1d0ba4467d
The following testcase shows a problem in how we query valitity for equivalences on edges when the edge is a backedge and thus refering to a block thats later in the iteration order we use for VN. That causes the dominated_by_p_w_unex helper to look at edge executable state that's not yet computed and thus still at optimistic not executable state. The following makes sure to use a plain dominance check in these cases. PR tree-optimization/109342 * tree-ssa-sccvn.cc (vn_nary_op_get_predicated_value): New overload for edge. When that edge is a backedge use dominated_by_p directly. * g++.dg/torture/pr109342.C: New testcase. |
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