diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ecd90819eaf..1beb0d0af5c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2008-10-24  Kaz Kojima  <kkojima@gcc.gnu.org>
+
+	PR rtl-optimization/37769
+	* regmove.c (optimize_reg_copy_2): Update REG_INC note if needed.
+
 2008-10-24  Kaz Kojima  <kkojima@gcc.gnu.org>
 
 	* config/sh/t-sh: Use $(MULTILIB_CFLAGS) when compiling to
diff --git a/gcc/regmove.c b/gcc/regmove.c
index e25dbec7fe9..12b93fc2ff8 100644
--- a/gcc/regmove.c
+++ b/gcc/regmove.c
@@ -685,7 +685,15 @@ optimize_reg_copy_2 (rtx insn, rtx dest, rtx src)
 	      {
 		if (reg_mentioned_p (dest, PATTERN (q)))
 		  {
+		    rtx note;
+
 		    PATTERN (q) = replace_rtx (PATTERN (q), dest, src);
+		    note = FIND_REG_INC_NOTE (q, dest);
+		    if (note)
+		      {
+			remove_note (q, note);
+			add_reg_note (q, REG_INC, src);
+		      }
 		    df_insn_rescan (q);
 		  }