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Re: Why doesn't -fomit-frame-pointer work(very well)?

From: Richard Henderson <rth at redhat dot com>
To: Peter Barada <pbarada at mail dot wm dot sps dot mot dot com>
Cc: Peter dot Barada at motorola dot com, gcc at gcc dot gnu dot org
Date: Wed, 3 Apr 2002 15:06:35 -0800
Subject: Re: Why doesn't -fomit-frame-pointer work(very well)?
References: <200204011801.g31I10310322@hyper.wm.sps.mot.com> <20020401105837.A27829@redhat.com> <200204022018.g32KIUN04999@hyper.wm.sps.mot.com> <20020402123749.H28833@redhat.com> <200204031925.g33JP9l05804@hyper.wm.sps.mot.com> <20020403131846.B30156@redhat.com> <200204032301.g33N1eN14935@hyper.wm.sps.mot.com>

On Wed, Apr 03, 2002 at 06:01:40PM -0500, Peter Barada wrote:
> So it looks like it tried to eliminate the frame pointer and then
> failed.

Hum.  I suspect that reload doesn't like %sp being modifed
and used within the same insn.  In fact, IIRC this is illegal
on ARM, so there may well be code in there to prevent this.

r~

Follow-Ups:
- Re: Why doesn't -fomit-frame-pointer work(very well)?
  - From: Peter Barada

References:
- Why doesn't -fomit-frame-pointer work(very well)?
  - From: Peter Barada
- Re: Why doesn't -fomit-frame-pointer work(very well)?
  - From: Richard Henderson
- Re: Why doesn't -fomit-frame-pointer work(very well)?
  - From: Peter Barada
- Re: Why doesn't -fomit-frame-pointer work(very well)?
  - From: Richard Henderson
- Re: Why doesn't -fomit-frame-pointer work(very well)?
  - From: Peter Barada
- Re: Why doesn't -fomit-frame-pointer work(very well)?
  - From: Richard Henderson
- Re: Why doesn't -fomit-frame-pointer work(very well)?
  - From: Peter Barada

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