re PR tree-optimization/17671 (PHI-OPT is not smart enough)

re PR tree-optimization/17671 (PHI-OPT is not smart enough)

2005-03-06  Andrew Pinski  <pinskia@physics.uc.edu>

	PR tree-opt/17671
	* tree-ssa-phiopt.c (tree_ssa_phiopt): Rewrite so we base the
	bbs on the COND_EXPR instead of the PHI_NODEs.
	(candidate_bb_for_phi_optimization): Remove.
	(replace_phi_with_stmt): Rename to ...
	(replace_phi_edge_with_variable): this and change so that we
	replace the phi argument instead of removing the PHI.
	(conditional_replacement): Change so we deal with PHI with more
	than two arguments.
	(value_replacement): Likewise.
	(abs_replacement): Likewise.

2005-03-06  Andrew Pinski  <pinskia@physics.uc.edu>

	PR tree-opt/17671
	* gcc.dg/tree-ssa/phi-opt-[1-4].c: New tests.

From-SVN: r96067