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// Copyright 2025 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <bit>
#include "Common/CommonTypes.h"
#include "Common/FloatUtils.h"
#include "Common/ScopeGuard.h"
#include "Common/x64ABI.h"
#include "Core/Core.h"
#include "Core/PowerPC/Jit64/Jit.h"
#include "Core/PowerPC/Jit64Common/Jit64AsmCommon.h"
#include "Core/PowerPC/Jit64Common/Jit64PowerPCState.h"
#include "Core/System.h"
#include "../TestValues.h"
#include <gtest/gtest.h>
namespace
{
class TestFres : public CommonAsmRoutines
{
public:
explicit TestFres(Core::System& system) : CommonAsmRoutines(jit), jit(system)
{
using namespace Gen;
AllocCodeSpace(4096);
m_const_pool.Init(AllocChildCodeSpace(1024), 1024);
const auto raw_fres = reinterpret_cast<double (*)(double)>(AlignCode4());
GenFres();
wrapped_fres = reinterpret_cast<u64 (*)(u64, const UReg_FPSCR&)>(AlignCode4());
ABI_PushRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8, 16);
// We know that the only part of PowerPCState that the fres routine accesses is the fpscr.
// We manufacture a PPCSTATE pointer so it reads from our provided fpscr instead.
LEA(64, RPPCSTATE, MDisp(ABI_PARAM2, -PPCSTATE_OFF(fpscr)));
// Call
MOVQ_xmm(XMM0, R(ABI_PARAM1));
ABI_CallFunction(raw_fres);
MOVQ_xmm(R(ABI_RETURN), XMM0);
ABI_PopRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8, 16);
RET();
}
u64 (*wrapped_fres)(u64, const UReg_FPSCR&);
Jit64 jit;
};
} // namespace
TEST(Jit64, Fres)
{
Core::DeclareAsCPUThread();
Common::ScopeGuard cpu_thread_guard([] { Core::UndeclareAsCPUThread(); });
TestFres test(Core::System::GetInstance());
// FPSCR with NI set
const UReg_FPSCR fpscr = UReg_FPSCR(0x00000004);
for (const u64 ivalue : double_test_values)
{
const double dvalue = std::bit_cast<double>(ivalue);
const u64 expected = std::bit_cast<u64>(Common::ApproximateReciprocal(dvalue));
const u64 actual = test.wrapped_fres(ivalue, fpscr);
if (expected != actual)
fmt::print("{:016x} -> {:016x} == {:016x}\n", ivalue, actual, expected);
EXPECT_EQ(expected, actual);
}
}
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