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Re: [patch] Fix behavior of TER on unrolled loops

From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
To: GCC Development <gcc at gcc dot gnu dot org>, Steven Bosscher <stevenb at suse dot de>
Date: Mon, 22 Aug 2005 09:28:16 +0200
Subject: Re: [patch] Fix behavior of TER on unrolled loops
References: <20050820190813.GA9852@atrey.karlin.mff.cuni.cz> <20050820200324.GA13103@atrey.karlin.mff.cuni.cz> <1124580306.6453.14.camel@linux.site> <200508210200.21548.stevenb@suse.de>

Maybe everyone else manages to get good code without something like
TER.

That's because we lack other things that people have, like a sane instruction selection and expression reordering pass: other compilers probably have something akin to TER as part of instruction selection. Like many other parts of GCC (right Steven? ;-) TER is not evil by itself -- it is as part of IR lowering.

I think Zdenek's patch is fine, because *everything* in TER is a hack.

Zdenek, maybe you could you try and see if enabling pre-regalloc
scheduling would also make this particular problem you're seeing go
away, just as an experiment...

Couldn't it also make it much worse?

Paolo

Follow-Ups:
- Re: [patch] Fix behavior of TER on unrolled loops
  - From: Steven Bosscher

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