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Re: fix m68k-linux bootstrap (PR9093)

From: Richard Henderson <rth at redhat dot com>
To: Roman Zippel <zippel at linux-m68k dot org>
Cc: gcc-patches at gcc dot gnu dot org, Jan Hubicka <jh at suse dot cz>
Date: Wed, 12 Feb 2003 16:32:33 -0800
Subject: Re: fix m68k-linux bootstrap (PR9093)
References: <Pine.LNX.4.44.0302032349110.1336-100000@serv> <20030204225258.GD15669@redhat.com> <Pine.LNX.4.44.0302050101530.1336-100000@serv> <20030205211954.GC19935@redhat.com> <Pine.LNX.4.44.0302060030270.1336-100000@serv> <20030206010627.GA27648@redhat.com> <Pine.LNX.4.44.0302122356210.1336-100000@serv>

On Wed, Feb 12, 2003 at 11:58:22PM +0100, Roman Zippel wrote:
> I'm curious, why isn't it possible to add this logic directly to 
> find_used_regs?

Because the register is *used* by the PRE_DEC.  If we're
trying to determine reachability (e.g. for dead code) then
failing to report the use will result in bad code.

r~

References:
- fix m68k-linux bootstrap (PR9093)
  - From: Roman Zippel
- Re: fix m68k-linux bootstrap (PR9093)
  - From: Richard Henderson
- Re: fix m68k-linux bootstrap (PR9093)
  - From: Roman Zippel
- Re: fix m68k-linux bootstrap (PR9093)
  - From: Richard Henderson
- Re: fix m68k-linux bootstrap (PR9093)
  - From: Roman Zippel
- Re: fix m68k-linux bootstrap (PR9093)
  - From: Richard Henderson
- Re: fix m68k-linux bootstrap (PR9093)
  - From: Roman Zippel

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