Segmentation fault using OpenMp and SSE?

This is a bug in the openMP implementation. I was having the same problem in gcc on Windows (MinGW). -mstackrealign command line option solved my problem.

This adds an instruction to the prolog of every function to realign the stack at the 16-byte boundary. I didn't notice any performance penalty. You can also try to add attribute__ ((force_align_arg_pointer)) to a function declaration, which should do the same, but only for a specific function.

You might have to put the SSE code in a separate function that you then call from the function with #pragma omp, so that the stack has a chance to be realigned.

I smell unaligned memory access. Its the only way code like that could explode(assuming that is the only code there). For that to happen the XMM registers wouldn't be used but rather stack memory, which is only aligned to 4 bytes, my guess is the omp code is messing up the alignment of the stack.

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