compiler-rt/test/builtins/Unit/clzti2_test.c

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_clzti2
   3 // REQUIRES: int128
   4
   5 #include "int_lib.h"
   6 #include <stdio.h>
   7
   8 #ifdef CRT_HAS_128BIT
   9
  10 // Returns: the number of leading 0-bits
  11
  12 // Precondition: a != 0
  13
  14 COMPILER_RT_ABI int __clzti2(ti_int a);
  15
  16 int test__clzti2(ti_int a, int expected)
  17 {
  18     int x = __clzti2(a);
  19     if (x != expected)
  20     {
  21         twords at;
  22         at.all = a;
  23         printf("error in __clzti2(0x%llX%.16llX) = %d, expected %d\n",
  24                at.s.high, at.s.low, x, expected);
  25     }
  26     return x != expected;
  27 }
  28
  29 char assumption_1[sizeof(ti_int) == 2*sizeof(di_int)] = {0};
  30
  31 #endif
  32
  33 int main()
  34 {
  35 #ifdef CRT_HAS_128BIT
  36     const int N = (int)(sizeof(ti_int) * CHAR_BIT);
  37
  38     if (test__clzti2(0x00000001, N-1))
  39         return 1;
  40     if (test__clzti2(0x00000002, N-2))
  41         return 1;
  42     if (test__clzti2(0x00000003, N-2))
  43         return 1;
  44     if (test__clzti2(0x00000004, N-3))
  45         return 1;
  46     if (test__clzti2(0x00000005, N-3))
  47         return 1;
  48     if (test__clzti2(0x0000000A, N-4))
  49         return 1;
  50     if (test__clzti2(0x1000000A, N*3/4+3))
  51         return 1;
  52     if (test__clzti2(0x2000000A, N*3/4+2))
  53         return 1;
  54     if (test__clzti2(0x6000000A, N*3/4+1))
  55         return 1;
  56     if (test__clzti2(0x8000000AuLL, N*3/4))
  57         return 1;
  58     if (test__clzti2(0x000005008000000AuLL, 85))
  59         return 1;
  60     if (test__clzti2(0x020005008000000AuLL, 70))
  61         return 1;
  62     if (test__clzti2(0x720005008000000AuLL, 65))
  63         return 1;
  64     if (test__clzti2(0x820005008000000AuLL, 64))
  65         return 1;
  66
  67     if (test__clzti2(make_ti(0x0000000080000000LL, 0x8000000800000000LL), 32))
  68         return 1;
  69     if (test__clzti2(make_ti(0x0000000100000000LL, 0x8000000800000000LL), 31))
  70         return 1;
  71     if (test__clzti2(make_ti(0x1000000100000000LL, 0x8000000800000000LL), 3))
  72         return 1;
  73     if (test__clzti2(make_ti(0x7000000100000000LL, 0x8000000800000000LL), 1))
  74         return 1;
  75     if (test__clzti2(make_ti(0x8000000100000000LL, 0x8000000800000000LL), 0))
  76         return 1;
  77 #else
  78     printf("skipped\n");
  79 #endif
  80    return 0;
  81 }