[Bug middle-end/31029] Fold does not fold C - a == a

[rguenth at gcc dot gnu dot org]

------- Comment #7 from rguenth at gcc dot gnu dot org  2008-11-02 18:23 -------
Actually we can fold C - a == a only for odd C.
But more generally a +- b == a to b == 0.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31029