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Re: Proposed major change to combine

To: Michael Meissner <meissner at cygnus dot com>
Subject: Re: Proposed major change to combine
From: Richard Henderson <rth at redhat dot com>
Date: Thu, 8 Mar 2001 21:07:19 -0800
Cc: Torbjorn Granlund <tege at swox dot com>, Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>, gcc at gcc dot gnu dot org
References: <10103081530.AA03373@vlsi1.ultra.nyu.edu> <86snko8ee2.fsf@king.swox.se> <20010308120309.A18094@cse.cygnus.com>

On Thu, Mar 08, 2001 at 12:03:09PM -0500, Michael Meissner wrote:
> > Whenever three insns are cheaper than two insns,
> > the three insns would be better.
> 
> But you can already do that with define_split.

No you can't.  Not within combine directly, anyway.  It'll 
notice that you're split generated too many insns and abort
the change.  The only way to do this sort of thing at the
moment is to define a fake combination insn and split it
after reload.

r~

References:
- Re: Proposed major change to combine
  - From: Richard Kenner
- Re: Proposed major change to combine
  - From: Torbjorn Granlund
- Re: Proposed major change to combine
  - From: Michael Meissner

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