Support closing_branch_deps

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@173654 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 5 insertions, 0 deletions

diff --git a/gcc/ddg.c b/gcc/ddg.c
index 4543ba7d170..b8ae375f153 100644
--- a/gcc/ddg.c
+++ b/gcc/ddg.c
@@ -197,6 +197,11 @@ create_ddg_dep_from_intra_loop_link (ddg_ptr g, ddg_node_ptr src_node,
         }
     }
 
+  /* If a true dep edge enters the branch create an anti edge in the
+     opposite direction to prevent the creation of reg-moves.  */
+  if ((DEP_TYPE (link) == REG_DEP_TRUE) && JUMP_P (dest_node->insn))
+    create_ddg_dep_no_link (g, dest_node, src_node, ANTI_DEP, REG_DEP, 1);
+
    latency = dep_cost (link);
    e = create_ddg_edge (src_node, dest_node, t, dt, latency, distance);
    add_edge_to_ddg (g, e);