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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);
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