re PR bootstrap/43403 (ICE in stage1 compiling __bswapdi2)

	PR bootstrap/43403
	* var-tracking.c (vt_init_cfa_base): Do nothing if
	cfa_base_rtx would be hard_frame_pointer_rtx or non-fixed
	register.

From-SVN: r157549

gcc/ChangeLog

+2010-03-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR bootstrap/43403
+	* var-tracking.c (vt_init_cfa_base): Do nothing if
+	cfa_base_rtx would be hard_frame_pointer_rtx or non-fixed
+	register.
+
 2010-03-18  Alexandre Oliva  <aoliva@redhat.com>
 
 	PR debug/42873

gcc/var-tracking.c

@@ -8004,6 +8004,12 @@ vt_init_cfa_base (void)
 #else
   cfa_base_rtx = arg_pointer_rtx;
 #endif
+  if (cfa_base_rtx == hard_frame_pointer_rtx
+      || !fixed_regs[REGNO (cfa_base_rtx)])
+    {
+      cfa_base_rtx = NULL_RTX;
+      return;
+    }
   if (!MAY_HAVE_DEBUG_INSNS)
     return;