2009-09-24  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/36143
	PR tree-optimization/38747
	* tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Only
	create VIEW_CONVERT_EXPRs for TBAA compatible accesses.

	* gcc.dg/tree-ssa/fre-vce-1.c: XFAIL.
	* gcc.dg/tree-ssa/forwprop-6.c: Likewise.
	* g++.dg/torture/pr38747.C: New testcase.
	* g++.dg/tree-ssa/pr19637.C: Un-XFAIL.

From-SVN: r152122