[Bug tree-optimization/53986] missing vrp on bit-mask test, LSHIFT_EXPR not handled

[vries at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53986

--- Comment #2 from vries at gcc dot gnu.org 2012-07-23 06:29:51 UTC ---
> Btw, if the switch is not converted to a bit-test the path to link_error is
> also not removed by vrp, because it doesn't handle anti-ranges for switches

submitted patch for this:
http://gcc.gnu.org/ml/gcc-patches/2012-07/msg01056.html