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82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
// Copyright 2025 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <bit>
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#include "Common/CommonTypes.h"
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#include "Common/FloatUtils.h"
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#include "Common/ScopeGuard.h"
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#include "Common/x64ABI.h"
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#include "Core/Core.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 "Core/System.h"
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#include "../TestValues.h"
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#include <fmt/format.h>
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#include <gtest/gtest.h>
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namespace
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{
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class TestFres : public CommonAsmRoutines
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{
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public:
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explicit TestFres(Core::System& system) : CommonAsmRoutines(jit), jit(system)
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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_fres = reinterpret_cast<double (*)(double)>(AlignCode4());
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GenFres();
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wrapped_fres = reinterpret_cast<u64 (*)(u64, const UReg_FPSCR&)>(AlignCode4());
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ABI_PushRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8, 16);
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// We know that the only part of PowerPCState that the fres routine accesses is the fpscr.
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// We manufacture a PPCSTATE pointer so it reads from our provided fpscr instead.
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MOV(64, R(RPPCSTATE), R(ABI_PARAM2));
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SUB(64, R(RPPCSTATE), Imm32(PPCSTATE_OFF(fpscr)));
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// Call
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MOVQ_xmm(XMM0, R(ABI_PARAM1));
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ABI_CallFunction(raw_fres);
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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_fres)(u64, const UReg_FPSCR&);
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Jit64 jit;
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};
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} // namespace
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TEST(Jit64, Fres)
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{
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Core::DeclareAsCPUThread();
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Common::ScopeGuard cpu_thread_guard([] { Core::UndeclareAsCPUThread(); });
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TestFres test(Core::System::GetInstance());
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// FPSCR with NI set
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const UReg_FPSCR fpscr = UReg_FPSCR(0x00000004);
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for (const u64 ivalue : double_test_values)
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{
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const double dvalue = std::bit_cast<double>(ivalue);
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const u64 expected = std::bit_cast<u64>(Common::ApproximateReciprocal(dvalue));
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const u64 actual = test.wrapped_fres(ivalue, fpscr);
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if (expected != actual)
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fmt::print("{:016x} -> {:016x} == {:016x}\n", ivalue, actual, expected);
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EXPECT_EQ(expected, actual);
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}
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}
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