Comparing G++ and Intel Compilers and Vectorized Code

Nerval's Lobster writes "A compiler can take your C++ loops and create vectorized assembly code for you. It's obviously important that you RTFM and fully understand compiler options (especially since the defaults may not be what you want or think you're getting), but even then, do you trust that the compiler is generating the best code for you? Developer and editor Jeff Cogswell compares the g++ and Intel compilers when it comes to generating vectorized code, building off a previous test that examined the g++ compiler's vectorization abilities, and comes to some definite conclusions. 'The g++ compiler did well up against the Intel compiler,' he wrote. 'I was troubled by how different the generated assembly code was between the 4.7 and 4.8.1 compilers—not just with the vectorization but throughout the code.' Do you agree?"

Comments

Re:Documentation is King

[CajunArson]

I'm sorry, you lost the right to put on the whole "Oh poor little AMD is being abused by the big bad monopolist!" the day that AMD came out with Mantle and started leveraging it's 100% monopoly in the console market in a much much worse way than Intel ever did with its 70 - 80% "monopoly" in the desktop market.