re PR c++/86240 (ice: unexpected expression absu_expr)

	PR c++/86240
	* constexpr.c (cxx_eval_constant_expression): Handle ABSU_EXPR.
	(fold_simple_1): Likewise.
	* error.c (dump_expr): Likewise.

	* g++.dg/pr86240.C: New test.

From-SVN: r261809

gcc/cp/ChangeLog

+2018-06-20  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/86240
+	* constexpr.c (cxx_eval_constant_expression): Handle ABSU_EXPR.
+	(fold_simple_1): Likewise.
+	* error.c (dump_expr): Likewise.
+
 2018-06-20  Nathan Sidwell  <nathan@acm.org>
 
 	PR c++/85634

gcc/cp/constexpr.c

@@ -4412,6 +4412,7 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
     case FLOAT_EXPR:
     case NEGATE_EXPR:
     case ABS_EXPR:
+    case ABSU_EXPR:
     case BIT_NOT_EXPR:
     case TRUTH_NOT_EXPR:
     case FIXED_CONVERT_EXPR:
@@ -5056,6 +5057,7 @@ fold_simple_1 (tree t)
       return fold_sizeof_expr (t);
 
     case ABS_EXPR:
+    case ABSU_EXPR:
     case CONJ_EXPR:
     case REALPART_EXPR:
     case IMAGPART_EXPR:

gcc/cp/error.c

@@ -2764,6 +2764,7 @@ dump_expr (cxx_pretty_printer *pp, tree t, int flags)
     case VEC_DELETE_EXPR:
     case MODOP_EXPR:
     case ABS_EXPR:
+    case ABSU_EXPR:
     case CONJ_EXPR:
     case VECTOR_CST:
     case FIXED_CST:

gcc/testsuite/ChangeLog

+2018-06-20  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/86240
+	* g++.dg/pr86240.C: New test.
+
 2018-06-20  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/86194

gcc/testsuite/g++.dg/pr86240.C

+// { dg-do compile }
+
+extern "C" int abs (int);
+struct a {
+  short b;
+} e;
+short c;
+bool
+foo ()
+{
+  return abs(c) >= e.b;
+}