2010-03-03  Changpeng Fang  <changpeng.fang@amd.com>

      PR middle-end/43209
      * tree-ssa-loop-ivopts.c (determine_use_iv_cost_condition): Do not decrease
      the cost of an IV candidate when the cost is infinite.

      * gcc.dg/tree-ssa/ivopts-4.c: New.

From-SVN: r157217