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// Copyright 2021 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <bit>
#include <functional>
#include "Common/Arm64Emitter.h"
#include "Common/CommonTypes.h"
#include "Common/FloatUtils.h"
#include "Common/ScopeGuard.h"
#include "Core/Core.h"
#include "Core/PowerPC/Interpreter/Interpreter_FPUtils.h"
#include "Core/PowerPC/JitArm64/Jit.h"
#include "Core/PowerPC/PowerPC.h"
#include "Core/System.h"
#include "../TestValues.h"
#include <gtest/gtest.h>
namespace
{
using namespace Arm64Gen;
class TestFrsqrte : public JitArm64
{
public:
explicit TestFrsqrte(Core::System& system) : JitArm64(system)
{
const Common::ScopedJITPageWriteAndNoExecute enable_jit_page_writes;
AllocCodeSpace(4096);
const u8* raw_frsqrte = GetCodePtr();
GenerateFrsqrte();
frsqrte = std::bit_cast<u64 (*)(u64)>(GetCodePtr());
MOV(ARM64Reg::X15, ARM64Reg::X30);
MOV(ARM64Reg::X14, PPC_REG);
MOVP2R(PPC_REG, &system.GetPPCState());
MOV(ARM64Reg::X1, ARM64Reg::X0);
m_float_emit.FMOV(ARM64Reg::D0, ARM64Reg::X0);
m_float_emit.FRSQRTE(ARM64Reg::D0, ARM64Reg::D0);
BL(raw_frsqrte);
MOV(ARM64Reg::X30, ARM64Reg::X15);
MOV(PPC_REG, ARM64Reg::X14);
RET();
}
std::function<u64(u64)> frsqrte;
};
} // namespace
TEST(JitArm64, Frsqrte)
{
Core::DeclareAsCPUThread();
Common::ScopeGuard cpu_thread_guard([] { Core::UndeclareAsCPUThread(); });
const TestFrsqrte test(Core::System::GetInstance());
for (const u64 ivalue : double_test_values)
{
const double dvalue = std::bit_cast<double>(ivalue);
const u64 expected = std::bit_cast<u64>(Common::ApproximateReciprocalSquareRoot(dvalue));
const u64 actual = test.frsqrte(ivalue);
if (expected != actual)
fmt::print("{:016x} -> {:016x} == {:016x}\n", ivalue, actual, expected);
EXPECT_EQ(expected, actual);
}
}
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