[Bug middle-end/4520] cselib.c hash_rtx incorrectly hashes based on rtx address

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-01-13 00:59 -------
Also if we use the address we more likely to have an unstable hastable in we can get a miscompare if 
we get different address across compilination.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=4520