[Bug tree-optimization/52976] [4.8 Regression] Revision 186384 breaks the polyhedron tests aermod.f90 and doduc.f90 at -O3 -ffast-math

[wschmidt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52976

--- Comment #16 from William J. Schmidt <wschmidt at gcc dot gnu.org> 
2012-04-18 12:25:30 UTC ---
Author: wschmidt
Date: Wed Apr 18 12:25:17 2012
New Revision: 186567

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186567
Log:
gcc:

2012-04-18  Bill Schmidt  <wschm...@linux.vnet.ibm.com>

    PR tree-optimization/52976
    * tree-ssa-reassoc.c (stmt_is_power_of_op): New function.
    (decrement_power): Likewise.
    (propagate_op_to_single_use): Likewise.
    (zero_one_operation): Handle __builtin_pow* calls in linearized
    expression trees; factor logic into propagate_op_to_single_use.
    (undistribute_ops_list): Allow operands with repeat counts > 1.


gcc/testsuite:

2012-04-18  Bill Schmidt  <wschm...@linux.vnet.ibm.com>

    PR tree-optimization/52976
    gfortran.dg/reassoc_7.f: New test.
    gfortran.dg/reassoc_8.f: Likewise.
    gfortran.dg/reassoc_9.f: Likewise.
    gfortran.dg/reassoc_10.f: Likewise.

Added:
    trunk/gcc/testsuite/gfortran.dg/reassoc_10.f
    trunk/gcc/testsuite/gfortran.dg/reassoc_7.f
    trunk/gcc/testsuite/gfortran.dg/reassoc_8.f
    trunk/gcc/testsuite/gfortran.dg/reassoc_9.f
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-reassoc.c