beloopana: Remove duplicate comments.

[libfirm] / ir / ana / cdep.c

diff --git a/ir/ana/cdep.c b/ir/ana/cdep.c
index 4487782..98e24da 100644 (file)
--- a/ir/ana/cdep.c
+++ b/ir/ana/cdep.c
@@ -1,20 +1,6 @@
 /*
- * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
- *
  * This file is part of libFirm.
- *
- * This file may be distributed and/or modified under the terms of the
- * GNU General Public License version 2 as published by the Free Software
- * Foundation and appearing in the file LICENSE.GPL included in the
- * packaging of this file.
- *
- * Licensees holding valid libFirm Professional Edition licenses may use
- * this file in accordance with the libFirm Commercial License.
- * Agreement provided with the Software.
- *
- * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
- * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE.
+ * Copyright (C) 2012 University of Karlsruhe.
  */
 
 /**
@@ -94,26 +80,14 @@ static void add_cdep(ir_node *node, ir_node *dep_on)
        }
 }
 
-typedef struct cdep_env {
-       ir_node *start_block;
-       ir_node *end_block;
-} cdep_env;
-
 /**
  * Pre-block-walker: calculate the control dependence
  */
 static void cdep_pre(ir_node *node, void *ctx)
 {
-       cdep_env *env = (cdep_env*) ctx;
-       int i;
-
-       /* special case:
-        * start and end block have no control dependency
-        */
-       if (node == env->start_block) return;
-       if (node == env->end_block) return;
+       (void)ctx;
 
-       for (i = get_Block_n_cfgpreds(node) - 1; i >= 0; --i) {
+       for (int i = get_Block_n_cfgpreds(node); i-- != 0;) {
                ir_node *pred = get_Block_cfgpred_block(node, i);
                ir_node *pdom;
                ir_node *dependee;
@@ -150,9 +124,6 @@ static int cdep_edge_hook(FILE *F, ir_node *block)
 
 void compute_cdep(ir_graph *irg)
 {
-       ir_node *rem;
-       cdep_env env;
-
        free_cdep(irg);
        cdep_data = XMALLOC(cdep_info);
        obstack_init(&cdep_data->obst);
@@ -165,18 +136,17 @@ void compute_cdep(ir_graph *irg)
           the ipdom of the startblock is the end block.
           Firm does NOT add the phantom edge from Start to End.
         */
-       env.start_block = get_irg_start_block(irg);
-       env.end_block   = get_irg_end_block(irg);
-
-       rem = get_Block_ipostdom(env.start_block);
-       set_Block_ipostdom(env.start_block, env.end_block);
+       ir_node *const start_block = get_irg_start_block(irg);
+       ir_node *const end_block   = get_irg_end_block(irg);
+       ir_node *const rem         = get_Block_ipostdom(start_block);
+       set_Block_ipostdom(start_block, end_block);
 
-       irg_block_walk_graph(irg, cdep_pre, NULL, &env);
+       irg_block_walk_graph(irg, cdep_pre, NULL, NULL);
 
        (void) cdep_edge_hook;
 
        /* restore the post dominator relation */
-       set_Block_ipostdom(env.start_block, rem);
+       set_Block_ipostdom(start_block, rem);
 }
 
 void free_cdep(ir_graph *irg)