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

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_clzdi2
   3 //===-- clzdi2_test.c - Test __clzdi2 -------------------------------------===//
   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 __clzdi2 for the compiler_rt library.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "int_lib.h"
  16 #include <stdio.h>
  17
  18 // Returns: the number of leading 0-bits
  19
  20 // Precondition: a != 0
  21
  22 COMPILER_RT_ABI si_int __clzdi2(di_int a);
  23
  24 int test__clzdi2(di_int a, si_int expected)
  25 {
  26     si_int x = __clzdi2(a);
  27     if (x != expected)
  28         printf("error in __clzdi2(0x%llX) = %d, expected %d\n", a, x, expected);
  29     return x != expected;
  30 }
  31
  32 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
  33
  34 int main()
  35 {
  36     const int N = (int)(sizeof(di_int) * CHAR_BIT);
  37 //    if (test__clzdi2(0x00000000, N))  // undefined
  38 //        return 1;
  39     if (test__clzdi2(0x00000001, N-1))
  40         return 1;
  41     if (test__clzdi2(0x00000002, N-2))
  42         return 1;
  43     if (test__clzdi2(0x00000003, N-2))
  44         return 1;
  45     if (test__clzdi2(0x00000004, N-3))
  46         return 1;
  47     if (test__clzdi2(0x00000005, N-3))
  48         return 1;
  49     if (test__clzdi2(0x0000000A, N-4))
  50         return 1;
  51     if (test__clzdi2(0x1000000A, N/2+3))
  52         return 1;
  53     if (test__clzdi2(0x2000000A, N/2+2))
  54         return 1;
  55     if (test__clzdi2(0x6000000A, N/2+1))
  56         return 1;
  57     if (test__clzdi2(0x8000000AuLL, N/2))
  58         return 1;
  59     if (test__clzdi2(0x000005008000000AuLL, 21))
  60         return 1;
  61     if (test__clzdi2(0x020005008000000AuLL, 6))
  62         return 1;
  63     if (test__clzdi2(0x720005008000000AuLL, 1))
  64         return 1;
  65     if (test__clzdi2(0x820005008000000AuLL, 0))
  66         return 1;
  67
  68    return 0;
  69 }