re PR debug/43304 (ICE on vmx/fft.c and vmx/7-01{,a}.c)

	PR debug/43304
	* var-tracking.c (vt_expand_loc_callback) <case SUBREG>: If dummy,
	call cselib_dummy_expand_value_rtx_cb instead of
	cselib_expand_value_rtx_cb.

From-SVN: r157315

gcc/ChangeLog

-2010-03-08  Jakub Jelinek  <jakub@redhat.com>
+2010-03-09  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/43304
+	* var-tracking.c (vt_expand_loc_callback) <case SUBREG>: If dummy,
+	call cselib_dummy_expand_value_rtx_cb instead of
+	cselib_expand_value_rtx_cb.
 
 	PR debug/43293
 	* config/i386/t-i386 (i386.o): Depend on debug.h and dwarf2out.h.

gcc/var-tracking.c

@@ -6560,6 +6560,16 @@ vt_expand_loc_callback (rtx x, bitmap regs, int max_depth, void *data)
   switch (GET_CODE (x))
     {
     case SUBREG:
+      if (dummy)
+	{
+	  if (cselib_dummy_expand_value_rtx_cb (SUBREG_REG (x), regs,
+						max_depth - 1,
+						vt_expand_loc_callback, data))
+	    return pc_rtx;
+	  else
+	    return NULL;
+	}
+
       subreg = cselib_expand_value_rtx_cb (SUBREG_REG (x), regs,
 					   max_depth - 1,
 					   vt_expand_loc_callback, data);
@@ -6567,9 +6577,6 @@ vt_expand_loc_callback (rtx x, bitmap regs, int max_depth, void *data)
       if (!subreg)
 	return NULL;
 
-      if (dummy)
-	return pc_rtx;
-
       result = simplify_gen_subreg (GET_MODE (x), subreg,
 				    GET_MODE (SUBREG_REG (x)),
 				    SUBREG_BYTE (x));