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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/100085] Bad code for union transfer from __float128 to vector types
Date: Mon, 24 May 2021 21:49:04 +0000 [thread overview]
Message-ID: <bug-100085-4-NfAroqpozk@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-100085-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100085
--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to luoxhu from comment #7)
> (In reply to Segher Boessenkool from comment #3)
> > The rotates in 6 and 7 are not merged, and neither are the vec_selects in
> > 8 and 9. Both should be pretty easy to do, there is no unspec in sight,
> > etc.
>
> Should this be done in pass bswaps or combine or by peephole2? :)
It should be done by simplify-rtx.c at least (which will make it work in
combine
and other places): two rotates that together do nothing should be optimised to
that, or generally, two rotates should be optimised to just one (which then can
be optimised to nothing). Similar for vec_select. Maybe something in bswaps
can help as well, I don't know, I haven't looked closely yet.
next prev parent reply other threads:[~2021-05-24 21:49 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-14 18:19 [Bug rtl-optimization/100085] New: " munroesj at gcc dot gnu.org
2021-04-14 18:22 ` [Bug rtl-optimization/100085] " munroesj at gcc dot gnu.org
2021-04-15 6:59 ` [Bug target/100085] " rguenth at gcc dot gnu.org
2021-04-15 18:41 ` segher at gcc dot gnu.org
2021-04-16 20:30 ` munroesj at gcc dot gnu.org
2021-04-29 15:04 ` munroesj at gcc dot gnu.org
2021-04-30 19:52 ` bergner at gcc dot gnu.org
2021-05-24 6:41 ` luoxhu at gcc dot gnu.org
2021-05-24 21:49 ` segher at gcc dot gnu.org [this message]
2021-06-02 8:27 ` luoxhu at gcc dot gnu.org
2021-06-09 5:13 ` luoxhu at gcc dot gnu.org
2021-06-09 21:35 ` bergner at gcc dot gnu.org
2021-06-09 22:08 ` segher at gcc dot gnu.org
2021-06-10 15:00 ` munroesj at gcc dot gnu.org
2021-06-11 20:28 ` segher at gcc dot gnu.org
2022-01-14 17:17 ` wschmidt at gcc dot gnu.org
2022-02-24 20:48 ` munroesj at gcc dot gnu.org
2022-02-24 20:53 ` munroesj at gcc dot gnu.org
2022-02-24 21:17 ` segher at gcc dot gnu.org
2022-02-24 21:22 ` segher at gcc dot gnu.org
2022-02-24 21:26 ` segher at gcc dot gnu.org
2022-02-25 15:31 ` munroesj at gcc dot gnu.org
2022-02-25 22:57 ` segher at gcc dot gnu.org
2022-02-26 16:22 ` munroesj at gcc dot gnu.org
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