[PATCH] D11534: [AArch64] Implement __builtin_thread_pointer

[Adhemerval Zanella]

zatrazz created this revision.
zatrazz added reviewers: t.p.northover, rengolin, jmolloy.
zatrazz added a subscriber: llvm-commits.
Herald added subscribers: rengolin, aemerson.

This path add the aarch64 lowering of __builtin_thread_pointer.  It uses
the already implemented AArch64ISD::THREAD_POINTER used in TLS generation.

http://reviews.llvm.org/D11534

Files:
  include/llvm/IR/IntrinsicsAArch64.td
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  test/CodeGen/AArch64/arm64-builtins-linux.ll

Index: test/CodeGen/AArch64/arm64-builtins-linux.ll
===================================================================
--- /dev/null
+++ test/CodeGen/AArch64/arm64-builtins-linux.ll
@@ -0,0 +1,11 @@
+; RUN: llc < %s -march=arm64 -mtriple=arm64-linux-gnu | FileCheck %s
+
+; Function Attrs: nounwind readnone
+declare i8* @llvm.aarch64.thread.pointer() #1
+
+define i8* @thread_pointer() {
+; CHECK: thread_pointer:
+; CHECK: mrs {{x[0-9]+}}, TPIDR_EL0
+  %1 = tail call i8* @llvm.aarch64.thread.pointer()
+  ret i8* %1
+}
Index: lib/Target/AArch64/AArch64ISelLowering.h
===================================================================
--- lib/Target/AArch64/AArch64ISelLowering.h
+++ lib/Target/AArch64/AArch64ISelLowering.h
@@ -397,6 +397,8 @@
                           SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals,
                           bool isThisReturn, SDValue ThisVal) const;
 
+  SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
+
   bool isEligibleForTailCallOptimization(
       SDValue Callee, CallingConv::ID CalleeCC, bool isVarArg,
       bool isCalleeStructRet, bool isCallerStructRet,
Index: lib/Target/AArch64/AArch64ISelLowering.cpp
===================================================================
--- lib/Target/AArch64/AArch64ISelLowering.cpp
+++ lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -519,6 +519,8 @@
 
   setHasExtractBitsInsn(true);
 
+  setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
+
   if (Subtarget->hasNEON()) {
     // FIXME: v1f64 shouldn't be legal if we can avoid it, because it leads to
     // silliness like this:
@@ -2158,6 +2160,19 @@
                                DAG.getNode(ISD::BITCAST, DL, Op1VT, N01), Op1));
 }
 
+SDValue AArch64TargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
+                                                     SelectionDAG &DAG) const {
+  unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
+  SDLoc dl(Op);
+  switch (IntNo) {
+  default: return SDValue();    // Don't custom lower most intrinsics.
+  case Intrinsic::aarch64_thread_pointer: {
+    EVT PtrVT = getPointerTy(DAG.getDataLayout());
+    return DAG.getNode(AArch64ISD::THREAD_POINTER, dl, PtrVT);
+  }
+  }
+}
+
 SDValue AArch64TargetLowering::LowerOperation(SDValue Op,
                                               SelectionDAG &DAG) const {
   switch (Op.getOpcode()) {
@@ -2259,6 +2274,8 @@
     return LowerFSINCOS(Op, DAG);
   case ISD::MUL:
     return LowerMUL(Op, DAG);
+  case ISD::INTRINSIC_WO_CHAIN:
+    return LowerINTRINSIC_WO_CHAIN(Op, DAG);
   }
 }
 
Index: include/llvm/IR/IntrinsicsAArch64.td
===================================================================
--- include/llvm/IR/IntrinsicsAArch64.td
+++ include/llvm/IR/IntrinsicsAArch64.td
@@ -13,6 +13,9 @@
 
 let TargetPrefix = "aarch64" in {
 
+def int_aarch64_thread_pointer : GCCBuiltin<"__builtin_thread_pointer">,
+            Intrinsic<[llvm_ptr_ty], [], [IntrNoMem]>;
+
 def int_aarch64_ldxr : Intrinsic<[llvm_i64_ty], [llvm_anyptr_ty]>;
 def int_aarch64_ldaxr : Intrinsic<[llvm_i64_ty], [llvm_anyptr_ty]>;
 def int_aarch64_stxr : Intrinsic<[llvm_i32_ty], [llvm_i64_ty, llvm_anyptr_ty]>;


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