https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109154

--- Comment #22 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #21)
> Created attachment 54770 [details]
> gcc13-pr109154.patch
> 
> So what about this then?
> It matches the x86 FTZ behavior, because FTZ is a masked reaction to
> underflow
> exception, so for operations like comparisons nothing is flushed to zero nor
> comparing as it was flushed to zero.
> But no idea what e.g. Alpha will do, if it has in hardware support for
> comparisons including denormals...

I think that's reasonable but it doesn't fix the regression, we still miss
to recompute zone1_17 somehow.

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