Index: Python/compile.c
===================================================================
--- Python/compile.c	(revision 75658)
+++ Python/compile.c	(working copy)
@@ -917,11 +917,10 @@
         /* _and_ to distinguish 0.0 from -0.0 e.g. on IEEE platforms */
         if (PyFloat_Check(o)) {
 		d = PyFloat_AS_DOUBLE(o);
-		p = (unsigned char*) &d;
 		/* all we need is to make the tuple different in either the 0.0
 		 * or -0.0 case from all others, just to avoid the "coercion".
 		 */
-		if (*p==0 && p[sizeof(double)-1]==0)
+		if (d == 0.0 && copysign(1.0, d) < 0.0)
 			t = PyTuple_Pack(3, o, o->ob_type, Py_None);
 		else
 			t = PyTuple_Pack(2, o, o->ob_type);