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But with gcc you get source code and cross-platform capability.
If you use systems based on the Intel architecture, then Intel C++ is an excellent choice. If you need OpenMP or automatic vectorization, Intel is your only choice given gcc's lack of these features. With version 7, Intel has also added full support for hyperthreading, which I'll be testing once I have a HT-enabled Pentium 4 in-house. The caveat: Intel does not support all of the gcc language extensions, and while it has been used to compile the Linux kernel and other free software projects, it is not a drop-in replacement for gcc. And I do have some reports of code that compiles incorrectly with Intel C++; on the other hand, I have such reports and experiences with every compiler I've ever used -- including gcc.
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