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Re: [RFC] Contributing tree-ssa to mainline
- From: Joe Buck <Joe dot Buck at synopsys dot COM>
- To: Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>
- Cc: s dot bosscher at student dot tudelft dot nl, gcc at gcc dot gnu dot org
- Date: Mon, 19 Jan 2004 15:30:26 -0800
- Subject: Re: [RFC] Contributing tree-ssa to mainline
- References: <10401170324.AA15949@vlsi1.ultra.nyu.edu>
On Fri, Jan 16, 2004 at 10:24:08PM -0500, Richard Kenner wrote:
> Expecting tree-ssa to produce code better by a factor of two is simply
> unreasonable.
>
> In general, of course. But if it is really allowing new classes of
> optimizations to be performed (which was the argument to justify the new
> infrastructure), it should be possible to construct test cases that show
> that sort of performance improvement (factors of two or more).
There are certain cases where tree-ssa *already* produces better code by a
factor of two or more. See, for example PR 12747.