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Revert r295110 and r295144.

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This fails under ASAN:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap/builds/798/steps/check-llvm%20asan/logs/stdio

llvm-svn: 295162
This commit is contained in:
Daniel Jasper 2017-02-15 09:56:08 +00:00
parent 0d84646f4f
commit e27f967c5e
4 changed files with 118 additions and 215 deletions
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254
lib/Transforms/IPO/WholeProgramDevirt.cpp
View File

@ -282,48 +282,6 @@ struct VirtualCallSite {
}
};
// Call site information collected for a specific VTableSlot and possibly a list
// of constant integer arguments. The grouping by arguments is handled by the
// VTableSlotInfo class.
struct CallSiteInfo {
std::vector<VirtualCallSite> CallSites;
};
// Call site information collected for a specific VTableSlot.
struct VTableSlotInfo {
// The set of call sites which do not have all constant integer arguments
// (excluding "this").
CallSiteInfo CSInfo;
// The set of call sites with all constant integer arguments (excluding
// "this"), grouped by argument list.
std::map<std::vector<uint64_t>, CallSiteInfo> ConstCSInfo;
void addCallSite(Value *VTable, CallSite CS, unsigned *NumUnsafeUses);
private:
CallSiteInfo &findCallSiteInfo(CallSite CS);
};
CallSiteInfo &VTableSlotInfo::findCallSiteInfo(CallSite CS) {
std::vector<uint64_t> Args;
auto *CI = dyn_cast<IntegerType>(CS.getType());
if (!CI || CI->getBitWidth() > 64)
return CSInfo;
for (auto &&Arg : make_range(CS.arg_begin() + 1, CS.arg_end())) {
auto *CI = dyn_cast<ConstantInt>(Arg);
if (!CI || CI->getBitWidth() > 64)
return CSInfo;
Args.push_back(CI->getZExtValue());
}
return ConstCSInfo[Args];
}
void VTableSlotInfo::addCallSite(Value *VTable, CallSite CS,
unsigned *NumUnsafeUses) {
findCallSiteInfo(CS).CallSites.push_back({VTable, CS, NumUnsafeUses});
}
struct DevirtModule {
Module &M;
@ -333,11 +291,10 @@ struct DevirtModule {
IntegerType *Int8Ty;
PointerType *Int8PtrTy;
IntegerType *Int32Ty;
IntegerType *Int64Ty;
bool RemarksEnabled;
MapVector<VTableSlot, VTableSlotInfo> CallSlots;
MapVector<VTableSlot, std::vector<VirtualCallSite>> CallSlots;
// This map keeps track of the number of "unsafe" uses of a loaded function
// pointer. The key is the associated llvm.type.test intrinsic call generated
@ -354,7 +311,6 @@ struct DevirtModule {
Int8Ty(Type::getInt8Ty(M.getContext())),
Int8PtrTy(Type::getInt8PtrTy(M.getContext())),
Int32Ty(Type::getInt32Ty(M.getContext())),
Int64Ty(Type::getInt64Ty(M.getContext())),
RemarksEnabled(areRemarksEnabled()) {}
bool areRemarksEnabled();
@ -370,30 +326,19 @@ struct DevirtModule {
tryFindVirtualCallTargets(std::vector<VirtualCallTarget> &TargetsForSlot,
const std::set<TypeMemberInfo> &TypeMemberInfos,
uint64_t ByteOffset);
void applySingleImplDevirt(VTableSlotInfo &SlotInfo, Constant *TheFn);
bool trySingleImplDevirt(MutableArrayRef<VirtualCallTarget> TargetsForSlot,
VTableSlotInfo &SlotInfo);
MutableArrayRef<VirtualCallSite> CallSites);
bool tryEvaluateFunctionsWithArgs(
MutableArrayRef<VirtualCallTarget> TargetsForSlot,
ArrayRef<uint64_t> Args);
void applyUniformRetValOpt(CallSiteInfo &CSInfo, StringRef FnName,
uint64_t TheRetVal);
bool tryUniformRetValOpt(MutableArrayRef<VirtualCallTarget> TargetsForSlot,
CallSiteInfo &CSInfo);
void applyUniqueRetValOpt(CallSiteInfo &CSInfo, StringRef FnName, bool IsOne,
Constant *UniqueMemberAddr);
ArrayRef<ConstantInt *> Args);
bool tryUniformRetValOpt(IntegerType *RetType,
MutableArrayRef<VirtualCallTarget> TargetsForSlot,
MutableArrayRef<VirtualCallSite> CallSites);
bool tryUniqueRetValOpt(unsigned BitWidth,
MutableArrayRef<VirtualCallTarget> TargetsForSlot,
CallSiteInfo &CSInfo);
void applyVirtualConstProp(CallSiteInfo &CSInfo, StringRef FnName,
Constant *Byte, Constant *Bit);
MutableArrayRef<VirtualCallSite> CallSites);
bool tryVirtualConstProp(MutableArrayRef<VirtualCallTarget> TargetsForSlot,
VTableSlotInfo &SlotInfo);
ArrayRef<VirtualCallSite> CallSites);
void rebuildGlobal(VTableBits &B);
@ -574,27 +519,9 @@ bool DevirtModule::tryFindVirtualCallTargets(
return !TargetsForSlot.empty();
}
void DevirtModule::applySingleImplDevirt(VTableSlotInfo &SlotInfo,
Constant *TheFn) {
auto Apply = [&](CallSiteInfo &CSInfo) {
for (auto &&VCallSite : CSInfo.CallSites) {
if (RemarksEnabled)
VCallSite.emitRemark("single-impl", TheFn->getName());
VCallSite.CS.setCalledFunction(ConstantExpr::getBitCast(
TheFn, VCallSite.CS.getCalledValue()->getType()));
// This use is no longer unsafe.
if (VCallSite.NumUnsafeUses)
--*VCallSite.NumUnsafeUses;
}
};
Apply(SlotInfo.CSInfo);
for (auto &P : SlotInfo.ConstCSInfo)
Apply(P.second);
}
bool DevirtModule::trySingleImplDevirt(
MutableArrayRef<VirtualCallTarget> TargetsForSlot,
VTableSlotInfo &SlotInfo) {
MutableArrayRef<VirtualCallSite> CallSites) {
// See if the program contains a single implementation of this virtual
// function.
Function *TheFn = TargetsForSlot[0].Fn;
@ -602,34 +529,39 @@ bool DevirtModule::trySingleImplDevirt(
if (TheFn != Target.Fn)
return false;
// If so, update each call site to call that implementation directly.
if (RemarksEnabled)
TargetsForSlot[0].WasDevirt = true;
applySingleImplDevirt(SlotInfo, TheFn);
// If so, update each call site to call that implementation directly.
for (auto &&VCallSite : CallSites) {
if (RemarksEnabled)
VCallSite.emitRemark("single-impl", TheFn->getName());
VCallSite.CS.setCalledFunction(ConstantExpr::getBitCast(
TheFn, VCallSite.CS.getCalledValue()->getType()));
// This use is no longer unsafe.
if (VCallSite.NumUnsafeUses)
--*VCallSite.NumUnsafeUses;
}
return true;
}
bool DevirtModule::tryEvaluateFunctionsWithArgs(
MutableArrayRef<VirtualCallTarget> TargetsForSlot,
ArrayRef<uint64_t> Args) {
ArrayRef<ConstantInt *> Args) {
// Evaluate each function and store the result in each target's RetVal
// field.
for (VirtualCallTarget &Target : TargetsForSlot) {
if (Target.Fn->arg_size() != Args.size() + 1)
return false;
for (unsigned I = 0; I != Args.size(); ++I)
if (Target.Fn->getFunctionType()->getParamType(I + 1) !=
Args[I]->getType())
return false;
Evaluator Eval(M.getDataLayout(), nullptr);
SmallVector<Constant *, 2> EvalArgs;
EvalArgs.push_back(
Constant::getNullValue(Target.Fn->getFunctionType()->getParamType(0)));
for (unsigned I = 0; I != Args.size(); ++I) {
auto *ArgTy = dyn_cast<IntegerType>(
Target.Fn->getFunctionType()->getParamType(I + 1));
if (!ArgTy)
return false;
EvalArgs.push_back(ConstantInt::get(ArgTy, Args[I]));
}
EvalArgs.insert(EvalArgs.end(), Args.begin(), Args.end());
Constant *RetVal;
if (!Eval.EvaluateFunction(Target.Fn, RetVal, EvalArgs) ||
!isa<ConstantInt>(RetVal))
@ -639,16 +571,9 @@ bool DevirtModule::tryEvaluateFunctionsWithArgs(
return true;
}
void DevirtModule::applyUniformRetValOpt(CallSiteInfo &CSInfo, StringRef FnName,
uint64_t TheRetVal) {
for (auto Call : CSInfo.CallSites)
Call.replaceAndErase(
"uniform-ret-val", FnName, RemarksEnabled,
ConstantInt::get(cast<IntegerType>(Call.CS.getType()), TheRetVal));
}
bool DevirtModule::tryUniformRetValOpt(
MutableArrayRef<VirtualCallTarget> TargetsForSlot, CallSiteInfo &CSInfo) {
IntegerType *RetType, MutableArrayRef<VirtualCallTarget> TargetsForSlot,
MutableArrayRef<VirtualCallSite> CallSites) {
// Uniform return value optimization. If all functions return the same
// constant, replace all calls with that constant.
uint64_t TheRetVal = TargetsForSlot[0].RetVal;
@ -656,28 +581,19 @@ bool DevirtModule::tryUniformRetValOpt(
if (Target.RetVal != TheRetVal)
return false;
applyUniformRetValOpt(CSInfo, TargetsForSlot[0].Fn->getName(), TheRetVal);
auto TheRetValConst = ConstantInt::get(RetType, TheRetVal);
for (auto Call : CallSites)
Call.replaceAndErase("uniform-ret-val", TargetsForSlot[0].Fn->getName(),
RemarksEnabled, TheRetValConst);
if (RemarksEnabled)
for (auto &&Target : TargetsForSlot)
Target.WasDevirt = true;
return true;
}
void DevirtModule::applyUniqueRetValOpt(CallSiteInfo &CSInfo, StringRef FnName,
bool IsOne,
Constant *UniqueMemberAddr) {
for (auto &&Call : CSInfo.CallSites) {
IRBuilder<> B(Call.CS.getInstruction());
Value *Cmp = B.CreateICmp(IsOne ? ICmpInst::ICMP_EQ : ICmpInst::ICMP_NE,
Call.VTable, UniqueMemberAddr);
Cmp = B.CreateZExt(Cmp, Call.CS->getType());
Call.replaceAndErase("unique-ret-val", FnName, RemarksEnabled, Cmp);
}
}
bool DevirtModule::tryUniqueRetValOpt(
unsigned BitWidth, MutableArrayRef<VirtualCallTarget> TargetsForSlot,
CallSiteInfo &CSInfo) {
MutableArrayRef<VirtualCallSite> CallSites) {
// IsOne controls whether we look for a 0 or a 1.
auto tryUniqueRetValOptFor = [&](bool IsOne) {
const TypeMemberInfo *UniqueMember = nullptr;
@ -694,15 +610,15 @@ bool DevirtModule::tryUniqueRetValOpt(
assert(UniqueMember);
// Replace each call with the comparison.
Constant *UniqueMemberAddr =
ConstantExpr::getBitCast(UniqueMember->Bits->GV, Int8PtrTy);
UniqueMemberAddr = ConstantExpr::getGetElementPtr(
Int8Ty, UniqueMemberAddr,
ConstantInt::get(Int64Ty, UniqueMember->Offset));
applyUniqueRetValOpt(CSInfo, TargetsForSlot[0].Fn->getName(), IsOne,
UniqueMemberAddr);
for (auto &&Call : CallSites) {
IRBuilder<> B(Call.CS.getInstruction());
Value *OneAddr = B.CreateBitCast(UniqueMember->Bits->GV, Int8PtrTy);
OneAddr = B.CreateConstGEP1_64(OneAddr, UniqueMember->Offset);
Value *Cmp = B.CreateICmp(IsOne ? ICmpInst::ICMP_EQ : ICmpInst::ICMP_NE,
Call.VTable, OneAddr);
Call.replaceAndErase("unique-ret-val", TargetsForSlot[0].Fn->getName(),
RemarksEnabled, Cmp);
}
// Update devirtualization statistics for targets.
if (RemarksEnabled)
for (auto &&Target : TargetsForSlot)
@ -720,29 +636,9 @@ bool DevirtModule::tryUniqueRetValOpt(
return false;
}
void DevirtModule::applyVirtualConstProp(CallSiteInfo &CSInfo, StringRef FnName,
Constant *Byte, Constant *Bit) {
for (auto Call : CSInfo.CallSites) {
auto *RetType = cast<IntegerType>(Call.CS.getType());
IRBuilder<> B(Call.CS.getInstruction());
Value *Addr = B.CreateGEP(Int8Ty, Call.VTable, Byte);
if (RetType->getBitWidth() == 1) {
Value *Bits = B.CreateLoad(Addr);
Value *BitsAndBit = B.CreateAnd(Bits, Bit);
auto IsBitSet = B.CreateICmpNE(BitsAndBit, ConstantInt::get(Int8Ty, 0));
Call.replaceAndErase("virtual-const-prop-1-bit", FnName, RemarksEnabled,
IsBitSet);
} else {
Value *ValAddr = B.CreateBitCast(Addr, RetType->getPointerTo());
Value *Val = B.CreateLoad(RetType, ValAddr);
Call.replaceAndErase("virtual-const-prop", FnName, RemarksEnabled, Val);
}
}
}
bool DevirtModule::tryVirtualConstProp(
MutableArrayRef<VirtualCallTarget> TargetsForSlot,
VTableSlotInfo &SlotInfo) {
ArrayRef<VirtualCallSite> CallSites) {
// This only works if the function returns an integer.
auto RetType = dyn_cast<IntegerType>(TargetsForSlot[0].Fn->getReturnType());
if (!RetType)
@ -761,11 +657,42 @@ bool DevirtModule::tryVirtualConstProp(
return false;
}
for (auto &&CSByConstantArg : SlotInfo.ConstCSInfo) {
// Group call sites by the list of constant arguments they pass.
// The comparator ensures deterministic ordering.
struct ByAPIntValue {
bool operator()(const std::vector<ConstantInt *> &A,
const std::vector<ConstantInt *> &B) const {
return std::lexicographical_compare(
A.begin(), A.end(), B.begin(), B.end(),
[](ConstantInt *AI, ConstantInt *BI) {
return AI->getValue().ult(BI->getValue());
});
}
};
std::map<std::vector<ConstantInt *>, std::vector<VirtualCallSite>,
ByAPIntValue>
VCallSitesByConstantArg;
for (auto &&VCallSite : CallSites) {
std::vector<ConstantInt *> Args;
if (VCallSite.CS.getType() != RetType)
continue;
for (auto &&Arg :
make_range(VCallSite.CS.arg_begin() + 1, VCallSite.CS.arg_end())) {
if (!isa<ConstantInt>(Arg))
break;
Args.push_back(cast<ConstantInt>(&Arg));
}
if (Args.size() + 1 != VCallSite.CS.arg_size())
continue;
VCallSitesByConstantArg[Args].push_back(VCallSite);
}
for (auto &&CSByConstantArg : VCallSitesByConstantArg) {
if (!tryEvaluateFunctionsWithArgs(TargetsForSlot, CSByConstantArg.first))
continue;
if (tryUniformRetValOpt(TargetsForSlot, CSByConstantArg.second))
if (tryUniformRetValOpt(RetType, TargetsForSlot, CSByConstantArg.second))
continue;
if (tryUniqueRetValOpt(BitWidth, TargetsForSlot, CSByConstantArg.second))
@ -809,10 +736,25 @@ bool DevirtModule::tryVirtualConstProp(
Target.WasDevirt = true;
// Rewrite each call to a load from OffsetByte/OffsetBit.
Constant *ByteConst = ConstantInt::get(Int64Ty, OffsetByte);
Constant *BitConst = ConstantInt::get(Int8Ty, 1ULL << OffsetBit);
applyVirtualConstProp(CSByConstantArg.second,
TargetsForSlot[0].Fn->getName(), ByteConst, BitConst);
for (auto Call : CSByConstantArg.second) {
IRBuilder<> B(Call.CS.getInstruction());
Value *Addr = B.CreateConstGEP1_64(Call.VTable, OffsetByte);
if (BitWidth == 1) {
Value *Bits = B.CreateLoad(Addr);
Value *Bit = ConstantInt::get(Int8Ty, 1ULL << OffsetBit);
Value *BitsAndBit = B.CreateAnd(Bits, Bit);
auto IsBitSet = B.CreateICmpNE(BitsAndBit, ConstantInt::get(Int8Ty, 0));
Call.replaceAndErase("virtual-const-prop-1-bit",
TargetsForSlot[0].Fn->getName(),
RemarksEnabled, IsBitSet);
} else {
Value *ValAddr = B.CreateBitCast(Addr, RetType->getPointerTo());
Value *Val = B.CreateLoad(RetType, ValAddr);
Call.replaceAndErase("virtual-const-prop",
TargetsForSlot[0].Fn->getName(),
RemarksEnabled, Val);
}
}
}
return true;
}
@ -900,8 +842,8 @@ void DevirtModule::scanTypeTestUsers(Function *TypeTestFunc,
Value *Ptr = CI->getArgOperand(0)->stripPointerCasts();
if (SeenPtrs.insert(Ptr).second) {
for (DevirtCallSite Call : DevirtCalls) {
CallSlots[{TypeId, Call.Offset}].addCallSite(CI->getArgOperand(0),
Call.CS, nullptr);
CallSlots[{TypeId, Call.Offset}].push_back(
{CI->getArgOperand(0), Call.CS, nullptr});
}
}
}
@ -987,8 +929,8 @@ void DevirtModule::scanTypeCheckedLoadUsers(Function *TypeCheckedLoadFunc) {
if (HasNonCallUses)
++NumUnsafeUses;
for (DevirtCallSite Call : DevirtCalls) {
CallSlots[{TypeId, Call.Offset}].addCallSite(Ptr, Call.CS,
&NumUnsafeUses);
CallSlots[{TypeId, Call.Offset}].push_back(
{Ptr, Call.CS, &NumUnsafeUses});
}
CI->eraseFromParent();

15
test/Transforms/WholeProgramDevirt/unique-retval.ll
View File

@ -33,8 +33,8 @@ define i1 @call1(i8* %obj) {
ret i1 %result
}
; CHECK: define i32 @call2
define i32 @call2(i8* %obj) {
; CHECK: define i1 @call2
define i1 @call2(i8* %obj) {
%vtableptr = bitcast i8* %obj to [1 x i8*]**
%vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
; CHECK: [[VT2:%[^ ]*]] = bitcast [1 x i8*]* {{.*}} to i8*
@ -43,13 +43,10 @@ define i32 @call2(i8* %obj) {
call void @llvm.assume(i1 %p)
%fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0
%fptr = load i8*, i8** %fptrptr
; Intentional type mismatch to test zero extend.
%fptr_casted = bitcast i8* %fptr to i32 (i8*)*
; CHECK: [[RES2:%[^ ]*]] = icmp ne i8* [[VT1]], bitcast ([1 x i8*]* @vt2 to i8*)
%result = call i32 %fptr_casted(i8* %obj)
; CHECK: [[ZEXT2:%[^ ]*]] = zext i1 [[RES2]] to i32
; CHECK: ret i32 [[ZEXT2:%[^ ]*]]
ret i32 %result
%fptr_casted = bitcast i8* %fptr to i1 (i8*)*
; CHECK: [[RES1:%[^ ]*]] = icmp ne i8* [[VT1]], bitcast ([1 x i8*]* @vt2 to i8*)
%result = call i1 %fptr_casted(i8* %obj)
ret i1 %result
}
declare i1 @llvm.type.test(i8*, metadata)

54
test/Transforms/WholeProgramDevirt/vcp-too-wide-ints.ll
View File

@ -3,63 +3,33 @@
target datalayout = "e-p:64:64"
target triple = "x86_64-unknown-linux-gnu"
@vt1 = constant [1 x i8*] [i8* bitcast (i64 (i8*, i128)* @vf1 to i8*)], !type !0
@vt2 = constant [1 x i8*] [i8* bitcast (i64 (i8*, i128)* @vf2 to i8*)], !type !0
@vt3 = constant [1 x i8*] [i8* bitcast (i128 (i8*, i64)* @vf3 to i8*)], !type !1
@vt4 = constant [1 x i8*] [i8* bitcast (i128 (i8*, i64)* @vf4 to i8*)], !type !1
@vt1 = constant [1 x i8*] [i8* bitcast (i128 (i8*, i128)* @vf1 to i8*)], !type !0
@vt2 = constant [1 x i8*] [i8* bitcast (i128 (i8*, i128)* @vf2 to i8*)], !type !0
define i64 @vf1(i8* %this, i128 %arg) readnone {
%argtrunc = trunc i128 %arg to i64
ret i64 %argtrunc
define i128 @vf1(i8* %this, i128 %arg) readnone {
ret i128 %arg
}
define i64 @vf2(i8* %this, i128 %arg) readnone {
%argtrunc = trunc i128 %arg to i64
ret i64 %argtrunc
define i128 @vf2(i8* %this, i128 %arg) readnone {
ret i128 %arg
}
define i128 @vf3(i8* %this, i64 %arg) readnone {
%argzext = zext i64 %arg to i128
ret i128 %argzext
}
define i128 @vf4(i8* %this, i64 %arg) readnone {
%argzext = zext i64 %arg to i128
ret i128 %argzext
}
; CHECK: define i64 @call1
define i64 @call1(i8* %obj) {
; CHECK: define i128 @call
define i128 @call(i8* %obj) {
%vtableptr = bitcast i8* %obj to [1 x i8*]**
%vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
%vtablei8 = bitcast [1 x i8*]* %vtable to i8*
%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid1")
%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid")
call void @llvm.assume(i1 %p)
%fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0
%fptr = load i8*, i8** %fptrptr
%fptr_casted = bitcast i8* %fptr to i64 (i8*, i128)*
; CHECK: call i64 %
%result = call i64 %fptr_casted(i8* %obj, i128 1)
ret i64 %result
}
; CHECK: define i128 @call2
define i128 @call2(i8* %obj) {
%vtableptr = bitcast i8* %obj to [1 x i8*]**
%vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
%vtablei8 = bitcast [1 x i8*]* %vtable to i8*
%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid2")
call void @llvm.assume(i1 %p)
%fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0
%fptr = load i8*, i8** %fptrptr
%fptr_casted = bitcast i8* %fptr to i128 (i8*, i64)*
%fptr_casted = bitcast i8* %fptr to i128 (i8*, i128)*
; CHECK: call i128 %
%result = call i128 %fptr_casted(i8* %obj, i64 1)
%result = call i128 %fptr_casted(i8* %obj, i128 1)
ret i128 %result
}
declare i1 @llvm.type.test(i8*, metadata)
declare void @llvm.assume(i1)
!0 = !{i32 0, !"typeid1"}
!1 = !{i32 0, !"typeid2"}
!0 = !{i32 0, !"typeid"}

10
test/Transforms/WholeProgramDevirt/vcp-type-mismatch.ll
View File

@ -1,11 +1,5 @@
; RUN: opt -S -wholeprogramdevirt %s | FileCheck %s
; Test that we correctly handle function type mismatches in argument counts
; and bitwidths. We handle an argument count mismatch by refusing
; to optimize. For bitwidth mismatches, we allow the optimization in order
; to simplify the implementation. This is legal because the bitwidth mismatch
; gives the call undefined behavior.
target datalayout = "e-p:64:64"
target triple = "x86_64-unknown-linux-gnu"
@ -30,8 +24,8 @@ define i32 @bad_arg_type(i8* %obj) {
%fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0
%fptr = load i8*, i8** %fptrptr
%fptr_casted = bitcast i8* %fptr to i32 (i8*, i64)*
; CHECK: call i32 %
%result = call i32 %fptr_casted(i8* %obj, i64 1)
; CHECK: ret i32 1
ret i32 %result
}
@ -60,8 +54,8 @@ define i64 @bad_return_type(i8* %obj) {
%fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0
%fptr = load i8*, i8** %fptrptr
%fptr_casted = bitcast i8* %fptr to i64 (i8*, i32)*
; CHECK: call i64 %
%result = call i64 %fptr_casted(i8* %obj, i32 1)
; CHECK: ret i64 1
ret i64 %result
}