Custom-lower FRAMEADDR. Patch by Sasa Stankovic.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132444 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Mips/MipsFrameLowering.cpp b/lib/Target/Mips/MipsFrameLowering.cpp
index 3b7e051439bc406ead354eeb9fc92e5243ddd9a1..091c1b248fb9269b16a520c5f1bb725f77289be7 100644 (file)
--- a/lib/Target/Mips/MipsFrameLowering.cpp
+++ b/lib/Target/Mips/MipsFrameLowering.cpp
@@ -84,7 +84,8 @@ using namespace llvm;
 // if frame pointer elimination is disabled.
 bool MipsFrameLowering::hasFP(const MachineFunction &MF) const {
   const MachineFrameInfo *MFI = MF.getFrameInfo();
-  return DisableFramePointerElim(MF) || MFI->hasVarSizedObjects();
+  return DisableFramePointerElim(MF) || MFI->hasVarSizedObjects()
+      || MFI->isFrameAddressTaken();
 }
 
 bool MipsFrameLowering::targetHandlesStackFrameRounding() const {

diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index f737fd35d9bdd422f6d87b8f76a786b09f7e19ab..d6ac5ef1848a85ac3703ed7cadff980e0dfacf37 100644 (file)
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -523,6 +523,7 @@ LowerOperation(SDValue Op, SelectionDAG &DAG) const
     case ISD::SELECT:             return LowerSELECT(Op, DAG);
     case ISD::VASTART:            return LowerVASTART(Op, DAG);
     case ISD::FCOPYSIGN:          return LowerFCOPYSIGN(Op, DAG);
+    case ISD::FRAMEADDR:          return LowerFRAMEADDR(Op, DAG);
   }
   return SDValue();
 }
@@ -1551,6 +1552,19 @@ SDValue MipsTargetLowering::LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG)
     return LowerFCOPYSIGN64(Op, DAG, Subtarget->isLittle());
 }
 
+SDValue MipsTargetLowering::
+LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
+  unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
+  assert((Depth == 0) && "Frame address can only be determined for current frame.");
+
+  MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
+  MFI->setFrameAddressIsTaken(true);
+  EVT VT = Op.getValueType();
+  DebugLoc dl = Op.getDebugLoc();
+  SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, Mips::FP, VT);
+  return FrameAddr;
+}
+
 //===----------------------------------------------------------------------===//
 //                      Calling Convention Implementation
 //===----------------------------------------------------------------------===//

diff --git a/lib/Target/Mips/MipsISelLowering.h b/lib/Target/Mips/MipsISelLowering.h
index 7c6b6e7596d0a24c47b2890111cbcb3f42dfd8e7..fbcedfddf99a7ed0bf30f3a4e5351a5ede5d4352 100644 (file)
--- a/lib/Target/Mips/MipsISelLowering.h
+++ b/lib/Target/Mips/MipsISelLowering.h
@@ -125,6 +125,7 @@ namespace llvm {
     SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
 
     virtual SDValue
       LowerFormalArguments(SDValue Chain,