xref: /llvm-project/compiler-rt/test/builtins/Unit/clzdi2_test.c (revision 0ee439b705e82a4fe20e266bc8fea96d0e60e1ec)
1 // RUN: %clang_builtins %s %librt -o %t && %run %t
2 // REQUIRES: librt_has_clzdi2
3 
4 #include "int_lib.h"
5 #include <stdio.h>
6 
7 // Returns: the number of leading 0-bits
8 
9 // Precondition: a != 0
10 
11 COMPILER_RT_ABI int __clzdi2(di_int a);
12 
test__clzdi2(di_int a,int expected)13 int test__clzdi2(di_int a, int expected)
14 {
15     int x = __clzdi2(a);
16     if (x != expected)
17         printf("error in __clzdi2(0x%llX) = %d, expected %d\n", a, x, expected);
18     return x != expected;
19 }
20 
21 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
22 
main()23 int main()
24 {
25     const int N = (int)(sizeof(di_int) * CHAR_BIT);
26 //    if (test__clzdi2(0x00000000, N))  // undefined
27 //        return 1;
28     if (test__clzdi2(0x00000001, N-1))
29         return 1;
30     if (test__clzdi2(0x00000002, N-2))
31         return 1;
32     if (test__clzdi2(0x00000003, N-2))
33         return 1;
34     if (test__clzdi2(0x00000004, N-3))
35         return 1;
36     if (test__clzdi2(0x00000005, N-3))
37         return 1;
38     if (test__clzdi2(0x0000000A, N-4))
39         return 1;
40     if (test__clzdi2(0x1000000A, N/2+3))
41         return 1;
42     if (test__clzdi2(0x2000000A, N/2+2))
43         return 1;
44     if (test__clzdi2(0x6000000A, N/2+1))
45         return 1;
46     if (test__clzdi2(0x8000000AuLL, N/2))
47         return 1;
48     if (test__clzdi2(0x000005008000000AuLL, 21))
49         return 1;
50     if (test__clzdi2(0x020005008000000AuLL, 6))
51         return 1;
52     if (test__clzdi2(0x720005008000000AuLL, 1))
53         return 1;
54     if (test__clzdi2(0x820005008000000AuLL, 0))
55         return 1;
56 
57    return 0;
58 }
59