diff options
Diffstat (limited to 'lib/CodeGen/CGExprScalar.cpp')
| -rw-r--r-- | lib/CodeGen/CGExprScalar.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/CodeGen/CGExprScalar.cpp b/lib/CodeGen/CGExprScalar.cpp index 7e26971414..1ef06ccf6f 100644 --- a/lib/CodeGen/CGExprScalar.cpp +++ b/lib/CodeGen/CGExprScalar.cpp @@ -1337,6 +1337,11 @@ 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"); } |