compiler-rt/test/builtins/Unit/ffsti2_test.c

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_ffsti2
   3 // REQUIRES: int128
   4
   5 #include "int_lib.h"
   6 #include <stdio.h>
   7
   8 #ifdef CRT_HAS_128BIT
   9
  10 // Returns: the index of the least significant 1-bit in a, or
  11 // the value zero if a is zero. The least significant bit is index one.
  12
  13 COMPILER_RT_ABI int __ffsti2(ti_int a);
  14
  15 int 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
  28 char assumption_1[sizeof(ti_int) == 2*sizeof(di_int)] = {0};
  29
  30 #endif
  31
  32 int main()
  33 {
  34 #ifdef CRT_HAS_128BIT
  35     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 #else
  71     printf("skipped\n");
  72 #endif
  73    return 0;
  74 }