1 // RUN: %clang_builtins %s %librt -o %t && %run %t
2 //===-- clzdi2_test.c - Test __clzdi2 -------------------------------------===//
4 // The LLVM Compiler Infrastructure
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 // This file tests __clzdi2 for the compiler_rt library.
13 //===----------------------------------------------------------------------===//
18 // Returns: the number of leading 0-bits
20 // Precondition: a != 0
22 COMPILER_RT_ABI si_int __clzdi2(di_int a);
24 int test__clzdi2(di_int a, si_int expected)
26 si_int x = __clzdi2(a);
28 printf("error in __clzdi2(0x%llX) = %d, expected %d\n", a, x, expected);
32 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
36 const int N = (int)(sizeof(di_int) * CHAR_BIT);
37 // if (test__clzdi2(0x00000000, N)) // undefined
39 if (test__clzdi2(0x00000001, N-1))
41 if (test__clzdi2(0x00000002, N-2))
43 if (test__clzdi2(0x00000003, N-2))
45 if (test__clzdi2(0x00000004, N-3))
47 if (test__clzdi2(0x00000005, N-3))
49 if (test__clzdi2(0x0000000A, N-4))
51 if (test__clzdi2(0x1000000A, N/2+3))
53 if (test__clzdi2(0x2000000A, N/2+2))
55 if (test__clzdi2(0x6000000A, N/2+1))
57 if (test__clzdi2(0x8000000AuLL, N/2))
59 if (test__clzdi2(0x000005008000000AuLL, 21))
61 if (test__clzdi2(0x020005008000000AuLL, 6))
63 if (test__clzdi2(0x720005008000000AuLL, 1))
65 if (test__clzdi2(0x820005008000000AuLL, 0))