[patch, fortran] PR 57071, some power optimizations

[Thomas Koenig]

Hello world,

the attached patch does some optimization on
power using ishft and iand, as discussed in the PR.

I have left out handling real numbers, that should be left
to the middle-end (PR 57073).

Regression-tested.  OK for trunk?

	Thomas

2013-04-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/57071
         * frontend-passes (optimize_power):  New function.
         (optimize_op):  Use it.

2013-04-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/57071
         * gfortran.dg/power_3.f90:  New test.
         * gfortran.dg/power_4.f90:  New test.

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