[Bug fortran/57071] Optimize (-1)**k to 1 - 2 * mod(K, 2)

[tkoenig at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57071



--- Comment #8 from Thomas Koenig <tkoenig at gcc dot gnu.org> 2013-04-27 
23:19:13 UTC ---

While special-casing power, it might also make sense

to translate 2**n to ishft(1,n).