1 files changed, 62 insertions, 0 deletions
diff --git a/test/Unit/popcountsi2_test.c b/test/Unit/popcountsi2_test.c
new file mode 100644
index 000000000..3d91cde63
--- /dev/null
+++ b/test/Unit/popcountsi2_test.c
@@ -0,0 +1,62 @@
+//===-- popcountsi2_test.c - Test __popcountsi2 ---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file tests __popcountsi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+// Returns: count of 1 bits
+
+si_int __popcountsi2(si_int a);
+
+int naive_popcount(si_int a)
+{
+    int r = 0;
+    for (; a; a = (su_int)a >> 1)
+        r += a & 1;
+    return r;
+}
+
+int test__popcountsi2(si_int a)
+{
+    si_int x = __popcountsi2(a);
+    si_int expected = naive_popcount(a);
+    if (x != expected)
+        printf("error in __popcountsi2(0x%X) = %d, expected %d\n",
+               a, x, expected);
+    return x != expected;
+}
+
+char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
+
+int main()
+{
+    if (test__popcountsi2(0))
+        return 1;
+    if (test__popcountsi2(1))
+        return 1;
+    if (test__popcountsi2(2))
+        return 1;
+    if (test__popcountsi2(0xFFFFFFFD))
+        return 1;
+    if (test__popcountsi2(0xFFFFFFFE))
+        return 1;
+    if (test__popcountsi2(0xFFFFFFFF))
+        return 1;
+    int i;
+    for (i = 0; i < 10000; ++i)
+        if (test__popcountsi2(rand()))
+            return 1;
+
+   return 0;
+}