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//===-- SnippetRepetitorTest.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 "../Common/AssemblerUtils.h"
#include "LlvmState.h"
#include "MCInstrDescView.h"
#include "RegisterAliasing.h"
#include "TestBase.h"
#include "X86InstrInfo.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
namespace llvm {
namespace exegesis {
void InitializeX86ExegesisTarget();
namespace {
using testing::ElementsAre;
using testing::Eq;
using testing::Field;
using testing::Property;
using testing::UnorderedElementsAre;
class X86SnippetRepetitorTest : public X86TestBase {
protected:
void SetUp() override {
TM = State.createTargetMachine();
Context = std::make_unique<LLVMContext>();
Mod = std::make_unique<Module>("X86SnippetRepetitorTest", *Context);
Mod->setDataLayout(TM->createDataLayout());
MMI = std::make_unique<MachineModuleInfo>(TM.get());
MF = &createVoidVoidPtrMachineFunction("TestFn", Mod.get(), MMI.get());
}
void TestCommon(InstructionBenchmark::RepetitionModeE RepetitionMode) {
const auto Repetitor = SnippetRepetitor::Create(RepetitionMode, State);
const std::vector<MCInst> Instructions = {MCInstBuilder(X86::NOOP)};
FunctionFiller Sink(*MF, {X86::EAX});
const auto Fill =
Repetitor->Repeat(Instructions, kMinInstructions, kLoopBodySize);
Fill(Sink);
}
static constexpr const unsigned kMinInstructions = 3;
static constexpr const unsigned kLoopBodySize = 5;
std::unique_ptr<LLVMTargetMachine> TM;
std::unique_ptr<LLVMContext> Context;
std::unique_ptr<Module> Mod;
std::unique_ptr<MachineModuleInfo> MMI;
MachineFunction *MF = nullptr;
};
static auto HasOpcode = [](unsigned Opcode) {
return Property(&MachineInstr::getOpcode, Eq(Opcode));
};
static auto LiveReg = [](unsigned Reg) {
return Field(&MachineBasicBlock::RegisterMaskPair::PhysReg, Eq(Reg));
};
TEST_F(X86SnippetRepetitorTest, Duplicate) {
TestCommon(InstructionBenchmark::Duplicate);
// Duplicating creates a single basic block that repeats the instructions.
ASSERT_EQ(MF->getNumBlockIDs(), 1u);
EXPECT_THAT(MF->getBlockNumbered(0)->instrs(),
ElementsAre(HasOpcode(X86::NOOP), HasOpcode(X86::NOOP),
HasOpcode(X86::NOOP), HasOpcode(X86::RET64)));
}
TEST_F(X86SnippetRepetitorTest, Loop) {
TestCommon(InstructionBenchmark::Loop);
// Duplicating creates an entry block, a loop body and a ret block.
ASSERT_EQ(MF->getNumBlockIDs(), 3u);
const auto &LoopBlock = *MF->getBlockNumbered(1);
EXPECT_THAT(LoopBlock.instrs(),
ElementsAre(HasOpcode(X86::NOOP), HasOpcode(X86::NOOP),
HasOpcode(X86::NOOP), HasOpcode(X86::NOOP),
HasOpcode(X86::NOOP), HasOpcode(X86::ADD64ri8),
HasOpcode(X86::JCC_1)));
EXPECT_THAT(LoopBlock.liveins(),
UnorderedElementsAre(
LiveReg(X86::EAX),
LiveReg(State.getExegesisTarget().getLoopCounterRegister(
State.getTargetMachine().getTargetTriple()))));
EXPECT_THAT(MF->getBlockNumbered(2)->instrs(),
ElementsAre(HasOpcode(X86::RET64)));
}
} // namespace
} // namespace exegesis
} // namespace llvm
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