[Bug target/23983] the altivec builtins should be marked as pure/const

[pinskia at gcc dot gnu dot org]

------- Comment #6 from pinskia at gcc dot gnu dot org  2008-03-12 19:17 -------
Note this patch does not fully work as it marks vec_mtvscr as being constant
which it is not.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23983