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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/97770] [ICELAKE]suboptimal vectorization for vpopcntw/b/q
Date: Fri, 11 Jun 2021 07:25:26 +0000 [thread overview]
Message-ID: <bug-97770-4-fUPB6TA03l@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-97770-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97770
--- Comment #20 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #19)
> (In reply to rguenther@suse.de from comment #18)
> >
> > That's going to work I guess but it will pessimize general optimization
> > which no longer know this is computing popcount (not sure if the old
> > version exposed that fact).
>
> Do we have testcase for that?
Sth like
int
foo (unsigned long long a)
{
return _mm_popcnt_u64 (a) == 0;
}
basically anything that triggers a simplification of POPCOUNT as implemented
in match.pd (there are quite some). But no, I don't think we have any
of those using the x86 intrinsics in the testsuite.
next prev parent reply other threads:[~2021-06-11 7:25 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-10 2:12 [Bug target/97770] New: Missing vectorization for vpopcnt crazylht at gmail dot com
2020-11-10 2:14 ` [Bug target/97770] " crazylht at gmail dot com
2020-11-10 3:04 ` [Bug target/97770] [ICELAKE]Missing " crazylht at gmail dot com
2020-11-10 3:21 ` crazylht at gmail dot com
2020-11-10 8:12 ` rguenth at gcc dot gnu.org
2020-11-10 8:37 ` crazylht at gmail dot com
2020-11-10 8:55 ` rguenth at gcc dot gnu.org
2020-11-10 9:07 ` tkoenig at gcc dot gnu.org
2020-11-10 10:14 ` ubizjak at gmail dot com
2020-11-12 5:18 ` crazylht at gmail dot com
2020-11-12 7:33 ` rguenth at gcc dot gnu.org
2020-11-12 8:47 ` crazylht at gmail dot com
2020-12-03 2:03 ` cvs-commit at gcc dot gnu.org
2020-12-03 2:04 ` crazylht at gmail dot com
2020-12-03 11:24 ` [Bug tree-optimization/97770] " rguenth at gcc dot gnu.org
2021-06-04 7:41 ` crazylht at gmail dot com
2021-06-07 11:33 ` rguenth at gcc dot gnu.org
2021-06-10 3:29 ` crazylht at gmail dot com
2021-06-10 6:48 ` [Bug tree-optimization/97770] [ICELAKE]suboptimal vectorization for vpopcntw/b/q rguenther at suse dot de
2021-06-10 18:32 ` hjl.tools at gmail dot com
2021-06-11 7:25 ` rguenth at gcc dot gnu.org [this message]
2021-06-22 2:40 ` cvs-commit at gcc dot gnu.org
2021-06-22 2:46 ` crazylht at gmail dot com
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