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//===-- Unittests for math_extras -----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/__support/UInt128.h" // UInt<128>
#include "src/__support/integer_literals.h"
#include "src/__support/math_extras.h"
#include "test/UnitTest/Test.h"
namespace LIBC_NAMESPACE {
// TODO: add UInt<128> support.
using UnsignedTypesNoBigInt = testing::TypeList<
#if defined(LIBC_TYPES_HAS_INT128)
__uint128_t,
#endif // LIBC_TYPES_HAS_INT128
unsigned char, unsigned short, unsigned int, unsigned long,
unsigned long long, UInt<128>>;
TEST(LlvmLibcBlockMathExtrasTest, mask_trailing_ones) {
EXPECT_EQ(0_u8, (mask_leading_ones<uint8_t, 0>()));
EXPECT_EQ(0_u8, (mask_trailing_ones<uint8_t, 0>()));
EXPECT_EQ(0_u16, (mask_leading_ones<uint16_t, 0>()));
EXPECT_EQ(0_u16, (mask_trailing_ones<uint16_t, 0>()));
EXPECT_EQ(0_u32, (mask_leading_ones<uint32_t, 0>()));
EXPECT_EQ(0_u32, (mask_trailing_ones<uint32_t, 0>()));
EXPECT_EQ(0_u64, (mask_leading_ones<uint64_t, 0>()));
EXPECT_EQ(0_u64, (mask_trailing_ones<uint64_t, 0>()));
EXPECT_EQ(0x00000003_u32, (mask_trailing_ones<uint32_t, 2>()));
EXPECT_EQ(0xC0000000_u32, (mask_leading_ones<uint32_t, 2>()));
EXPECT_EQ(0x000007FF_u32, (mask_trailing_ones<uint32_t, 11>()));
EXPECT_EQ(0xFFE00000_u32, (mask_leading_ones<uint32_t, 11>()));
EXPECT_EQ(0xFFFFFFFF_u32, (mask_trailing_ones<uint32_t, 32>()));
EXPECT_EQ(0xFFFFFFFF_u32, (mask_leading_ones<uint32_t, 32>()));
EXPECT_EQ(0xFFFFFFFFFFFFFFFF_u64, (mask_trailing_ones<uint64_t, 64>()));
EXPECT_EQ(0xFFFFFFFFFFFFFFFF_u64, (mask_leading_ones<uint64_t, 64>()));
EXPECT_EQ(0x0000FFFFFFFFFFFF_u64, (mask_trailing_ones<uint64_t, 48>()));
EXPECT_EQ(0xFFFFFFFFFFFF0000_u64, (mask_leading_ones<uint64_t, 48>()));
EXPECT_EQ(0_u128, (mask_trailing_ones<UInt128, 0>()));
EXPECT_EQ(0_u128, (mask_leading_ones<UInt128, 0>()));
EXPECT_EQ(0x00000000000000007FFFFFFFFFFFFFFF_u128,
(mask_trailing_ones<UInt128, 63>()));
EXPECT_EQ(0xFFFFFFFFFFFFFFFE0000000000000000_u128,
(mask_leading_ones<UInt128, 63>()));
EXPECT_EQ(0x0000000000000000FFFFFFFFFFFFFFFF_u128,
(mask_trailing_ones<UInt128, 64>()));
EXPECT_EQ(0xFFFFFFFFFFFFFFFF0000000000000000_u128,
(mask_leading_ones<UInt128, 64>()));
EXPECT_EQ(0x0000000000000001FFFFFFFFFFFFFFFF_u128,
(mask_trailing_ones<UInt128, 65>()));
EXPECT_EQ(0xFFFFFFFFFFFFFFFF8000000000000000_u128,
(mask_leading_ones<UInt128, 65>()));
EXPECT_EQ(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF_u128,
(mask_trailing_ones<UInt128, 128>()));
EXPECT_EQ(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF_u128,
(mask_leading_ones<UInt128, 128>()));
}
TYPED_TEST(LlvmLibcBitTest, FirstLeadingZero, UnsignedTypesNoBigInt) {
EXPECT_EQ(first_leading_zero<T>(cpp::numeric_limits<T>::max()), 0);
for (int i = 0U; i != cpp::numeric_limits<T>::digits; ++i)
EXPECT_EQ(first_leading_zero<T>(~(T(1) << i)),
cpp::numeric_limits<T>::digits - i);
}
TYPED_TEST(LlvmLibcBitTest, FirstLeadingOne, UnsignedTypesNoBigInt) {
EXPECT_EQ(first_leading_one<T>(static_cast<T>(0)), 0);
for (int i = 0U; i != cpp::numeric_limits<T>::digits; ++i)
EXPECT_EQ(first_leading_one<T>(T(1) << i),
cpp::numeric_limits<T>::digits - i);
}
TYPED_TEST(LlvmLibcBitTest, FirstTrailingZero, UnsignedTypesNoBigInt) {
EXPECT_EQ(first_trailing_zero<T>(cpp::numeric_limits<T>::max()), 0);
for (int i = 0U; i != cpp::numeric_limits<T>::digits; ++i)
EXPECT_EQ(first_trailing_zero<T>(~(T(1) << i)), i + 1);
}
TYPED_TEST(LlvmLibcBitTest, FirstTrailingOne, UnsignedTypesNoBigInt) {
EXPECT_EQ(first_trailing_one<T>(cpp::numeric_limits<T>::max()), 0);
for (int i = 0U; i != cpp::numeric_limits<T>::digits; ++i)
EXPECT_EQ(first_trailing_one<T>(T(1) << i), i + 1);
}
TYPED_TEST(LlvmLibcBitTest, CountZeros, UnsignedTypesNoBigInt) {
EXPECT_EQ(count_zeros(T(0)), cpp::numeric_limits<T>::digits);
for (int i = 0; i != cpp::numeric_limits<T>::digits; ++i)
EXPECT_EQ(count_zeros<T>(cpp::numeric_limits<T>::max() >> i), i);
}
using UnsignedTypes = testing::TypeList<
#if defined(__SIZEOF_INT128__)
__uint128_t,
#endif
unsigned char, unsigned short, unsigned int, unsigned long,
unsigned long long>;
TYPED_TEST(LlvmLibcBlockMathExtrasTest, add_overflow, UnsignedTypes) {
constexpr T ZERO = cpp::numeric_limits<T>::min();
constexpr T ONE(1);
constexpr T MAX = cpp::numeric_limits<T>::max();
constexpr T BEFORE_MAX = MAX - 1;
const struct {
T lhs;
T rhs;
T sum;
bool carry;
} TESTS[] = {
{ZERO, ONE, ONE, false}, // 0x00 + 0x01 = 0x01
{BEFORE_MAX, ONE, MAX, false}, // 0xFE + 0x01 = 0xFF
{MAX, ONE, ZERO, true}, // 0xFF + 0x01 = 0x00 (carry)
{MAX, MAX, BEFORE_MAX, true}, // 0xFF + 0xFF = 0xFE (carry)
};
for (auto tc : TESTS) {
T sum;
bool carry = add_overflow<T>(tc.lhs, tc.rhs, sum);
EXPECT_EQ(sum, tc.sum);
EXPECT_EQ(carry, tc.carry);
}
}
TYPED_TEST(LlvmLibcBlockMathExtrasTest, sub_overflow, UnsignedTypes) {
constexpr T ZERO = cpp::numeric_limits<T>::min();
constexpr T ONE(1);
constexpr T MAX = cpp::numeric_limits<T>::max();
constexpr T BEFORE_MAX = MAX - 1;
const struct {
T lhs;
T rhs;
T sub;
bool carry;
} TESTS[] = {
{ONE, ZERO, ONE, false}, // 0x01 - 0x00 = 0x01
{MAX, MAX, ZERO, false}, // 0xFF - 0xFF = 0x00
{ZERO, ONE, MAX, true}, // 0x00 - 0x01 = 0xFF (carry)
{BEFORE_MAX, MAX, MAX, true}, // 0xFE - 0xFF = 0xFF (carry)
};
for (auto tc : TESTS) {
T sub;
bool carry = sub_overflow<T>(tc.lhs, tc.rhs, sub);
EXPECT_EQ(sub, tc.sub);
EXPECT_EQ(carry, tc.carry);
}
}
} // namespace LIBC_NAMESPACE
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