From 7efdca5622cfd472ccca6fd2b0b830e526abbd48 Mon Sep 17 00:00:00 2001
From: Marcin Koscielnicki <koriakin@0x04.net>
Date: Wed, 27 Apr 2016 17:21:49 +0000
Subject: [PATCH] [Mips] Add support for llvm.thread.pointer intrinsic.

This will be used to implement __builtin_thread_pointer in clang.

Differential Revision: http://reviews.llvm.org/D19569

llvm-svn: 267743
---
 llvm/lib/Target/Mips/MipsSEISelLowering.cpp |  4 ++++
 llvm/test/CodeGen/Mips/thread-pointer.ll    | 12 ++++++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 llvm/test/CodeGen/Mips/thread-pointer.ll

diff --git a/llvm/lib/Target/Mips/MipsSEISelLowering.cpp b/llvm/lib/Target/Mips/MipsSEISelLowering.cpp
index 1f5ef2fc8d8f..9812a9793182 100644
--- a/llvm/lib/Target/Mips/MipsSEISelLowering.cpp
+++ b/llvm/lib/Target/Mips/MipsSEISelLowering.cpp
@@ -2166,6 +2166,10 @@ SDValue MipsSETargetLowering::lowerINTRINSIC_WO_CHAIN(SDValue Op,
   case Intrinsic::mips_xori_b:
     return DAG.getNode(ISD::XOR, DL, Op->getValueType(0),
                        Op->getOperand(1), lowerMSASplatImm(Op, 2, DAG));
+  case Intrinsic::thread_pointer: {
+    EVT PtrVT = getPointerTy(DAG.getDataLayout());
+    return DAG.getNode(MipsISD::ThreadPointer, DL, PtrVT);
+  }
   }
 }
 
diff --git a/llvm/test/CodeGen/Mips/thread-pointer.ll b/llvm/test/CodeGen/Mips/thread-pointer.ll
new file mode 100644
index 000000000000..60bee3d03031
--- /dev/null
+++ b/llvm/test/CodeGen/Mips/thread-pointer.ll
@@ -0,0 +1,12 @@
+; RUN: llc -march=mips < %s | FileCheck %s
+; RUN: llc -march=mips64 < %s | FileCheck %s
+; RUN: llc -march=mipsel < %s | FileCheck %s
+; RUN: llc -march=mips64el < %s | FileCheck %s
+
+declare i8* @llvm.thread.pointer() nounwind readnone
+
+define i8* @thread_pointer() {
+; CHECK: rdhwr $3, $29
+  %1 = tail call i8* @llvm.thread.pointer()
+  ret i8* %1
+}