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Re: Proposed major change to combine
- To: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- Subject: Re: Proposed major change to combine
- From: Joern Rennecke <amylaar at cambridge dot redhat dot com>
- Date: Sat, 10 Mar 2001 05:25:22 +0000 (GMT)
- Cc: amylaar at cambridge dot redhat dot com, gcc at gcc dot gnu dot org
> I'm not sure this is a good idea, for precisely these reasons: it messes up
> the counting of instructions that combine does.
combine chokes on anything involving more than three insns. Moreover, a
lot of optimizations try to recognize insn, rather than go through the
expanders.