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Re: [tree-ssa] cfg.texi needs reviewing by a native speaker (Was: Re: "Documentation by paper")
- From: Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>
- To: Jan Hubicka <jh at suse dot cz>
- Cc: law at redhat dot com, Jan Hubicka <hubicka at ucw dot cz>,Steven Bosscher <stevenb at suse dot de>, Robert Dewar <dewar at gnat dot com>,Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>, gcc-patches at gcc dot gnu dot org,dnovillo at redhat dot com
- Date: Tue, 10 Feb 2004 01:37:35 +0100
- Subject: Re: [tree-ssa] cfg.texi needs reviewing by a native speaker (Was: Re: "Documentation by paper")
- References: <20040209231001.GQ20341@kam.mff.cuni.cz>
Hello,
> > > and also know that copied loop headers
> > Well, the tree-ssa branch copies loop headers quite effectivel now.
>
> Yes and it still use the old code that does:
> predict_insn_def (copy, PRED_LOOP_HEADER, TAKEN);
> so it is recorded that unlike normal conditionals, this conditional will
> usually be true. I guess current tree-ssa is on the safe ground here.
> Zdenek mentioned this to be one of problems when you move to new loop
> copying that can't pass this info around. It can be one of reasons why
> moving the loop header copying around from RTLopt branch broke things
> even more.
no -- rtlopt branch loop header copying gets it right; this problem
might arise when adding the loop header copying on tree level, since
there is currently no way how to get the prediction to the rtl level.
Zdenek