59 lines · c
1// RUN: %clang_builtins %s %librt -o %t && %run %t2// REQUIRES: librt_has_clzdi23 4#include "int_lib.h"5#include <stdio.h>6 7// Returns: the number of leading 0-bits8 9// Precondition: a != 010 11COMPILER_RT_ABI int __clzdi2(di_int a);12 13int 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 21char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};22 23int main()24{25 const int N = (int)(sizeof(di_int) * CHAR_BIT);26// if (test__clzdi2(0x00000000, N)) // undefined27// 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