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//===- llvm/unittest/CodeGen/SelectionDAGAddressAnalysisTest.cpp ---------===//
//
// 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/CodeGen/SelectionDAGAddressAnalysis.h"
#include "llvm/Analysis/MemoryLocation.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Target/TargetMachine.h"
#include "gtest/gtest.h"
namespace llvm {
class SelectionDAGAddressAnalysisTest : public testing::Test {
protected:
static void SetUpTestCase() {
InitializeAllTargets();
InitializeAllTargetMCs();
}
void SetUp() override {
StringRef Assembly = "@g = global i32 0\n"
"@g_alias = alias i32, i32* @g\n"
"define i32 @f() {\n"
" %1 = load i32, i32* @g\n"
" ret i32 %1\n"
"}";
Triple TargetTriple("aarch64--");
std::string Error;
const Target *T = TargetRegistry::lookupTarget("", TargetTriple, Error);
// FIXME: These tests do not depend on AArch64 specifically, but we have to
// initialize a target. A skeleton Target for unittests would allow us to
// always run these tests.
if (!T)
GTEST_SKIP();
TargetOptions Options;
TM = std::unique_ptr<LLVMTargetMachine>(static_cast<LLVMTargetMachine *>(
T->createTargetMachine("AArch64", "", "+sve", Options, None, None,
CodeGenOpt::Aggressive)));
if (!TM)
GTEST_SKIP();
SMDiagnostic SMError;
M = parseAssemblyString(Assembly, SMError, Context);
if (!M)
report_fatal_error(SMError.getMessage());
M->setDataLayout(TM->createDataLayout());
F = M->getFunction("f");
if (!F)
report_fatal_error("F?");
G = M->getGlobalVariable("g");
if (!G)
report_fatal_error("G?");
AliasedG = M->getNamedAlias("g_alias");
if (!AliasedG)
report_fatal_error("AliasedG?");
MachineModuleInfo MMI(TM.get());
MF = std::make_unique<MachineFunction>(*F, *TM, *TM->getSubtargetImpl(*F),
0, MMI);
DAG = std::make_unique<SelectionDAG>(*TM, CodeGenOpt::None);
if (!DAG)
report_fatal_error("DAG?");
OptimizationRemarkEmitter ORE(F);
DAG->init(*MF, ORE, nullptr, nullptr, nullptr, nullptr, nullptr);
}
TargetLoweringBase::LegalizeTypeAction getTypeAction(EVT VT) {
return DAG->getTargetLoweringInfo().getTypeAction(Context, VT);
}
EVT getTypeToTransformTo(EVT VT) {
return DAG->getTargetLoweringInfo().getTypeToTransformTo(Context, VT);
}
LLVMContext Context;
std::unique_ptr<LLVMTargetMachine> TM;
std::unique_ptr<Module> M;
Function *F;
GlobalVariable *G;
GlobalAlias *AliasedG;
std::unique_ptr<MachineFunction> MF;
std::unique_ptr<SelectionDAG> DAG;
};
TEST_F(SelectionDAGAddressAnalysisTest, sameFrameObject) {
SDLoc Loc;
auto Int8VT = EVT::getIntegerVT(Context, 8);
auto VecVT = EVT::getVectorVT(Context, Int8VT, 4);
SDValue FIPtr = DAG->CreateStackTemporary(VecVT);
int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(*MF, FI);
TypeSize Offset = TypeSize::Fixed(0);
SDValue Value = DAG->getConstant(0, Loc, VecVT);
SDValue Index = DAG->getMemBasePlusOffset(FIPtr, Offset, Loc);
SDValue Store = DAG->getStore(DAG->getEntryNode(), Loc, Value, Index,
PtrInfo.getWithOffset(Offset));
Optional<int64_t> NumBytes = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store)->getMemoryVT().getStoreSize());
bool IsAlias;
bool IsValid = BaseIndexOffset::computeAliasing(
Store.getNode(), NumBytes, Store.getNode(), NumBytes, *DAG, IsAlias);
EXPECT_TRUE(IsValid);
EXPECT_TRUE(IsAlias);
}
TEST_F(SelectionDAGAddressAnalysisTest, sameFrameObjectUnknownSize) {
SDLoc Loc;
auto Int8VT = EVT::getIntegerVT(Context, 8);
auto VecVT = EVT::getVectorVT(Context, Int8VT, 4);
SDValue FIPtr = DAG->CreateStackTemporary(VecVT);
int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(*MF, FI);
TypeSize Offset = TypeSize::Fixed(0);
SDValue Value = DAG->getConstant(0, Loc, VecVT);
SDValue Index = DAG->getMemBasePlusOffset(FIPtr, Offset, Loc);
SDValue Store = DAG->getStore(DAG->getEntryNode(), Loc, Value, Index,
PtrInfo.getWithOffset(Offset));
// Maybe unlikely that BaseIndexOffset::computeAliasing is used with the
// optional NumBytes being unset like in this test, but it would be confusing
// if that function determined IsAlias=false here.
Optional<int64_t> NumBytes;
bool IsAlias;
bool IsValid = BaseIndexOffset::computeAliasing(
Store.getNode(), NumBytes, Store.getNode(), NumBytes, *DAG, IsAlias);
EXPECT_FALSE(IsValid);
}
TEST_F(SelectionDAGAddressAnalysisTest, noAliasingFrameObjects) {
SDLoc Loc;
auto Int8VT = EVT::getIntegerVT(Context, 8);
// <4 x i8>
auto VecVT = EVT::getVectorVT(Context, Int8VT, 4);
// <2 x i8>
auto SubVecVT = EVT::getVectorVT(Context, Int8VT, 2);
SDValue FIPtr = DAG->CreateStackTemporary(VecVT);
int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(*MF, FI);
SDValue Value = DAG->getConstant(0, Loc, SubVecVT);
TypeSize Offset0 = TypeSize::Fixed(0);
TypeSize Offset1 = SubVecVT.getStoreSize();
SDValue Index0 = DAG->getMemBasePlusOffset(FIPtr, Offset0, Loc);
SDValue Index1 = DAG->getMemBasePlusOffset(FIPtr, Offset1, Loc);
SDValue Store0 = DAG->getStore(DAG->getEntryNode(), Loc, Value, Index0,
PtrInfo.getWithOffset(Offset0));
SDValue Store1 = DAG->getStore(DAG->getEntryNode(), Loc, Value, Index1,
PtrInfo.getWithOffset(Offset1));
Optional<int64_t> NumBytes0 = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store0)->getMemoryVT().getStoreSize());
Optional<int64_t> NumBytes1 = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store1)->getMemoryVT().getStoreSize());
bool IsAlias;
bool IsValid = BaseIndexOffset::computeAliasing(
Store0.getNode(), NumBytes0, Store1.getNode(), NumBytes1, *DAG, IsAlias);
EXPECT_TRUE(IsValid);
EXPECT_FALSE(IsAlias);
}
TEST_F(SelectionDAGAddressAnalysisTest, unknownSizeFrameObjects) {
SDLoc Loc;
auto Int8VT = EVT::getIntegerVT(Context, 8);
// <vscale x 4 x i8>
auto VecVT = EVT::getVectorVT(Context, Int8VT, 4, true);
// <vscale x 2 x i8>
auto SubVecVT = EVT::getVectorVT(Context, Int8VT, 2, true);
SDValue FIPtr = DAG->CreateStackTemporary(VecVT);
int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(*MF, FI);
SDValue Value = DAG->getConstant(0, Loc, SubVecVT);
TypeSize Offset1 = SubVecVT.getStoreSize();
SDValue Index1 = DAG->getMemBasePlusOffset(FIPtr, Offset1, Loc);
SDValue Store0 =
DAG->getStore(DAG->getEntryNode(), Loc, Value, FIPtr, PtrInfo);
SDValue Store1 = DAG->getStore(DAG->getEntryNode(), Loc, Value, Index1,
MachinePointerInfo(PtrInfo.getAddrSpace()));
Optional<int64_t> NumBytes0 = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store0)->getMemoryVT().getStoreSize());
Optional<int64_t> NumBytes1 = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store1)->getMemoryVT().getStoreSize());
bool IsAlias;
bool IsValid = BaseIndexOffset::computeAliasing(
Store0.getNode(), NumBytes0, Store1.getNode(), NumBytes1, *DAG, IsAlias);
EXPECT_FALSE(IsValid);
}
TEST_F(SelectionDAGAddressAnalysisTest, globalWithFrameObject) {
SDLoc Loc;
auto Int8VT = EVT::getIntegerVT(Context, 8);
// <vscale x 4 x i8>
auto VecVT = EVT::getVectorVT(Context, Int8VT, 4, true);
SDValue FIPtr = DAG->CreateStackTemporary(VecVT);
int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(*MF, FI);
SDValue Value = DAG->getConstant(0, Loc, VecVT);
TypeSize Offset = TypeSize::Fixed(0);
SDValue Index = DAG->getMemBasePlusOffset(FIPtr, Offset, Loc);
SDValue Store = DAG->getStore(DAG->getEntryNode(), Loc, Value, Index,
PtrInfo.getWithOffset(Offset));
Optional<int64_t> NumBytes = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store)->getMemoryVT().getStoreSize());
EVT GTy = DAG->getTargetLoweringInfo().getValueType(DAG->getDataLayout(),
G->getType());
SDValue GValue = DAG->getConstant(0, Loc, GTy);
SDValue GAddr = DAG->getGlobalAddress(G, Loc, GTy);
SDValue GStore = DAG->getStore(DAG->getEntryNode(), Loc, GValue, GAddr,
MachinePointerInfo(G, 0));
Optional<int64_t> GNumBytes = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(GStore)->getMemoryVT().getStoreSize());
bool IsAlias;
bool IsValid = BaseIndexOffset::computeAliasing(
Store.getNode(), NumBytes, GStore.getNode(), GNumBytes, *DAG, IsAlias);
EXPECT_TRUE(IsValid);
EXPECT_FALSE(IsAlias);
}
TEST_F(SelectionDAGAddressAnalysisTest, globalWithAliasedGlobal) {
SDLoc Loc;
EVT GTy = DAG->getTargetLoweringInfo().getValueType(DAG->getDataLayout(),
G->getType());
SDValue GValue = DAG->getConstant(0, Loc, GTy);
SDValue GAddr = DAG->getGlobalAddress(G, Loc, GTy);
SDValue GStore = DAG->getStore(DAG->getEntryNode(), Loc, GValue, GAddr,
MachinePointerInfo(G, 0));
Optional<int64_t> GNumBytes = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(GStore)->getMemoryVT().getStoreSize());
SDValue AliasedGValue = DAG->getConstant(1, Loc, GTy);
SDValue AliasedGAddr = DAG->getGlobalAddress(AliasedG, Loc, GTy);
SDValue AliasedGStore =
DAG->getStore(DAG->getEntryNode(), Loc, AliasedGValue, AliasedGAddr,
MachinePointerInfo(AliasedG, 0));
bool IsAlias;
bool IsValid = BaseIndexOffset::computeAliasing(GStore.getNode(), GNumBytes,
AliasedGStore.getNode(),
GNumBytes, *DAG, IsAlias);
// With some deeper analysis we could detect if G and AliasedG is aliasing or
// not. But computeAliasing is currently defensive and assumes that a
// GlobalAlias might alias with any global variable.
EXPECT_FALSE(IsValid);
}
TEST_F(SelectionDAGAddressAnalysisTest, fixedSizeFrameObjectsWithinDiff) {
SDLoc Loc;
auto Int8VT = EVT::getIntegerVT(Context, 8);
// <vscale x 4 x i8>
auto VecVT = EVT::getVectorVT(Context, Int8VT, 4, true);
// <vscale x 2 x i8>
auto SubVecVT = EVT::getVectorVT(Context, Int8VT, 2, true);
// <2 x i8>
auto SubFixedVecVT2xi8 = EVT::getVectorVT(Context, Int8VT, 2);
SDValue FIPtr = DAG->CreateStackTemporary(VecVT);
int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(*MF, FI);
SDValue Value0 = DAG->getConstant(0, Loc, SubFixedVecVT2xi8);
SDValue Value1 = DAG->getConstant(0, Loc, SubVecVT);
TypeSize Offset0 = TypeSize::Fixed(0);
TypeSize Offset1 = SubFixedVecVT2xi8.getStoreSize();
SDValue Index0 = DAG->getMemBasePlusOffset(FIPtr, Offset0, Loc);
SDValue Index1 = DAG->getMemBasePlusOffset(FIPtr, Offset1, Loc);
SDValue Store0 = DAG->getStore(DAG->getEntryNode(), Loc, Value0, Index0,
PtrInfo.getWithOffset(Offset0));
SDValue Store1 = DAG->getStore(DAG->getEntryNode(), Loc, Value1, Index1,
PtrInfo.getWithOffset(Offset1));
Optional<int64_t> NumBytes0 = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store0)->getMemoryVT().getStoreSize());
Optional<int64_t> NumBytes1 = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store1)->getMemoryVT().getStoreSize());
bool IsAlias;
bool IsValid = BaseIndexOffset::computeAliasing(
Store0.getNode(), NumBytes0, Store1.getNode(), NumBytes1, *DAG, IsAlias);
EXPECT_TRUE(IsValid);
EXPECT_FALSE(IsAlias);
IsValid = BaseIndexOffset::computeAliasing(
Store1.getNode(), NumBytes1, Store0.getNode(), NumBytes0, *DAG, IsAlias);
EXPECT_TRUE(IsValid);
EXPECT_FALSE(IsAlias);
}
TEST_F(SelectionDAGAddressAnalysisTest, fixedSizeFrameObjectsOutOfDiff) {
SDLoc Loc;
auto Int8VT = EVT::getIntegerVT(Context, 8);
// <vscale x 4 x i8>
auto VecVT = EVT::getVectorVT(Context, Int8VT, 4, true);
// <vscale x 2 x i8>
auto SubVecVT = EVT::getVectorVT(Context, Int8VT, 2, true);
// <2 x i8>
auto SubFixedVecVT2xi8 = EVT::getVectorVT(Context, Int8VT, 2);
// <4 x i8>
auto SubFixedVecVT4xi8 = EVT::getVectorVT(Context, Int8VT, 4);
SDValue FIPtr = DAG->CreateStackTemporary(VecVT);
int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(*MF, FI);
SDValue Value0 = DAG->getConstant(0, Loc, SubFixedVecVT4xi8);
SDValue Value1 = DAG->getConstant(0, Loc, SubVecVT);
TypeSize Offset0 = TypeSize::Fixed(0);
TypeSize Offset1 = SubFixedVecVT2xi8.getStoreSize();
SDValue Index0 = DAG->getMemBasePlusOffset(FIPtr, Offset0, Loc);
SDValue Index1 = DAG->getMemBasePlusOffset(FIPtr, Offset1, Loc);
SDValue Store0 = DAG->getStore(DAG->getEntryNode(), Loc, Value0, Index0,
PtrInfo.getWithOffset(Offset0));
SDValue Store1 = DAG->getStore(DAG->getEntryNode(), Loc, Value1, Index1,
PtrInfo.getWithOffset(Offset1));
Optional<int64_t> NumBytes0 = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store0)->getMemoryVT().getStoreSize());
Optional<int64_t> NumBytes1 = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store1)->getMemoryVT().getStoreSize());
bool IsAlias;
bool IsValid = BaseIndexOffset::computeAliasing(
Store0.getNode(), NumBytes0, Store1.getNode(), NumBytes1, *DAG, IsAlias);
EXPECT_TRUE(IsValid);
EXPECT_TRUE(IsAlias);
}
TEST_F(SelectionDAGAddressAnalysisTest, twoFixedStackObjects) {
SDLoc Loc;
auto Int8VT = EVT::getIntegerVT(Context, 8);
// <vscale x 2 x i8>
auto VecVT = EVT::getVectorVT(Context, Int8VT, 2, true);
// <2 x i8>
auto FixedVecVT = EVT::getVectorVT(Context, Int8VT, 2);
SDValue FIPtr0 = DAG->CreateStackTemporary(FixedVecVT);
SDValue FIPtr1 = DAG->CreateStackTemporary(VecVT);
int FI0 = cast<FrameIndexSDNode>(FIPtr0.getNode())->getIndex();
int FI1 = cast<FrameIndexSDNode>(FIPtr1.getNode())->getIndex();
MachinePointerInfo PtrInfo0 = MachinePointerInfo::getFixedStack(*MF, FI0);
MachinePointerInfo PtrInfo1 = MachinePointerInfo::getFixedStack(*MF, FI1);
SDValue Value0 = DAG->getConstant(0, Loc, FixedVecVT);
SDValue Value1 = DAG->getConstant(0, Loc, VecVT);
TypeSize Offset0 = TypeSize::Fixed(0);
SDValue Index0 = DAG->getMemBasePlusOffset(FIPtr0, Offset0, Loc);
SDValue Index1 = DAG->getMemBasePlusOffset(FIPtr1, Offset0, Loc);
SDValue Store0 = DAG->getStore(DAG->getEntryNode(), Loc, Value0, Index0,
PtrInfo0.getWithOffset(Offset0));
SDValue Store1 = DAG->getStore(DAG->getEntryNode(), Loc, Value1, Index1,
PtrInfo1.getWithOffset(Offset0));
Optional<int64_t> NumBytes0 = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store0)->getMemoryVT().getStoreSize());
Optional<int64_t> NumBytes1 = MemoryLocation::getSizeOrUnknown(
cast<StoreSDNode>(Store1)->getMemoryVT().getStoreSize());
bool IsAlias;
bool IsValid = BaseIndexOffset::computeAliasing(
Store0.getNode(), NumBytes0, Store1.getNode(), NumBytes1, *DAG, IsAlias);
EXPECT_TRUE(IsValid);
EXPECT_FALSE(IsAlias);
}
} // end namespace llvm
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