X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;ds=sidebyside;f=ir%2Fbe%2Fbepeephole.h;h=be93c224c8f499c1ec1701d7bb797ee9a8b4aa6b;hb=c6571686bfbfb3c87ae24ae1dc568e685d6cd49a;hp=19728434fd01d0ce98efc210209bfd7fad907f18;hpb=65a52a96e8ab7ed601d7f98c516d37c46b674b4a;p=libfirm

diff --git a/ir/be/bepeephole.h b/ir/be/bepeephole.h
index 19728434f..be93c224c 100644
--- a/ir/be/bepeephole.h
+++ b/ir/be/bepeephole.h
@@ -21,7 +21,6 @@
  * @file
  * @brief       peephole optimisation framework
  * @author      Matthias Braun
- * @version     $Id$
  */
 #ifndef BEPEEPHOLE_H
 #define BEPEEPHOLE_H
@@ -29,20 +28,17 @@
 #include "beirg.h"
 #include "bearch.h"
 
-extern ir_node ***register_values;
+extern ir_node **register_values;
 
-static inline ir_node *be_peephole_get_value(unsigned regclass_idx,
-                                             unsigned register_idx)
+static inline ir_node *be_peephole_get_value(unsigned register_idx)
 {
-	return register_values[regclass_idx][register_idx];
+	return register_values[register_idx];
 }
 
 static inline ir_node *be_peephole_get_reg_value(const arch_register_t *reg)
 {
-	unsigned regclass_idx = arch_register_class_index(arch_register_get_class(reg));
-	unsigned register_idx = arch_register_get_index(reg);
-
-	return be_peephole_get_value(regclass_idx, register_idx);
+	unsigned register_idx = reg->global_index;
+	return be_peephole_get_value(register_idx);
 }
 
 /**
@@ -53,7 +49,10 @@ typedef void (*peephole_opt_func) (ir_node *node);
 /**
  * Notify the peephole phase about a newly added node, so it can update its
  * internal state.  This is not needed for the new node, when
- * be_peephole_exchange() is used. */
+ * be_peephole_exchange() is used.
+ * Note: Contrary to normal exchange you mustn't remove the node from the
+ * schedule either before exchange. Exchange will do that for you.
+ */
 void be_peephole_new_node(ir_node *nw);
 
 /**
@@ -62,7 +61,7 @@ void be_peephole_new_node(ir_node *nw);
 void be_peephole_exchange(ir_node *old, ir_node *nw);
 
 /**
- * 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.
  *
  * @param node  a be_IncSP node
@@ -71,6 +70,19 @@ void be_peephole_exchange(ir_node *old, ir_node *nw);
  */
 ir_node *be_peephole_IncSP_IncSP(ir_node *node);
 
+bool be_has_only_one_user(ir_node *node);
+
+/**
+ * In a scheduled program with registers assigned,
+ * checks wether @p node can be moved before @p before without changing program
+ * semantics.
+ *
+ * Note: It is allowed to use this function without being in a peephole
+ * optimization phase.
+ */
+bool be_can_move_before(ir_heights_t *heights, const ir_node *node,
+                        const ir_node *before);
+
 /**
  * Do peephole optimisations. It traverses the schedule of all blocks in
  * backward direction. The register_values variable indicates which (live)