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Merge pull request #12259 from Sintendo/frsqrte-unit-test

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UnitTests: Test frsqrte against known values
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Tilka 2023-11-04 20:10:23 +00:00 committed by GitHub
commit b7b8f46832
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35
Source/UnitTests/Common/FloatUtilsTest.cpp
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@ -1,6 +1,7 @@
// Copyright 2018 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <array>
#include <limits>
#include <random>
@ -9,6 +10,8 @@
#include "Common/BitUtils.h"
#include "Common/FloatUtils.h"
#include "../Core/PowerPC/TestValues.h"
TEST(FloatUtils, IsQNAN)
{
EXPECT_TRUE(Common::IsQNAN(std::numeric_limits<double>::quiet_NaN()));
@ -62,3 +65,35 @@ TEST(FloatUtils, FlushToZero)
EXPECT_EQ(i_tmp, Common::BitCast<u32>(Common::FlushToZero(Common::BitCast<float>(i_tmp))));
}
}
TEST(FloatUtils, ApproximateReciprocalSquareRoot)
{
constexpr std::array<u64, 57> expected_values{
0x7FF0'0000'0000'0000, 0x617F'FE80'0000'0000, 0x60BF'FE80'0000'0000, 0x5FE0'0008'2C00'0000,
0x5FDF'FE80'0000'0000, 0x5FDF'FE80'0000'0000, 0x3FEF'FE80'0000'0000, 0x1FF0'0008'2C00'0000,
0x0000'0000'0000'0000, 0x7FF8'0000'0000'0001, 0x7FFF'FFFF'FFFF'FFFF, 0x7FF8'0000'0000'0000,
0x7FFF'FFFF'FFFF'FFFF, 0xFFF0'0000'0000'0000, 0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000,
0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000,
0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000, 0xFFF8'0000'0000'0001, 0xFFFF'FFFF'FFFF'FFFF,
0xFFF8'0000'0000'0000, 0xFFFF'FFFF'FFFF'FFFF, 0x43E6'9FA0'0000'0000, 0x43DF'FE80'0000'0000,
0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000, 0x43E6'9360'6000'0000, 0x43DF'ED30'7000'0000,
0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000, 0x44A6'9FA0'0000'0000, 0x4496'9FA0'0000'0000,
0x448F'FE80'0000'0000, 0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000,
0x44A6'9360'6000'0000, 0x4496'9360'6000'0000, 0x448F'ED30'7000'0000, 0x7FF8'0000'0000'0000,
0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000, 0x3C06'9FA0'0000'0000, 0x3BFF'FE80'0000'0000,
0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000, 0x43EF'FE80'0000'0000, 0x43F6'9FA0'0000'0000,
0x7FF8'0000'0000'0000, 0x7FF8'0000'0000'0000, 0x3FEA'2040'0000'0000, 0x3FA0'3108'0000'0000,
0x7FF8'0000'0000'0000};
for (int i = 0; i < double_test_values.size(); ++i)
{
u64 ivalue = double_test_values[i];
double dvalue = Common::BitCast<double>(ivalue);
u64 expected = expected_values[i];
u64 actual = Common::BitCast<u64>(Common::ApproximateReciprocalSquareRoot(dvalue));
EXPECT_EQ(expected, actual);
}
}