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

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_ffssi2
   3 //===-- ffssi2_test.c - Test __ffssi2 -------------------------------------===//
   4 //
   5 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   6 // See https://llvm.org/LICENSE.txt for license information.
   7 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   8 //
   9 //===----------------------------------------------------------------------===//
  10 //
  11 // This file tests __ffssi2 for the compiler_rt library.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "int_lib.h"
  16 #include <stdio.h>
  17
  18 // Returns: the index of the least significant 1-bit in a, or
  19 // the value zero if a is zero. The least significant bit is index one.
  20
  21 COMPILER_RT_ABI si_int __ffssi2(si_int a);
  22
  23 int test__ffssi2(si_int a, si_int expected)
  24 {
  25     si_int x = __ffssi2(a);
  26     if (x != expected)
  27         printf("error in __ffssi2(0x%X) = %d, expected %d\n", a, x, expected);
  28     return x != expected;
  29 }
  30
  31 int main()
  32 {
  33     if (test__ffssi2(0x00000000, 0))
  34         return 1;
  35     if (test__ffssi2(0x00000001, 1))
  36         return 1;
  37     if (test__ffssi2(0x00000002, 2))
  38         return 1;
  39     if (test__ffssi2(0x00000003, 1))
  40         return 1;
  41     if (test__ffssi2(0x00000004, 3))
  42         return 1;
  43     if (test__ffssi2(0x00000005, 1))
  44         return 1;
  45     if (test__ffssi2(0x0000000A, 2))
  46         return 1;
  47     if (test__ffssi2(0x10000000, 29))
  48         return 1;
  49     if (test__ffssi2(0x20000000, 30))
  50         return 1;
  51     if (test__ffssi2(0x60000000, 30))
  52         return 1;
  53     if (test__ffssi2(0x80000000u, 32))
  54         return 1;
  55
  56    return 0;
  57 }