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 //===-- clzti2_test.c - Test __clzti2 -------------------------------------===//
   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 __clzti2 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 number of leading 0-bits
  22
  23 // Precondition: a != 0
  24
  25 COMPILER_RT_ABI si_int __clzti2(ti_int a);
  26
  27 int test__clzti2(ti_int a, si_int expected)
  28 {
  29     si_int x = __clzti2(a);
  30     if (x != expected)
  31     {
  32         twords at;
  33         at.all = a;
  34         printf("error in __clzti2(0x%llX%.16llX) = %d, expected %d\n",
  35                at.s.high, at.s.low, x, expected);
  36     }
  37     return x != expected;
  38 }
  39
  40 char assumption_1[sizeof(ti_int) == 2*sizeof(di_int)] = {0};
  41
  42 #endif
  43
  44 int main()
  45 {
  46 #ifdef CRT_HAS_128BIT
  47     const int N = (int)(sizeof(ti_int) * CHAR_BIT);
  48
  49     if (test__clzti2(0x00000001, N-1))
  50         return 1;
  51     if (test__clzti2(0x00000002, N-2))
  52         return 1;
  53     if (test__clzti2(0x00000003, N-2))
  54         return 1;
  55     if (test__clzti2(0x00000004, N-3))
  56         return 1;
  57     if (test__clzti2(0x00000005, N-3))
  58         return 1;
  59     if (test__clzti2(0x0000000A, N-4))
  60         return 1;
  61     if (test__clzti2(0x1000000A, N*3/4+3))
  62         return 1;
  63     if (test__clzti2(0x2000000A, N*3/4+2))
  64         return 1;
  65     if (test__clzti2(0x6000000A, N*3/4+1))
  66         return 1;
  67     if (test__clzti2(0x8000000AuLL, N*3/4))
  68         return 1;
  69     if (test__clzti2(0x000005008000000AuLL, 85))
  70         return 1;
  71     if (test__clzti2(0x020005008000000AuLL, 70))
  72         return 1;
  73     if (test__clzti2(0x720005008000000AuLL, 65))
  74         return 1;
  75     if (test__clzti2(0x820005008000000AuLL, 64))
  76         return 1;
  77
  78     if (test__clzti2(make_ti(0x0000000080000000LL, 0x8000000800000000LL), 32))
  79         return 1;
  80     if (test__clzti2(make_ti(0x0000000100000000LL, 0x8000000800000000LL), 31))
  81         return 1;
  82     if (test__clzti2(make_ti(0x1000000100000000LL, 0x8000000800000000LL), 3))
  83         return 1;
  84     if (test__clzti2(make_ti(0x7000000100000000LL, 0x8000000800000000LL), 1))
  85         return 1;
  86     if (test__clzti2(make_ti(0x8000000100000000LL, 0x8000000800000000LL), 0))
  87         return 1;
  88 #else
  89     printf("skipped\n");
  90 #endif
  91    return 0;
  92 }