47 lines · c
1// RUN: %clang_builtins %s %librt -o %t && %run %t2// REQUIRES: librt_has_ffssi23 4#include "int_lib.h"5#include <stdio.h>6 7// Returns: the index of the least significant 1-bit in a, or8// the value zero if a is zero. The least significant bit is index one.9 10COMPILER_RT_ABI int __ffssi2(si_int a);11 12int test__ffssi2(si_int a, int expected)13{14 int x = __ffssi2(a);15 if (x != expected)16 printf("error in __ffssi2(0x%X) = %d, expected %d\n", a, x, expected);17 return x != expected;18}19 20int main()21{22 if (test__ffssi2(0x00000000, 0))23 return 1;24 if (test__ffssi2(0x00000001, 1))25 return 1;26 if (test__ffssi2(0x00000002, 2))27 return 1;28 if (test__ffssi2(0x00000003, 1))29 return 1;30 if (test__ffssi2(0x00000004, 3))31 return 1;32 if (test__ffssi2(0x00000005, 1))33 return 1;34 if (test__ffssi2(0x0000000A, 2))35 return 1;36 if (test__ffssi2(0x10000000, 29))37 return 1;38 if (test__ffssi2(0x20000000, 30))39 return 1;40 if (test__ffssi2(0x60000000, 30))41 return 1;42 if (test__ffssi2(0x80000000u, 32))43 return 1;44 45 return 0;46}47