s390.c (s390_backchain_string): Removed.

s390.c (s390_backchain_string): Removed.

2004-11-23  Andreas Krebbel  <krebbel1@de.ibm.com>

	* config/s390/s390.c (s390_backchain_string): Removed.
	(s390_return_addr_rtx, s390_back_chain_rtx, s390_frame_info)
	(s390_emit_prologue, s390_va_start, s390_gimplify_va_arg):
	Changed users of TARGET_BACKCHAIN, TARGET_NO_BACKCHAIN and
	TARGET_KERNEL_BACKCHAIN to reflect the new options.
	* config/s390/s390.h (MASK_BACKCHAIN, MASK_PACKED_STACK): New macros.
	(TARGET_KERNEL_BACKCHAIN): Removed.
	(TARGET_BACKCHAIN): Former triple state option change to a target flag.
	(TARGET_PACKED_STACK): New macro.
	(TARGET_SWITCHES): New switches added.
	(TARGET_OPTIONS): "backchain", "no-backchain" and "kernel-backchain"
	removed.
	(DYNAMIC_CHAIN_ADDRESS): Use TARGET_PACKED_STACK.
	* config/s390/s390.md ("allocate_stack", "restore_stack_block")
	("save_stack_nonlocal", "restore_stack_nonlocal"): Modified to reflect
	the change in target switch semantics.
	* config/s390/tpf.h (TARGET_DEFAULT_BACKCHAIN): Removed.
	(TARGET_DEFAULT): MASK_BACKCHAIN added.
	* doc/invoke.texi: Added documentation for the new/changed options.

From-SVN: r91096