vendor/compiler-rt/compiler-rt-r224034

1 files changed, 51 insertions, 0 deletions

diff --git a/test/builtins/Unit/paritydi2_test.c b/test/builtins/Unit/paritydi2_test.c
new file mode 100644
index 0000000000000..5360e374d4398
--- /dev/null
+++ b/test/builtins/Unit/paritydi2_test.c
@@ -0,0 +1,51 @@
+//===-- paritydi2_test.c - Test __paritydi2 -------------------------------===//
+//
+//                     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 __paritydi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+// Returns: 1 if number of bits is odd else returns 0
+
+si_int __paritydi2(di_int a);
+
+int naive_parity(di_int a)
+{
+    int r = 0;
+    for (; a; a = a & (a - 1))
+        r = ~r;
+    return r & 1;
+}
+
+int test__paritydi2(di_int a)
+{
+    si_int x = __paritydi2(a);
+    si_int expected = naive_parity(a);
+    if (x != expected)
+        printf("error in __paritydi2(0x%llX) = %d, expected %d\n",
+               a, x, expected);
+    return x != expected;
+}
+
+char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
+char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
+
+int main()
+{
+    int i;
+    for (i = 0; i < 10000; ++i)
+        if (test__paritydi2(((di_int)rand() << 32) + rand()))
+            return 1;
+
+   return 0;
+}