2002-11-04 Aldy Hernandez <aldyh@redhat.com>

	* hard-reg-set.h (REG_CANNOT_CHANGE_MODE_P): New.

	* config/rs6000/rs6000.h (CLASS_CANNOT_CHANGE_MODE_P): Remove.
	(CLASS_CANNOT_CHANGE_MODE): Remove.
	(CANNOT_CHANGE_MODE_CLASS): New.

	* config/alpha/alpha.h: Same.

	* config/ia64/ia64.h: Same.

	* config/mips/mips.h: Same.

	* config/s390/s390.h: Same.

	* config/sh/sh.h: Same.

	* config/pa/pa64-regs.h: Same.

	* config/sh/sh-protos.h (sh_cannot_change_mode_class): Add prototype.

	* config/sh/sh.c (sh_cannot_change_mode_class): New.

	* config/mips/mips-protos.h (mips_cannot_change_mode_class): Add
	prototype.

	* config/mips/mips.c (mips_cannot_change_mode_class): New.

	* doc/tm.texi (Register Classes): Remove
	CLASS_CANNOT_CHANGE_MODE and CLASS_CANNOT_CHANGE_MODE_P.
	Document CANNOT_CHANGE_MODE_CLASS.

	* reload.c (push_reload): Use CANNOT_CHANGE_MODE_CLASS.
	(push_reload): Same.

	* simplify-rtx.c (simplify_subreg): Same.

	* reload1.c (choose_reload_regs): Same.

	* recog.c (register_operand): Same.

	* regrename.c (mode_change_ok): Change to use new
	CANNOT_CHANGE_MODE_CLASS infrastructure.

	* regclass.c (cannot_change_mode_set_regs): New.
	Declare subregs_of_mode.
	(regclass): Use subregs_of_mode.
	Remove references to reg_changes_mode.
	(init_reg_sets_1): Remove class_can_change_mode and
	reg_changes_mode code.
	(invalid_mode_change_p): New.
	(dump_regclass): Use invalid_mode_change_p instead of
	class_can_change_mode.
	(regclass): Same.
	(record_operand_costs): Do not set reg_changes_mode.

	* local-alloc.c (struct qty): Remove changes_mode field.
	(alloc_qty): Remove changes_mode initialization.
	(update_qty_class): Remove set of changes_mode.
	(find_free_reg): Use subregs_of_mode.

	* global.c (find_reg): Use subregs_of_mode info.

	* rtl.h (cannot_change_mode_set_regs): New prototype.
	(invalid_mode_change_p): Same.
	(REG_CANNOT_CHANGE_MODE_P): New macro.

	* flow.c (mark_used_regs): Calculate subregs_of_mode.  Remove
	REG_CHANGES_MODE.
	(life_analysis): Clear subregs_of_mode.

	* combine.c (subst): Pass class to CLASS_CANNOT_CHANGE_MODE_P.
	Remove use of CLASS_CANNOT_CHANGE_MODE.
	(simplify_set): Same.
	(gen_lowpart_for_combine): Calculate subregs_of_mode.  Remove
	REG_CHANGES_MODE.

	* regs.h: Add extern for subregs_of_mode;
	Include hard-reg-set and basic-block.
	(REG_CHANGES_MODE): Delete.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@58794 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 16 insertions, 11 deletions

diff --git a/gcc/flow.c b/gcc/flow.c
index d9e3ae3ce40..180796268c6 100644
--- a/gcc/flow.c
+++ b/gcc/flow.c
@@ -414,8 +414,8 @@ life_analysis (f, file, flags)
      FILE *file;
      int flags;
 {
-#ifdef ELIMINABLE_REGS
   int i;
+#ifdef ELIMINABLE_REGS
   static const struct {const int from, to; } eliminables[] = ELIMINABLE_REGS;
 #endif
 
@@ -431,6 +431,13 @@ life_analysis (f, file, flags)
   SET_HARD_REG_BIT (elim_reg_set, FRAME_POINTER_REGNUM);
 #endif
 
+
+#ifdef CANNOT_CHANGE_MODE_CLASS
+  if (flags & PROP_REG_INFO)
+    for (i=0; i < NUM_MACHINE_MODES; ++i)
+      INIT_REG_SET (&subregs_of_mode[i]);
+#endif
+
   if (! optimize)
     flags &= ~(PROP_LOG_LINKS | PROP_AUTOINC | PROP_ALLOW_CFG_CHANGES);
 
@@ -3813,12 +3820,11 @@ mark_used_regs (pbi, x, cond, insn)
       break;
 
     case SUBREG:
-#ifdef CLASS_CANNOT_CHANGE_MODE
+#ifdef CANNOT_CHANGE_MODE_CLASS
       if (GET_CODE (SUBREG_REG (x)) == REG
-	  && REGNO (SUBREG_REG (x)) >= FIRST_PSEUDO_REGISTER
-	  && CLASS_CANNOT_CHANGE_MODE_P (GET_MODE (x),
-					 GET_MODE (SUBREG_REG (x))))
-	REG_CHANGES_MODE (REGNO (SUBREG_REG (x))) = 1;
+	  && REGNO (SUBREG_REG (x)) >= FIRST_PSEUDO_REGISTER)
+	SET_REGNO_REG_SET (&subregs_of_mode[GET_MODE (x)],
+			   REGNO (SUBREG_REG (x)));
 #endif
 
       /* While we're here, optimize this case.  */
@@ -3862,13 +3868,12 @@ mark_used_regs (pbi, x, cond, insn)
 	       || GET_CODE (testreg) == SIGN_EXTRACT
 	       || GET_CODE (testreg) == SUBREG)
 	  {
-#ifdef CLASS_CANNOT_CHANGE_MODE
+#ifdef CANNOT_CHANGE_MODE_CLASS
 	    if (GET_CODE (testreg) == SUBREG
 		&& GET_CODE (SUBREG_REG (testreg)) == REG
-		&& REGNO (SUBREG_REG (testreg)) >= FIRST_PSEUDO_REGISTER
-		&& CLASS_CANNOT_CHANGE_MODE_P (GET_MODE (SUBREG_REG (testreg)),
-					       GET_MODE (testreg)))
-	      REG_CHANGES_MODE (REGNO (SUBREG_REG (testreg))) = 1;
+		&& REGNO (SUBREG_REG (testreg)) >= FIRST_PSEUDO_REGISTER)
+	      SET_REGNO_REG_SET (&subregs_of_mode[GET_MODE (testreg)],
+				 REGNO (SUBREG_REG (testreg)));
 #endif
 
 	    /* Modifying a single register in an alternate mode