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//===- OrderedInstructions.cpp - Unit tests for OrderedInstructions ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/OrderedInstructions.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "gtest/gtest.h"
using namespace llvm;
/// Check intra-basicblock and inter-basicblock dominance using
/// OrderedInstruction.
TEST(OrderedInstructionsTest, DominanceTest) {
LLVMContext Ctx;
Module M("test", Ctx);
IRBuilder<> B(Ctx);
FunctionType *FTy =
FunctionType::get(Type::getVoidTy(Ctx), {B.getInt8PtrTy()}, false);
Function *F = cast<Function>(M.getOrInsertFunction("f", FTy));
// Create the function as follow and check for dominance relation.
//
// test():
// bbx:
// loadx;
// loady;
// bby:
// loadz;
// return;
//
// More specifically, check for loadx -> (dominates) loady,
// loady -> loadx and loady -> loadz.
//
// Create BBX with 2 loads.
BasicBlock *BBX = BasicBlock::Create(Ctx, "bbx", F);
B.SetInsertPoint(BBX);
Argument *PointerArg = &*F->arg_begin();
LoadInst *LoadInstX = B.CreateLoad(PointerArg);
LoadInst *LoadInstY = B.CreateLoad(PointerArg);
// Create BBY with 1 load.
BasicBlock *BBY = BasicBlock::Create(Ctx, "bby", F);
B.SetInsertPoint(BBY);
LoadInst *LoadInstZ = B.CreateLoad(PointerArg);
B.CreateRet(LoadInstZ);
std::unique_ptr<DominatorTree> DT(new DominatorTree(*F));
OrderedInstructions OI(&*DT);
// Intra-BB dominance test.
EXPECT_TRUE(OI.dominates(LoadInstX, LoadInstY));
EXPECT_FALSE(OI.dominates(LoadInstY, LoadInstX));
// Inter-BB dominance test.
EXPECT_TRUE(OI.dominates(LoadInstY, LoadInstZ));
}
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