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Re: vararg calls with libffi on x86_64

From: Jan Hubicka <hubicka at ucw dot cz>
To: Andrew Haley <aph at redhat dot com>
Cc: Richard Henderson <rth at redhat dot com>,Andreas Degert <ad at papyrus-gmbh dot de>, gcc-patches at gcc dot gnu dot org
Date: Sat, 30 Apr 2005 13:05:32 +0200
Subject: Re: vararg calls with libffi on x86_64
References: <E1DRZei-0000Tc-00@pluto.noname> <17010.31036.654251.593520@cuddles.cambridge.redhat.com> <20050429232348.GD8858@redhat.com> <17011.20604.168547.273632@cuddles.cambridge.redhat.com>

> Richard Henderson writes:
>  > On Fri, Apr 29, 2005 at 07:13:16PM +0100, Andrew Haley wrote:
>  > > I agree.  It's very little extra overhead for the non-varargs case,
>  > > and it'll make varargs functions work.
>  > 
>  > Surely we can compute the correct value...
> 
> Sure, but is that reason to rejct the patch?  The value in %ax at the
> present time is garbage.

It will cause program that never initialize FPU unit since it never uses
FP to initialize it.  Not sure if this is actual problem with all the
lazy FPU initialization stuff in nowdays.

Honza
> 
> Andrew.

References:
- vararg calls with libffi on x86_64
  - From: Andreas Degert
- Re: vararg calls with libffi on x86_64
  - From: Andrew Haley
- Re: vararg calls with libffi on x86_64
  - From: Richard Henderson
- Re: vararg calls with libffi on x86_64
  - From: Andrew Haley

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