64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
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/* This file is part of the dynarmic project.
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* Copyright (c) 2018 MerryMage
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* This software may be used and distributed according to the terms of the GNU
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* General Public License version 2 or any later version.
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*/
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#include <tuple>
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#include <vector>
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#include <catch.hpp>
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#include "common/fp/mantissa_util.h"
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#include "common/safe_ops.h"
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#include "rand_int.h"
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using namespace Dynarmic;
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using namespace Dynarmic::FP;
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TEST_CASE("ResidualErrorOnRightShift", "[fp]") {
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const std::vector<std::tuple<u32, int, ResidualError>> test_cases {
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{0x00000001, 1, ResidualError::Half},
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{0x00000002, 1, ResidualError::Zero},
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{0x00000001, 2, ResidualError::LessThanHalf},
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{0x00000002, 2, ResidualError::Half},
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{0x00000003, 2, ResidualError::GreaterThanHalf},
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{0x00000004, 2, ResidualError::Zero},
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{0x00000005, 2, ResidualError::LessThanHalf},
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{0x00000006, 2, ResidualError::Half},
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{0x00000007, 2, ResidualError::GreaterThanHalf},
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};
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for (auto [mantissa, shift, expected_result] : test_cases) {
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const ResidualError result = ResidualErrorOnRightShift(mantissa, shift);
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REQUIRE(result == expected_result);
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}
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}
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TEST_CASE("ResidualErrorOnRightShift Randomized", "[fp]") {
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for (size_t test = 0; test < 100000; test++) {
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const u32 mantissa = RandInt<u32>(0, 0xFFFFFFFF);
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const int shift = RandInt<int>(-60, 60);
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const ResidualError result = ResidualErrorOnRightShift(mantissa, shift);
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const u64 calculated_error = Safe::ArithmeticShiftRightDouble(Common::SignExtend<32, u64>(mantissa), u64(0), shift);
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const ResidualError expected_result = [&]{
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constexpr u64 half_error = 0x8000'0000'0000'0000ull;
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if (calculated_error == 0) {
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return ResidualError::Zero;
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}
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if (calculated_error < half_error) {
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return ResidualError::LessThanHalf;
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}
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if (calculated_error == half_error) {
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return ResidualError::Half;
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}
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return ResidualError::GreaterThanHalf;
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}();
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INFO(std::hex << "mantissa " << mantissa << " shift " << shift << " calculated_error " << calculated_error);
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REQUIRE(result == expected_result);
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}
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}
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