[Bug optimization/14792] [tree-ssa] cast elimination opportunity involving an AND

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-03-31 05:40 -------
On PPC here is why this code is not optimial:
_foo:
        lbz r4,0(r3)
        extsb r0,r4   <--- extra extends byte
        rlwinm r2,r0,0,31,31  <-- as this is just an and 1 (trust me)
        cmpwi cr7,r2,0
        beqlr- cr7
        bnelr- cr7
        b _link_error

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14792