https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120747

--- Comment #17 from Filip Kastl <pheeck at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #15)
> So it looks like (a * b) are closer in value to (vnb12 * 1.2e+1 - c) than
> (vnb12 * 1.2e+1) is to (a * b - c) .

Btw, for the purpose of me trying to get better at debugging similar things,
how did you figure this out?  Did you perhaps run gromacs in a debugger and
looked at what values those variables usually have?  Or did you figure this out
from gromacs' source files?

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