1//===-- clzdi2_test.c - Test __clzdi2 -------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file tests __clzdi2 for the compiler_rt library.
11//
12//===----------------------------------------------------------------------===//
13
14#include "int_lib.h"
15#include <stdio.h>
16
17// Returns: the number of leading 0-bits
18
19// Precondition: a != 0
20
21si_int __clzdi2(di_int a);
22
23int test__clzdi2(di_int a, si_int expected)
24{
25    si_int x = __clzdi2(a);
26    if (x != expected)
27        printf("error in __clzdi2(0x%llX) = %d, expected %d\n", a, x, expected);
28    return x != expected;
29}
30
31char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
32
33int main()
34{
35    const int N = (int)(sizeof(di_int) * CHAR_BIT);
36//    if (test__clzdi2(0x00000000, N))  // undefined
37//        return 1;
38    if (test__clzdi2(0x00000001, N-1))
39        return 1;
40    if (test__clzdi2(0x00000002, N-2))
41        return 1;
42    if (test__clzdi2(0x00000003, N-2))
43        return 1;
44    if (test__clzdi2(0x00000004, N-3))
45        return 1;
46    if (test__clzdi2(0x00000005, N-3))
47        return 1;
48    if (test__clzdi2(0x0000000A, N-4))
49        return 1;
50    if (test__clzdi2(0x1000000A, N/2+3))
51        return 1;
52    if (test__clzdi2(0x2000000A, N/2+2))
53        return 1;
54    if (test__clzdi2(0x6000000A, N/2+1))
55        return 1;
56    if (test__clzdi2(0x8000000AuLL, N/2))
57        return 1;
58    if (test__clzdi2(0x000005008000000AuLL, 21))
59        return 1;
60    if (test__clzdi2(0x020005008000000AuLL, 6))
61        return 1;
62    if (test__clzdi2(0x720005008000000AuLL, 1))
63        return 1;
64    if (test__clzdi2(0x820005008000000AuLL, 0))
65        return 1;
66
67   return 0;
68}
69