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Date: Tue, 23 Sep 2014 16:00:00 -0000
From: Jeff Law <law@redhat.com>
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To: Jakub Jelinek <jakub@redhat.com>, Ilya Enkovich <enkovich.gnu@gmail.com>
CC: Vladimir Makarov <vmakarov@redhat.com>, gcc@gnu.org,        gcc-patches <gcc-patches@gcc.gnu.org>,        Evgeny Stupachenko <evstupac@gmail.com>,        Richard Biener <richard.guenther@gmail.com>,        Uros Bizjak <ubizjak@gmail.com>, Petr Machata <pmachata@redhat.com>
Subject: Re: Enable EBX for x86 in 32bits PIC code
References: <53FB5184.3030500@redhat.com> <CAMbmDYbP77pmkqpJD8cnXbe7_8aRMnYF-tnfKRubULn8-aDCdw@mail.gmail.com> <CAMbmDYacBWjKtCYPB0A2m=fkUTk_Wt5D6f2aEkH7C3paWaR7ag@mail.gmail.com> <53FCA6F5.7020405@redhat.com> <20140826213712.GA39451@msticlxl57.ims.intel.com> <53FE3D46.8050904@redhat.com> <CAMbmDYZxt7wceND52mb9rM+poTNpjFtLyj2WT5qatbjMdLWmbg@mail.gmail.com> <CAMbmDYb9E6-DpCd8cx+X-4d3oDkLMTo63ibojAY+Lsf9L-UNRA@mail.gmail.com> <540777C0.9050106@redhat.com> <20140923135437.GD35262@msticlxl57.ims.intel.com> <20140923143419.GN17454@tucnak.redhat.com>
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On 09/23/14 08:34, Jakub Jelinek wrote:
> On Tue, Sep 23, 2014 at 05:54:37PM +0400, Ilya Enkovich wrote:
>> use fixed EBX at least until we make sure pseudo PIC doesn't harm debug
>> info generation.  If we have such option then gcc.target/i386/pic-1.c and
>
> For debug info, it seems you are already handling this in
> delegitimize_address target hook, I'd suggest just building some very large
> shared library at -O2 -g -fpic on i?86 and either look at the
> sizes of .debug_info/.debug_loc sections with/without the patch,
> or use the locstat utility from elfutils (talk to Petr Machata if needed).
Can't hurt, but I really don't see how changing from a fixed to an 
allocatable register is going to muck up debug info in any significant 
way.

jeff