[CodeGen] Add SSID & Atomic Ordering to IntrinsicInfo (#140896)

getTgtMemIntrinsic should be able to propagate such information to the
MMO

Author: Pierre-vh

llvm/include/llvm/CodeGen/TargetLowering.h

@@ -1228,6 +1228,9 @@ class TargetLoweringBase {
     MaybeAlign align = Align(1);   // alignment
 
     MachineMemOperand::Flags flags = MachineMemOperand::MONone;
+    SyncScope::ID ssid = SyncScope::System;
+    AtomicOrdering order = AtomicOrdering::NotAtomic;
+    AtomicOrdering failureOrder = AtomicOrdering::NotAtomic;
     IntrinsicInfo() = default;
   };
 

llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp

@@ -2847,8 +2847,9 @@ bool IRTranslator::translateCall(const User &U, MachineIRBuilder &MIRBuilder) {
       MPI = MachinePointerInfo(Info.ptrVal, Info.offset);
     else if (Info.fallbackAddressSpace)
       MPI = MachinePointerInfo(*Info.fallbackAddressSpace);
-    MIB.addMemOperand(
-        MF->getMachineMemOperand(MPI, Info.flags, MemTy, Alignment, CI.getAAMetadata()));
+    MIB.addMemOperand(MF->getMachineMemOperand(
+        MPI, Info.flags, MemTy, Alignment, CI.getAAMetadata(),
+        /*Ranges=*/nullptr, Info.ssid, Info.order, Info.failureOrder));
   }
 
   if (CI.isConvergent()) {

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -5305,9 +5305,16 @@ void SelectionDAGBuilder::visitTargetIntrinsic(const CallInst &I,
       MPI = MachinePointerInfo(Info.ptrVal, Info.offset);
     else if (Info.fallbackAddressSpace)
       MPI = MachinePointerInfo(*Info.fallbackAddressSpace);
-    Result = DAG.getMemIntrinsicNode(
-        Info.opc, getCurSDLoc(), VTs, Ops, Info.memVT, MPI, Info.align,
-        Info.flags, LocationSize::precise(Info.size), I.getAAMetadata());
+    EVT MemVT = Info.memVT;
+    LocationSize Size = LocationSize::precise(Info.size);
+    if (Size.hasValue() && !Size.getValue())
+      Size = LocationSize::precise(MemVT.getStoreSize());
+    Align Alignment = Info.align.value_or(DAG.getEVTAlign(MemVT));
+    MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
+        MPI, Info.flags, Size, Alignment, I.getAAMetadata(), /*Ranges=*/nullptr,
+        Info.ssid, Info.order, Info.failureOrder);
+    Result =
+        DAG.getMemIntrinsicNode(Info.opc, getCurSDLoc(), VTs, Ops, MemVT, MMO);
   } else if (!HasChain) {
     Result = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, getCurSDLoc(), VTs, Ops);
   } else if (!I.getType()->isVoidTy()) {