[PowerPC] Add support for llvm.thread.pointer
Differential Revision: http://reviews.llvm.org/D19304
llvm-svn: 267546
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 72335a4..15efeb8 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -7715,6 +7715,16 @@
/// lower, do it, otherwise return null.
SDValue PPCTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
SelectionDAG &DAG) const {
+ unsigned IntrinsicID =
+ cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
+
+ if (IntrinsicID == Intrinsic::thread_pointer) {
+ // Reads the thread pointer register, used for __builtin_thread_pointer.
+ bool is64bit = Subtarget.isPPC64();
+ return DAG.getRegister(is64bit ? PPC::X13 : PPC::R2,
+ is64bit ? MVT::i64 : MVT::i32);
+ }
+
// If this is a lowered altivec predicate compare, CompareOpc is set to the
// opcode number of the comparison.
SDLoc dl(Op);