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Re: [RFC] Add middle end hook for stack red zone size
- From: "Joseph S. Myers" <joseph at codesourcery dot com>
- To: Jakub Jelinek <jakub at redhat dot com>
- Cc: Jiangning Liu <jiangning dot liu at arm dot com>, 'Joern Rennecke' <amylaar at spamcop dot net>, gcc at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org, vmakarov at redhat dot com, dje dot gcc at gmail dot com, Richard Henderson <rth at redhat dot com>, Ramana Radhakrishnan <Ramana dot Radhakrishnan at arm dot com>, 'Ramana Radhakrishnan' <ramana dot radhakrishnan at linaro dot org>
- Date: Mon, 1 Aug 2011 10:03:15 +0000 (UTC)
- Subject: Re: [RFC] Add middle end hook for stack red zone size
- References: <4e255312.0a852b0a.528d.6933SMTPIN_ADDED@mx.google.com> <CACUk7=WsaUN+TUw7rb8-o1EukoaCMrAh8bFJM6832LtRmfkofg@mail.gmail.com> <001e01cc4b33$6d3818f0$47a84ad0$@liu@arm.com> <20110725223319.petrcv01csccs44s-nzlynne@webmail.spamcop.net> <000001cc4ffd$48680ac0$d9382040$@liu@arm.com> <20110801091151.GD27949@sunsite.ms.mff.cuni.cz>
On Mon, 1 Aug 2011, Jakub Jelinek wrote:
> On Mon, Aug 01, 2011 at 11:44:04AM +0800, Jiangning Liu wrote:
> > It's quite necessary to solve the general problem in middle-end rather than in back-end.
>
> That's what we disagree on. All back-ends but ARM are able to handle it
> right, why can't ARM too? The ABI rules for stack handling in the epilogues
> are simply too diverse and complex to be handled easily in the scheduler.
Given that the long-standing open bugs relating to scheduling and stack
adjustments (30282, 38644) include issues for Power that do not yet appear
to have been fixed, even if other back ends are able to handle it right
they don't seem to do so at present.
--
Joseph S. Myers
joseph@codesourcery.com