2 files changed, 13 insertions, 4 deletions
diff --git a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
index 783369c8200..924bae31a12 100644
--- a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -519,15 +519,18 @@ bool SITargetLowering::getTgtMemIntrinsic(IntrinsicInfo &Info,
                                           unsigned IntrID) const {
   switch (IntrID) {
   case Intrinsic::amdgcn_atomic_inc:
-  case Intrinsic::amdgcn_atomic_dec:
+  case Intrinsic::amdgcn_atomic_dec: {
     Info.opc = ISD::INTRINSIC_W_CHAIN;
     Info.memVT = MVT::getVT(CI.getType());
     Info.ptrVal = CI.getOperand(0);
     Info.align = 0;
-    Info.vol = false;
+
+    const ConstantInt *Vol = dyn_cast<ConstantInt>(CI.getOperand(4));
+    Info.vol = !Vol || !Vol->isNullValue();
     Info.readMem = true;
     Info.writeMem = true;
     return true;
+  }
   default:
     return false;
   }
diff --git a/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp b/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
index 96da4bf2e0d..5d8701431a2 100644
--- a/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
+++ b/llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
@@ -230,9 +230,15 @@ bool InferAddressSpaces::rewriteIntrinsicOperands(IntrinsicInst *II,
   Module *M = II->getParent()->getParent()->getParent();
 
   switch (II->getIntrinsicID()) {
-  case Intrinsic::objectsize:
   case Intrinsic::amdgcn_atomic_inc:
-  case Intrinsic::amdgcn_atomic_dec: {
+  case Intrinsic::amdgcn_atomic_dec:{
+    const ConstantInt *IsVolatile = dyn_cast<ConstantInt>(II->getArgOperand(4));
+    if (!IsVolatile || !IsVolatile->isNullValue())
+      return false;
+
+    LLVM_FALLTHROUGH;
+  }
+  case Intrinsic::objectsize: {
     Type *DestTy = II->getType();
     Type *SrcTy = NewV->getType();
     Function *NewDecl =