[SPARC] Add support for llvm.thread.pointer.

Differential Revision: http://reviews.llvm.org/D19387

llvm-svn: 267544

3 files changed, 29 insertions, 0 deletions

diff --git a/llvm/lib/Target/Sparc/SparcISelLowering.cpp b/llvm/lib/Target/Sparc/SparcISelLowering.cpp
index 304f07f38c9..527d052258d 100644
--- a/llvm/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/llvm/lib/Target/Sparc/SparcISelLowering.cpp
@@ -1799,6 +1799,8 @@ SparcTargetLowering::SparcTargetLowering(TargetMachine &TM,
     }
   }
 
+  setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
+
   setMinFunctionAlignment(2);
 
   computeRegisterProperties(Subtarget->getRegisterInfo());
@@ -2960,6 +2962,19 @@ static SDValue LowerATOMIC_LOAD_STORE(SDValue Op, SelectionDAG &DAG) {
   return Op;
 }
 
+SDValue SparcTargetLowering::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::thread_pointer: {
+    EVT PtrVT = getPointerTy(DAG.getDataLayout());
+    return DAG.getRegister(SP::G7, PtrVT);
+  }
+  }
+}
+
 SDValue SparcTargetLowering::
 LowerOperation(SDValue Op, SelectionDAG &DAG) const {
 
@@ -3018,6 +3033,7 @@ LowerOperation(SDValue Op, SelectionDAG &DAG) const {
   case ISD::SMULO:              return LowerUMULO_SMULO(Op, DAG, *this);
   case ISD::ATOMIC_LOAD:
   case ISD::ATOMIC_STORE:       return LowerATOMIC_LOAD_STORE(Op, DAG);
+  case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
   }
 }
 
diff --git a/llvm/lib/Target/Sparc/SparcISelLowering.h b/llvm/lib/Target/Sparc/SparcISelLowering.h
index 5ee0256aca6..5eee611bf61 100644
--- a/llvm/lib/Target/Sparc/SparcISelLowering.h
+++ b/llvm/lib/Target/Sparc/SparcISelLowering.h
@@ -174,6 +174,8 @@ namespace llvm {
                              SDLoc DL,
                              SelectionDAG &DAG) const;
 
+    SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
+
     bool ShouldShrinkFPConstant(EVT VT) const override {
       // Do not shrink FP constpool if VT == MVT::f128.
       // (ldd, call _Q_fdtoq) is more expensive than two ldds.
diff --git a/llvm/test/CodeGen/SPARC/thread-pointer.ll b/llvm/test/CodeGen/SPARC/thread-pointer.ll
new file mode 100644
index 00000000000..33e99aa9474
--- /dev/null
+++ b/llvm/test/CodeGen/SPARC/thread-pointer.ll
@@ -0,0 +1,11 @@
+; RUN: llc < %s -mtriple=sparc-unknown-linux-gnu | FileCheck %s
+; RUN: llc < %s -mtriple=sparc64-unknown-linux-gnu | FileCheck %s
+
+; Function Attrs: nounwind readnone
+declare i8* @llvm.thread.pointer() #1
+
+define i8* @thread_pointer() {
+; CHECK: mov %g7, %o0
+  %1 = tail call i8* @llvm.thread.pointer()
+  ret i8* %1
+}