[Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction

[rearnsha at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49799

--- Comment #5 from Richard Earnshaw <rearnsha at gcc dot gnu.org> 2011-07-25 09:03:30 UTC ---
We should never generate a shift of -1.  Instead the code that does that should
return (clobber const_int 0).