How do I get real integer overflows in MATLAB/Octave?

Posted by marvin2k on Stack Overflow See other posts from Stack Overflow or by marvin2k
Published on 2010-03-11T13:32:06Z Indexed on 2010/03/12 17:37 UTC
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matlab

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overflow

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integer-overflow

I'm working on a verification-tool for some VHDL-Code in MATLAB/Octave. Therefore I need data types which generate "real" overflows:

intmax('int32') + 1
ans = -2147483648

Later on, it would be helpful if I can define the bit width of a variable, but that is not so important right now.

When I build a C-like example, where a variable gets increased until it's smaller than zero, it spins forever and ever:

test = int32(2^30);
while (test > 0)
    test = test + int32(1);
end

Another approach I tried was a custom "overflow"-routine which was called every time after a number is changed. This approach was painfully slow, not practicable and not working in all cases at all. Any suggestions?

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