compiler-rt/test/builtins/Unit/ffssi2_test.c

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_ffssi2
   3
   4 #include "int_lib.h"
   5 #include <stdio.h>
   6
   7 // Returns: the index of the least significant 1-bit in a, or
   8 // the value zero if a is zero. The least significant bit is index one.
   9
  10 COMPILER_RT_ABI int __ffssi2(si_int a);
  11
  12 int 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
  20 int 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 }