cc generated code bug

[Andrew Koenig]

> When right-shifting an unsigned variable, the compiler generates an
> EXTZV instruction. If the shift count exceeds 32, a reserved operand
> fault occurs and the program gets an illegal instruction signal, instead
> of giving a null result.
> -- 
> 			Robbert van Renesse
> 			cogito at vu44.UUCP

This is not a bug.  K&R, page 189:  "The result [of a shift] is undefined
if the right operand is negative, or greater or equal to the length of
the object in bits."