2013-10-09 Andreas Krebbel <Andreas.Krebbel@de.ibm.com>

2013-10-09  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* config/s390/s390.c (struct s390_frame_layout): New field
	gpr_save_slots.
	(cfun_save_arg_fprs_p, cfun_gpr_save_slot): New macros.
	(s390_reg_clobbered_rtx, s390_regs_ever_clobbered): Change type of
	regs_ever_clobbered to char*.
	(s390_regs_ever_clobbered): Check crtl->saves_all_registers
	instead of cfun->has_nonlocal_label.  Ignore frame related restore
	INSNs.
	(s390_register_info): Enable FPR save slots.  Move/Copy some
	functionality into ...
	(s390_register_info_gprtofpr, s390_register_info_stdarg_fpr)
	(s390_register_info_stdarg_gpr, s390_optimize_register_info): New
	function.
	(s390_frame_info): Do gpr slot allocation here now.  stdarg does
	not imply a stack frame.
	(s390_init_frame_layout): Remove variable clobbered_regs.
	(s390_update_register_info): Remove function.
	(s390_hard_regno_rename_ok): Call-saved regs without a save slot
	cannot be used for register renaming.
	(s390_hard_regno_scratch_ok): New function.
	(TARGET_HARD_REGNO_SCRATCH_OK): Define target hook.
	(s390_initial_elimination_offset): Change offset calculation of
	the return address pointer.
	(save_gprs): Deal with only r6 being saved from the call-saved
	regs.
	(restore_gprs): Set frame related flag.
	(s390_save_gprs_to_fprs, s390_restore_gprs_from_fprs): New
	functions.
	(s390_emit_prologue): Call s390_register_info instead of
	s390_update_frame_layout.  Call s390_save_gprs_to_fprs.
	(s390_emit_epilogue): Call s390_restore_gprs_from_fprs.
	(s390_optimize_prologue): Call s390_optimize_register_info.
	Try to remove also FPR slot save/restore INSNs.  Remove frame
	related flags from restore INSNs.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@203303 138bc75d-0d04-0410-961f-82ee72b054a4