re PR tree-optimization/35164 (Unable to coalesce ab SSA_NAMEs)

2008-02-15  Richard Guenther  <rguenther@suse.de>
	Zdenek Dvorak  <ook@ucw.cz>

	PR tree-optimization/35164
	* tree-flow.h (stmt_references_abnormal_ssa_name): Declare.
	* tree-dfa.c (stmt_references_abnormal_ssa_name): New function.
	* tree-ssa-forwprop.c (tree_ssa_forward_propagate_single_use_vars):
	Only propagate addresses which do not have abnormal SSA_NAMEs
	in their operands.

	* g++.dg/torture/pr35164-1.C: New testcase.
	* g++.dg/torture/pr35164-2.C: Likewise.

Co-Authored-By: Zdenek Dvorak <ook@ucw.cz>

From-SVN: r132345