[Bug middle-end/323] optimized code gives strange floating point results

["manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=323

--- Comment #198 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Vincent Lefèvre from comment #197)
> (In reply to Manuel López-Ibáñez from comment #196)
> > Also, the official FAQ for this (https://gcc.gnu.org/bugs/#nonbugs_general)
> > is seriously lacking info and outdated. From now on, I'll point people to:
> > https://gcc.gnu.org/wiki/FAQ#PR323
> 
> Note that this bug was mainly about the excess precision of x87 FPU, though

I added your comment to the FAQ but feel welcome to extend it:
https://gcc.gnu.org/wiki/FAQ#PR323

What it is also missing is a criteria to distinguish normal behavior from
actual GCC bugs (and there are GCC bugs like bug 37845 and others for
optimizations that should only be done with ffast-math). Currently, any
floating-point issue is likely to end up here.

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