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Re: patch for killing cc0 users
- To: Joern Rennecke <amylaar at cygnus dot co dot uk>, Richard Henderson <rth at cygnus dot com>
- Subject: Re: patch for killing cc0 users
- From: Richard Henderson <rth at cygnus dot com>
- Date: Sat, 19 Sep 1998 12:02:03 -0700
- Cc: egcs at cygnus dot com
- References: <199809171121.MAA08155@phal.cygnus.co.uk>
- Reply-To: Richard Henderson <rth at cygnus dot com>
On Thu, Sep 17, 1998 at 12:21:33PM +0100, Joern Rennecke wrote:
> I think we get better code if we put a REG_UNUSED note for cc0 on the
> cc0 setter (or is it already there?), and not consider this insn
> a cc0 setter that has to have a matching cc0 user anymore.
One might argue that there is in fact one bug (in reg-stack)
and one missed optimization (in combine).
However, I expect the situation in which combine cannot also remove the
cc0 setter to happen basically never. I've no idea how I would go about
tracking down other potential cc0 mismatches, so I thought it best to
just let it be.
r~