re PR tree-optimization/48149 (Piecewise complex pass-through not optimized)

re PR tree-optimization/48149 (Piecewise complex pass-through not optimized)

2011-09-06  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/48149
	* tree-ssa-sccvn.c (vn_get_expr_for): Simplify.  Fix tuplification bug.
	(vn_valueize): Move earlier.
	(valueize_expr): Use vn_valueize.
	(simplify_binary_expression): Simplify, also combine COMPLEX_EXPR
	operands.
	(simplify_unary_expression): Simplify.

	* gcc.dg/tree-ssa/ssa-fre-32.c: New testcase.

From-SVN: r178597