From: "H.J. Lu" <hjl.tools@gmail.com>
To: Jeff Law <jeffreyalaw@gmail.com>
Cc: gcc-patches@gcc.gnu.org
Subject: Re: [PATCH] Ignore debug insns with CONCAT and CONCATN for insn scheduling
Date: Wed, 21 Sep 2022 15:11:32 -0700 [thread overview]
Message-ID: <CAMe9rOrTBDoCGqC+u90XBDfvRjPwYYJTqOhsqbJiNpSfpaE=Gg@mail.gmail.com> (raw)
In-Reply-To: <af9cf3e2-11a5-e6c1-1738-b87a53e0ce95@gmail.com>
On Wed, Sep 7, 2022 at 10:03 AM Jeff Law via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
>
>
> On 9/2/2022 8:36 AM, H.J. Lu via Gcc-patches wrote:
> > CONCAT and CONCATN never appear in the insn chain. They are only used
> > in debug insn. Ignore debug insns with CONCAT and CONCATN for insn
> > scheduling to avoid different insn orders with and without debug insn.
> >
> > gcc/
> >
> > PR rtl-optimization/106746
> > * sched-deps.cc (sched_analyze_2): Ignore debug insns with CONCAT
> > and CONCATN.
> Shouldn't we be ignoring everything in a debug insn? I don't see why
> CONCAT/CONCATN are special here.
Debug insns are processed by insn scheduling. I think it is to improve debug
experiences. It is just that there are no matching usages of CONCAT/CONCATN
in non-debug insns.
--
H.J.
next prev parent reply other threads:[~2022-09-21 22:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-02 14:36 H.J. Lu
2022-09-07 17:02 ` Jeff Law
2022-09-21 22:11 ` H.J. Lu [this message]
2022-09-24 20:37 ` Jeff Law
2022-09-26 19:52 ` H.J. Lu
2022-09-26 23:23 ` Jeff Law
2022-09-26 23:43 ` Jakub Jelinek
2022-09-27 1:40 ` Jeff Law
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