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Revert rL291205 because it breaks Chrome tests under CFI. 

Summary:
Revert LowerTypeTests: Split the pass in two: a resolution phase and a lowering phase.

This change separates how type identifiers are resolved from how intrinsic
calls are lowered. All information required to lower an intrinsic call
is stored in a new TypeIdLowering data structure. The idea is that this
data structure can either be initialized using the module itself during
regular LTO, or using the module summary in ThinLTO backends.

Original URL: https://reviews.llvm.org/D28341

Reviewers: pcc

Subscribers: mehdi_amini, llvm-commits

Differential Revision: https://reviews.llvm.org/D28532

llvm-svn: 291684
This commit is contained in:
Ivan Krasin 2017-01-11 16:54:04 +00:00
parent 9a1b202136
commit 42e6b4fd98
9 changed files with 125 additions and 163 deletions
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4
llvm/include/llvm/Transforms/IPO/LowerTypeTests.h
View File

@ -60,6 +60,10 @@ struct BitSetInfo {
bool containsGlobalOffset(uint64_t Offset) const;
bool containsValue(const DataLayout &DL,
const DenseMap<GlobalObject *, uint64_t> &GlobalLayout,
Value *V, uint64_t COffset = 0) const;
void print(raw_ostream &OS) const;
};

263
llvm/lib/Transforms/IPO/LowerTypeTests.cpp
View File

@ -91,6 +91,38 @@ bool BitSetInfo::containsGlobalOffset(uint64_t Offset) const {
return Bits.count(BitOffset);
}
bool BitSetInfo::containsValue(
const DataLayout &DL,
const DenseMap<GlobalObject *, uint64_t> &GlobalLayout, Value *V,
uint64_t COffset) const {
if (auto GV = dyn_cast<GlobalObject>(V)) {
auto I = GlobalLayout.find(GV);
if (I == GlobalLayout.end())
return false;
return containsGlobalOffset(I->second + COffset);
}
if (auto GEP = dyn_cast<GEPOperator>(V)) {
APInt APOffset(DL.getPointerSizeInBits(0), 0);
bool Result = GEP->accumulateConstantOffset(DL, APOffset);
if (!Result)
return false;
COffset += APOffset.getZExtValue();
return containsValue(DL, GlobalLayout, GEP->getPointerOperand(), COffset);
}
if (auto Op = dyn_cast<Operator>(V)) {
if (Op->getOpcode() == Instruction::BitCast)
return containsValue(DL, GlobalLayout, Op->getOperand(0), COffset);
if (Op->getOpcode() == Instruction::Select)
return containsValue(DL, GlobalLayout, Op->getOperand(1), COffset) &&
containsValue(DL, GlobalLayout, Op->getOperand(2), COffset);
}
return false;
}
void BitSetInfo::print(raw_ostream &OS) const {
OS << "offset " << ByteOffset << " size " << BitSize << " align "
<< (1 << AlignLog2);
@ -197,7 +229,7 @@ struct ByteArrayInfo {
std::set<uint64_t> Bits;
uint64_t BitSize;
GlobalVariable *ByteArray;
GlobalVariable *MaskGlobal;
Constant *Mask;
};
/// A POD-like structure that we use to store a global reference together with
@ -244,7 +276,6 @@ class LowerTypeTestsModule {
IntegerType *Int1Ty = Type::getInt1Ty(M.getContext());
IntegerType *Int8Ty = Type::getInt8Ty(M.getContext());
PointerType *Int8PtrTy = Type::getInt8PtrTy(M.getContext());
IntegerType *Int32Ty = Type::getInt32Ty(M.getContext());
PointerType *Int32PtrTy = PointerType::getUnqual(Int32Ty);
IntegerType *Int64Ty = Type::getInt64Ty(M.getContext());
@ -256,37 +287,6 @@ class LowerTypeTestsModule {
// Mapping from type identifiers to the call sites that test them.
DenseMap<Metadata *, std::vector<CallInst *>> TypeTestCallSites;
/// This structure describes how to lower type tests for a particular type
/// identifier. It is either built directly from the global analysis (during
/// regular LTO or the regular LTO phase of ThinLTO), or indirectly using type
/// identifier summaries and external symbol references (in ThinLTO backends).
struct TypeIdLowering {
TypeTestResolution::Kind TheKind;
/// All except Unsat: the start address within the combined global.
Constant *OffsetedGlobal;
/// ByteArray, Inline, AllOnes: log2 of the required global alignment
/// relative to the start address.
Constant *AlignLog2;
/// ByteArray, Inline, AllOnes: size of the memory region covering members
/// of this type identifier as a multiple of 2^AlignLog2.
Constant *Size;
/// ByteArray, Inline, AllOnes: range of the size expressed as a bit width.
unsigned SizeBitWidth;
/// ByteArray: the byte array to test the address against.
Constant *TheByteArray;
/// ByteArray: the bit mask to apply to bytes loaded from the byte array.
Constant *BitMask;
/// Inline: the bit mask to test the address against.
Constant *InlineBits;
};
std::vector<ByteArrayInfo> ByteArrayInfos;
Function *WeakInitializerFn = nullptr;
@ -296,13 +296,15 @@ class LowerTypeTestsModule {
const DenseMap<GlobalTypeMember *, uint64_t> &GlobalLayout);
ByteArrayInfo *createByteArray(BitSetInfo &BSI);
void allocateByteArrays();
Value *createBitSetTest(IRBuilder<> &B, const TypeIdLowering &TIL,
Value *createBitSetTest(IRBuilder<> &B, BitSetInfo &BSI, ByteArrayInfo *&BAI,
Value *BitOffset);
void lowerTypeTestCalls(
ArrayRef<Metadata *> TypeIds, Constant *CombinedGlobalAddr,
const DenseMap<GlobalTypeMember *, uint64_t> &GlobalLayout);
Value *lowerTypeTestCall(Metadata *TypeId, CallInst *CI,
const TypeIdLowering &TIL);
Value *
lowerBitSetCall(CallInst *CI, BitSetInfo &BSI, ByteArrayInfo *&BAI,
Constant *CombinedGlobal,
const DenseMap<GlobalObject *, uint64_t> &GlobalLayout);
void buildBitSetsFromGlobalVariables(ArrayRef<Metadata *> TypeIds,
ArrayRef<GlobalTypeMember *> Globals);
unsigned getJumpTableEntrySize();
@ -427,7 +429,7 @@ ByteArrayInfo *LowerTypeTestsModule::createByteArray(BitSetInfo &BSI) {
BAI->Bits = BSI.Bits;
BAI->BitSize = BSI.BitSize;
BAI->ByteArray = ByteArrayGlobal;
BAI->MaskGlobal = MaskGlobal;
BAI->Mask = ConstantExpr::getPtrToInt(MaskGlobal, Int8Ty);
return BAI;
}
@ -446,9 +448,8 @@ void LowerTypeTestsModule::allocateByteArrays() {
uint8_t Mask;
BAB.allocate(BAI->Bits, BAI->BitSize, ByteArrayOffsets[I], Mask);
BAI->MaskGlobal->replaceAllUsesWith(
ConstantExpr::getIntToPtr(ConstantInt::get(Int8Ty, Mask), Int8PtrTy));
BAI->MaskGlobal->eraseFromParent();
BAI->Mask->replaceAllUsesWith(ConstantInt::get(Int8Ty, Mask));
cast<GlobalVariable>(BAI->Mask->getOperand(0))->eraseFromParent();
}
Constant *ByteArrayConst = ConstantDataArray::get(M.getContext(), BAB.Bytes);
@ -483,121 +484,101 @@ void LowerTypeTestsModule::allocateByteArrays() {
ByteArraySizeBytes = BAB.Bytes.size();
}
/// Build a test that bit BitOffset is set in the type identifier that was
/// lowered to TIL, which must be either an Inline or a ByteArray.
Value *LowerTypeTestsModule::createBitSetTest(IRBuilder<> &B,
const TypeIdLowering &TIL,
/// Build a test that bit BitOffset is set in BSI, where
/// BitSetGlobal is a global containing the bits in BSI.
Value *LowerTypeTestsModule::createBitSetTest(IRBuilder<> &B, BitSetInfo &BSI,
ByteArrayInfo *&BAI,
Value *BitOffset) {
if (TIL.TheKind == TypeTestResolution::Inline) {
if (BSI.BitSize <= 64) {
// If the bit set is sufficiently small, we can avoid a load by bit testing
// a constant.
return createMaskedBitTest(B, TIL.InlineBits, BitOffset);
IntegerType *BitsTy;
if (BSI.BitSize <= 32)
BitsTy = Int32Ty;
else
BitsTy = Int64Ty;
uint64_t Bits = 0;
for (auto Bit : BSI.Bits)
Bits |= uint64_t(1) << Bit;
Constant *BitsConst = ConstantInt::get(BitsTy, Bits);
return createMaskedBitTest(B, BitsConst, BitOffset);
} else {
Constant *ByteArray = TIL.TheByteArray;
if (!BAI) {
++NumByteArraysCreated;
BAI = createByteArray(BSI);
}
Constant *ByteArray = BAI->ByteArray;
Type *Ty = BAI->ByteArray->getValueType();
if (!LinkerSubsectionsViaSymbols && AvoidReuse) {
// Each use of the byte array uses a different alias. This makes the
// backend less likely to reuse previously computed byte array addresses,
// improving the security of the CFI mechanism based on this pass.
ByteArray = GlobalAlias::create(Int8Ty, 0, GlobalValue::PrivateLinkage,
"bits_use", ByteArray, &M);
ByteArray = GlobalAlias::create(BAI->ByteArray->getValueType(), 0,
GlobalValue::PrivateLinkage, "bits_use",
ByteArray, &M);
}
Value *ByteAddr = B.CreateGEP(Int8Ty, ByteArray, BitOffset);
Value *ByteAddr = B.CreateGEP(Ty, ByteArray, BitOffset);
Value *Byte = B.CreateLoad(ByteAddr);
Value *ByteAndMask =
B.CreateAnd(Byte, ConstantExpr::getPtrToInt(TIL.BitMask, Int8Ty));
Value *ByteAndMask = B.CreateAnd(Byte, BAI->Mask);
return B.CreateICmpNE(ByteAndMask, ConstantInt::get(Int8Ty, 0));
}
}
static bool isKnownTypeIdMember(Metadata *TypeId, const DataLayout &DL,
Value *V, uint64_t COffset) {
if (auto GV = dyn_cast<GlobalObject>(V)) {
SmallVector<MDNode *, 2> Types;
GV->getMetadata(LLVMContext::MD_type, Types);
for (MDNode *Type : Types) {
if (Type->getOperand(1) != TypeId)
continue;
uint64_t Offset =
cast<ConstantInt>(
cast<ConstantAsMetadata>(Type->getOperand(0))->getValue())
->getZExtValue();
if (COffset == Offset)
return true;
}
return false;
}
if (auto GEP = dyn_cast<GEPOperator>(V)) {
APInt APOffset(DL.getPointerSizeInBits(0), 0);
bool Result = GEP->accumulateConstantOffset(DL, APOffset);
if (!Result)
return false;
COffset += APOffset.getZExtValue();
return isKnownTypeIdMember(TypeId, DL, GEP->getPointerOperand(), COffset);
}
if (auto Op = dyn_cast<Operator>(V)) {
if (Op->getOpcode() == Instruction::BitCast)
return isKnownTypeIdMember(TypeId, DL, Op->getOperand(0), COffset);
if (Op->getOpcode() == Instruction::Select)
return isKnownTypeIdMember(TypeId, DL, Op->getOperand(1), COffset) &&
isKnownTypeIdMember(TypeId, DL, Op->getOperand(2), COffset);
}
return false;
}
/// Lower a llvm.type.test call to its implementation. Returns the value to
/// replace the call with.
Value *LowerTypeTestsModule::lowerTypeTestCall(Metadata *TypeId, CallInst *CI,
const TypeIdLowering &TIL) {
if (TIL.TheKind == TypeTestResolution::Unsat)
return ConstantInt::getFalse(M.getContext());
Value *LowerTypeTestsModule::lowerBitSetCall(
CallInst *CI, BitSetInfo &BSI, ByteArrayInfo *&BAI,
Constant *CombinedGlobalIntAddr,
const DenseMap<GlobalObject *, uint64_t> &GlobalLayout) {
Value *Ptr = CI->getArgOperand(0);
const DataLayout &DL = M.getDataLayout();
if (isKnownTypeIdMember(TypeId, DL, Ptr, 0))
if (BSI.containsValue(DL, GlobalLayout, Ptr))
return ConstantInt::getTrue(M.getContext());
Constant *OffsetedGlobalAsInt = ConstantExpr::getAdd(
CombinedGlobalIntAddr, ConstantInt::get(IntPtrTy, BSI.ByteOffset));
BasicBlock *InitialBB = CI->getParent();
IRBuilder<> B(CI);
Value *PtrAsInt = B.CreatePtrToInt(Ptr, IntPtrTy);
Constant *OffsetedGlobalAsInt =
ConstantExpr::getPtrToInt(TIL.OffsetedGlobal, IntPtrTy);
if (TIL.TheKind == TypeTestResolution::Single)
if (BSI.isSingleOffset())
return B.CreateICmpEQ(PtrAsInt, OffsetedGlobalAsInt);
Value *PtrOffset = B.CreateSub(PtrAsInt, OffsetedGlobalAsInt);
// We need to check that the offset both falls within our range and is
// suitably aligned. We can check both properties at the same time by
// performing a right rotate by log2(alignment) followed by an integer
// comparison against the bitset size. The rotate will move the lower
// order bits that need to be zero into the higher order bits of the
// result, causing the comparison to fail if they are nonzero. The rotate
// also conveniently gives us a bit offset to use during the load from
// the bitset.
Value *OffsetSHR =
B.CreateLShr(PtrOffset, ConstantExpr::getZExt(TIL.AlignLog2, IntPtrTy));
Value *OffsetSHL = B.CreateShl(
PtrOffset, ConstantExpr::getZExt(
ConstantExpr::getSub(
ConstantInt::get(Int8Ty, DL.getPointerSizeInBits(0)),
TIL.AlignLog2),
IntPtrTy));
Value *BitOffset = B.CreateOr(OffsetSHR, OffsetSHL);
Value *BitOffset;
if (BSI.AlignLog2 == 0) {
BitOffset = PtrOffset;
} else {
// We need to check that the offset both falls within our range and is
// suitably aligned. We can check both properties at the same time by
// performing a right rotate by log2(alignment) followed by an integer
// comparison against the bitset size. The rotate will move the lower
// order bits that need to be zero into the higher order bits of the
// result, causing the comparison to fail if they are nonzero. The rotate
// also conveniently gives us a bit offset to use during the load from
// the bitset.
Value *OffsetSHR =
B.CreateLShr(PtrOffset, ConstantInt::get(IntPtrTy, BSI.AlignLog2));
Value *OffsetSHL = B.CreateShl(
PtrOffset,
ConstantInt::get(IntPtrTy, DL.getPointerSizeInBits(0) - BSI.AlignLog2));
BitOffset = B.CreateOr(OffsetSHR, OffsetSHL);
}
Constant *BitSizeConst = ConstantExpr::getZExt(TIL.Size, IntPtrTy);
Constant *BitSizeConst = ConstantInt::get(IntPtrTy, BSI.BitSize);
Value *OffsetInRange = B.CreateICmpULT(BitOffset, BitSizeConst);
// If the bit set is all ones, testing against it is unnecessary.
if (TIL.TheKind == TypeTestResolution::AllOnes)
if (BSI.isAllOnes())
return OffsetInRange;
TerminatorInst *Term = SplitBlockAndInsertIfThen(OffsetInRange, CI, false);
@ -605,7 +586,7 @@ Value *LowerTypeTestsModule::lowerTypeTestCall(Metadata *TypeId, CallInst *CI,
// Now that we know that the offset is in range and aligned, load the
// appropriate bit from the bitset.
Value *Bit = createBitSetTest(ThenB, TIL, BitOffset);
Value *Bit = createBitSetTest(ThenB, BSI, BAI, BitOffset);
// The value we want is 0 if we came directly from the initial block
// (having failed the range or alignment checks), or the loaded bit if
@ -690,7 +671,11 @@ void LowerTypeTestsModule::buildBitSetsFromGlobalVariables(
void LowerTypeTestsModule::lowerTypeTestCalls(
ArrayRef<Metadata *> TypeIds, Constant *CombinedGlobalAddr,
const DenseMap<GlobalTypeMember *, uint64_t> &GlobalLayout) {
CombinedGlobalAddr = ConstantExpr::getBitCast(CombinedGlobalAddr, Int8PtrTy);
Constant *CombinedGlobalIntAddr =
ConstantExpr::getPtrToInt(CombinedGlobalAddr, IntPtrTy);
DenseMap<GlobalObject *, uint64_t> GlobalObjLayout;
for (auto &P : GlobalLayout)
GlobalObjLayout[P.first->getGlobal()] = P.second;
// For each type identifier in this disjoint set...
for (Metadata *TypeId : TypeIds) {
@ -704,43 +689,13 @@ void LowerTypeTestsModule::lowerTypeTestCalls(
BSI.print(dbgs());
});
TypeIdLowering TIL;
TIL.OffsetedGlobal = ConstantExpr::getGetElementPtr(
Int8Ty, CombinedGlobalAddr, ConstantInt::get(IntPtrTy, BSI.ByteOffset)),
TIL.AlignLog2 = ConstantInt::get(Int8Ty, BSI.AlignLog2);
if (BSI.isAllOnes()) {
TIL.TheKind = (BSI.BitSize == 1) ? TypeTestResolution::Single
: TypeTestResolution::AllOnes;
TIL.SizeBitWidth = (BSI.BitSize <= 256) ? 8 : 32;
TIL.Size = ConstantInt::get((BSI.BitSize <= 256) ? Int8Ty : Int32Ty,
BSI.BitSize);
} else if (BSI.BitSize <= 64) {
TIL.TheKind = TypeTestResolution::Inline;
TIL.SizeBitWidth = (BSI.BitSize <= 32) ? 5 : 6;
TIL.Size = ConstantInt::get(Int8Ty, BSI.BitSize);
uint64_t InlineBits = 0;
for (auto Bit : BSI.Bits)
InlineBits |= uint64_t(1) << Bit;
if (InlineBits == 0)
TIL.TheKind = TypeTestResolution::Unsat;
else
TIL.InlineBits = ConstantInt::get(
(BSI.BitSize <= 32) ? Int32Ty : Int64Ty, InlineBits);
} else {
TIL.TheKind = TypeTestResolution::ByteArray;
TIL.SizeBitWidth = (BSI.BitSize <= 256) ? 8 : 32;
TIL.Size = ConstantInt::get((BSI.BitSize <= 256) ? Int8Ty : Int32Ty,
BSI.BitSize);
++NumByteArraysCreated;
ByteArrayInfo *BAI = createByteArray(BSI);
TIL.TheByteArray = BAI->ByteArray;
TIL.BitMask = BAI->MaskGlobal;
}
ByteArrayInfo *BAI = nullptr;
// Lower each call to llvm.type.test for this type identifier.
for (CallInst *CI : TypeTestCallSites[TypeId]) {
++NumTypeTestCallsLowered;
Value *Lowered = lowerTypeTestCall(TypeId, CI, TIL);
Value *Lowered =
lowerBitSetCall(CI, BSI, BAI, CombinedGlobalIntAddr, GlobalObjLayout);
CI->replaceAllUsesWith(Lowered);
CI->eraseFromParent();
}

6
llvm/test/Transforms/LowerTypeTests/function-disjoint.ll
View File

@ -30,10 +30,10 @@ declare i1 @llvm.type.test(i8* %ptr, metadata %bitset) nounwind readnone
define i1 @foo(i8* %p) {
; X64: icmp eq i64 {{.*}}, ptrtoint (void ()* @[[JT0]] to i64)
; WASM32: icmp eq i64 {{.*}}, ptrtoint (i8* getelementptr (i8, i8* null, i64 1) to i64)
; WASM32: icmp eq i64 {{.*}}, 1
%x = call i1 @llvm.type.test(i8* %p, metadata !"typeid1")
; X64: icmp eq i64 {{.*}}, ptrtoint (void ()* @[[JT1]] to i64)
; WASM32: icmp eq i64 {{.*}}, mul (i64 ptrtoint (i8* getelementptr (i8, i8* null, i32 1) to i64), i64 2)
; WASM32: icmp eq i64 {{.*}}, 2
%y = call i1 @llvm.type.test(i8* %p, metadata !"typeid2")
%z = add i1 %x, %y
ret i1 %z
@ -46,4 +46,4 @@ define i1 @foo(i8* %p) {
; X64: call void asm sideeffect "jmp ${0:c}@plt\0Aint3\0Aint3\0Aint3\0A", "s"(void ()* @g.cfi)
; WASM32: ![[I0]] = !{i64 1}
; WASM32: ![[I1]] = !{i64 2}
; WASM32: ![[I1]] = !{i64 2}

3
llvm/test/Transforms/LowerTypeTests/function-ext.ll
View File

@ -11,7 +11,8 @@ declare !type !0 void @foo()
define i1 @bar(i8* %ptr) {
; X64: icmp eq i64 {{.*}}, ptrtoint (void ()* @[[JT:.*]] to i64)
; WASM32: ret i1 false
; WASM32: sub i64 {{.*}}, 0
; WASM32: icmp ult i64 {{.*}}, 1
%p = call i1 @llvm.type.test(i8* %ptr, metadata !"void")
ret i1 %p
}

2
llvm/test/Transforms/LowerTypeTests/function.ll
View File

@ -42,7 +42,7 @@ declare i1 @llvm.type.test(i8* %ptr, metadata %bitset) nounwind readnone
define i1 @foo(i8* %p) {
; NATIVE: sub i64 {{.*}}, ptrtoint (void ()* @[[JT]] to i64)
; WASM32: sub i64 {{.*}}, ptrtoint (i8* getelementptr (i8, i8* null, i64 1) to i64)
; WASM32: sub i64 {{.*}}, 1
; WASM32: icmp ult i64 {{.*}}, 2
%x = call i1 @llvm.type.test(i8* %p, metadata !"typeid1")
ret i1 %x

3
llvm/test/Transforms/LowerTypeTests/import-unsat.ll
View File

@ -1,5 +1,6 @@
; Test that we correctly import an unsat resolution for type identifier "typeid1".
; RUN: opt -S -lowertypetests -lowertypetests-summary-action=import -lowertypetests-read-summary=%S/Inputs/import-unsat.yaml -lowertypetests-write-summary=%t < %s | FileCheck %s
; FIXME: We should not require -O2 to simplify this to return false.
; RUN: opt -S -lowertypetests -lowertypetests-summary-action=import -lowertypetests-read-summary=%S/Inputs/import-unsat.yaml -lowertypetests-write-summary=%t -O2 < %s | FileCheck %s
; RUN: FileCheck --check-prefix=SUMMARY %s < %t
; SUMMARY: GlobalValueMap:

2
llvm/test/Transforms/LowerTypeTests/simple.ll
View File

@ -92,7 +92,7 @@ define i1 @bar(i32* %p) {
; CHECK: [[S0:%[^ ]*]] = bitcast i32* [[B0]] to i8*
%pi8 = bitcast i32* %p to i8*
; CHECK: [[S1:%[^ ]*]] = ptrtoint i8* [[S0]] to i32
; CHECK: [[S2:%[^ ]*]] = sub i32 [[S1]], ptrtoint (i8* getelementptr (i8, i8* bitcast ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G]] to i8*), i32 4) to i32)
; CHECK: [[S2:%[^ ]*]] = sub i32 [[S1]], add (i32 ptrtoint ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G]] to i32), i32 4)
; CHECK: [[S3:%[^ ]*]] = lshr i32 [[S2]], 8
; CHECK: [[S4:%[^ ]*]] = shl i32 [[S2]], 24
; CHECK: [[S5:%[^ ]*]] = or i32 [[S3]], [[S4]]

2
llvm/test/Transforms/LowerTypeTests/single-offset.ll
View File

@ -24,7 +24,7 @@ define i1 @foo(i8* %p) {
; CHECK: @bar(i8* [[B0:%[^ ]*]])
define i1 @bar(i8* %p) {
; CHECK: [[S0:%[^ ]*]] = ptrtoint i8* [[B0]] to i32
; CHECK: [[S1:%[^ ]*]] = icmp eq i32 [[S0]], ptrtoint (i8* getelementptr (i8, i8* bitcast ({ i32, [0 x i8], i32 }* [[G]] to i8*), i32 4) to i32)
; CHECK: [[S1:%[^ ]*]] = icmp eq i32 [[S0]], add (i32 ptrtoint ({ i32, [0 x i8], i32 }* [[G]] to i32), i32 4)
%x = call i1 @llvm.type.test(i8* %p, metadata !"typeid3")
; CHECK: ret i1 [[S1]]
ret i1 %x

3
llvm/test/Transforms/LowerTypeTests/unsat.ll
View File

@ -1,4 +1,5 @@
; RUN: opt -S -lowertypetests < %s | FileCheck %s
; FIXME: We should not require -O2 to simplify this to return false.
; RUN: opt -S -lowertypetests -O2 < %s | FileCheck %s
target datalayout = "e-p:32:32"