re PR tree-optimization/52976 (Revision 186384 breaks the polyhedron tests aermod...

re PR tree-optimization/52976 (Revision 186384 breaks the polyhedron tests aermod.f90 and doduc.f90 at -O3 -ffast-math)

gcc:

2012-04-18  Bill Schmidt  <wschmidt@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  <wschmidt@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.

From-SVN: r186567