75 lines · c
1// RUN: %clang_builtins %s %librt -o %t && %run %t2// REQUIRES: librt_has_ffsti23// REQUIRES: int1284 5#include "int_lib.h"6#include <stdio.h>7 8#ifdef CRT_HAS_128BIT9 10// Returns: the index of the least significant 1-bit in a, or11// the value zero if a is zero. The least significant bit is index one.12 13COMPILER_RT_ABI int __ffsti2(ti_int a);14 15int test__ffsti2(ti_int a, int expected)16{17 int x = __ffsti2(a);18 if (x != expected)19 {20 twords at;21 at.all = a;22 printf("error in __ffsti2(0x%llX%.16llX) = %d, expected %d\n",23 at.s.high, at.s.low, x, expected);24 }25 return x != expected;26}27 28char assumption_1[sizeof(ti_int) == 2*sizeof(di_int)] = {0};29 30#endif31 32int main()33{34#ifdef CRT_HAS_128BIT35 if (test__ffsti2(0x00000000, 0))36 return 1;37 if (test__ffsti2(0x00000001, 1))38 return 1;39 if (test__ffsti2(0x00000002, 2))40 return 1;41 if (test__ffsti2(0x00000003, 1))42 return 1;43 if (test__ffsti2(0x00000004, 3))44 return 1;45 if (test__ffsti2(0x00000005, 1))46 return 1;47 if (test__ffsti2(0x0000000A, 2))48 return 1;49 if (test__ffsti2(0x10000000, 29))50 return 1;51 if (test__ffsti2(0x20000000, 30))52 return 1;53 if (test__ffsti2(0x60000000, 30))54 return 1;55 if (test__ffsti2(0x80000000uLL, 32))56 return 1;57 if (test__ffsti2(0x0000050000000000uLL, 41))58 return 1;59 if (test__ffsti2(0x0200080000000000uLL, 44))60 return 1;61 if (test__ffsti2(0x7200000000000000uLL, 58))62 return 1;63 if (test__ffsti2(0x8000000000000000uLL, 64))64 return 1;65 if (test__ffsti2(make_ti(0x8000000800000000uLL, 0), 100))66 return 1;67 if (test__ffsti2(make_ti(0x8000000000000000uLL, 0), 128))68 return 1;69 70#else71 printf("skipped\n");72#endif73 return 0;74}75