Simplify exponents of base 2 to bit shifts.
Simplify exponents of base 2 to bit shifts.

diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark