1 files changed, 66 insertions, 0 deletions
diff --git a/test/builtins/Unit/ffsdi2_test.c b/test/builtins/Unit/ffsdi2_test.c
new file mode 100644
index 000000000000..9041127d1a62
--- /dev/null
+++ b/test/builtins/Unit/ffsdi2_test.c
@@ -0,0 +1,66 @@
+//===-- ffsdi2_test.c - Test __ffsdi2 -------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file tests __ffsdi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+#include <stdio.h>
+
+// Returns: the index of the least significant 1-bit in a, or
+// the value zero if a is zero. The least significant bit is index one.
+
+si_int __ffsdi2(di_int a);
+
+int test__ffsdi2(di_int a, si_int expected)
+{
+    si_int x = __ffsdi2(a);
+    if (x != expected)
+        printf("error in __ffsdi2(0x%llX) = %d, expected %d\n", a, x, expected);
+    return x != expected;
+}
+
+char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
+
+int main()
+{
+    if (test__ffsdi2(0x00000000, 0))
+        return 1;
+    if (test__ffsdi2(0x00000001, 1))
+        return 1;
+    if (test__ffsdi2(0x00000002, 2))
+        return 1;
+    if (test__ffsdi2(0x00000003, 1))
+        return 1;
+    if (test__ffsdi2(0x00000004, 3))
+        return 1;
+    if (test__ffsdi2(0x00000005, 1))
+        return 1;
+    if (test__ffsdi2(0x0000000A, 2))
+        return 1;
+    if (test__ffsdi2(0x10000000, 29))
+        return 1;
+    if (test__ffsdi2(0x20000000, 30))
+        return 1;
+    if (test__ffsdi2(0x60000000, 30))
+        return 1;
+    if (test__ffsdi2(0x80000000uLL, 32))
+        return 1;
+    if (test__ffsdi2(0x0000050000000000uLL, 41))
+        return 1;
+    if (test__ffsdi2(0x0200080000000000uLL, 44))
+        return 1;
+    if (test__ffsdi2(0x7200000000000000uLL, 58))
+        return 1;
+    if (test__ffsdi2(0x8000000000000000uLL, 64))
+        return 1;
+
+   return 0;
+}