On Thu, 10 Aug 2017, Jackson Woodruff wrote:

> > We also change:
> > 
> >   x / (- y) -> (-x) / y
> > 
> > Which requires -fno-trapping-math.

I don't see why that requires -fno-trapping-math.  The exceptions should 
be identical from both variants, as should the result, as far as defined 
by C or IEEE 754 (it's possible it might affect the sign of a NaN result 
on some architectures, but only where that sign is unspecified in C and 
IEEE 754 terms, so such a change is OK).

Joseph S. Myers

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