re PR rtl-optimization/37769 (internal compiler error: in…

re PR rtl-optimization/37769 (internal compiler error: in reg_overlap_mentioned_for_reload_p, at reload.c:6525)

	PR rtl-optimization/37769
	* regmove.c (optimize_reg_copy_2): Update REG_INC note if needed.

From-SVN: r141354

gcc/ChangeLog

 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
 	unwind-dw2-Os-4-200.o.
 

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);
 		  }