2011-06-07  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/46728
	* tree-ssa-math-opts.c (gimple_expand_builtin_pow): Change FIXME
	to use gimple_val_nonnegative_real_p.
	* gimple-fold.c (gimple_val_nonnegative_real_p): New function.
	* gimple.h (gimple_val_nonnegative_real_p): New declaration.

From-SVN: r174752