Re: [Iverilog-devel] VVP Performance boots

[Cary R. <cy...@ya...>]

--- On Mon, 4/21/08, Stephen Williams <st...@ic...> wrote:
 
> I think we are looking for some sort of uninitialized
> memory problem.

Our internet and phones are down at work so I will try and look at your suggestions tomorrow. I believe I ran valgrind on the failing tests looking for this type of problem and found nothing!

I have an email at work waiting to send about the writemem tests. Here is a brief synopsis. The problems with the three writemem tests appears to be related to a different, but recent patch. I didn't track down which one yet. It looks like the compiler is incorrectly evaluating the 1 << (6-code) in the comparison. The 1 is being loaded as a two bit value not the 32 bit integer it should be. This means when code is less than five the value is being set to zero. FYI explicitly setting the width of 1 (32'b1) fixes the problem.

Cary 


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