re PR tree-optimization/64410 (gcc 25% slower than clang 3.5 for adding complex numbers)

re PR tree-optimization/64410 (gcc 25% slower than clang 3.5 for adding complex numbers)

2015-01-09  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/64410
	* tree-ssa.c (non_rewritable_lvalue_p): Allow REALPART/IMAGPART_EXPR
	on the LHS.
	(execute_update_addresses_taken): Deal with that.
	* tree-ssa-forwprop.c (pass_forwprop::execute): Use component-wise
	loads/stores for complex variables.

	* g++.dg/vect/pr64410.cc: New testcase.

From-SVN: r219380