Author mark.dickinson
Recipients koobs, mark.dickinson, vstinner
Date 2017-04-20.18:52:16
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Hmm. Just looked at dto5.c; nice work reducing it to something so simple.

This is looking a bit like either a strict-aliasing related problem, or a compiler bug, or both. My understanding of the "union trick" that dtoa.c uses is that it's well-defined under C99+TC3 (though that wasn't clear under the original C99), so it shouldn't be legitimate for an optimisation to cause different results to be produced.

So this is smelling like a compiler bug to me.
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