dolphin/Source/UnitTests/Core/PowerPC/Jit64Common/Frsqrte.cpp

78 lines
2.0 KiB
C++

// Copyright 2018 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <cstring>
#include "Common/BitUtils.h"
#include "Common/CommonTypes.h"
#include "Common/FloatUtils.h"
#include "Common/x64ABI.h"
#include "Core/PowerPC/Gekko.h"
#include "Core/PowerPC/Jit64/Jit.h"
#include "Core/PowerPC/Jit64Common/Jit64AsmCommon.h"
#include "Core/PowerPC/Jit64Common/Jit64PowerPCState.h"
#include "../TestValues.h"
#include <fmt/format.h>
#include <gtest/gtest.h>
namespace
{
class TestCommonAsmRoutines : public CommonAsmRoutines
{
public:
TestCommonAsmRoutines() : CommonAsmRoutines(jit)
{
using namespace Gen;
AllocCodeSpace(4096);
m_const_pool.Init(AllocChildCodeSpace(1024), 1024);
const auto raw_frsqrte = reinterpret_cast<double (*)(double)>(AlignCode4());
GenFrsqrte();
wrapped_frsqrte = reinterpret_cast<u64 (*)(u64, UReg_FPSCR&)>(AlignCode4());
ABI_PushRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8, 16);
// We know the frsqrte implementation only accesses the fpscr. We manufacture a
// PPCSTATE pointer so we read/write to our provided fpscr argument instead.
XOR(32, R(RPPCSTATE), R(RPPCSTATE));
LEA(64, RSCRATCH, PPCSTATE(fpscr));
SUB(64, R(ABI_PARAM2), R(RSCRATCH));
MOV(64, R(RPPCSTATE), R(ABI_PARAM2));
// Call
MOVQ_xmm(XMM0, R(ABI_PARAM1));
ABI_CallFunction(raw_frsqrte);
MOVQ_xmm(R(ABI_RETURN), XMM0);
ABI_PopRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8, 16);
RET();
}
u64 (*wrapped_frsqrte)(u64, UReg_FPSCR&);
Jit64 jit;
};
} // namespace
TEST(Jit64, Frsqrte)
{
TestCommonAsmRoutines routines;
UReg_FPSCR fpscr;
for (const u64 ivalue : double_test_values)
{
double dvalue = Common::BitCast<double>(ivalue);
u64 expected = Common::BitCast<u64>(Common::ApproximateReciprocalSquareRoot(dvalue));
u64 actual = routines.wrapped_frsqrte(ivalue, fpscr);
fmt::print("{:016x} -> {:016x} == {:016x}\n", ivalue, actual, expected);
EXPECT_EQ(expected, actual);
}
}