PR tree-optimization/35085

[pf3gnuchains/gcc-fork.git] / gcc / tree-ssa-reassoc.c

diff --git a/gcc/tree-ssa-reassoc.c b/gcc/tree-ssa-reassoc.c
index 200088d..a4118c9 100644 (file)
--- a/gcc/tree-ssa-reassoc.c
+++ b/gcc/tree-ssa-reassoc.c
@@ -857,6 +857,18 @@ rewrite_expr_tree (tree stmt, unsigned int opindex,
          oe1->op = temp.op;
          oe1->rank= temp.rank;
        }
+      else if ((oe1->rank == oe3->rank
+               && oe2->rank != oe3->rank)
+              || (is_phi_for_stmt (stmt, oe2->op)
+                  && !is_phi_for_stmt (stmt, oe1->op)
+                  && !is_phi_for_stmt (stmt, oe3->op)))
+       {
+         struct operand_entry temp = *oe2;
+         oe2->op = oe1->op;
+         oe2->rank = oe1->rank;
+         oe1->op = temp.op;
+         oe1->rank= temp.rank;
+       }
     }
 
   /* The final recursion case for this function is that you have