Revert this patch:

-       * haifa-sched.c (schedule_block): Do not count USE and CLOBBER
-       insns against the issue rate.
-
-       * sched-deps.c (sched_create_groups_for_libcalls): New function.
-       (sched_analyze): Use it.

From-SVN: r54015

gcc/ChangeLog

@@ -63,17 +63,6 @@
 	(SUBTARGET_EXTRA_SPECS): Define.
 	(CPP_SPEC): Remove.
 
-2002-05-29  Dale Johannesen  <dalej@apple.com>
-            Michael Matz  <matz@kde.org>
-            David Edelsohn  <edesohn@gnu.org>
-            Jeff Law <law@redhat.com>
-
-	* haifa-sched.c (schedule_block): Do not count USE and CLOBBER
-	insns against the issue rate.
-
-	* sched-deps.c (sched_create_groups_for_libcalls): New function.
-	(sched_analyze): Use it.
-
 2002-05-29  Chris Lattner  <sabre@nondot.org>
 
         * ssa.c (rename_insn_1): Rename uses of undefined registers to

gcc/haifa-sched.c

@@ -2179,10 +2179,7 @@ schedule_block (b, rgn_n_insns)
 	    can_issue_more =
 	      (*targetm.sched.variable_issue) (sched_dump, sched_verbose,
 					       insn, can_issue_more);
-	  /* A naked CLOBBER or USE generates no instruction, so do
-	     not count them against the issue rate.  */
-	  else if (GET_CODE (PATTERN (insn)) != USE
-		   && GET_CODE (PATTERN (insn)) != CLOBBER)
+	  else
 	    can_issue_more--;
 
 	  schedule_insn (insn, &ready, clock_var);

gcc/sched-deps.c

@@ -88,7 +88,6 @@ static void flush_pending_lists PARAMS ((struct deps *, rtx, int, int));
 static void sched_analyze_1 PARAMS ((struct deps *, rtx, rtx));
 static void sched_analyze_2 PARAMS ((struct deps *, rtx, rtx));
 static void sched_analyze_insn PARAMS ((struct deps *, rtx, rtx, rtx));
-static void sched_create_groups_for_libcalls PARAMS ((rtx, rtx));
 static rtx group_leader PARAMS ((rtx));
 
 static rtx get_condition PARAMS ((rtx));
@@ -1211,57 +1210,6 @@ sched_analyze_insn (deps, x, insn, loop_notes)
     }
 }
 
-/* Find any libcall sequences between HEAD and TAIL inclusive; set
-   SCHED_GROUP_P appropriately for such sequences.  */
-
-static void
-sched_create_groups_for_libcalls (head, tail)
-     rtx head, tail;
-{
-  rtx insn;
-  int tail_seen_p = 0;
-
-  for (insn = head;; insn = NEXT_INSN (insn))
-    {
-      rtx link, end_seq, set, r0, note;
-      if (INSN_P (insn) && GET_CODE (PATTERN (insn)) == CLOBBER
-	  && (r0 = XEXP (PATTERN (insn), 0), GET_CODE (r0) == REG)
-	  && (link = find_reg_note (insn, REG_LIBCALL, NULL_RTX)) != 0
-	  && (end_seq = XEXP (link, 0)) != 0
-	  && INSN_P (end_seq)
-	  && (set = single_set (end_seq)) != 0
-	  && SET_DEST (set) == r0 && SET_SRC (set) == r0
-	  && (note = find_reg_note (end_seq, REG_EQUAL, NULL_RTX)) != 0)
-	{
-	  /* We found a libcall block between insn and end_seq.
-	     The inner insns should be scheduled in a block.  */
-	  rtx inner;
-	  /* Paranoia.  */
-	  if (insn == tail)
-	    tail_seen_p = 1;
-	  /* We don't want to set this flag on the initial clobber, because
-	     the semantic of SCHED_GROUP_P is to make insn be scheduled
-	     together with the previous insn.  */
-	  for (inner = NEXT_INSN (insn); inner; inner = NEXT_INSN (inner))
-	    {
-	      if (INSN_P (inner))
-		set_sched_group_p (inner);
-	      /* Paranoia.  */
-	      if (inner == tail)
-		tail_seen_p = 1;
-	      if (inner == end_seq)
-		break;
-	    }
-	  /* We should be able to skip the whole lib-call block.
-	     Remember that one NEXT_INSN is done in the loop-iteration.  */
-	  insn = end_seq;
-	}
-      if (insn == tail || tail_seen_p)
-	break;
-    }
-  return;
-}
-
 /* Analyze every insn between HEAD and TAIL inclusive, creating LOG_LINKS
    for every dependency.  */
 
@@ -1409,10 +1357,6 @@ sched_analyze (deps, head, tail)
 	{
 	  if (current_sched_info->use_cselib)
 	    cselib_finish ();
-
-	  if (! reload_completed)
-	    sched_create_groups_for_libcalls (head, tail);
-
 	  return;
 	}
     }