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Re: Recent changes to cse.c
- To: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- Subject: Re: Recent changes to cse.c
- From: law at redhat dot com
- Date: Wed, 25 Jul 2001 08:29:33 -0600
- cc: gcc at gcc dot gnu dot org
- Reply-To: law at redhat dot com
In message <10107251422.AA05118@vlsi1.ultra.nyu.edu>you write:
> Remember, scheduling happens before dbranch, so the compare and branch
> *must* be consecutive on a HAVE_cc0 target, no exceptions.
>
> That's what I said, but the point is that having them as separate
> insns tells more about how to schedule the *surrounding* insns. I
> admit it's not a major point, but it has the potential to save a cyle
> or two in some cases.
Actually, for the compare/branch case on a HAVE_cc0 machine, it doesn't have
that kind of potential. Think about it for a while and you'll see it doesn't
make a difference.
jeff