Kernel name with leading x character throws exception

[stwunsch]

Hi,

A kernel with the name volk_32f_x2_x_32f throws an exception during ctest. The problem is simply a leading x in the kernel name "x", which looks like the "x" of the input signiture.
If this is known and intended, just close the issue!

Greetings
Stefan

[stwunsch]

I mean this exception in qa_utils.cc:376:

catch (boost::bad_lexical_cast& error) {
    std::cerr << "Error: unable to get function signature from kernel name" << std::endl;
    std::cerr << "  - " << name << std::endl;
    return false;
}

[n-west]

Hey Stefan, not intended but not something anyone has complained about. If the fix is as easy as I think it might be I can fix it, otherwise it's kind of a niche feature (especially the x case) that it might be a do not fix.

[douggeiger]

I'm guessing this is the signature parsing code not knowing when it's parsing signatures (ala x2 or x3 to signify multiple inputs of the same type) vs. when it is getting to the name of the kernel. I'm not confident there is an unamiguous way for the parser to know this in advance - except to check if the second character is a digit or not - which basically just makes x[0-9]+ a special (not-allowed at the beginning of the name) vs. just x* being special.

[n-west]

Fixed

[michaelld]

@ValZapod Let's take the discussion to this issue #326