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Decorating vptr load & stores with !invariant.group

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Adding !invariant.group to vptr load/stores for devirtualization purposes.
For more goto:
http://lists.llvm.org/pipermail/cfe-dev/2015-July/044227.html

http://reviews.llvm.org/D12026

llvm-svn: 247725
This commit is contained in:
Piotr Padlewski
2015-09-15 21:46:55 +00:00
parent 9d0ecf27a7
commit 4b1ac72cd4
10 changed files with 144 additions and 28 deletions
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24
clang/lib/CodeGen/CGClass.cpp
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@@ -25,6 +25,7 @@
#include "clang/CodeGen/CGFunctionInfo.h"
#include "clang/Frontend/CodeGenOptions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Metadata.h"
using namespace clang;
using namespace CodeGen;
@@ -2087,7 +2088,8 @@ void CodeGenFunction::EmitVTableAssumptionLoad(const VPtr &Vptr, Address This) {
ApplyNonVirtualAndVirtualOffset(*this, This, NonVirtualOffset, nullptr,
Vptr.VTableClass, Vptr.NearestVBase);
llvm::Value *VPtrValue = GetVTablePtr(This, VTableGlobal->getType());
llvm::Value *VPtrValue =
GetVTablePtr(This, VTableGlobal->getType(), Vptr.VTableClass);
llvm::Value *Cmp =
Builder.CreateICmpEQ(VPtrValue, VTableGlobal, "cmp.vtables");
Builder.CreateAssumption(Cmp);
@@ -2306,7 +2308,10 @@ void CodeGenFunction::InitializeVTablePointer(const VPtr &Vptr) {
VTableAddressPoint = Builder.CreateBitCast(VTableAddressPoint, VTablePtrTy);
llvm::StoreInst *Store = Builder.CreateStore(VTableAddressPoint, VTableField);
CGM.DecorateInstruction(Store, CGM.getTBAAInfoForVTablePtr());
CGM.DecorateInstructionWithTBAA(Store, CGM.getTBAAInfoForVTablePtr());
if (CGM.getCodeGenOpts().OptimizationLevel > 0 &&
CGM.getCodeGenOpts().StrictVTablePointers)
CGM.DecorateInstructionWithInvariantGroup(Store, Vptr.VTableClass);
}
CodeGenFunction::VPtrsVector
@@ -2393,10 +2398,16 @@ void CodeGenFunction::InitializeVTablePointers(const CXXRecordDecl *RD) {
}
llvm::Value *CodeGenFunction::GetVTablePtr(Address This,
llvm::Type *Ty) {
Address VTablePtrSrc = Builder.CreateElementBitCast(This, Ty);
llvm::Type *VTableTy,
const CXXRecordDecl *RD) {
Address VTablePtrSrc = Builder.CreateElementBitCast(This, VTableTy);
llvm::Instruction *VTable = Builder.CreateLoad(VTablePtrSrc, "vtable");
CGM.DecorateInstruction(VTable, CGM.getTBAAInfoForVTablePtr());
CGM.DecorateInstructionWithTBAA(VTable, CGM.getTBAAInfoForVTablePtr());
if (CGM.getCodeGenOpts().OptimizationLevel > 0 &&
CGM.getCodeGenOpts().StrictVTablePointers)
CGM.DecorateInstructionWithInvariantGroup(VTable, RD);
return VTable;
}
@@ -2481,7 +2492,8 @@ void CodeGenFunction::EmitVTablePtrCheckForCast(QualType T,
}
llvm::Value *VTable =
GetVTablePtr(Address(Derived, getPointerAlign()), Int8PtrTy);
GetVTablePtr(Address(Derived, getPointerAlign()), Int8PtrTy, ClassDecl);
EmitVTablePtrCheck(ClassDecl, VTable, TCK, Loc);
if (MayBeNull) {