re PR c++/83490 (ICE in find_call_stack_args, at dce.c:392)

	PR c++/83490
	* calls.c (compute_argument_addresses): Ignore TYPE_EMPTY_P arguments.

	* g++.dg/abi/empty29.C: New test.

From-SVN: r255852

gcc/ChangeLog

+2017-12-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/83490
+	* calls.c (compute_argument_addresses): Ignore TYPE_EMPTY_P arguments.
+
 2017-12-20  Julia Koval  <julia.koval@intel.com>
 
 	* common/config/i386/i386-common.c (OPTION_MASK_ISA_VPCLMULQDQ_SET,

gcc/calls.c

@@ -2365,6 +2365,9 @@ compute_argument_addresses (struct arg_data *args, rtx argblock, int num_actuals
 	      && args[i].partial == 0)
 	    continue;
 
+	  if (TYPE_EMPTY_P (TREE_TYPE (args[i].tree_value)))
+	    continue;
+
 	  /* Pointer Bounds are never passed on the stack.  */
 	  if (POINTER_BOUNDS_P (args[i].tree_value))
 	    continue;

gcc/testsuite/ChangeLog

+2017-12-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/83490
+	* g++.dg/abi/empty29.C: New test.
+
 2017-12-20  Martin Liska  <mliska@suse.cz>
 
 	PR middle-end/82404

gcc/testsuite/g++.dg/abi/empty29.C

+// PR c++/83490
+// { dg-do compile { target i?86-*-* x86_64-*-* } }
+// { dg-options "-fipa-icf-functions -Og -maccumulate-outgoing-args" }
+
+struct A {};
+A operator < (A, A) { return A (); }
+A operator > (A, A) { return A (); }