From d73b1f074b027d0bf173cbe7b6dc88df5307889c Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@gcc.gnu.org>
Date: Sun, 30 Dec 2001 20:19:35 -0800
Subject: cfglayout.c (scope_def, [...]): Remove.

        * cfglayout.c (scope_def, scope_forest_info, forest,
        relate_bbs_with_scopes, make_new_scope, build_scope_forest,
        remove_scope_notes, insert_intra_before_1, insert_intra_1,
        insert_intra_bb_scope_notes, insert_inter_bb_scope_notes,
        rebuild_scope_notes, free_scope_forest_1, dump_scope_forest,
        dump_scope_forest_1, get_next_bb_note, get_prev_bb_note): Remove.
        (fixup_reorder_chain): Don't set scope for bb.
        (insn_scopes, scope_to_insns_initialize, set_block_levels,
        change_scope, scope_to_insns_finalize): New.
        (cfg_layout_initialize, cfg_layout_finalize): Update to match.
        * cfglayout.h (scope_def, scope): Remove.
        (reorder_block_def): Remove scope member.
        (scope_to_insns_initialize, scope_to_insns_finalize): Declare.
        * haifa-sched.c: Revert reemit_other_notes change.
        * sched-ebb.c (schedule_ebbs): Don't call remove_unnecessary_notes.
        Use scope_to_insns_initialize and scope_to_insns_finalize.
        * sched-rgn.c (schedule_insns): Likewise.

        * gcc.dg/debug-6.c: New.

From-SVN: r48412
---
 gcc/haifa-sched.c | 74 ++++++++++++++-----------------------------------------
 1 file changed, 18 insertions(+), 56 deletions(-)

(limited to 'gcc/haifa-sched.c')

diff --git a/gcc/haifa-sched.c b/gcc/haifa-sched.c
index ca6cfbb..7b9a2e8 100644
--- a/gcc/haifa-sched.c
+++ b/gcc/haifa-sched.c
@@ -319,7 +319,6 @@ static void adjust_priority PARAMS ((rtx));
 static rtx unlink_other_notes PARAMS ((rtx, rtx));
 static rtx unlink_line_notes PARAMS ((rtx, rtx));
 static rtx reemit_notes PARAMS ((rtx, rtx));
-static rtx reemit_other_notes PARAMS ((rtx, rtx));
 
 static rtx *ready_lastpos PARAMS ((struct ready_list *));
 static void ready_sort PARAMS ((struct ready_list *));
@@ -1576,60 +1575,6 @@ reemit_notes (insn, last)
   return retval;
 }
 
-
-/* NOTE_LIST is the end of a chain of notes previously found among the
-   insns.  Insert them at the beginning of the insns.  Actually, insert
-   NOTE_INSN_BLOCK_END notes at the end of the insns.  Doing otherwise
-   tends to collapse lexical blocks into empty regions, which is somewhat
-   less than useful.  */
-/* ??? Ideally we'd mark each insn with the block it originated from,
-   and preserve that information.  This requires some moderately
-   sophisticated block reconstruction code, since block nestings must
-   be preserved.  */
-
-static rtx
-reemit_other_notes (head, tail)
-     rtx head, tail;
-{
-  bool saw_block_beg = false;
-
-  while (note_list)
-    {
-      rtx note_tail = note_list;
-      note_list = PREV_INSN (note_tail);
-
-      if (NOTE_LINE_NUMBER (note_tail) == NOTE_INSN_BLOCK_END
-	  /* We can only extend the lexical block while we havn't
-	     seen a BLOCK_BEG note.  Otherwise we risk mis-nesting
-	     the notes.  */
-	  && ! saw_block_beg)
-	{
-	  rtx insert_after = tail;
-	  if (GET_CODE (NEXT_INSN (tail)) == BARRIER)
-	    insert_after = NEXT_INSN (tail);
-
-	  PREV_INSN (note_tail) = insert_after;
-	  NEXT_INSN (note_tail) = NEXT_INSN (insert_after);
-	  if (NEXT_INSN (insert_after))
-	    PREV_INSN (NEXT_INSN (insert_after)) = note_tail;
-	  NEXT_INSN (insert_after) = note_tail;
-	}
-      else
-	{
-	  if (NOTE_LINE_NUMBER (note_tail) == NOTE_INSN_BLOCK_BEG)
-	    saw_block_beg = true;
-
-	  PREV_INSN (note_tail) = PREV_INSN (head);
-	  NEXT_INSN (PREV_INSN (head)) = note_tail;
-	  NEXT_INSN (note_tail) = head;
-	  PREV_INSN (head) = note_tail;
-	  head = note_tail;
-	}
-    }
-
-  return head;
-}
-
 /* Move INSN, and all insns which should be issued before it,
    due to SCHED_GROUP_P flag.  Reemit notes if needed.
 
@@ -1855,7 +1800,24 @@ schedule_block (b, rgn_n_insns)
   head = NEXT_INSN (prev_head);
   tail = last;
 
-  head = reemit_other_notes (head, tail);
+  /* Restore-other-notes: NOTE_LIST is the end of a chain of notes
+     previously found among the insns.  Insert them at the beginning
+     of the insns.  */
+  if (note_list != 0)
+    {
+      rtx note_head = note_list;
+
+      while (PREV_INSN (note_head))
+	{
+	  note_head = PREV_INSN (note_head);
+	}
+
+      PREV_INSN (note_head) = PREV_INSN (head);
+      NEXT_INSN (PREV_INSN (head)) = note_head;
+      PREV_INSN (head) = note_list;
+      NEXT_INSN (note_list) = head;
+      head = note_head;
+    }
 
   /* Debugging.  */
   if (sched_verbose)
-- 
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