Basic codegen for MTE stack tagging.

Implement IR intrinsics for stack tagging. Generated code is very
unoptimized for now.

Two special intrinsics, llvm.aarch64.irg.sp and llvm.aarch64.tagp are
used to implement a tagged stack frame pointer in a virtual register.

Differential Revision: https://reviews.llvm.org/D64172

llvm-svn: 366360

1 files changed, 13 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 61ec29261c3..e818dd27c05 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -6805,6 +6805,19 @@ void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
     // MachineFunction in SelectionDAGISel::PrepareEHLandingPad. We can safely
     // delete it now.
     return;
+
+  case Intrinsic::aarch64_settag:
+  case Intrinsic::aarch64_settag_zero: {
+    const SelectionDAGTargetInfo &TSI = DAG.getSelectionDAGInfo();
+    bool ZeroMemory = Intrinsic == Intrinsic::aarch64_settag_zero;
+    SDValue Val = TSI.EmitTargetCodeForSetTag(
+        DAG, getCurSDLoc(), getRoot(), getValue(I.getArgOperand(0)),
+        getValue(I.getArgOperand(1)), MachinePointerInfo(I.getArgOperand(0)),
+        ZeroMemory);
+    DAG.setRoot(Val);
+    setValue(&I, Val);
+    return;
+  }
   }
 }