1 files changed, 39 insertions, 0 deletions

diff --git a/toolchain-layer/recipes-devtools/gcc/gcc-4.5/linaro/gcc-4.5-linaro-r99534.patch b/toolchain-layer/recipes-devtools/gcc/gcc-4.5/linaro/gcc-4.5-linaro-r99534.patch
new file mode 100644
index 0000000000..9fa6cf261c
--- /dev/null
+++ b/toolchain-layer/recipes-devtools/gcc/gcc-4.5/linaro/gcc-4.5-linaro-r99534.patch
@@ -0,0 +1,39 @@
+2011-08-09  Revital Eres  <revital.eres@linaro.org>
+
+        gcc/
+        Backport from trunk -r176972:
+
+        * 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.
+
+=== modified file 'gcc/ddg.c'
+--- old/gcc/ddg.c       2011-07-05 09:02:18 +0000
++++ new/gcc/ddg.c       2011-07-31 13:13:38 +0000
+@@ -197,11 +197,6 @@
+         }
+     }
+ 
+-  /* 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);
+@@ -305,8 +300,11 @@
+ 
+          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);
+ 
+