The following patch solves the problem. The reason for the problem is
described on
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48367
The patch has been committed as obvious.
2011-03-30 Vladimir Makarov <vmaka...@redhat.com>
PR middle-end/48367
* ira-costs.c (find_costs_and_classes): Fix a typo in i_mem_cost
calculation.
Index: ira-costs.c
===================================================================
--- ira-costs.c (revision 171649)
+++ ira-costs.c (working copy)
@@ -1652,7 +1652,7 @@ find_costs_and_classes (FILE *dump_file)
i_costs[k] += add_cost;
}
add_cost = COSTS (costs, a_num)->mem_cost;
- if (add_cost && INT_MAX - add_cost < i_mem_cost)
+ if (add_cost > 0 && INT_MAX - add_cost < i_mem_cost)
i_mem_cost = INT_MAX;
else
i_mem_cost += add_cost;
@@ -1887,7 +1887,7 @@ process_bb_node_for_hard_reg_moves (ira_
ALLOCNO_HARD_REG_COSTS (a)[i] -= cost;
ALLOCNO_CONFLICT_HARD_REG_COSTS (a)[i] -= cost;
ALLOCNO_CLASS_COST (a) = MIN (ALLOCNO_CLASS_COST (a),
- ALLOCNO_HARD_REG_COSTS (a)[i]);
+ ALLOCNO_HARD_REG_COSTS (a)[i]);
}
}
