compiler-rt/test/builtins/Unit/clzdi2_test.c

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_clzdi2
   3
   4 #include "int_lib.h"
   5 #include <stdio.h>
   6
   7 // Returns: the number of leading 0-bits
   8
   9 // Precondition: a != 0
  10
  11 COMPILER_RT_ABI int __clzdi2(di_int a);
  12
  13 int test__clzdi2(di_int a, int expected)
  14 {
  15     int x = __clzdi2(a);
  16     if (x != expected)
  17         printf("error in __clzdi2(0x%llX) = %d, expected %d\n", a, x, expected);
  18     return x != expected;
  19 }
  20
  21 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
  22
  23 int main()
  24 {
  25     const int N = (int)(sizeof(di_int) * CHAR_BIT);
  26 //    if (test__clzdi2(0x00000000, N))  // undefined
  27 //        return 1;
  28     if (test__clzdi2(0x00000001, N-1))
  29         return 1;
  30     if (test__clzdi2(0x00000002, N-2))
  31         return 1;
  32     if (test__clzdi2(0x00000003, N-2))
  33         return 1;
  34     if (test__clzdi2(0x00000004, N-3))
  35         return 1;
  36     if (test__clzdi2(0x00000005, N-3))
  37         return 1;
  38     if (test__clzdi2(0x0000000A, N-4))
  39         return 1;
  40     if (test__clzdi2(0x1000000A, N/2+3))
  41         return 1;
  42     if (test__clzdi2(0x2000000A, N/2+2))
  43         return 1;
  44     if (test__clzdi2(0x6000000A, N/2+1))
  45         return 1;
  46     if (test__clzdi2(0x8000000AuLL, N/2))
  47         return 1;
  48     if (test__clzdi2(0x000005008000000AuLL, 21))
  49         return 1;
  50     if (test__clzdi2(0x020005008000000AuLL, 6))
  51         return 1;
  52     if (test__clzdi2(0x720005008000000AuLL, 1))
  53         return 1;
  54     if (test__clzdi2(0x820005008000000AuLL, 0))
  55         return 1;
  56
  57    return 0;
  58 }