[Bug tree-optimization/21000] store should not be done if we don't change its value

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-07-17 
22:48 -------
PR 22538 is another testcase.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21000