1 //===-- clzdi2_test.c - Test __clzdi2 -------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. 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
21 COMPILER_RT_ABI si_int __clzdi2(di_int a);
22
test__clzdi2(di_int a,si_int expected)23 int 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
31 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
32
main()33 int 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