From: Jeff Law <jeffreyalaw@gmail.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: gcc-patches@gcc.gnu.org
Subject: Re: [PATCH] Ignore debug insns with CONCAT and CONCATN for insn scheduling
Date: Sat, 24 Sep 2022 14:37:26 -0600 [thread overview]
Message-ID: <93fb0c92-c6a4-450b-2d0a-eddd30543fae@gmail.com> (raw)
In-Reply-To: <CAMe9rOrTBDoCGqC+u90XBDfvRjPwYYJTqOhsqbJiNpSfpaE=Gg@mail.gmail.com>
On 9/21/22 16:11, H.J. Lu wrote:
> 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.
But from a dependency standpoint ISTM all debug insn can be ignored. I
still don't see why concat/concatn should be special here.
jeff
next prev parent reply other threads:[~2022-09-24 20:37 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
2022-09-24 20:37 ` Jeff Law [this message]
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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