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//===- CodeExtractor.cpp - Unit tests for CodeExtractor -------------------===//
//
// 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/CodeExtractor.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
BasicBlock *getBlockByName(Function *F, StringRef name) {
for (auto &BB : *F)
if (BB.getName() == name)
return &BB;
return nullptr;
}
TEST(CodeExtractor, ExitStub) {
LLVMContext Ctx;
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyString(R"invalid(
define i32 @foo(i32 %x, i32 %y, i32 %z) {
header:
%0 = icmp ugt i32 %x, %y
br i1 %0, label %body1, label %body2
body1:
%1 = add i32 %z, 2
br label %notExtracted
body2:
%2 = mul i32 %z, 7
br label %notExtracted
notExtracted:
%3 = phi i32 [ %1, %body1 ], [ %2, %body2 ]
%4 = add i32 %3, %x
ret i32 %4
}
)invalid",
Err, Ctx));
Function *Func = M->getFunction("foo");
SmallVector<BasicBlock *, 3> Candidates{ getBlockByName(Func, "header"),
getBlockByName(Func, "body1"),
getBlockByName(Func, "body2") };
DominatorTree DT(*Func);
CodeExtractor CE(Candidates, &DT);
EXPECT_TRUE(CE.isEligible());
Function *Outlined = CE.extractCodeRegion();
EXPECT_TRUE(Outlined);
BasicBlock *Exit = getBlockByName(Func, "notExtracted");
BasicBlock *ExitSplit = getBlockByName(Outlined, "notExtracted.split");
// Ensure that PHI in exit block has only one incoming value (from code
// replacer block).
EXPECT_TRUE(Exit && cast<PHINode>(Exit->front()).getNumIncomingValues() == 1);
// Ensure that there is a PHI in outlined function with 2 incoming values.
EXPECT_TRUE(ExitSplit &&
cast<PHINode>(ExitSplit->front()).getNumIncomingValues() == 2);
EXPECT_FALSE(verifyFunction(*Outlined));
EXPECT_FALSE(verifyFunction(*Func));
}
TEST(CodeExtractor, ExitPHIOnePredFromRegion) {
LLVMContext Ctx;
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyString(R"invalid(
define i32 @foo() {
header:
br i1 undef, label %extracted1, label %pred
pred:
br i1 undef, label %exit1, label %exit2
extracted1:
br i1 undef, label %extracted2, label %exit1
extracted2:
br label %exit2
exit1:
%0 = phi i32 [ 1, %extracted1 ], [ 2, %pred ]
ret i32 %0
exit2:
%1 = phi i32 [ 3, %extracted2 ], [ 4, %pred ]
ret i32 %1
}
)invalid", Err, Ctx));
Function *Func = M->getFunction("foo");
SmallVector<BasicBlock *, 2> ExtractedBlocks{
getBlockByName(Func, "extracted1"),
getBlockByName(Func, "extracted2")
};
DominatorTree DT(*Func);
CodeExtractor CE(ExtractedBlocks, &DT);
EXPECT_TRUE(CE.isEligible());
Function *Outlined = CE.extractCodeRegion();
EXPECT_TRUE(Outlined);
BasicBlock *Exit1 = getBlockByName(Func, "exit1");
BasicBlock *Exit2 = getBlockByName(Func, "exit2");
// Ensure that PHIs in exits are not splitted (since that they have only one
// incoming value from extracted region).
EXPECT_TRUE(Exit1 &&
cast<PHINode>(Exit1->front()).getNumIncomingValues() == 2);
EXPECT_TRUE(Exit2 &&
cast<PHINode>(Exit2->front()).getNumIncomingValues() == 2);
EXPECT_FALSE(verifyFunction(*Outlined));
EXPECT_FALSE(verifyFunction(*Func));
}
} // end anonymous namespace
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