fix for pr47837

[Jeff Law]

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On 03/09/11 02:45, Richard Guenther wrote:
> On Tue, Mar 8, 2011 at 11:04 PM, Jeff Law <law@redhat.com> wrote:

> True.  I've been repeatedly thinking of building some on-the-side CFG
> with value-numbered predicates to also catch the CFG vs. scalar-code
> predicate combinations we have.  On such on-the-side data structure
> we could do very aggressive jump-threading just for analysis purposes
> (experiments when working on separating conditions shows that
> a PRE-like algorithm could drive this).
I'm pondering the same kind of thing.  PRE on the predicates with a more
structured approach to block copying to isolate the paths seems to be
the way to go.

jeff


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