[PATCH] Add max-gcse-passes param.

[Daniel Berlin <dan at cgsoftware dot com>]

2001-06-26  Daniel Berlin  <dan@cgsoftware.com>
	
	* doc/invoke.texi: Add description of max-gcse-passes param.

	* gcse.c (gcse_main): Use MAX_GCSE_PASSES instead of MAX_PASSES.
	(MAX_PASSES): Remove now unneeded macro.

	* params.h (MAX_GCSE_PASSES): New macro, to get parameter value of
	max-gcse-passes param.

	* params.def (PARAM_MAX_GCSE_PASSES): New parameter, controlling
	maximum number of GCSE passes to run. Defaults to 1 (which is what
	MAX_PASSES in gcse.c used to be).

Index: params.def
===================================================================
RCS file: /cvs/gcc/egcs/gcc/params.def,v
retrieving revision 1.5
diff -c -3 -p -w -B -b -r1.5 params.def
*** params.def	2001/05/01 18:51:06	1.5
--- params.def	2001/06/26 19:42:26
*************** DEFPARAM(PARAM_MAX_GCSE_MEMORY,
*** 74,80 ****
  	 "max-gcse-memory",
  	 "The maximum amount of memory to be allocated by GCSE",
  	 50 * 1024 * 1024)
! 
  /*
  Local variables:
  mode:c
--- 74,84 ----
  	 "max-gcse-memory",
  	 "The maximum amount of memory to be allocated by GCSE",
  	 50 * 1024 * 1024)
! /* The number of repetitions of copy/const prop and PRE to run. */
! DEFPARAM(PARAM_MAX_GCSE_PASSES,
! 	"max-gcse-passes",
! 	"The maximum number of passes to make when doing GCSE",
! 	1)
  /*
  Local variables:
  mode:c
Index: gcse.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/gcse.c,v
retrieving revision 1.132
diff -c -3 -p -w -B -b -r1.132 gcse.c
*** gcse.c	2001/06/04 18:04:35	1.132
--- gcse.c	2001/06/26 19:42:32
*************** Boston, MA 02111-1307, USA.  */
*** 166,174 ****
  #define obstack_chunk_alloc gmalloc
  #define obstack_chunk_free free
  
- /* Maximum number of passes to perform.  */
- #define MAX_PASSES 1
- 
  /* Propagate flow information through back edges and thus enable PRE's
     moving loop invariant calculations out of loops.
  
--- 166,171 ----
*************** Boston, MA 02111-1307, USA.  */
*** 232,238 ****
     substitutions.
  
     PRE is quite expensive in complicated functions because the DFA can take
!    awhile to converge.  Hence we only perform one pass.  Macro MAX_PASSES can
     be modified if one wants to experiment.
  
     **********************
--- 229,235 ----
     substitutions.
  
     PRE is quite expensive in complicated functions because the DFA can take
!    awhile to converge.  Hence we only perform one pass.  The parameter max-gcse-passes can
     be modified if one wants to experiment.
  
     **********************
*************** gcse_main (f, file)
*** 810,816 ****
    max_pass_bytes = 0;
    gcse_obstack_bottom = gcse_alloc (1);
    changed = 1;
!   while (changed && pass < MAX_PASSES)
      {
        changed = 0;
        if (file)
--- 807,813 ----
    max_pass_bytes = 0;
    gcse_obstack_bottom = gcse_alloc (1);
    changed = 1;
!   while (changed && pass < MAX_GCSE_PASSES)
      {
        changed = 0;
        if (file)
Index: params.h
===================================================================
RCS file: /cvs/gcc/egcs/gcc/params.h,v
retrieving revision 1.6
diff -c -3 -p -w -B -b -r1.6 params.h
*** params.h	2001/05/26 01:31:34	1.6
--- params.h	2001/06/26 19:43:52
*************** typedef enum compiler_param
*** 92,96 ****
    PARAM_VALUE (PARAM_MAX_DELAY_SLOT_LIVE_SEARCH)
  #define MAX_GCSE_MEMORY \
    ((size_t) PARAM_VALUE (PARAM_MAX_GCSE_MEMORY))
! 
  #endif /* ! GCC_PARAMS_H */
--- 92,97 ----
    PARAM_VALUE (PARAM_MAX_DELAY_SLOT_LIVE_SEARCH)
  #define MAX_GCSE_MEMORY \
    ((size_t) PARAM_VALUE (PARAM_MAX_GCSE_MEMORY))
! #define MAX_GCSE_PASSES \
!   PARAM_VALUE (PARAM_MAX_GCSE_PASSES)
  #endif /* ! GCC_PARAMS_H */
Index: doc/invoke.texi
===================================================================
RCS file: /cvs/gcc/egcs/gcc/doc/invoke.texi,v
retrieving revision 1.19
diff -c -3 -p -r1.19 invoke.texi
*** invoke.texi	2001/06/25 00:21:28	1.19
--- invoke.texi	2001/06/26 19:50:45
*************** order to perform the global common subex
*** 3784,3789 ****
--- 3784,3792 ----
  optimization.  If more memory than specified is required, the
  optimization will not be done.
  
+ @item max-gcse-passes
+ The maximum number of passes of GCSE to run. 
+ 
  @item max-inline-insns
  If an function contains more than this many instructions, it
  will not be inlined.  This option is precisely equivalent to

-- 
"If you're not part of the solution, you're part of the
precipitate.
"-Steven Wright