2002-07-15 Michael Matz <matz@suse.de>,

            Daniel Berlin  <dberlin@dberlin.org>,
	    Denis Chertykov  <denisc@overta.ru>

	Add a new register allocator.

	* ra.c: New file.
	* ra.h: New file.
	* ra-build.c: New file.
	* ra-colorize.c: New file.
	* ra-debug.c: New file.
	* ra-rewrite.c: New file.

	* Makefile.in (ra.o, ra-build.o, ra-colorize.o, ra-debug.o,
	(ra-rewrite.o): New .o files for libbackend.a.
	(GTFILES): Add basic-block.h.

	* toplev.c (flag_new_regalloc): New.
	(f_options): New option "new-ra".
	(rest_of_compilation): Call initialize_uninitialized_subregs()
	only for the old allocator.  If flag_new_regalloc is set, call
	new allocator, instead of local_alloc(), global_alloc() and
	friends.

	* doc/invoke.texi: Document -fnew-ra.
	* basic-block.h (FOR_ALL_BB): New.
	* config/rs6000/rs6000.c (print_operand): Write small constants
	as @l+80.

	* df.c (read_modify_subreg_p): Narrow down cases for a rmw subreg.
	(df_reg_table_realloc): Make size at least as large as max_reg_num().
	(df_insn_table_realloc): Size argument now is absolute, not relative.
	Changed all callers.

	* gengtype.c (main): Add the pseudo-type "HARD_REG_SET".
	* regclass.c (reg_scan_mark_refs): Ignore NULL rtx's.

	2002-06-20  Michael Matz  <matz@suse.de>

	* df.h (struct ref.id): Make unsigned.
	* df.c (df_bb_reg_def_chain_create): Remove unsigned cast.

	2002-06-13  Michael Matz  <matz@suse.de>

	* df.h (DF_REF_MODE_CHANGE): New flag.
	* df.c (df_def_record_1, df_uses_record): Set this flag for refs
	involving subregs with invalid mode changes, when
	CLASS_CANNOT_CHANGE_MODE is defined.

	2002-05-07  Michael Matz  <matz@suse.de>

	* reload1.c (fixup_abnormal_edges): Don't insert on NULL edge.

	2002-05-03  Michael Matz  <matz@suse.de>

	* sbitmap.c (sbitmap_difference): Accept sbitmaps of different size.

	Sat Feb  2 18:58:07 2002  Denis Chertykov  <denisc@overta.ru>

	* regclass.c (regclass): Work with all regs which have sets or
	refs.
	(reg_scan_mark_refs): Count regs inside (clobber ...).

	2002-01-04  Michael Matz  <matzmich@cs.tu-berlin.de>

	* df.c (df_ref_record): Correctly calculate SUBREGs of hardregs.
	(df_bb_reg_def_chain_create, df_bb_reg_use_chain_create): Only
	add new refs.
	(df_bb_refs_update): Don't clear insns_modified here, ...
	(df_analyse): ... but here.

	* sbitmap.c (dump_sbitmap_file): New.
	(debug_sbitmap): Use it.

	* sbitmap.h (dump_sbitmap_file): Add prototype.

	2001-08-07  Daniel Berlin  <dan@cgsoftware.com>

	* df.c (df_insn_modify): Grow the UID table if necessary, rather
	than assume all emits go through df_insns_modify.

	2001-07-26  Daniel Berlin  <dan@cgsoftware.com>

	* regclass.c (reg_scan_mark_refs): When we increase REG_N_SETS,
	increase REG_N_REFS (like flow does), so that regclass doesn't
	think a reg is useless, and thus, not calculate a class, when it
	really should have.

	2001-01-28  Daniel Berlin  <dberlin@redhat.com>

	* sbitmap.h (EXECUTE_IF_SET_IN_SBITMAP_REV): New macro, needed for
	dataflow analysis.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@55458 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 11 insertions, 2 deletions

diff --git a/gcc/df.h b/gcc/df.h
index 7f4e4be71ef..59f314384a2 100644
--- a/gcc/df.h
+++ b/gcc/df.h
@@ -50,7 +50,16 @@ struct df_link
 
 enum df_ref_flags
   {
-    DF_REF_READ_WRITE = 1
+    DF_REF_READ_WRITE = 1,
+
+    /* This flag is set on register references itself representing a or
+       being inside a subreg on machines which have CLASS_CANNOT_CHANGE_MODE
+       and where the mode change of that subreg expression is invalid for
+       this class.  Note, that this flag can also be set on df_refs
+       representing the REG itself (i.e. one might not see the subreg
+       anyore).  Also note, that this flag is set also for hardreg refs.
+       I.e. you must check yourself if it's a pseudo.  */
+    DF_REF_MODE_CHANGE = 2
   };
 
 /* Define a register reference structure.  */
@@ -61,7 +70,7 @@ struct ref
   rtx *loc;			/* Loc is the location of the reg.  */
   struct df_link *chain;	/* Head of def-use or use-def chain.  */
   enum df_ref_type type;	/* Type of ref.  */
-  int id;			/* Ref index.  */
+  unsigned int id;		/* Ref index.  */
   enum df_ref_flags flags;	/* Various flags.  */
 };