[ARM] Implement __builtin_thread_pointer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43892 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 48 insertions, 1 deletions

diff --git a/include/llvm/Intrinsics.td b/include/llvm/Intrinsics.td
index 9819f38952..4ede06d408 100644
--- a/include/llvm/Intrinsics.td
+++ b/include/llvm/Intrinsics.td
@@ -268,3 +268,4 @@ def int_init_trampoline : Intrinsic<[llvm_ptr_ty, llvm_ptr_ty, llvm_ptr_ty,
 
 include "llvm/IntrinsicsPowerPC.td"
 include "llvm/IntrinsicsX86.td"
+include "llvm/IntrinsicsARM.td"
diff --git a/include/llvm/IntrinsicsARM.td b/include/llvm/IntrinsicsARM.td
new file mode 100644
index 0000000000..1830931c1d
--- /dev/null
+++ b/include/llvm/IntrinsicsARM.td
@@ -0,0 +1,21 @@
+//===- IntrinsicsARM.td - Defines ARM intrinsics -----------*- tablegen -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Lauro Ramos Venancio and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file defines all of the ARM-specific intrinsics.
+//
+//===----------------------------------------------------------------------===//
+
+
+//===----------------------------------------------------------------------===//
+// TLS
+
+let TargetPrefix = "arm" in {  // All intrinsics start with "llvm.arm.".
+  def int_arm_thread_pointer : GCCBuiltin<"__builtin_thread_pointer">,
+              Intrinsic<[llvm_ptr_ty],[IntrNoMem]>;
+}
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index bc2c7c3e1e..fd2550229e 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -23,6 +23,7 @@
 #include "llvm/CallingConv.h"
 #include "llvm/Constants.h"
 #include "llvm/Instruction.h"
+#include "llvm/Intrinsics.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
@@ -213,7 +214,10 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
   if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb())
     // Turn f64->i64 into FMRRD iff target supports vfp2.
     setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
-  
+
+  // We want to custom lower some of our intrinsics.
+  setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
+
   setOperationAction(ISD::SETCC    , MVT::i32, Expand);
   setOperationAction(ISD::SETCC    , MVT::f32, Expand);
   setOperationAction(ISD::SETCC    , MVT::f64, Expand);
@@ -882,6 +886,16 @@ SDOperand ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDOperand Op,
   return DAG.getNode(ARMISD::PIC_ADD, PtrVT, Result, PICLabel);
 }
 
+static SDOperand LowerINTRINSIC_WO_CHAIN(SDOperand Op, SelectionDAG &DAG) {
+  MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
+  unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getValue();
+  switch (IntNo) {
+  default: return SDOperand();    // Don't custom lower most intrinsics.
+  case Intrinsic::arm_thread_pointer:
+      return DAG.getNode(ARMISD::THREAD_POINTER, PtrVT);
+  }
+}
+
 static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
                               unsigned VarArgsFrameIndex) {
   // vastart just stores the address of the VarArgsFrameIndex slot into the
@@ -1410,6 +1424,7 @@ SDOperand ARMTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
   case ISD::FRAMEADDR:     break;
   case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
   case ISD::MEMCPY:        return LowerMEMCPY(Op, DAG);
+  case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
   }
   return SDOperand();
 }
diff --git a/test/CodeGen/ARM/thread_pointer.ll b/test/CodeGen/ARM/thread_pointer.ll
new file mode 100644
index 0000000000..6476b483d7
--- /dev/null
+++ b/test/CodeGen/ARM/thread_pointer.ll
@@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | llc -march=arm -mtriple=arm-linux-gnueabi | \
+; RUN:     grep {__aeabi_read_tp}
+
+define i8* @test() {
+entry:
+	%tmp1 = call i8* @llvm.arm.thread.pointer( )		; <i8*> [#uses=0]
+	ret i8* %tmp1
+}
+
+declare i8* @llvm.arm.thread.pointer()