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[Bug tree-optimization/23821] [4.0/4.1/4.2/4.3 Regression] DOM and VRP creating harder to optimize code
- From: "pinskia at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 12 Jan 2008 12:26:39 -0000
- Subject: [Bug tree-optimization/23821] [4.0/4.1/4.2/4.3 Regression] DOM and VRP creating harder to optimize code
- References: <bug-23821-5077@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #16 from pinskia at gmail dot com 2008-01-12 12:26 -------
Subject: Re: [4.0/4.1/4.2/4.3 Regression] DOM and VRP creating harder to
optimize code
> ------- Comment #15 from rguenth at gcc dot gnu dot org 2008-01-12 10:49 -------
> I think symbolic substitutions should be only done if the resulting stmt can
> be simplified to a constant. Now for VRP my long-term plan is to get rid of
> symbolic ranges altogether to make it cheaper and easier to keep value-range
> information across passes.
Actually I think it is wrong to get rid of symbolic ranges. I have
filed a couple of bugs about adding more symbol ranges with respect of
VRP.
-- Pinski
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23821