1 files changed, 88 insertions, 0 deletions
diff --git a/test/Unit/clzti2_test.c b/test/Unit/clzti2_test.c
new file mode 100644
index 000000000..5aa2eb76b
--- /dev/null
+++ b/test/Unit/clzti2_test.c
@@ -0,0 +1,88 @@
+//===-- clzti2_test.c - Test __clzti2 -------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file tests __clzti2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#if __x86_64
+
+#include "int_lib.h"
+#include <stdio.h>
+
+// Returns: the number of leading 0-bits
+
+// Precondition: a != 0
+
+si_int __clzti2(ti_int a);
+
+int test__clzti2(ti_int a, si_int expected)
+{
+    si_int x = __clzti2(a);
+    if (x != expected)
+    {
+        twords at;
+        at.all = a;
+        printf("error in __clzti2(0x%llX%.16llX) = %d, expected %d\n",
+               at.high, at.low, x, expected);
+    }
+    return x != expected;
+}
+
+char assumption_1[sizeof(ti_int) == 2*sizeof(di_int)] = {0};
+
+#endif
+
+int main()
+{
+#if __x86_64
+    const int N = (int)(sizeof(ti_int) * CHAR_BIT);
+
+    if (test__clzti2(0x00000001, N-1))
+        return 1;
+    if (test__clzti2(0x00000002, N-2))
+        return 1;
+    if (test__clzti2(0x00000003, N-2))
+        return 1;
+    if (test__clzti2(0x00000004, N-3))
+        return 1;
+    if (test__clzti2(0x00000005, N-3))
+        return 1;
+    if (test__clzti2(0x0000000A, N-4))
+        return 1;
+    if (test__clzti2(0x1000000A, N*3/4+3))
+        return 1;
+    if (test__clzti2(0x2000000A, N*3/4+2))
+        return 1;
+    if (test__clzti2(0x6000000A, N*3/4+1))
+        return 1;
+    if (test__clzti2(0x8000000AuLL, N*3/4))
+        return 1;
+    if (test__clzti2(0x000005008000000AuLL, 85))
+        return 1;
+    if (test__clzti2(0x020005008000000AuLL, 70))
+        return 1;
+    if (test__clzti2(0x720005008000000AuLL, 65))
+        return 1;
+    if (test__clzti2(0x820005008000000AuLL, 64))
+        return 1;
+
+    if (test__clzti2(make_ti(0x0000000080000000LL, 0x8000000800000000LL), 32))
+        return 1;
+    if (test__clzti2(make_ti(0x0000000100000000LL, 0x8000000800000000LL), 31))
+        return 1;
+    if (test__clzti2(make_ti(0x1000000100000000LL, 0x8000000800000000LL), 3))
+        return 1;
+    if (test__clzti2(make_ti(0x7000000100000000LL, 0x8000000800000000LL), 1))
+        return 1;
+    if (test__clzti2(make_ti(0x8000000100000000LL, 0x8000000800000000LL), 0))
+        return 1;
+#endif
+   return 0;
+}