103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
// Copyright 2018 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 <cstring>
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#include <vector>
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#include "Common/BitUtils.h"
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#include "Common/CommonTypes.h"
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#include "Common/FloatUtils.h"
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#include "Common/x64ABI.h"
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#include "Core/PowerPC/Gekko.h"
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#include "Core/PowerPC/Jit64/Jit.h"
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#include "Core/PowerPC/Jit64Common/Jit64AsmCommon.h"
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#include "Core/PowerPC/Jit64Common/Jit64PowerPCState.h"
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#include <gtest/gtest.h>
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class TestCommonAsmRoutines : public CommonAsmRoutines
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{
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public:
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TestCommonAsmRoutines() : CommonAsmRoutines(jit)
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{
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using namespace Gen;
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AllocCodeSpace(4096);
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m_const_pool.Init(AllocChildCodeSpace(1024), 1024);
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const auto raw_frsqrte = reinterpret_cast<double (*)(double)>(AlignCode4());
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GenFrsqrte();
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wrapped_frsqrte = reinterpret_cast<u64 (*)(u64, UReg_FPSCR&)>(AlignCode4());
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ABI_PushRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8, 16);
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// We know the frsqrte implementation only accesses the fpscr. We manufacture a
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// PPCSTATE pointer so we read/write to our provided fpscr argument instead.
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XOR(32, R(RPPCSTATE), R(RPPCSTATE));
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LEA(64, RSCRATCH, PPCSTATE(fpscr));
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SUB(64, R(ABI_PARAM2), R(RSCRATCH));
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MOV(64, R(RPPCSTATE), R(ABI_PARAM2));
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// Call
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MOVQ_xmm(XMM0, R(ABI_PARAM1));
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ABI_CallFunction(raw_frsqrte);
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MOVQ_xmm(R(ABI_RETURN), XMM0);
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ABI_PopRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8, 16);
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RET();
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}
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u64 (*wrapped_frsqrte)(u64, UReg_FPSCR&);
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Jit64 jit;
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};
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TEST(Jit64, Frsqrte)
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{
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TestCommonAsmRoutines routines;
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const std::vector<u64> special_values{
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0x0000'0000'0000'0000, // positive zero
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0x0000'0000'0000'0001, // smallest positive denormal
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0x0000'0000'0100'0000,
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0x000F'FFFF'FFFF'FFFF, // largest positive denormal
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0x0010'0000'0000'0000, // smallest positive normal
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0x0010'0000'0000'0002,
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0x3FF0'0000'0000'0000, // 1.0
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0x7FEF'FFFF'FFFF'FFFF, // largest positive normal
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0x7FF0'0000'0000'0000, // positive infinity
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0x7FF0'0000'0000'0001, // first positive SNaN
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0x7FF7'FFFF'FFFF'FFFF, // last positive SNaN
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0x7FF8'0000'0000'0000, // first positive QNaN
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0x7FFF'FFFF'FFFF'FFFF, // last positive QNaN
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0x8000'0000'0000'0000, // negative zero
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0x8000'0000'0000'0001, // smallest negative denormal
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0x8000'0000'0100'0000,
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0x800F'FFFF'FFFF'FFFF, // largest negative denormal
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0x8010'0000'0000'0000, // smallest negative normal
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0x8010'0000'0000'0002,
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0xBFF0'0000'0000'0000, // -1.0
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0xFFEF'FFFF'FFFF'FFFF, // largest negative normal
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0xFFF0'0000'0000'0000, // negative infinity
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0xFFF0'0000'0000'0001, // first negative SNaN
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0xFFF7'FFFF'FFFF'FFFF, // last negative SNaN
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0xFFF8'0000'0000'0000, // first negative QNaN
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0xFFFF'FFFF'FFFF'FFFF, // last negative QNaN
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};
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UReg_FPSCR fpscr;
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for (u64 ivalue : special_values)
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{
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double dvalue = Common::BitCast<double>(ivalue);
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u64 expected = Common::BitCast<u64>(Common::ApproximateReciprocalSquareRoot(dvalue));
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u64 actual = routines.wrapped_frsqrte(ivalue, fpscr);
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printf("%016llx -> %016llx == %016llx\n", ivalue, actual, expected);
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EXPECT_EQ(expected, actual);
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}
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}
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