PR c/20187

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

diff --git a/gcc/tree-ssa-loop.c b/gcc/tree-ssa-loop.c
index aa99920..abfcf15 100644 (file)
--- a/gcc/tree-ssa-loop.c
+++ b/gcc/tree-ssa-loop.c
@@ -61,15 +61,15 @@ tree_loop_optimizer_init (FILE *dump)
 /* The loop superpass.  */
 
 static bool
-gate_loop (void)
+gate_tree_loop (void)
 {
   return flag_tree_loop_optimize != 0;
 }
 
-struct tree_opt_pass pass_loop = 
+struct tree_opt_pass pass_tree_loop = 
 {
   "loop",                              /* name */
-  gate_loop,                           /* gate */
+  gate_tree_loop,                      /* gate */
   NULL,                                        /* execute */
   NULL,                                        /* sub */
   NULL,                                        /* next */
@@ -98,7 +98,7 @@ tree_ssa_loop_init (void)
   scev_initialize (current_loops);
 }
   
-struct tree_opt_pass pass_loop_init = 
+struct tree_opt_pass pass_tree_loop_init = 
 {
   "loopinit",                          /* name */
   NULL,                                        /* gate */
@@ -166,7 +166,7 @@ gate_tree_ssa_loop_unswitch (void)
   return flag_unswitch_loops != 0;
 }
 
-struct tree_opt_pass pass_unswitch = 
+struct tree_opt_pass pass_tree_unswitch = 
 {
   "unswitch",                          /* name */
   gate_tree_ssa_loop_unswitch,         /* gate */
@@ -311,6 +311,34 @@ struct tree_opt_pass pass_scev_cprop =
   0                                    /* letter */
 };
 
+/* Remove empty loops.  */
+
+static void
+tree_ssa_empty_loop (void)
+{
+  if (!current_loops)
+    return;
+
+  remove_empty_loops (current_loops);
+}
+
+struct tree_opt_pass pass_empty_loop =
+{
+  "empty",                             /* name */
+  NULL,                                        /* gate */
+  tree_ssa_empty_loop,                 /* execute */
+  NULL,                                        /* sub */
+  NULL,                                        /* next */
+  0,                                   /* static_pass_number */
+  TV_COMPLETE_UNROLL,                  /* tv_id */
+  PROP_cfg | PROP_ssa,                 /* properties_required */
+  0,                                   /* properties_provided */
+  0,                                   /* properties_destroyed */
+  0,                                   /* todo_flags_start */
+  TODO_dump_func | TODO_verify_loops,  /* todo_flags_finish */
+  0                                    /* letter */
+};
+
 /* Record bounds on numbers of iterations of loops.  */
 
 static void
@@ -426,7 +454,7 @@ tree_ssa_loop_done (void)
   current_loops = NULL;
 }
   
-struct tree_opt_pass pass_loop_done = 
+struct tree_opt_pass pass_tree_loop_done = 
 {
   "loopdone",                          /* name */
   NULL,                                        /* gate */