2003-01-09 Vladimir Makarov <vmakarov@redhat.com>

	Merging changes from itanium-sched-branch:


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@61132 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 12 insertions, 52 deletions

diff --git a/gcc/sched-rgn.c b/gcc/sched-rgn.c
index 43fdef72cd8..36a53f73c26 100644
--- a/gcc/sched-rgn.c
+++ b/gcc/sched-rgn.c
@@ -2023,17 +2023,9 @@ init_ready_list (ready)
      Count number of insns in the target block being scheduled.  */
   for (insn = NEXT_INSN (prev_head); insn != next_tail; insn = NEXT_INSN (insn))
     {
-      rtx next;
-
-      if (! INSN_P (insn))
-	continue;
-      next = NEXT_INSN (insn);
-
-      if (INSN_DEP_COUNT (insn) == 0
-	  && (! INSN_P (next) || SCHED_GROUP_P (next) == 0))
+      if (INSN_DEP_COUNT (insn) == 0)
 	ready_add (ready, insn);
-      if (!(SCHED_GROUP_P (insn)))
-	target_n_insns++;
+      target_n_insns++;
     }
 
   /* Add to ready list all 'ready' insns in valid source blocks.
@@ -2067,19 +2059,8 @@ init_ready_list (ready)
 							     insn, insn) <= 3)))
 			&& check_live (insn, bb_src)
 			&& is_exception_free (insn, bb_src, target_bb))))
-	      {
-		rtx next;
-
-		/* Note that we haven't squirreled away the notes for
-		   blocks other than the current.  So if this is a
-		   speculative insn, NEXT might otherwise be a note.  */
-		next = next_nonnote_insn (insn);
-		if (INSN_DEP_COUNT (insn) == 0
-		    && (! next
-			|| ! INSN_P (next)
-			|| SCHED_GROUP_P (next) == 0))
-		  ready_add (ready, insn);
-	      }
+	      if (INSN_DEP_COUNT (insn) == 0)
+		ready_add (ready, insn);
 	  }
       }
 }
@@ -2097,7 +2078,6 @@ can_schedule_ready_p (insn)
   /* An interblock motion?  */
   if (INSN_BB (insn) != target_bb)
     {
-      rtx temp;
       basic_block b1;
 
       if (IS_SPECULATIVE_INSN (insn))
@@ -2114,18 +2094,9 @@ can_schedule_ready_p (insn)
 	}
       nr_inter++;
 
-      /* Find the beginning of the scheduling group.  */
-      /* ??? Ought to update basic block here, but later bits of
-	 schedule_block assumes the original insn block is
-	 still intact.  */
-
-      temp = insn;
-      while (SCHED_GROUP_P (temp))
-	temp = PREV_INSN (temp);
-
       /* Update source block boundaries.  */
-      b1 = BLOCK_FOR_INSN (temp);
-      if (temp == b1->head && insn == b1->end)
+      b1 = BLOCK_FOR_INSN (insn);
+      if (insn == b1->head && insn == b1->end)
 	{
 	  /* We moved all the insns in the basic block.
 	     Emit a note after the last insn and update the
@@ -2139,9 +2110,9 @@ can_schedule_ready_p (insn)
 	  /* We took insns from the end of the basic block,
 	     so update the end of block boundary so that it
 	     points to the first insn we did not move.  */
-	  b1->end = PREV_INSN (temp);
+	  b1->end = PREV_INSN (insn);
 	}
-      else if (temp == b1->head)
+      else if (insn == b1->head)
 	{
 	  /* We took insns from the start of the basic block,
 	     so update the start of block boundary so that
@@ -2361,17 +2332,6 @@ add_branch_dependences (head, tail)
 	  CANT_MOVE (insn) = 1;
 
 	  last = insn;
-	  /* Skip over insns that are part of a group.
-	     Make each insn explicitly depend on the previous insn.
-	     This ensures that only the group header will ever enter
-	     the ready queue (and, when scheduled, will automatically
-	     schedule the SCHED_GROUP_P block).  */
-	  while (SCHED_GROUP_P (insn))
-	    {
-	      rtx temp = prev_nonnote_insn (insn);
-	      add_dependence (insn, temp, REG_DEP_ANTI);
-	      insn = temp;
-	    }
 	}
 
       /* Don't overrun the bounds of the basic block.  */
@@ -2393,10 +2353,6 @@ add_branch_dependences (head, tail)
 
 	add_dependence (last, insn, REG_DEP_ANTI);
 	INSN_REF_COUNT (insn) = 1;
-
-	/* Skip over insns that are part of a group.  */
-	while (SCHED_GROUP_P (insn))
-	  insn = prev_nonnote_insn (insn);
       }
 }
 
@@ -2728,6 +2684,10 @@ schedule_region (rgn)
       get_block_head_tail (BB_TO_BLOCK (bb), &head, &tail);
 
       compute_forward_dependences (head, tail);
+
+      if (targetm.sched.dependencies_evaluation_hook)
+	targetm.sched.dependencies_evaluation_hook (head, tail);
+
     }
 
   /* Set priorities.  */