initial checkin

a prototype of a struct and function to interface with the machine dependent
backend to yield an inverse operation for a given irn

diff --git a/ir/be/beinverse.h b/ir/be/beinverse.h
new file mode 100644 (file)
index 0000000..a12bcdd
--- /dev/null
+++ b/ir/be/beinverse.h
@@ -0,0 +1,32 @@
+/**
+ * Inverse operations
+ * @author Adam Szalkowski
+ * @date 2006-05-08
+ */
+
+#ifndef BE_INVERSE_H_
+#define BE_INVERSE_H_
+
+typedef struct be_inverse_t_ {
+  int        n;
+  int        costs;
+
+  /** nodes for this inverse operation. shall be in
+   *  schedule order. last element is the target value
+   */
+  ir_node  **nodes;
+} be_inverse_t;
+
+/**
+ * Returns an inverse operation which yields the i-th argument
+ * of the given node as result.
+ *
+ * @param irn       The original operation
+ * @param i         Index of the argument we want the inverse oparation to yield
+ * @param inverse   struct to be filled with the resulting inverse op
+ * @param obstack   The obstack to use for allocation of the returned nodes array
+ */
+be_inverse_t *
+be_get_inverse(ir_node * irn, int i, be_inverse_t * inverse, struct obstack * obstack);
+
+#endif