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Date: Mon, 21 Jan 2013 17:37:00 -0000
Message-ID: <CAFULd4Zfe_5AJFtxM_WOpDk2QRTFEyhisNQ7tkYaRhzZ5YieKw@mail.gmail.com>
Subject: Re: [PATCH v2, haifa-sched]: Fix PR56023, -fcompare-debug failure due to sched1 pass on 4.6 branch
From: Uros Bizjak <ubizjak@gmail.com>
To: gcc-patches@gcc.gnu.org
Cc: =?ISO-8859-1?Q?Ra=FAl_Porcel?= <armin76@gentoo.org>, 	Vladimir Makarov <vmakarov@redhat.com>
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On Mon, Jan 21, 2013 at 1:27 PM, Uros Bizjak <ubizjak@gmail.com> wrote:

>> We should not update ticks of instructions, dependent on debug
>> instruction. Without the patch, the scheduling order depends on the
>> presence of debug instructions and leads to -fcompare-debug failures.
>
> Attached patch refines previous patch to reject only cases where
> non-debug insns depend on debug instructions. We can still fix
> inter-ticks of dependent debug insns, without affecting emitted
> real-insn sequences.

FTR, from offline discussion with Vlad, setting ticks of debug
instructions is not necessary (and just wastes cycles), so I will
commit version 1 of the patch.

Uros.