Re: Loop optimizer tidy up

[Jeffrey A Law <law at cygnus dot com>]

  In message <14279.19614.431767.425497@ongaonga.elec.canterbury.ac.nz>you writ
e:
  > 
  > This patch removes most of the global variables used to store
  > information about things found within a loop and replaces them
  > with entries in the loop_info structure.
  > 
  > It also renames this_loop with this_loop_num in find_and_verify loops
  > to be consistent with the rest of loop.c.
  > 
  > This patch is a precursor for my low overhead loop optimizing patches
  > to follow.
  > 
  > Michael.
  > 
  > 1999-08-28  Michael Hayes  <m.hayes@elec.canterbury.ac.nz>
  > 
  > 	* loop.c (this_loop_info): New variable.
  > 	(loop_has_call, loop_has_volatile, loop_has_tablejump,
  > 	loop_continue, loops_enclosed): Replace with fields in this_loop_info.
  > 	All uses updated.
  > 	(prescan_loop, strength_reduce): New argument loop_info.  All callers
  > 	updated.
  > 	(scan_loop): New variable loop_info, initialise to address of
  > 	this_loop_info.
  > 	(prescan_loop): Set loop_info->vtop if find NOTE_INSN_LOOP_VTOP.
  > 	Delete variable loop_has_multiple_exit targets and replace with
  > 	field in this_loop_info.
  > 	(find_and_verify_loops): Rename this_loop to this_loop_num.
  > 	(strength_reduce): Delete loop_iteration_info.  Replace variable
  > 	loop_info with function argument of same name.
  > 	(insert_bct): Rework test for loop being completely unrolled.
  > 
  > 	* loop.h (struct loop_info): New fields num, loops_enclosed,
  > 	has_call, has_volatile, has_tablejump, has_multiple_exit_targets,
  > 	has_indirect_jump, and cont.  Redefine use of unroll_number.
  > 	(loop_unroll_number): Delete.
  > 
  > 	* unroll.c (unroll_loop): Store loop unroll count in unroll_number
  > 	field of loop_info.
  > 	(loop_iterations): Delete variable vtop and instead use
  > 	loop_info->vtop computed in prescan_loop.
Thanks.  Installed (and I get to remove the Jan '99 variant patch from my
queue :-)

jeff