From: Revital Eres <revital.eres@linaro.org>
Date: Sun, 31 Jul 2011 10:37:35 +0000 (+0000)
Subject: Move the creation of anti-dep edge
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=dcaac07dbf07815294d7f8b1568ef9e157b57dae;p=gcc.git

Move the creation of anti-dep edge

From-SVN: r176972
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5372f24cb4e..c10b1e0ade9 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2011-07-31  Revital Eres  <revital.eres@linaro.org>
+
+	* ddg.c (create_ddg_dep_from_intra_loop_link): Remove the creation
+	of anti-dep edge from a branch.
+	(add_cross_iteration_register_deps): Create anti-dep edge from
+	a branch.
+
 2011-07-31  Revital Eres  <revital.eres@linaro.org>
 
 	* modulo-sched.c: Change comment.
diff --git a/gcc/ddg.c b/gcc/ddg.c
index d06bdbb5448..856fa4e6800 100644
--- a/gcc/ddg.c
+++ b/gcc/ddg.c
@@ -197,11 +197,6 @@ 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);
@@ -306,8 +301,11 @@ add_cross_iteration_register_deps (ddg_ptr g, df_ref last_def)
 
 	  gcc_assert (first_def_node);
 
+         /* Always create the edge if the use node is a branch in
+            order to prevent the creation of reg-moves.  */
           if (DF_REF_ID (last_def) != DF_REF_ID (first_def)
-              || !flag_modulo_sched_allow_regmoves)
+              || !flag_modulo_sched_allow_regmoves
+	      || JUMP_P (use_node->insn))
             create_ddg_dep_no_link (g, use_node, first_def_node, ANTI_DEP,
                                     REG_DEP, 1);