@@ -35,6 +35,7 @@ TESTS+=chrl
TESTS+=rxsbg
TESTS+=ex-relative-long
TESTS+=ex-branch
+TESTS+=mxdb
cdsg: CFLAGS+=-pthread
cdsg: LDFLAGS+=-pthread
new file mode 100644
@@ -0,0 +1,30 @@
+/*
+ * Test the MXDB and MXDBR instructions.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <assert.h>
+#include <stdlib.h>
+
+int main(void)
+{
+ union {
+ double d[2];
+ long double ld;
+ } a;
+ double b;
+
+ a.d[0] = 1.2345;
+ a.d[1] = 999;
+ b = 6.789;
+ asm("mxdb %[a],%[b]" : [a] "+f" (a.ld) : [b] "R" (b));
+ assert(a.ld > 8.38 && a.ld < 8.39);
+
+ a.d[0] = 1.2345;
+ a.d[1] = 999;
+ b = 6.789;
+ asm("mxdbr %[a],%[b]" : [a] "+f" (a.ld) : [b] "f" (b));
+ assert(a.ld > 8.38 && a.ld < 8.39);
+
+ return EXIT_SUCCESS;
+}