re PR tree-optimization/46728 (GCC does not generate fmadd for pow (x, 0.75)+y on...

re PR tree-optimization/46728 (GCC does not generate fmadd for pow (x, 0.75)+y on powerpc)

2011-05-27  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/46728
	* tree-ssa-math-opts.c (powi_as_mults_1): Add gimple_set_location.
	(powi_as_mults): Add gimple_set_location.
	(build_and_insert_call): New.
	(gimple_expand_builtin_pow): Add handling for pow(x,y) when y is
	0.5, 0.25, 0.75, 1./3., or 1./6.

From-SVN: r174349