X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbeuses.h;h=c0c6d789f0e7b083ed1453da9ad70e49071cbb5f;hb=b36dd117b8e841f1a3c78588036aed050ffd94e4;hp=68f4b57f51eb726b40c901c7f08e226bc4c20ecd;hpb=0c92b911be3d9d02b4a49b2a142dab8d7ba978a6;p=libfirm

diff --git a/ir/be/beuses.h b/ir/be/beuses.h
index 68f4b57f5..c0c6d789f 100644
--- a/ir/be/beuses.h
+++ b/ir/be/beuses.h
@@ -1,39 +1,61 @@
+/*
+ * This file is part of libFirm.
+ * Copyright (C) 2012 University of Karlsruhe.
+ */
+
 /**
- * @file   beuse.h
- * @date   27.06.2005
- * @author Sebastian Hack, Matthias Braun
- *
- * Determine future usages of values.
- *
- * Copyright (C) 2005 Universitaet Karlsruhe
- * Released under the GPL
+ * @file
+ * @brief       Methods to compute when a value will be used again.
+ * @author      Sebastian Hack, Matthias Braun
+ * @date        27.06.2005
  */
-#ifndef _BEUSES_H
-#define _BEUSES_H
+#ifndef FIRM_BE_BEUSES_H
+#define FIRM_BE_BEUSES_H
 
-#include "bearch.h"
+#include "firm_types.h"
 #include "belive.h"
 
-typedef struct _be_next_use_t {
-	unsigned time;
-	int outermost_loop;
+/**
+ * Describes a use of a value.
+ */
+typedef struct be_next_use_t {
+	unsigned       time;
+	unsigned       outermost_loop;
+	/* point of the next use is at the beginning of this node. */
+	const ir_node *before;
 } be_next_use_t;
 
-#define USES_INFINITY                 10000000
+#define USES_INFINITY  10000000
+#define USES_PENDING   9999999
 
-static INLINE int USES_IS_INFINITE(unsigned time)
+static inline bool USES_IS_INFINITE(unsigned time)
 {
 	return time >= USES_INFINITY;
 }
 
-typedef struct _be_uses_t be_uses_t;
+static inline bool USES_IS_PENDING(unsigned time)
+{
+	return time == USES_PENDING;
+}
+
+typedef struct be_uses_t be_uses_t;
 
 be_next_use_t be_get_next_use(be_uses_t *uses, ir_node *from,
-                         unsigned from_step, const ir_node *def,
-                         int skip_from_uses);
+                              const ir_node *def, int skip_from_uses);
 
+/**
+ * Creates a new uses environment for a graph.
+ *
+ * @param irg  the graph
+ * @param lv   liveness information for the graph
+ */
 be_uses_t *be_begin_uses(ir_graph *irg, const be_lv_t *lv);
 
+/**
+ * Destroys the given uses environment.
+ *
+ * @param uses  the environment
+ */
 void be_end_uses(be_uses_t *uses);
 
-#endif /* _BEUSES_H */
+#endif