forked from OSchip/llvm-project
50 lines
2.1 KiB
C++
50 lines
2.1 KiB
C++
//===-- Unittests for Limits ----------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "utils/CPP/Limits.h"
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#include "utils/UnitTest/Test.h"
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// This just checks against the C spec, almost all implementations will surpass
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// this.
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TEST(LlvmLibcLimitsTest, LimitsFollowSpec) {
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<int>::max(), INT_MAX);
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<int>::min(), INT_MIN);
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<unsigned int>::max(), UINT_MAX);
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<long>::max(), LONG_MAX);
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<long>::min(), LONG_MIN);
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<unsigned long>::max(), ULONG_MAX);
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<long long>::max(), LLONG_MAX);
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<long long>::min(), LLONG_MIN);
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<unsigned long long>::max(),
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ULLONG_MAX);
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}
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// This checks that the current environment supports 128 bit integers.
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TEST(LlvmLibcLimitsTest, Int128Works) {
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__int128_t max128 = ~__uint128_t(0) >> 1;
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__int128_t min128 = (__int128_t(1) << 127);
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EXPECT_GT(__llvm_libc::cpp::NumericLimits<__int128_t>::max(),
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__int128_t(__llvm_libc::cpp::NumericLimits<long long>::max()));
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<__int128_t>::max(), max128);
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EXPECT_LT(__llvm_libc::cpp::NumericLimits<__int128_t>::min(),
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__int128_t(__llvm_libc::cpp::NumericLimits<long long>::min()));
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<__int128_t>::min(), min128);
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__uint128_t umax128 = ~__uint128_t(0);
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EXPECT_GT(
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__llvm_libc::cpp::NumericLimits<__uint128_t>::max(),
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__uint128_t(__llvm_libc::cpp::NumericLimits<unsigned long long>::max()));
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ASSERT_EQ(__llvm_libc::cpp::NumericLimits<__uint128_t>::max(), umax128);
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}
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