Loop cleanup part 1

Michael Hayes m.hayes@elec.canterbury.ac.nz
Sun Jan 17 13:37:00 GMT 1999


Here's the first patch of my continuing cleanup of the loop optimizer.

This patch removes many of the global arrays by extending the
structure loop_info.  prescan_loop now just fills in fields of this
structure.  I have also rename the old loop_info pointer to this_loop
to avoid ambiguity with the changes in the second patch.

The second patch replaces more of the global arrays with a new
structure array, loops, that is indexed by the loop number.

I then suggest that we rationalise some of the redundant arguments of
the functions in loop.c and unroll.c and possibly move some of the
functions between the files (or split others into another file).

Michael.

Sun Jan 17 22:14:17 1999  Michael Hayes  <m.hayes@elec.canterbury.ac.nz>

	* loop.h (struct loop_info): New fields: 'has_call',
 	'has_volatile', 'has_tablejump', 'has_multiple_exit_targets',
 	'num_mem_sets', 'unknown_address_altered', 'loops_enclosed', and
 	'cont'.
	* loop.c (this_loop_info): New global variable.	
	(loop_has_call, loop_has_volatile, loop_has_tablejump, loop_continue,
	unknown_address_altered, num_mem_sets, loops_enclosed): Arrays
	deleted and replaced by entries in this_loop_info structure.
	All uses updated.
	(scan_loop): New variable this_loop.
	(prescan_loop): New argument this_loop.  Set 'vtop' field
	if NOTE_INSN_LOOP_VTOP found.
	(strength_reduce): New argument this_loop.  Deleted variable
	loop_info and replaced all uses with this_loop.
	* unroll.c (unroll_loop, precondition_loop_p): Renamed loop_info
	with this_loop.
	(loop_iterations): Renamed loop_info with this_loop.  Don't scan
	for vtop since this is now done in prescan_loop.


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`
end






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