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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/57071] Optimize  (-1)**k  to 1 - 2 * mod(K, 2)
Date: Sat, 27 Apr 2013 23:19:00 -0000
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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).