diff options
Diffstat (limited to 'clang/lib')
-rw-r--r-- | clang/lib/CodeGen/ItaniumCXXABI.cpp | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/clang/lib/CodeGen/ItaniumCXXABI.cpp b/clang/lib/CodeGen/ItaniumCXXABI.cpp index 8392f6a7ba2..37b49dc6086 100644 --- a/clang/lib/CodeGen/ItaniumCXXABI.cpp +++ b/clang/lib/CodeGen/ItaniumCXXABI.cpp @@ -1609,7 +1609,16 @@ llvm::Value *ItaniumCXXABI::getVirtualFunctionPointer(CodeGenFunction &CGF, uint64_t VTableIndex = CGM.getItaniumVTableContext().getMethodVTableIndex(GD); llvm::Value *VFuncPtr = CGF.Builder.CreateConstInBoundsGEP1_64(VTable, VTableIndex, "vfn"); - return CGF.Builder.CreateAlignedLoad(VFuncPtr, CGF.getPointerAlign()); + auto *Inst = CGF.Builder.CreateAlignedLoad(VFuncPtr, CGF.getPointerAlign()); + + // It's safe to add "invariant.load" without -fstrict-vtable-pointers, but it + // would not help in devirtualization. + if (CGM.getCodeGenOpts().OptimizationLevel > 0 && + CGM.getCodeGenOpts().StrictVTablePointers) + Inst->setMetadata(llvm::LLVMContext::MD_invariant_load, + llvm::MDNode::get(CGM.getLLVMContext(), + llvm::ArrayRef<llvm::Metadata *>())); + return Inst; } llvm::Value *ItaniumCXXABI::EmitVirtualDestructorCall( |