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Re: [PATCH] df: Keep return address register undefined until epilogue_completed

From: Jeff Law <law at redhat dot com>
To: Steven Bosscher <stevenb dot gcc at gmail dot com>, Segher Boessenkool <segher at kernel dot crashing dot org>
Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>, Paolo Bonzini <bonzini at gnu dot org>, Seongbae Park <seongbae dot park at gmail dot com>, Kenneth Zadeck <zadeck at naturalbridge dot com>
Date: Fri, 9 Sep 2016 16:19:48 -0600
Subject: Re: [PATCH] df: Keep return address register undefined until epilogue_completed
Authentication-results: sourceware.org; auth=none
References: <c6b7f1d6bfb232511d9e0a3467bd87db65e27b6b.1472488939.git.segher@kernel.crashing.org> <CABu31nNY=8qaWgdtVA2Mc9J+zjm5HL+J--XNVKU4Zxx6h9QNyA@mail.gmail.com>

On 08/29/2016 02:19 PM, Steven Bosscher wrote:

On Mon, Aug 29, 2016 at 6:50 PM, Segher Boessenkool wrote:

This patch changes that so that that def is only added after
epilogue_completed.

...

Does this work on all other targets?


Guessing: not for targets where INCOMING_RETURN_ADDR_RTX is the stack register?
That'd be at least h8300, rl78, and rx.

On those ports INCOMING_RETURN_ADDR_RTX is (mem (sp)), not plain (sp).So they're not materially different than x86.



Jeff

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