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Re: x86-64 and large code model questions/bugs

From: Andi Kleen <andi at firstfloor dot org>
To: Paolo Bonzini <bonzini at gnu dot org>
Cc: Andi Kleen <andi at firstfloor dot org>, Steve Ellcey <sje at cup dot hp dot com>, gcc at gcc dot gnu dot org
Date: Wed, 28 Jan 2009 10:10:39 +0100
Subject: Re: x86-64 and large code model questions/bugs
References: <200901262226.n0QMQK824731@evrst7.cup.hp.com> <874ozlrnno.fsf@basil.nowhere.org> <1233077597.18651.11.camel@hpsje.cup.hp.com> <20090127182155.GC7533@one.firstfloor.org> <498019CB.30003@gnu.org>

On Wed, Jan 28, 2009 at 09:39:39AM +0100, Paolo Bonzini wrote:
> 
> > He'll get much better code by putting the program into a -fPIC .so,
> > loading it from a small stub and then unmap the stub.
> > large model generates really very bad code because all jumps
> > will be indirect.
> 
> Is it also true with -fpie?

Not sure what you mean?

AFAIK -fpie code is the same quality as -fPIC. Both
are much much better than large model.

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only.

Follow-Ups:
- Re: x86-64 and large code model questions/bugs
  - From: Paolo Bonzini

References:
- x86-64 and large code model questions/bugs
  - From: Steve Ellcey
- Re: x86-64 and large code model questions/bugs
  - From: Andi Kleen
- Re: x86-64 and large code model questions/bugs
  - From: Steve Ellcey
- Re: x86-64 and large code model questions/bugs
  - From: Andi Kleen
- Re: x86-64 and large code model questions/bugs
  - From: Paolo Bonzini

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