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Re: Fix PRE heuristic for partial insertions


On Thu, Nov 15, 2012 at 4:45 PM, Jakub Jelinek wrote:
> On Thu, Nov 15, 2012 at 11:25:55AM +0100, Jan Hubicka wrote:
>>       PR tree-optimization/54717
>>       * tree-ssa-pre.c (do_partial_partial_insertion): Consider also edges
>>       with ANTIC_IN.
>
> As Richard is still away, Steven, could you please comment on this?

I'm not very familiar with the partial-partial bits of PRE but Honza's
fix makes sense after glancing at how PA_IN is computed: ANTIC_IN is
filtered, so the set of partially or fully anticipated values in the
successor block is PA_IN U ANTIC_IN and we should look in both sets.

Ciao!
Steven


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