gcc/

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

diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c
index ac676cd..816aeb6 100644 (file)
--- a/gcc/tree-ssa-pre.c
+++ b/gcc/tree-ssa-pre.c
@@ -4347,6 +4347,10 @@ eliminate (void)
 
          remove_phi_node (&gsi, false);
 
+         if (!bitmap_bit_p (inserted_exprs, SSA_NAME_VERSION (res))
+             && TREE_CODE (sprime) == SSA_NAME)
+           gimple_set_plf (SSA_NAME_DEF_STMT (sprime), NECESSARY, true);
+
          if (!useless_type_conversion_p (TREE_TYPE (res), TREE_TYPE (sprime)))
            sprime = fold_convert (TREE_TYPE (res), sprime);
          stmt = gimple_build_assign (res, sprime);