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5bb8798df6
Add a function to calculate the magic constants required to optimize signed 32-bit division. Since this optimization is not exclusive to any particular architecture, JitCommon seemed like a good place to put this.
34 lines
925 B
C++
34 lines
925 B
C++
// Copyright 2021 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include <gtest/gtest.h>
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#include "Core/PowerPC/JitCommon/DivUtils.h"
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using namespace JitCommon;
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TEST(DivUtils, Signed)
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{
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Magic m3 = SignedDivisionConstants(3);
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Magic m5 = SignedDivisionConstants(5);
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Magic m7 = SignedDivisionConstants(7);
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Magic minus3 = SignedDivisionConstants(-3);
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Magic minus5 = SignedDivisionConstants(-5);
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Magic minus7 = SignedDivisionConstants(-7);
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EXPECT_EQ(0x55555556, m3.multiplier);
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EXPECT_EQ(0, m3.shift);
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EXPECT_EQ(0x66666667, m5.multiplier);
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EXPECT_EQ(1, m5.shift);
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EXPECT_EQ(-0x6DB6DB6D, m7.multiplier);
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EXPECT_EQ(2, m7.shift);
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EXPECT_EQ(-0x55555556, minus3.multiplier);
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EXPECT_EQ(0, minus3.shift);
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EXPECT_EQ(-0x66666667, minus5.multiplier);
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EXPECT_EQ(1, minus5.shift);
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EXPECT_EQ(0x6DB6DB6D, minus7.multiplier);
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EXPECT_EQ(2, minus7.shift);
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}
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