diff options
Diffstat (limited to 'lib/CodeGen/CGExprScalar.cpp')
| -rw-r--r-- | lib/CodeGen/CGExprScalar.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/CodeGen/CGExprScalar.cpp b/lib/CodeGen/CGExprScalar.cpp index 7e26971..42bf68e 100644 --- a/lib/CodeGen/CGExprScalar.cpp +++ b/lib/CodeGen/CGExprScalar.cpp @@ -769,6 +769,9 @@ Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) { static bool ShouldNullCheckClassCastValue(const CastExpr *CE) { const Expr *E = CE->getSubExpr(); + + if (CE->getCastKind() == CastExpr::CK_UncheckedDerivedToBase) + return false; if (isa<CXXThisExpr>(E)) { // We always assume that 'this' is never null. @@ -826,6 +829,7 @@ Value *ScalarExprEmitter::EmitCastExpr(CastExpr *CE) { return CGF.GetAddressOfDerivedClass(Src, BaseClassDecl, DerivedClassDecl, NullCheckValue); } + case CastExpr::CK_UncheckedDerivedToBase: case CastExpr::CK_DerivedToBase: { const RecordType *DerivedClassTy = E->getType()->getAs<PointerType>()->getPointeeType()->getAs<RecordType>(); @@ -1337,6 +1341,11 @@ Value *ScalarExprEmitter::EmitSub(const BinOpInfo &Ops) { if (Ops.LHS->getType()->isFPOrFPVectorTy()) return Builder.CreateFSub(Ops.LHS, Ops.RHS, "sub"); + + // Signed integer overflow is undefined behavior. + if (Ops.Ty->isSignedIntegerType()) + return Builder.CreateNSWSub(Ops.LHS, Ops.RHS, "sub"); + return Builder.CreateSub(Ops.LHS, Ops.RHS, "sub"); } |
