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SIGSEGV is a segmentation violation and a modelsim crash, nothing wrong with your code neccesarily. I suggest reporting the problem to mentor.
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I don't think Mentor will be of great help ... I searched their web-site (Dave Howard pointed me to it), even registered, but didn't get far. Reporting a problem is well hidden, sending a 'don't bother, we are not interested' message.
I guess I could try Timing simulation, but that runs rather slow, and I have to encapsulate the actual code in a bigger project, which I 'll have to simulate as well, so getting rid of this SIGSEGV error would be great. I'll try Dave's suggestion first.
It may have a problem with some of my functions. I'll use the binary cut and search approach to see where it goes wrong.