reload.h (compute_use_by_pseudos): Declare.

	* reload.h (compute_use_by_pseudos): Declare.
	* reload1.c (spilled_pseudos, insns_need_reload): New variables.
	(something_needs_reloads): Delete variable.
	(finish_spills): New function.
	(compute_use_by_pseudos): New function.
	(delete_caller_save_insns): Lose argument FIRST.  All callers changed.
	Use the reload_insn_chain instead of walking the rtl directly.
	(reload): Allocate and free spilled_pseudos.
	Ensure that all calls of spill_hard_reg are followed by a call to
	finish_spills.
	Use the insns_need_reload list instead of something_needs_reloads
	to find out if reload_as_needed must be called.
	Clear unused_insn_chains at the end.
	(calculate_needs_all_insns): Lose FIRST parameter.  All callers
	changed.
	Delete code to keep track of current basic block.
	Walk reload_insn_chain instead of the rtl structure.  Build the
	insns_need_reload chain.
	Remember which insns need reloading/elimination by setting the
	appropriate fields in struct insn_chain, not by putting modes on the
	insn.
	(calculate_needs): Lose THIS_BLOCK arg.  Accept arg CHAIN instead of
	arg INSN.  All callers changed.
	Delete declaration of struct needs.
	Don't set something_needs_reloads.
	Record insn needs in the CHAIN argument.
	(spill_hard_reg): Record the affected pseudos in spilled_pseudos.
	(reload_as_needed): Lose FIRST arg.  All callers changed.
	Walk the reload_insn_chain instead of the rtx structure.
	Delete code to keep track of current basic block.
	Rename one of the NEXT variables to OLD_NEXT.
	(allocate_reload_reg): Accept arg CHAIN instead of arg INSN.  All
	callers changed.
	(choose_reload_regs): Likewise.
	(emit_reload_insns): Replace INSN and BB args with arg CHAIN.  All
	callers changed.
	* caller-save.c (MOVE_MAX_WORDS): New macro.  Use it throughout
	instead of (MOVE_MAX / UNITS_PER_WORD) computation.
	(hard_regs_live, hard_regs_need_restore): Delete variables.
	(n_regs_saved): Now static.
	(referenced_regs, this_insn_sets): New variables.
	(setup_save_areas): Restructure the code a bit.
	(restore_referenced_regs): Delete function.
	(mark_referenced_regs): New function, similar to the old
	restore_referenced_regs, but mark registers in referenced_regs.
	(clear_reg_live): Delete function.
	(mark_set_regs): Renamed from set_reg_live.  All callers changed.
	Only mark registers in this_insn_sets.
	(save_call_clobbered_regs): Rework this function to walk the
	reload_insn_chain instead of using the list of instructions directly.
	Delete code to keep track of register lives, compute live regs on the
	fly from information in the chain.
	Instead of calling restore_referenced_regs, use mark_referenced_regs,
	then walk the set it computes and call insert_restore as appropriate.
	(insert_restore): Lose INSN and BLOCK args.  Add CHAIN arg.  All
	callers changed.
	Restructure the code a bit.  Test hard_regs_saved instead of
	hard_regs_need_restore.
	(insert_save): Lose INSN and BLOCK args.  Add CHAIN and TO_SAVE
	args.  All callers changed.
	Restructure the code a bit.  Use TO_SAVE to determine which regs to
	save instead of more complicated test.
	(insert_one_arg): Lose INSN and BLOCK args.  Add CHAIN arg.  All
	callers changed.
	Create a new insn_chain structure for the new insn and place it
	into the chain.
	* rtl.texi: Update documentation to reflect that reload no longer
	puts modes on the insns.

From-SVN: r23074

gcc/ChangeLog

+Tue Oct 13 22:12:11 1998  Bernd Schmidt <crux@pool.informatik.rwth-aachen.de>
+
+	* reload.h (compute_use_by_pseudos): Declare.
+
+	* reload1.c (spilled_pseudos, insns_need_reload): New variables.
+	(something_needs_reloads): Delete variable.
+	(finish_spills): New function.
+	(compute_use_by_pseudos): New function.
+
+	(delete_caller_save_insns): Lose argument FIRST.  All callers changed.
+	Use the reload_insn_chain instead of walking the rtl directly.
+
+	(reload): Allocate and free spilled_pseudos.
+	Ensure that all calls of spill_hard_reg are followed by a call to
+	finish_spills.
+	Use the insns_need_reload list instead of something_needs_reloads
+	to find out if reload_as_needed must be called.
+	Clear unused_insn_chains at the end.
+
+	(calculate_needs_all_insns): Lose FIRST parameter.  All callers
+	changed.
+	Delete code to keep track of current basic block.
+	Walk reload_insn_chain instead of the rtl structure.  Build the
+	insns_need_reload chain.
+	Remember which insns need reloading/elimination by setting the
+	appropriate fields in struct insn_chain, not by putting modes on the
+	insn.
+
+	(calculate_needs): Lose THIS_BLOCK arg.  Accept arg CHAIN instead of
+	arg INSN.  All callers changed.
+	Delete declaration of struct needs.
+	Don't set something_needs_reloads.
+	Record insn needs in the CHAIN argument.
+
+	(spill_hard_reg): Record the affected pseudos in spilled_pseudos.
+
+	(reload_as_needed): Lose FIRST arg.  All callers changed.
+	Walk the reload_insn_chain instead of the rtx structure.
+	Delete code to keep track of current basic block.
+	Rename one of the NEXT variables to OLD_NEXT.
+
+	(allocate_reload_reg): Accept arg CHAIN instead of arg INSN.  All
+	callers changed.
+	(choose_reload_regs): Likewise.
+
+	(emit_reload_insns): Replace INSN and BB args with arg CHAIN.  All
+	callers changed.
+	
+	* caller-save.c (MOVE_MAX_WORDS): New macro.  Use it throughout
+	instead of (MOVE_MAX / UNITS_PER_WORD) computation.
+	(hard_regs_live, hard_regs_need_restore): Delete variables.
+	(n_regs_saved): Now static.
+	(referenced_regs, this_insn_sets): New variables.
+
+	(setup_save_areas): Restructure the code a bit.
+
+	(restore_referenced_regs): Delete function.
+	(mark_referenced_regs): New function, similar to the old
+	restore_referenced_regs, but mark registers in referenced_regs.
+
+	(clear_reg_live): Delete function.
+	(mark_set_regs): Renamed from set_reg_live.  All callers changed.
+	Only mark registers in this_insn_sets.
+
+	(save_call_clobbered_regs): Rework this function to walk the
+	reload_insn_chain instead of using the list of instructions directly.
+	Delete code to keep track of register lives, compute live regs on the
+	fly from information in the chain.
+	Instead of calling restore_referenced_regs, use mark_referenced_regs,
+	then walk the set it computes and call insert_restore as appropriate.
+
+	(insert_restore): Lose INSN and BLOCK args.  Add CHAIN arg.  All
+	callers changed.
+	Restructure the code a bit.  Test hard_regs_saved instead of
+	hard_regs_need_restore.
+	(insert_save): Lose INSN and BLOCK args.  Add CHAIN and TO_SAVE
+	args.  All callers changed.
+	Restructure the code a bit.  Use TO_SAVE to determine which regs to
+	save instead of more complicated test.
+	(insert_one_arg): Lose INSN and BLOCK args.  Add CHAIN arg.  All
+	callers changed.
+	Create a new insn_chain structure for the new insn and place it
+	into the chain.
+
+	* rtl.texi: Update documentation to reflect that reload no longer
+	puts modes on the insns.
+
 1998-10-14  Andreas Schwab  <schwab@issan.cs.uni-dortmund.de>
 
 	* function.c (purge_addressof_1): Force the first argument of a

gcc/reload.h

@@ -215,6 +215,7 @@ extern struct insn_chain *reload_insn_chain;
 /* Allocate a new insn_chain structure.  */
 extern struct insn_chain *new_insn_chain	PROTO((void));
 
+extern void compute_use_by_pseudos		PROTO((HARD_REG_SET *, regset));
 #endif
 
 /* Functions from reload.c:  */

gcc/rtl.texi

@@ -2372,9 +2372,7 @@ These codes are printed symbolically when they appear in debugging dumps.
 @cindex @code{HImode}, in @code{insn}
 @cindex @code{QImode}, in @code{insn}
 The machine mode of an insn is normally @code{VOIDmode}, but some
-phases use the mode for various purposes; for example, the reload pass
-sets it to @code{HImode} if the insn needs reloading but not register
-elimination and @code{QImode} if both are required. 
+phases use the mode for various purposes. 
 
 The common subexpression elimination pass sets the mode of an insn to
 @code{QImode} when it is the first insn in a block that has already