Check SUBREG in prepare_call_arguments.

2011-03-17  H.J. Lu  <hongjiu.lu@intel.com>

	PR debug/48160
	* var-tracking.c (prepare_call_arguments): Check SUBREG.

From-SVN: r171108

gcc/ChangeLog

 2011-03-17  H.J. Lu  <hongjiu.lu@intel.com>
 
+	PR debug/48160
+	* var-tracking.c (prepare_call_arguments): Check SUBREG.
+
+2011-03-17  H.J. Lu  <hongjiu.lu@intel.com>
+
 	PR target/48171
 	* config/i386/i386.opt: Add Save to -mavx and -mfma.
 

gcc/var-tracking.c

@@ -5770,7 +5770,11 @@ prepare_call_arguments (basic_block bb, rtx insn)
 
 		    /* Try harder, when passing address of a constant
 		       pool integer it can be easily read back.  */
-		    val = CSELIB_VAL_PTR (XEXP (item, 1));
+		    item = XEXP (item, 1);
+		    if (GET_CODE (item) == SUBREG)
+		      item = SUBREG_REG (item);
+		    gcc_assert (GET_CODE (item) == VALUE);
+		    val = CSELIB_VAL_PTR (item);
 		    for (l = val->locs; l; l = l->next)
 		      if (GET_CODE (l->loc) == SYMBOL_REF
 			  && TREE_CONSTANT_POOL_ADDRESS_P (l->loc)