From: "Sriraman Tallam via gnu-gabi" <gnu-gabi@sourceware.org>
To: hegdesmailbox@gmail.com
Cc: Florian Weimer <fweimer@redhat.com>,
David Edelsohn <dje.gcc@gmail.com>,
Rafael Avila de Espindola <rafael.espindola@gmail.com>,
Binutils Development <binutils@sourceware.org>,
Alan Modra <amodra@gmail.com>, Cary Coutant <ccoutant@gmail.com>,
gnu-gabi@sourceware.org, Xinliang David Li <davidxl@google.com>,
Sterling Augustine <saugustine@google.com>,
Paul Pluzhnikov <ppluzhnikov@google.com>,
Ian Lance Taylor <iant@google.com>,
"H.J. Lu" <hjl.tools@gmail.com>,
Rahul Chaudhry <rahulchaudhry@google.com>,
Luis Lozano <llozano@google.com>,
Peter Collingbourne <pcc@google.com>,
Rui Ueyama <ruiu@google.com>,
llvm-dev@lists.llvm.org
Subject: Re: Reducing code size of Position Independent Executables (PIE) by shrinking the size of dynamic relocations section
Date: Sun, 01 Jan 2017 00:00:00 -0000 [thread overview]
Message-ID: <CAAs8Hmziqc0hebPndiGuZN=buFm=M+O+2fGCfsv_rvDro9zJZA@mail.gmail.com> (raw)
In-Reply-To: <7e698a5f-32d7-6549-7e23-8850b85e6c10@gmail.com>
+llvm-dev
Discussion here: https://sourceware.org/ml/gnu-gabi/2017-q2/msg00000.html
On Tue, May 2, 2017 at 10:17 AM, Suprateeka R Hegde
<hegdesmailbox@gmail.com> wrote:
> On 02-May-2017 12:05 AM, Florian Weimer wrote:
>> On 05/01/2017 08:28 PM, Suprateeka R Hegde wrote:
>>> So the ratio shows ~96% is RELATIVE reloc. And only ~4% others. This is
>>> not the case on HP-UX/Itanium. But as I said, this comparison does not
>>> make sense as the runtime architecture and ISA are totally different.
>>
>> It could be that HP-UX was written in a way to reduce relative
>> relocations,
>
> Rather, the Itanium runtime architecture itself provides a way to reduce
> them.
>
>> or that the final executables aren't actually PIC anymore.
>
> I was referring to shlibs (PIC) on HP-UX and it was implicit in my mind.
> Sorry for that.
>
> I just built a large C++ shlib both on HP-UX/Itanium with our aCC
> compiler and Linux x86-64 using GCC-6.2. The sources are almost same
> with only a couple of lines differing between platforms.
>
> (HP-UX/Linux)
> Total: 12224/38311
> RELATIVE: 18/6397
>
> I will try to check the reason for such a huge difference in RELATIVE
> reloc count. It might be useful for this discussion (just a guess)
>
> --
> Supra
next prev parent reply other threads:[~2017-05-08 20:55 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAGWvnynFwXFGLj3tAVgDatn0zmuHcWHyRNuDvR+wRZCXLnar_A@mail.gmail.com>
2017-01-01 0:00 ` Rafael Avila de Espindola
2017-01-01 0:00 ` David Edelsohn
2017-01-01 0:00 ` Suprateeka R Hegde
2017-01-01 0:00 ` Florian Weimer
2017-01-01 0:00 ` Suprateeka R Hegde
2017-01-01 0:00 ` Sriraman Tallam via gnu-gabi [this message]
2017-01-01 0:00 ` Rahul Chaudhry via gnu-gabi
2017-01-01 0:00 ` Florian Weimer
2017-01-01 0:00 ` Sriraman Tallam via gnu-gabi
2017-01-01 0:00 ` Rahul Chaudhry via gnu-gabi
[not found] ` <CAORpzuMftCGpXUObOyoFY0=jorMBDWEDbQJ23DifTNW3v-WA6Q@mail.gmail.com>
2017-01-01 0:00 ` Rahul Chaudhry via gnu-gabi
2017-01-01 0:00 ` Cary Coutant
2017-01-01 0:00 ` Rahul Chaudhry via gnu-gabi
[not found] ` <CAORpzuPYsSBJtypm3NDcfcgRzos3WO4JjkvgiqpyBYBhoqLVFA@mail.gmail.com>
2018-01-01 0:00 ` Florian Weimer
2017-01-01 0:00 ` Cary Coutant
2017-01-01 0:00 ` Rahul Chaudhry via gnu-gabi
2017-01-01 0:00 ` Rahul Chaudhry via gnu-gabi
2017-01-01 0:00 ` Ian Lance Taylor via gnu-gabi
2017-01-01 0:00 Sriraman Tallam
2017-01-01 0:00 ` H.J. Lu
2017-01-01 0:00 ` Sriraman Tallam
2017-01-01 0:00 ` Cary Coutant
2017-01-01 0:00 ` Florian Weimer
2017-01-01 0:00 ` Alan Modra
2017-01-01 0:00 ` Markus Trippelsdorf
2017-01-01 0:00 ` Sriraman Tallam
2017-01-01 0:00 ` H.J. Lu
2017-01-01 0:00 ` Rafael Espíndola
2017-01-01 0:00 ` Sriraman Tallam
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