[PATCH] D19054: [SystemZ] Support __builtin_thread_pointer.

[Marcin Kościelnicki via llvm-commits]

koriakin updated this revision to Diff 53668.
koriakin added a dependency: D19098: [AArch64] [ARM] Make a target-independent llvm.thread.pointer intrinsic..
koriakin added a comment.

This version depends on http://reviews.llvm.org/D19098.  I'll wait a bit with the clang patch, since I have thread pointer support patches lined up for a new more targets - let's add them all in one go.


Repository:
  rL LLVM

http://reviews.llvm.org/D19054

Files:
  lib/Target/SystemZ/SystemZISelLowering.cpp
  lib/Target/SystemZ/SystemZISelLowering.h
  test/CodeGen/SystemZ/builtins.ll

Index: test/CodeGen/SystemZ/builtins.ll
===================================================================
--- /dev/null
+++ test/CodeGen/SystemZ/builtins.ll
@@ -0,0 +1,14 @@
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Function Attrs: nounwind readnone
+declare i8* @llvm.thread.pointer() #1
+
+define i8* @thread_pointer() {
+; CHECK: thread_pointer:
+; CHECK: ear [[REG1:%r[0-5]]], %a0
+; CHECK: sllg %r2, [[REG1]], 32
+; CHECK: ear %r2, %a1
+; CHECK: br %r14
+  %1 = tail call i8* @llvm.thread.pointer()
+  ret i8* %1
+}
Index: lib/Target/SystemZ/SystemZISelLowering.h
===================================================================
--- lib/Target/SystemZ/SystemZISelLowering.h
+++ lib/Target/SystemZ/SystemZISelLowering.h
@@ -464,6 +464,7 @@
   SDValue lowerTLSGetOffset(GlobalAddressSDNode *Node,
                             SelectionDAG &DAG, unsigned Opcode,
                             SDValue GOTOffset) const;
+  SDValue lowerThreadPointer(const SDLoc &DL, SelectionDAG &DAG) const;
   SDValue lowerGlobalTLSAddress(GlobalAddressSDNode *Node,
                                 SelectionDAG &DAG) const;
   SDValue lowerBlockAddress(BlockAddressSDNode *Node,
Index: lib/Target/SystemZ/SystemZISelLowering.cpp
===================================================================
--- lib/Target/SystemZ/SystemZISelLowering.cpp
+++ lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -2533,14 +2533,9 @@
   return DAG.getCopyFromReg(Chain, DL, SystemZ::R2D, PtrVT, Glue);
 }
 
-SDValue SystemZTargetLowering::lowerGlobalTLSAddress(GlobalAddressSDNode *Node,
-                                                     SelectionDAG &DAG) const {
-  if (DAG.getTarget().Options.EmulatedTLS)
-    return LowerToTLSEmulatedModel(Node, DAG);
-  SDLoc DL(Node);
-  const GlobalValue *GV = Node->getGlobal();
+SDValue SystemZTargetLowering::lowerThreadPointer(const SDLoc &DL,
+                                                  SelectionDAG &DAG) const {
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
-  TLSModel::Model model = DAG.getTarget().getTLSModel(GV);
 
   // The high part of the thread pointer is in access register 0.
   SDValue TPHi = DAG.getNode(SystemZISD::EXTRACT_ACCESS, DL, MVT::i32,
@@ -2555,7 +2550,19 @@
   // Merge them into a single 64-bit address.
   SDValue TPHiShifted = DAG.getNode(ISD::SHL, DL, PtrVT, TPHi,
                                     DAG.getConstant(32, DL, PtrVT));
-  SDValue TP = DAG.getNode(ISD::OR, DL, PtrVT, TPHiShifted, TPLo);
+  return DAG.getNode(ISD::OR, DL, PtrVT, TPHiShifted, TPLo);
+}
+
+SDValue SystemZTargetLowering::lowerGlobalTLSAddress(GlobalAddressSDNode *Node,
+                                                     SelectionDAG &DAG) const {
+  if (DAG.getTarget().Options.EmulatedTLS)
+    return LowerToTLSEmulatedModel(Node, DAG);
+  SDLoc DL(Node);
+  const GlobalValue *GV = Node->getGlobal();
+  EVT PtrVT = getPointerTy(DAG.getDataLayout());
+  TLSModel::Model model = DAG.getTarget().getTLSModel(GV);
+
+  SDValue TP = lowerThreadPointer(DL, DAG);
 
   // Get the offset of GA from the thread pointer, based on the TLS model.
   SDValue Offset;
@@ -3396,6 +3403,9 @@
 
   unsigned Id = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
   switch (Id) {
+  case Intrinsic::thread_pointer:
+    return lowerThreadPointer(SDLoc(Op), DAG);
+
   case Intrinsic::s390_vpdi:
     return DAG.getNode(SystemZISD::PERMUTE_DWORDS, SDLoc(Op), Op.getValueType(),
                        Op.getOperand(1), Op.getOperand(2), Op.getOperand(3));


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