:

1>icl: : warning #10210: problem with Microsoft compilation of 'Everything.cpp'
1>Everything.obj : warning LNK4229: invalid directive '/Intel(R) compiler non-linkable IL object file' encountered; ignored
1>LINK : fatal error LNK1561: entry point must be defined
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

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