--- gcc-4.5.3/gcc/config/i386/driver-i386.c.orig	2011-10-06 13:09:20.106942506 -0400
+++ gcc-4.5.3/gcc/config/i386/driver-i386.c	2011-10-06 13:10:41.142940398 -0400
@@ -573,8 +573,12 @@
 		/* If it is an unknown CPU with SSSE3, assume Core 2.  */
 		cpu = "core2";
 	      else if (has_sse3)
-		/* It is Core Duo.  */
-		cpu = "pentium-m";
+		if (has_longmode)
+		  /* It is Core 2 Duo */
+		  cpu = "core2";
+		else
+		  /* It is Core Duo.  */
+		  cpu = "pentium-m";
 	      else if (has_sse2)
 		/* It is Pentium M.  */
 		cpu = "pentium-m";