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[Bug tree-optimization/67731] Combine of OR'ed bitfields should use bit-test
- From: "rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 09 Jun 2017 10:54:29 +0000
- Subject: [Bug tree-optimization/67731] Combine of OR'ed bitfields should use bit-test
- Auto-submitted: auto-generated
- References: <bug-67731-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67731
--- Comment #7 from rguenther at suse dot de <rguenther at suse dot de> ---
On Fri, 9 Jun 2017, tetra2005 at gmail dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67731
>
> --- Comment #6 from Yuri Gribov <tetra2005 at gmail dot com> ---
> (In reply to rguenther@suse.de from comment #5)
> > On Fri, 9 Jun 2017, tetra2005 at gmail dot com wrote:
> >
> > > This should probly go to reassoc? Or better keep it in folder?
> >
> > As loads are involved it doesn't really fit reassoc. Likewise it doesn't
> > really fit the folder.
>
> The || case is optimized by the folder.
Yes, but that's quite premature and doesn't work for
if (..)
else if (..)