[PATCH] D107356: [Lowering] Support lowering of llvm.experimental.ptr.provenance.

[Jeroen Dobbelaere via Phabricator via llvm-commits]

jeroen.dobbelaere updated this revision to Diff 497801.
jeroen.dobbelaere added a comment.

Rebased to: 8c7cfa357280dd93d33b10bbba0fe33797e27d63 <https://reviews.llvm.org/rG8c7cfa357280dd93d33b10bbba0fe33797e27d63>  (Feb 14, 2023)


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D107356/new/

https://reviews.llvm.org/D107356

Files:
  llvm/lib/CodeGen/IntrinsicLowering.cpp
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  llvm/test/CodeGen/Generic/ptr_provenance.ll


Index: llvm/test/CodeGen/Generic/ptr_provenance.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/Generic/ptr_provenance.ll
@@ -0,0 +1,8 @@
+; RUN: llc < %s
+
+define i32* @test(i32* %p, i32* %p.provenance) {
+  %p.joined = call i32* @llvm.experimental.ptr.provenance.p0i32.p0i32(i32* %p, i32* %p.provenance)
+  ret i32* %p.joined
+}
+
+declare i32* @llvm.experimental.ptr.provenance.p0i32.p0i32(i32*, i32*) nounwind readnone
Index: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
===================================================================
--- llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -4164,6 +4164,7 @@
   SmallVector<SDValue, 4> Chains(std::min(MaxParallelChains, NumValues));
   EVT PtrVT = Ptr.getValueType();
 
+  const auto *PtrProvenance = I.getOptionalPtrProvenance().value_or(nullptr);
   unsigned ChainI = 0;
   for (unsigned i = 0; i != NumValues; ++i, ++ChainI) {
     // Serializing loads here may result in excessive register pressure, and
@@ -4184,9 +4185,10 @@
                             DAG.getConstant(Offsets[i], dl, PtrVT),
                             Flags);
 
-    SDValue L = DAG.getLoad(MemVTs[i], dl, Root, A,
-                            MachinePointerInfo(SV, Offsets[i]), Alignment,
-                            MMOFlags, AAInfo, Ranges);
+    SDValue L =
+        DAG.getLoad(MemVTs[i], dl, Root, A,
+                    MachinePointerInfo(SV, Offsets[i], 0, PtrProvenance),
+                    Alignment, MMOFlags, AAInfo, Ranges);
     Chains[ChainI] = L.getValue(1);
 
     if (MemVTs[i] != ValueVTs[i])
@@ -4313,6 +4315,7 @@
   SDNodeFlags Flags;
   Flags.setNoUnsignedWrap(true);
 
+  const auto *PtrProvenance = I.getOptionalPtrProvenance().value_or(nullptr);
   unsigned ChainI = 0;
   for (unsigned i = 0; i != NumValues; ++i, ++ChainI) {
     // See visitLoad comments.
@@ -4328,7 +4331,8 @@
     if (MemVTs[i] != ValueVTs[i])
       Val = DAG.getPtrExtOrTrunc(Val, dl, MemVTs[i]);
     SDValue St =
-        DAG.getStore(Root, dl, Val, Add, MachinePointerInfo(PtrV, Offsets[i]),
+        DAG.getStore(Root, dl, Val, Add,
+                     MachinePointerInfo(PtrV, Offsets[i], 0, PtrProvenance),
                      Alignment, MMOFlags, AAInfo);
     Chains[ChainI] = St;
   }
@@ -6764,6 +6768,7 @@
   case Intrinsic::ptr_annotation:
   case Intrinsic::launder_invariant_group:
   case Intrinsic::strip_invariant_group:
+  case Intrinsic::experimental_ptr_provenance:
     // Drop the intrinsic, but forward the value
     setValue(&I, getValue(I.getOperand(0)));
     return;
Index: llvm/lib/CodeGen/IntrinsicLowering.cpp
===================================================================
--- llvm/lib/CodeGen/IntrinsicLowering.cpp
+++ llvm/lib/CodeGen/IntrinsicLowering.cpp
@@ -333,6 +333,11 @@
   case Intrinsic::var_annotation:
     break;   // Strip out these intrinsics
 
+  case Intrinsic::experimental_ptr_provenance:
+    // Drop the provenance, but forward the value
+    CI->replaceAllUsesWith(CI->getOperand(0));
+    break;
+
   case Intrinsic::memcpy: {
     Type *IntPtr = DL.getIntPtrType(Context);
     Value *Size = Builder.CreateIntCast(CI->getArgOperand(2), IntPtr,


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