[WebAssembly] Fix ADJCALLSTACKDOWN/UP use/defs

[oota-llvm.git] / lib / Target / WebAssembly / WebAssemblyISelLowering.cpp

diff --git a/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp b/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
index 4ef0846d311a2a0f31e2984747b5ddc460d9a155..76df63b54074bce38f86734ebaf2e1ca12c3f08d 100644 (file)
--- a/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
+++ b/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
@@ -359,8 +359,11 @@ WebAssemblyTargetLowering::LowerCall(CallLoweringInfo &CLI,
 
   unsigned NumBytes = CCInfo.getAlignedCallFrameSize();
 
-  auto NB = DAG.getConstant(NumBytes, DL, PtrVT, true);
-  Chain = DAG.getCALLSEQ_START(Chain, NB, DL);
+  SDValue NB;
+  if (NumBytes) {
+    NB = DAG.getConstant(NumBytes, DL, PtrVT, true);
+    Chain = DAG.getCALLSEQ_START(Chain, NB, DL);
+  }
 
   if (IsVarArg) {
     // For non-fixed arguments, next emit stores to store the argument values
@@ -420,8 +423,10 @@ WebAssemblyTargetLowering::LowerCall(CallLoweringInfo &CLI,
     Chain = Res.getValue(1);
   }
 
-  SDValue Unused = DAG.getUNDEF(PtrVT);
-  Chain = DAG.getCALLSEQ_END(Chain, NB, Unused, SDValue(), DL);
+  if (NumBytes) {
+    SDValue Unused = DAG.getUNDEF(PtrVT);
+    Chain = DAG.getCALLSEQ_END(Chain, NB, Unused, SDValue(), DL);
+  }
 
   return Chain;
 }