re PR middle-end/32321 (ICE in df_refs_verify with -fgcse-sm)

2007-06-18  Seongbae Park  <seongbae.park@gmail.com>

	PR rtl-optimization/32321
	* gcse.c (replace_store_insn): Update the note before
	calling emit_insn_after.

From-SVN: r125827

gcc/ChangeLog

+2007-06-18  Seongbae Park  <seongbae.park@gmail.com>
+
+	PR rtl-optimization/32321
+	* gcse.c (replace_store_insn): Update the note before
+	calling emit_insn_after.
+
 2007-06-18  David Daney  <ddaney@avtrex.com
 
 	Revert:

gcc/gcse.c

@@ -6341,17 +6341,6 @@ replace_store_insn (rtx reg, rtx del, basic_block bb, struct ls_expr *smexpr)
 
   mem = smexpr->pattern;
   insn = gen_move_insn (reg, SET_SRC (single_set (del)));
-  insn = emit_insn_after (insn, del);
-
-  if (dump_file)
-    {
-      fprintf (dump_file,
-	       "STORE_MOTION  delete insn in BB %d:\n      ", bb->index);
-      print_inline_rtx (dump_file, del, 6);
-      fprintf (dump_file, "\nSTORE MOTION  replaced with insn:\n      ");
-      print_inline_rtx (dump_file, insn, 6);
-      fprintf (dump_file, "\n");
-    }
 
   for (ptr = ANTIC_STORE_LIST (smexpr); ptr; ptr = XEXP (ptr, 1))
     if (XEXP (ptr, 0) == del)
@@ -6379,6 +6368,20 @@ replace_store_insn (rtx reg, rtx del, basic_block bb, struct ls_expr *smexpr)
       XEXP (note, 0) = insn;
     }
 
+  /* Emit the insn AFTER all the notes are transferred.
+     This is cheaper since we avoid df rescanning for the note change.  */
+  insn = emit_insn_after (insn, del);
+
+  if (dump_file)
+    {
+      fprintf (dump_file,
+	       "STORE_MOTION  delete insn in BB %d:\n      ", bb->index);
+      print_inline_rtx (dump_file, del, 6);
+      fprintf (dump_file, "\nSTORE MOTION  replaced with insn:\n      ");
+      print_inline_rtx (dump_file, insn, 6);
+      fprintf (dump_file, "\n");
+    }
+
   delete_insn (del);
 
   /* Now we must handle REG_EQUAL notes whose contents is equal to the mem;