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llvm-project/llvm/unittests/Transforms/Utils/CodeExtractorTest.cpp

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//===- CodeExtractor.cpp - Unit tests for CodeExtractor -------------------===//
//
// 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 "llvm/Transforms/Utils/CodeExtractor.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/Analysis/AssumptionCache.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") };
CodeExtractor CE(Candidates);
EXPECT_TRUE(CE.isEligible());
CodeExtractorAnalysisCache CEAC(*Func);
Function *Outlined = CE.extractCodeRegion(CEAC);
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")
};
CodeExtractor CE(ExtractedBlocks);
EXPECT_TRUE(CE.isEligible());
CodeExtractorAnalysisCache CEAC(*Func);
Function *Outlined = CE.extractCodeRegion(CEAC);
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));
}
TEST(CodeExtractor, StoreOutputInvokeResultAfterEHPad) {
LLVMContext Ctx;
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyString(R"invalid(
declare i8 @hoge()
define i32 @foo() personality i8* null {
entry:
%call = invoke i8 @hoge()
to label %invoke.cont unwind label %lpad
invoke.cont: ; preds = %entry
unreachable
lpad: ; preds = %entry
%0 = landingpad { i8*, i32 }
catch i8* null
br i1 undef, label %catch, label %finally.catchall
catch: ; preds = %lpad
%call2 = invoke i8 @hoge()
to label %invoke.cont2 unwind label %lpad2
invoke.cont2: ; preds = %catch
%call3 = invoke i8 @hoge()
to label %invoke.cont3 unwind label %lpad2
invoke.cont3: ; preds = %invoke.cont2
unreachable
lpad2: ; preds = %invoke.cont2, %catch
%ex.1 = phi i8* [ undef, %invoke.cont2 ], [ null, %catch ]
%1 = landingpad { i8*, i32 }
catch i8* null
br label %finally.catchall
finally.catchall: ; preds = %lpad33, %lpad
%ex.2 = phi i8* [ %ex.1, %lpad2 ], [ null, %lpad ]
unreachable
}
)invalid", Err, Ctx));
if (!M) {
Err.print("unit", errs());
exit(1);
}
Function *Func = M->getFunction("foo");
EXPECT_FALSE(verifyFunction(*Func, &errs()));
SmallVector<BasicBlock *, 2> ExtractedBlocks{
getBlockByName(Func, "catch"),
getBlockByName(Func, "invoke.cont2"),
getBlockByName(Func, "invoke.cont3"),
getBlockByName(Func, "lpad2")
};
CodeExtractor CE(ExtractedBlocks);
EXPECT_TRUE(CE.isEligible());
CodeExtractorAnalysisCache CEAC(*Func);
Function *Outlined = CE.extractCodeRegion(CEAC);
EXPECT_TRUE(Outlined);
EXPECT_FALSE(verifyFunction(*Outlined, &errs()));
EXPECT_FALSE(verifyFunction(*Func, &errs()));
}
TEST(CodeExtractor, StoreOutputInvokeResultInExitStub) {
LLVMContext Ctx;
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyString(R"invalid(
declare i32 @bar()
define i32 @foo() personality i8* null {
entry:
%0 = invoke i32 @bar() to label %exit unwind label %lpad
exit:
ret i32 %0
lpad:
%1 = landingpad { i8*, i32 }
cleanup
resume { i8*, i32 } %1
}
)invalid",
Err, Ctx));
Function *Func = M->getFunction("foo");
SmallVector<BasicBlock *, 1> Blocks{ getBlockByName(Func, "entry"),
getBlockByName(Func, "lpad") };
CodeExtractor CE(Blocks);
EXPECT_TRUE(CE.isEligible());
CodeExtractorAnalysisCache CEAC(*Func);
Function *Outlined = CE.extractCodeRegion(CEAC);
EXPECT_TRUE(Outlined);
EXPECT_FALSE(verifyFunction(*Outlined));
EXPECT_FALSE(verifyFunction(*Func));
}
TEST(CodeExtractor, ExtractAndInvalidateAssumptionCache) {
LLVMContext Ctx;
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyString(R"ir(
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64"
%b = type { i64 }
declare void @g(i8*)
declare void @llvm.assume(i1) #0
define void @test() {
entry:
br label %label
label:
%0 = load %b*, %b** inttoptr (i64 8 to %b**), align 8
%1 = getelementptr inbounds %b, %b* %0, i64 undef, i32 0
%2 = load i64, i64* %1, align 8
%3 = icmp ugt i64 %2, 1
br i1 %3, label %if.then, label %if.else
if.then:
unreachable
if.else:
call void @g(i8* undef)
store i64 undef, i64* null, align 536870912
%4 = icmp eq i64 %2, 0
call void @llvm.assume(i1 %4)
unreachable
}
attributes #0 = { nounwind willreturn }
)ir",
Err, Ctx));
assert(M && "Could not parse module?");
Function *Func = M->getFunction("test");
SmallVector<BasicBlock *, 1> Blocks{ getBlockByName(Func, "if.else") };
AssumptionCache AC(*Func);
CodeExtractor CE(Blocks, nullptr, false, nullptr, nullptr, &AC);
EXPECT_TRUE(CE.isEligible());
CodeExtractorAnalysisCache CEAC(*Func);
Function *Outlined = CE.extractCodeRegion(CEAC);
EXPECT_TRUE(Outlined);
EXPECT_FALSE(verifyFunction(*Outlined));
EXPECT_FALSE(verifyFunction(*Func));
EXPECT_FALSE(CE.verifyAssumptionCache(*Func, *Outlined, &AC));
}
} // end anonymous namespace
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