X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbepeephole.c;h=c8869dd630b72433246e0fa2eb445c19258b9a84;hb=184e8cad0c6e8b3cbe8ed9b28d372ad38a96df18;hp=25ec92282dce282b4ad405eb402ba961c12439d7;hpb=d4bbab11371a9c68aa2a716eaa7589b82a28691e;p=libfirm

diff --git a/ir/be/bepeephole.c b/ir/be/bepeephole.c
index 25ec92282..c8869dd63 100644
--- a/ir/be/bepeephole.c
+++ b/ir/be/bepeephole.c
@@ -23,9 +23,7 @@
  * @author      Matthias Braun
  * @version     $Id$
  */
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 
 #include "bepeephole.h"
 
@@ -300,8 +298,31 @@ static void	kill_barriers(ir_graph *irg) {
 	skip_barrier(start_blk, irg);
 }
 
+/**
+ * Check whether the node has only one user.  Explicitly ignore the anchor.
+ */
+static int has_only_one_user(ir_node *node)
+{
+	int              n = get_irn_n_edges(node);
+	const ir_edge_t *edge;
+
+	if (n <= 1)
+		return 1;
+
+	if (n > 2)
+		return 0;
+
+	foreach_out_edge(node, edge) {
+		ir_node *src = get_edge_src_irn(edge);
+		if (is_Anchor(src))
+			return 1;
+	}
+
+	return 0;
+}
+
 /*
- * Tries to optimize a beIncSp node with it's previous IncSP node.
+ * Tries to optimize a beIncSP node with its previous IncSP node.
  * Must be run from a be_peephole_opt() context.
  */
 ir_node *be_peephole_IncSP_IncSP(ir_node *node)
@@ -314,7 +335,7 @@ ir_node *be_peephole_IncSP_IncSP(ir_node *node)
 	if (!be_is_IncSP(pred))
 		return node;
 
-	if (get_irn_n_edges(pred) > 1)
+	if (!has_only_one_user(pred))
 		return node;
 
 	pred_offs = be_get_IncSP_offset(pred);
@@ -363,11 +384,11 @@ void be_peephole_opt(be_irg_t *birg)
 	lv       = be_get_birg_liveness(birg);
 
 	n_classes = arch_env_get_n_reg_class(arch_env);
-	register_values = alloca(sizeof(register_values[0]) * n_classes);
+	register_values = ALLOCAN(ir_node**, n_classes);
 	for(i = 0; i < n_classes; ++i) {
 		const arch_register_class_t *cls    = arch_env_get_reg_class(arch_env, i);
 		unsigned                     n_regs = arch_register_class_n_regs(cls);
-		register_values[i] = alloca(sizeof(ir_node*) * n_regs);
+		register_values[i] = ALLOCAN(ir_node*, n_regs);
 	}
 
 	irg_block_walk_graph(irg, process_block, NULL, NULL);