2008-09-03 Vladimir Makarov <vmakarov@redhat.com>

2008-09-03  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-opt/37243

	* ira-conflicts.c (REG_SUBREG_P, go_through_subreg): New.
	(process_regs_for_copy): Process subregs.  Refine check when cost
	is taken into account in ira-costs.c.
	(process_reg_shuffles): Use REG_SUBREG_P.
	(add_insn_allocno_copies): Ditto.  Ignore modes.

	* ira-color.c (conflict_allocno_vec): New.
	(COST_HOP_DIVISOR): New macro.
	(update_copy_costs_1): Use it.
	(update_conflict_hard_regno_costs): New function.
	(assign_hard_reg): Use it.
	(ira_color): Allocate and free conflict_allocno_vec.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@139949 138bc75d-0d04-0410-961f-82ee72b054a4