https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123826
Hongtao Liu <liuhongt at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |liuhongt at gcc dot gnu.org
--- Comment #6 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #0)
> Created attachment 63490 [details]
> testcase
>
> From:
> https://mastodon.social/@dotstdy/115960430921170421
> https://godbolt.org/z/xahMha3zY
>
> Take the attached testcase.
> GCC will simplify `pow(a, 2.0)` at -O2 into a*a and constant fold
> `pow(DBL_MAX, 2.0)` (in general). This means we lose the errno setting.
>
> Note changing this might lose some performance ...
I saw 2 benchmarks in next SPECcpu regressed by ~20% for O2 performance due to
r16-7264.
