From: Qing Zhao <qing.zhao@oracle.com>
To: Alexander Monakov <amonakov@ispras.ru>
Cc: Jose Marchesi <jose.marchesi@oracle.com>,
"gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH V2] Disable sched1 in functions that call setjmp
Date: Thu, 5 Jan 2023 18:11:17 +0000 [thread overview]
Message-ID: <BF1F1859-33D8-4C0F-956B-22FCD951FC82@oracle.com> (raw)
In-Reply-To: <0ad07be0-876d-cc24-6cdb-6b94690dfc52@ispras.ru>
Alexander,
(Sorry for the late reply due to holiday vacation).
> On Dec 24, 2022, at 3:10 AM, Alexander Monakov <amonakov@ispras.ru> wrote:
>
>
> On Fri, 23 Dec 2022, Qing Zhao wrote:
>
>> BTW, Why sched1 is not enabled on x86 by default?
>
> Register allocation is tricky on x86 due to small number of general-purpose
> registers, and sched1 can make it even more difficult. I think before register
> pressure modeling was added, sched1 could not be enabled because then allocation
> would sometimes fail, and now there's no incentive to enable it, as it is not so
> important for modern x86 CPUs. Perhaps someone else has a more comprehensive
> answer.
Okay. I see. Thanks for the explanation of the history.
>
>> Another question is: As discussed in the original bug PR57067:
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57067 The root cause of this
>> issue related to the abnormal control flow edges (from setjmp/longjmp) cannot
>> be represented correctly at RTL stage, shall we fix this root cause instead?
>
> You'd need an experienced reviewer to work with you, especially on high-level
> design decisions such as "How ABNORMAL_DISPATCHER should be represented on RTL".
> I'm afraid it's not just a matter of applying a small patch in one place.
I see. (And I guess so, fixing this is not a trivial work).
Qing
>
> Alexander
next prev parent reply other threads:[~2023-01-05 18:11 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-22 17:32 Jose E. Marchesi
2022-12-22 17:56 ` Alexander Monakov
2022-12-22 19:28 ` Qing Zhao
2022-12-23 7:33 ` Alexander Monakov
2022-12-23 14:34 ` Qing Zhao
2022-12-23 15:03 ` Alexander Monakov
2022-12-23 17:27 ` Jose E. Marchesi
2022-12-23 17:31 ` Alexander Monakov
2022-12-23 17:45 ` Jose E. Marchesi
2022-12-23 19:21 ` Qing Zhao
2022-12-23 19:36 ` Alexander Monakov
2022-12-23 19:57 ` Qing Zhao
2022-12-24 8:10 ` Alexander Monakov
2022-12-24 9:26 ` Richard Biener
2022-12-24 9:58 ` Jose E. Marchesi
2022-12-24 10:06 ` Richard Biener
2022-12-24 10:18 ` Alexander Monakov
2022-12-26 0:29 ` Segher Boessenkool
2023-01-05 18:11 ` Qing Zhao [this message]
2022-12-23 10:05 ` Richard Sandiford
2022-12-23 10:42 ` Jose E. Marchesi
2023-01-13 18:20 ` [PATCH] sched-deps: do not schedule pseudos across calls [PR108117] Alexander Monakov
2023-01-13 18:23 ` Richard Sandiford
2023-01-13 18:33 ` Jose E. Marchesi
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