tree.def (BIT_FIELD_REF): Constrain result type and its precision.

tree.def (BIT_FIELD_REF): Constrain result type and its precision.

2008-03-06  Richard Guenther  <rguenther@suse.de>

	* tree.def (BIT_FIELD_REF): Constrain result type and its precision.
	* tree-cfg.c (verify_expr): Verify BIT_FIELD_REF constraints on
	result type and precision.
	* expr.c (get_inner_reference): Set unsignedp based on the result
	type of BIT_FIELD_REF.
	* tree.h (BIT_FIELD_REF_UNSIGNED): Remove.
	* tree-sra.c (instantiate_element): Do not set BIT_FIELD_REF_UNSIGNED.
	(try_instantiate_multiple_fields): Likewise.  Use the correct type
	for BIT_FIELD_REF.
	(sra_build_assignment): Likewise.
	(sra_build_elt_assignment): Likewise.
	(sra_explode_bitfield_assignment): Likewise.
	* print-tree.c (print_node): Do not check BIT_FIELD_REF_UNSIGNED.
	* tree-vect-transform.c (vect_create_epilog_for_reduction): Do not
	set BIT_FIELD_REF_UNSIGNED.
	(vectorizable_load): Likewise.

From-SVN: r132969