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.
From-SVN: r203303
