DRAFT test: Add 68-truncate-shift.

* lib/tests/scaffold/68-truncate-shift.c: New file.
* build-aux/check-mescc.sh (mes_tests): Add it.

build-aux/check-mescc.sh

@@ -136,6 +136,7 @@ lib/tests/scaffold/64-make-cell.c
 lib/tests/scaffold/65-read.c
 lib/tests/scaffold/66-local-char-array.c
 lib/tests/scaffold/67-m1-overflow-check.c
+lib/tests/scaffold/68-truncate-shift.c
 "
 
 tcc_tests="

lib/tests/scaffold/68-truncate-shift.c

@@ -0,0 +1,61 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2023 Andrius Štikonas <andrius@stikonas.eu>
+ * Copyright © 2023 Janneke Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <mes/lib.h>
+
+int
+main ()
+{
+  int a = 0x1001;
+  eputs ("a=");
+  eputs (ntoab (a, 16, 1));
+  eputs ("\n");
+
+  asm (";;//b = a << 20;");
+  int b = a << 20;
+  asm (";;//print b;");
+  eputs ("b=");
+  eputs (ntoab (b, 16, 1));
+  eputs ("\n");
+  if (b != 0x100000)
+    return 1;
+
+  asm (";;//c = b >> 20;");
+  int c = b >> 20;;
+  asm (";;//print c;");
+  eputs ("c=");
+  eputs (ntoab (c, 16, 1));
+  eputs ("\n");
+  if (c != 1)
+    return 2;
+
+  asm (";;//x = a << 20 >> 20;");
+  int x = a << 20 >> 20;
+  // printf ("x=%d\n", x);
+  asm (";;//print x;");
+  eputs ("x=");
+  eputs (ntoab (x, 16, 1));
+  eputs ("\n");
+  if (x != 1)
+    return 3;
+
+  return 0;
+}