[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 #7 from Richard Earnshaw <rearnsha at gcc dot gnu.org> 2011-07-25 
09:45:51 UTC ---
No, you miss the point.

Internally we must not generate (ashift (reg) (const_int)) where the const is
negative.

Note that your testcasegenerates a reg shift.