From: James Greenhalgh <james.greenhalgh@arm.com>
To: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>, Jeff Law <law@redhat.com>,
nd <nd@arm.com>
Subject: Re: [PATCH][AArch64] Simplify frame layout for stack probing
Date: Thu, 26 Oct 2017 15:23:00 -0000 [thread overview]
Message-ID: <20171026151935.GB25439@arm.com> (raw)
In-Reply-To: <DB6PR0801MB20538770C0B5E53FBBB7D48B83B80@DB6PR0801MB2053.eurprd08.prod.outlook.com>
On Tue, Jul 25, 2017 at 02:58:04PM +0100, Wilco Dijkstra wrote:
> This patch makes some changes to the frame layout in order to simplify
> stack probing. We want to use the save of LR as a probe in any non-leaf
> function. With shrinkwrapping we may only save LR before a call, so it
> is useful to define a fixed location in the callee-saves. So force LR at
> the bottom of the callee-saves even with -fomit-frame-pointer.
>
> Also remove a rarely used frame layout that saves the callee-saves first
> with -fomit-frame-pointer.
>
> OK for commit (and backport to GCC7)?
OK. Leave it a week before backporting.
Reviewed by: James Greenhalgh <james.greenhalgh@arm.com>
Thanks,
James
>
> ChangeLog:
> 2017-07-25 Wilco Dijkstra <wdijkstr@arm.com>
>
> * config/aarch64/aarch64.c (aarch64_layout_frame):
> Ensure LR is always stored at the bottom of the callee-saves.
> Remove frame option which saves callee-saves at top of frame.
>
next prev parent reply other threads:[~2017-10-26 15:19 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-25 13:58 Wilco Dijkstra
2017-07-26 19:16 ` Jeff Law
2017-08-01 10:18 ` Wilco Dijkstra
2017-08-15 16:27 ` Wilco Dijkstra
2017-10-26 15:23 ` James Greenhalgh [this message]
2017-10-27 9:26 ` James Greenhalgh
2017-11-03 16:47 ` Wilco Dijkstra
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