normalize/fix ProjM numbers, avoid dead code in some instances

[libfirm] / ir / adt / hungarian.c

diff --git a/ir/adt/hungarian.c b/ir/adt/hungarian.c
index bbb8590..05910a9 100644 (file)
--- a/ir/adt/hungarian.c
+++ b/ir/adt/hungarian.c
@@ -24,7 +24,14 @@
  ********************************************************************
  ********************************************************************/
 
-/* $Id$ */
+/**
+ * @file
+ * @brief   Solving the Minimum Assignment Problem using the Hungarian Method.
+ * @version $Id$
+ */
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -84,7 +91,7 @@ hungarian_problem_t *hungarian_new(int rows, int cols, int width, int match_type
        int i;
        hungarian_problem_t *p = xmalloc(sizeof(*p));
 
-       memset(p, 0, sizeof(p));
+       memset(p, 0, sizeof(p[0]));
 
        FIRM_DBG_REGISTER(p->dbg, "firm.hungarian");
 
@@ -148,6 +155,7 @@ void hungarian_prepare_cost_matrix(hungarian_problem_t *p, int mode) {
 void hungarian_add(hungarian_problem_t *p, int left, int right, int cost) {
        assert(p->num_rows > left  && "Invalid row selected.");
        assert(p->num_cols > right && "Invalid column selected.");
+       assert(cost >= 0);
 
        p->cost[left][right] = cost;
        p->max_cost          = MAX(p->max_cost, cost);
@@ -184,7 +192,7 @@ void hungarian_free(hungarian_problem_t* p) {
 /**
  * Do the assignment.
  */
-int hungarian_solve(hungarian_problem_t* p, int *assignment, int *final_cost) {
+int hungarian_solve(hungarian_problem_t* p, int *assignment, int *final_cost, int cost_threshold) {
        int i, j, m, n, k, l, s, t, q, unmatched, cost;
        int *col_mate;
        int *row_mate;
@@ -408,7 +416,10 @@ done:
 
        /* collect the assigned values */
        for (i = 0; i < m; ++i) {
-               assignment[i] = col_mate[i];
+               if (cost_threshold > 0 && p->cost[i][col_mate[i]] >= cost_threshold)
+                       assignment[i] = -1; /* remove matching having cost > threshold */
+               else
+                       assignment[i] = col_mate[i];
        }
 
        /* In case of normal matching: remove impossible ones */