diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1280151524f..f81021ae82c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2007-08-22  Rask Ingemann Lambertsen  <rask@sygehus.dk>
+
+	PR rtl-optimization/32557
+	* df-problems.c (df_note_bb_compute): Use mws->start_regno instead
+	of REGNO (mws->mw_reg).
+
 2007-08-22  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/33007
diff --git a/gcc/df-problems.c b/gcc/df-problems.c
index f5ca47f785f..9ae57d12e2f 100644
--- a/gcc/df-problems.c
+++ b/gcc/df-problems.c
@@ -3425,7 +3425,7 @@ df_note_bb_compute (unsigned int bb_index,
 	    {
 	      struct df_mw_hardreg *mws = *mws_rec; 
 	      if ((mws->type == DF_REF_REG_DEF) 
-		  && !df_ignore_stack_reg (REGNO (mws->mw_reg)))
+		  && !df_ignore_stack_reg (mws->start_regno))
 		old_unused_notes 
 		  = df_set_unused_notes_for_mw (insn, old_unused_notes, 
 						mws, live, do_not_gen, 
@@ -3488,7 +3488,7 @@ df_note_bb_compute (unsigned int bb_index,
 	{
 	  struct df_mw_hardreg *mws = *mws_rec; 
 	  if ((mws->type != DF_REF_REG_DEF)  
-	      && !df_ignore_stack_reg (REGNO (mws->mw_reg)))
+	      && !df_ignore_stack_reg (mws->start_regno))
 	    old_dead_notes
 	      = df_set_dead_notes_for_mw (insn, old_dead_notes, 
 					  mws, live, do_not_gen,