Am 28.04.2013 10:32, schrieb Thomas Koenig:
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?

OK - thanks for the patch.

I wonder whether one should also handle:
  1**k  == 1
That should only happen (in-real-world code) due to simplifying other expressions but it is simple to implement.

(0**k is also possible, but it gets more complicated: 0 for k > 0, 1 for k == 0 and invalid for k < 0 [which one might ignore]. As this is really special, one can also leave the library call.)

Tobias

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

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

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

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

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