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//===-- X86RegisterAliasingTest.cpp --------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "RegisterAliasing.h"
#include <cassert>
#include <memory>
#include "TestBase.h"
#include "X86InstrInfo.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
namespace llvm {
namespace exegesis {
namespace {
class X86RegisterAliasingTest : public X86TestBase {};
TEST_F(X86RegisterAliasingTest, TrackSimpleRegister) {
const auto &RegInfo = State.getRegInfo();
const RegisterAliasingTracker tracker(RegInfo, X86::EAX);
std::set<MCPhysReg> ActualAliasedRegisters;
for (unsigned I : tracker.aliasedBits().set_bits())
ActualAliasedRegisters.insert(static_cast<MCPhysReg>(I));
const std::set<MCPhysReg> ExpectedAliasedRegisters = {
X86::AL, X86::AH, X86::AX, X86::EAX, X86::HAX, X86::RAX};
ASSERT_THAT(ActualAliasedRegisters, ExpectedAliasedRegisters);
for (MCPhysReg aliased : ExpectedAliasedRegisters) {
ASSERT_THAT(tracker.getOrigin(aliased), X86::EAX);
}
}
TEST_F(X86RegisterAliasingTest, TrackRegisterClass) {
// The alias bits for GR8_ABCD_LRegClassID are the union of the alias bits for
// AL, BL, CL and DL.
const auto &RegInfo = State.getRegInfo();
const BitVector NoReservedReg(RegInfo.getNumRegs());
const RegisterAliasingTracker RegClassTracker(
RegInfo, NoReservedReg, RegInfo.getRegClass(X86::GR8_ABCD_LRegClassID));
BitVector sum(RegInfo.getNumRegs());
sum |= RegisterAliasingTracker(RegInfo, X86::AL).aliasedBits();
sum |= RegisterAliasingTracker(RegInfo, X86::BL).aliasedBits();
sum |= RegisterAliasingTracker(RegInfo, X86::CL).aliasedBits();
sum |= RegisterAliasingTracker(RegInfo, X86::DL).aliasedBits();
ASSERT_THAT(RegClassTracker.aliasedBits(), sum);
}
TEST_F(X86RegisterAliasingTest, TrackRegisterClassCache) {
// Fetching twice the same tracker yields the same pointers.
const auto &RegInfo = State.getRegInfo();
const BitVector NoReservedReg(RegInfo.getNumRegs());
RegisterAliasingTrackerCache Cache(RegInfo, NoReservedReg);
ASSERT_THAT(&Cache.getRegister(X86::AX), &Cache.getRegister(X86::AX));
ASSERT_THAT(&Cache.getRegisterClass(X86::GR8_ABCD_LRegClassID),
&Cache.getRegisterClass(X86::GR8_ABCD_LRegClassID));
}
} // namespace
} // namespace exegesis
} // namespace llvm
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