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Diffstat (limited to 'gcc/tree-ssa-dom.c')
| -rw-r--r-- | gcc/tree-ssa-dom.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c index 05bc807..663d07b 100644 --- a/gcc/tree-ssa-dom.c +++ b/gcc/tree-ssa-dom.c @@ -1126,6 +1126,12 @@ record_equivalences_from_phis (basic_block bb) t = dom_valueize (t); + /* If T is an SSA_NAME and its associated edge is a backedge, + then quit as we can not utilize this equivalence. */ + if (TREE_CODE (t) == SSA_NAME + && (gimple_phi_arg_edge (phi, i)->flags & EDGE_DFS_BACK)) + break; + /* If we have not processed an alternative yet, then set RHS to this alternative. */ if (rhs == NULL) |