Hi, the following trial patch fixed PR 48988 which is a regression.

Bootstrap and tested on x86/linux. Verified the reported failure is fixed.

Ok for trunk?

David


2011-05-22  David Li  <davidxl@google.com>

        PR tree-optimization/48988
        * tree-ssa-uninit.c (convert_control_dep_chain_into_preds):
        Initialize has_valid_pred for each pred chain.