re PR tree-optimization/55890 (calling a builtin func through a cast triggers an ICE)

2013-01-12  Tom de Vries  <tom@codesourcery.com>

	PR middle-end/55890
	* calls.c (expand_call): Check if arg_nr is valid.

From-SVN: r195119

gcc/ChangeLog

+2013-01-12  Tom de Vries  <tom@codesourcery.com>
+
+	PR middle-end/55890
+	* calls.c (expand_call): Check if arg_nr is valid.
+
 2013-01-11  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	* doc/extend.texi (X86 Built-in Functions): Add whitespace in

gcc/calls.c

@@ -3134,7 +3134,9 @@ expand_call (tree exp, rtx target, int ignore)
 	  int arg_nr = return_flags & ERF_RETURN_ARG_MASK;
 	  if (PUSH_ARGS_REVERSED)
 	    arg_nr = num_actuals - arg_nr - 1;
-	  if (args[arg_nr].reg
+	  if (arg_nr >= 0
+	      && arg_nr < num_actuals
+	      && args[arg_nr].reg
 	      && valreg
 	      && REG_P (valreg)
 	      && GET_MODE (args[arg_nr].reg) == GET_MODE (valreg))