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 //===-- ffsti2_test.c - Test __ffsti2 -------------------------------------===//
   5 //
   6 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   7 // See https://llvm.org/LICENSE.txt for license information.
   8 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   9 //
  10 //===----------------------------------------------------------------------===//
  11 //
  12 // This file tests __ffsti2 for the compiler_rt library.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #include "int_lib.h"
  17 #include <stdio.h>
  18
  19 #ifdef CRT_HAS_128BIT
  20
  21 // Returns: the index of the least significant 1-bit in a, or
  22 // the value zero if a is zero. The least significant bit is index one.
  23
  24 COMPILER_RT_ABI si_int __ffsti2(ti_int a);
  25
  26 int test__ffsti2(ti_int a, si_int expected)
  27 {
  28     si_int x = __ffsti2(a);
  29     if (x != expected)
  30     {
  31         twords at;
  32         at.all = a;
  33         printf("error in __ffsti2(0x%llX%.16llX) = %d, expected %d\n",
  34                at.s.high, at.s.low, x, expected);
  35     }
  36     return x != expected;
  37 }
  38
  39 char assumption_1[sizeof(ti_int) == 2*sizeof(di_int)] = {0};
  40
  41 #endif
  42
  43 int main()
  44 {
  45 #ifdef CRT_HAS_128BIT
  46     if (test__ffsti2(0x00000000, 0))
  47         return 1;
  48     if (test__ffsti2(0x00000001, 1))
  49         return 1;
  50     if (test__ffsti2(0x00000002, 2))
  51         return 1;
  52     if (test__ffsti2(0x00000003, 1))
  53         return 1;
  54     if (test__ffsti2(0x00000004, 3))
  55         return 1;
  56     if (test__ffsti2(0x00000005, 1))
  57         return 1;
  58     if (test__ffsti2(0x0000000A, 2))
  59         return 1;
  60     if (test__ffsti2(0x10000000, 29))
  61         return 1;
  62     if (test__ffsti2(0x20000000, 30))
  63         return 1;
  64     if (test__ffsti2(0x60000000, 30))
  65         return 1;
  66     if (test__ffsti2(0x80000000uLL, 32))
  67         return 1;
  68     if (test__ffsti2(0x0000050000000000uLL, 41))
  69         return 1;
  70     if (test__ffsti2(0x0200080000000000uLL, 44))
  71         return 1;
  72     if (test__ffsti2(0x7200000000000000uLL, 58))
  73         return 1;
  74     if (test__ffsti2(0x8000000000000000uLL, 64))
  75         return 1;
  76     if (test__ffsti2(make_ti(0x8000000800000000uLL, 0), 100))
  77         return 1;
  78     if (test__ffsti2(make_ti(0x8000000000000000uLL, 0), 128))
  79         return 1;
  80
  81 #else
  82     printf("skipped\n");
  83 #endif
  84    return 0;
  85 }