libc/test/src/__support/CPP/limits_test.cpp

   1 //===-- Unittests for Limits ----------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/__support/CPP/limits.h"
  10 #include "src/__support/UInt.h"
  11 #include "test/UnitTest/Test.h"
  12
  13 namespace LIBC_NAMESPACE {
  14
  15 // This just checks against the C spec, almost all implementations will surpass
  16 // this.
  17 TEST(LlvmLibcLimitsTest, LimitsFollowSpec) {
  18   ASSERT_EQ(cpp::numeric_limits<int>::max(), INT_MAX);
  19   ASSERT_EQ(cpp::numeric_limits<int>::min(), INT_MIN);
  20
  21   ASSERT_EQ(cpp::numeric_limits<unsigned int>::max(), UINT_MAX);
  22
  23   ASSERT_EQ(cpp::numeric_limits<long>::max(), LONG_MAX);
  24   ASSERT_EQ(cpp::numeric_limits<long>::min(), LONG_MIN);
  25
  26   ASSERT_EQ(cpp::numeric_limits<unsigned long>::max(), ULONG_MAX);
  27
  28   ASSERT_EQ(cpp::numeric_limits<long long>::max(), LLONG_MAX);
  29   ASSERT_EQ(cpp::numeric_limits<long long>::min(), LLONG_MIN);
  30
  31   ASSERT_EQ(cpp::numeric_limits<unsigned long long>::max(), ULLONG_MAX);
  32 }
  33
  34 TEST(LlvmLibcLimitsTest, UInt128Limits) {
  35   auto umax128 = cpp::numeric_limits<LIBC_NAMESPACE::cpp::UInt<128>>::max();
  36   auto umax64 =
  37       LIBC_NAMESPACE::cpp::UInt<128>(cpp::numeric_limits<uint64_t>::max());
  38   EXPECT_GT(umax128, umax64);
  39   ASSERT_EQ(~LIBC_NAMESPACE::cpp::UInt<128>(0), umax128);
  40 #ifdef __SIZEOF_INT128__
  41   ASSERT_EQ(~__uint128_t(0), cpp::numeric_limits<__uint128_t>::max());
  42 #endif
  43 }
  44
  45 } // namespace LIBC_NAMESPACE