1 files changed, 68 insertions, 0 deletions
diff --git a/test/Unit/clzdi2_test.c b/test/Unit/clzdi2_test.c
new file mode 100644
index 000000000..24b85d8b7
--- /dev/null
+++ b/test/Unit/clzdi2_test.c
@@ -0,0 +1,68 @@
+//===-- clzdi2_test.c - Test __clzdi2 -------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file tests __clzdi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+#include <stdio.h>
+
+// Returns: the number of leading 0-bits
+
+// Precondition: a != 0
+
+si_int __clzdi2(di_int a);
+
+int test__clzdi2(di_int a, si_int expected)
+{
+    si_int x = __clzdi2(a);
+    if (x != expected)
+        printf("error in __clzdi2(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()
+{
+    const int N = (int)(sizeof(di_int) * CHAR_BIT);
+//    if (test__clzdi2(0x00000000, N))  // undefined
+//        return 1;
+    if (test__clzdi2(0x00000001, N-1))
+        return 1;
+    if (test__clzdi2(0x00000002, N-2))
+        return 1;
+    if (test__clzdi2(0x00000003, N-2))
+        return 1;
+    if (test__clzdi2(0x00000004, N-3))
+        return 1;
+    if (test__clzdi2(0x00000005, N-3))
+        return 1;
+    if (test__clzdi2(0x0000000A, N-4))
+        return 1;
+    if (test__clzdi2(0x1000000A, N/2+3))
+        return 1;
+    if (test__clzdi2(0x2000000A, N/2+2))
+        return 1;
+    if (test__clzdi2(0x6000000A, N/2+1))
+        return 1;
+    if (test__clzdi2(0x8000000AuLL, N/2))
+        return 1;
+    if (test__clzdi2(0x000005008000000AuLL, 21))
+        return 1;
+    if (test__clzdi2(0x020005008000000AuLL, 6))
+        return 1;
+    if (test__clzdi2(0x720005008000000AuLL, 1))
+        return 1;
+    if (test__clzdi2(0x820005008000000AuLL, 0))
+        return 1;
+
+   return 0;
+}