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Re: [patches] flow based jump pass take 2

To: Jan Hubicka <jh at suse dot cz>
Subject: Re: [patches] flow based jump pass take 2
From: Richard Henderson <rth at redhat dot com>
Date: Thu, 28 Jun 2001 12:11:25 -0700
Cc: patches at x86-64 dot org, gcc-patches at gcc dot gnu dot org
References: <20010628113830.D4964@atrey.karlin.mff.cuni.cz> <20010628115354.F4964@atrey.karlin.mff.cuni.cz>

On Thu, Jun 28, 2001 at 11:53:54AM +0200, Jan Hubicka wrote:
> !       if (target != first && counter < n_basic_blocks
> ! 	  && redirect_edge_and_branch (e, target))

One thing we could do better here is handle cases like

	A
	|
	B
	|
	C<-
	\_/

and

	A<-
	| |
	B |
	\_/

which should both be reduced to a single infinite loop.

Something to think about...


r~

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