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haifa-sched: Fix problems with cc0 in prune_ready_list


We found a scheduler problem while testing Coldfire targets. The
prune_ready_list function I introduced doesn't take SCHED_GROUPs into
account, which can lead to a random insn being scheduled between a cc0
setter and user. The patch below fixes it, OK? (Bootstrapped & tested
i686-linux).


Bernd

Attachment: hs-prunecc0.diff
Description: Text document


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