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Re: still using frame pointer when compiling with -fomit-frame-pointer

From: Richard Henderson <rth at redhat dot com>
To: Johan Rydberg <jrydberg at night dot trouble dot net>
Cc: gcc at gcc dot gnu dot org
Date: Wed, 2 Jul 2003 14:37:07 -0700
Subject: Re: still using frame pointer when compiling with -fomit-frame-pointer
References: <20030702182905.5c986fbc.jrydberg@night.trouble.net> <20030702182630.GC1914@redhat.com> <20030702203727.7c063c4a.jrydberg@night.trouble.net>

On Wed, Jul 02, 2003 at 08:37:27PM +0200, Johan Rydberg wrote:
> Look at that.  Okey.  Is there anyway to tell the compiler that
> %ebp is not still alive?

No.

The other thing is that while -fomit-frame-pointer prevents a frame pointer
from being used in all functions, it does not say "never use a frame pointer".
There is no way to say that.  There are certain situations where correct code
generation *requires* a frame pointer.

r~

References:
- still using frame pointer when compiling with -fomit-frame-pointer
  - From: Johan Rydberg
- Re: still using frame pointer when compiling with -fomit-frame-pointer
  - From: Richard Henderson
- Re: still using frame pointer when compiling with-fomit-frame-pointer
  - From: Johan Rydberg

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