2 files changed, 25 insertions, 0 deletions
diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
index 79250f3..1d45427 100644
--- a/tests/tcg/s390x/Makefile.target
+++ b/tests/tcg/s390x/Makefile.target
@@ -26,6 +26,7 @@ TESTS+=branch-relative-long
 TESTS+=noexec
 TESTS+=div
 TESTS+=clst
+TESTS+=long-double
 
 Z13_TESTS=vistr
 $(Z13_TESTS): CFLAGS+=-march=z13 -O2
diff --git a/tests/tcg/s390x/long-double.c b/tests/tcg/s390x/long-double.c
new file mode 100644
index 0000000..757a626
--- /dev/null
+++ b/tests/tcg/s390x/long-double.c
@@ -0,0 +1,24 @@
+/*
+ * Perform some basic arithmetic with long double, as a sanity check.
+ * With small integral numbers, we can cross-check with integers.
+ */
+
+#include <assert.h>
+
+int main()
+{
+    int i, j;
+
+    for (i = 1; i < 5; i++) {
+        for (j = 1; j < 5; j++) {
+            long double la = (long double)i + j;
+            long double lm = (long double)i * j;
+            long double ls = (long double)i - j;
+
+            assert(la == i + j);
+            assert(lm == i * j);
+            assert(ls == i - j);
+        }
+    }
+    return 0;
+}