2008-04-03 Doug Kwan <dougkwan@google.com>

2008-04-03  Doug Kwan  <dougkwan@google.com>

	* tree-tailcall.c (struct tailcall): Remove call_block and replace
	call_bsi by call_gsi.
	(independent_of_stmt_p): Change type of parameter 'at' to GIMPLE and
	change all tree using code to GIMPLE using equivalent.
	Remove parameter block_stmt_iterator type parameter bsi with
	gimple_stmt_iterator type parameter gsi. Replace uses of bsi with
	that of gsi in function body as appropriate.
	(process_assignment):  Remove parameter 'ass' and change type of
	parameter 'stmt' to GIMPLE.  Change all tree using code to GIMPLE
	using equivalent.
	(propagate_through_phis, eliminate_tail_call, optimize_tail_call):
	Change all tree using code to GIMPLE using equivalent.
	(find_tail_calls): Change all tree using code to GIMPLE using
	equivalent.  Remove code that handles GIMPLE_MODIFY_STMT containing
	a CALL_EXPR.
	(add_successor_phi_arg, adjust_return_value_with_ops,
	update_accumulator_with_ops, adjust_accumulator_values,
	create_tailcall_accumulator): New functions from refactoring of
	duplicated logic.
	(adjust_accumulator_values, adjust_return_value): Refactor.
	(tree_optimize_tail_calls_1): Refactor and change all tree using code
	to GIMPLE using equivalent.  Remove code to reverse phi list.
	* passes.c (init_optimization_passes):  Re-enable pass_tail_recursion
	and pass_tail_calls.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gimple-tuples-branch@134112 138bc75d-0d04-0410-961f-82ee72b054a4