PR tree-optimization/33920
        * tree-if-conv.c (tree_if_conversion): Force predicate of single
        successor bb to true when predecessor bb has NULL predicate.
        (find_phi_replacement_condition): Assert that tmp_cond is non-null.

testsuite/ChangeLog:

        PR tree-optimization/33920
        * gcc.dg/tree-ssa/pr33290.c: New test.

From-SVN: r129696