[Bug tree-optimization/88713] Vectorized code slow vs. flang

ubizjak at gmail dot com gcc-bugzilla@gcc.gnu.org
Wed Jan 23 20:20:00 GMT 2019


--- Comment #48 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to rguenther@suse.de from comment #47)
> >But why don't we generate sqrtps for vector sqrtf?
> That's the default for - mrecip back in time we benchmarked it and scalar
> recip miscompares sth.

It was polyhedron benchmark, in one benchmark, the index was calculated from
square root, and that was too sensitive for 2 ULP difference.

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