Fix @llvm.frameaddress codegen. FP elimination optimization should be disabled when frame address is desired. Also add support for depth > 0.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56683 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 267be34..d8d5db9 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -5645,13 +5645,13 @@
}
SDValue X86TargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) {
- // Depths > 0 not supported yet!
- if (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() > 0)
- return SDValue();
-
- SDValue RetAddrFI = getReturnAddressFrameIndex(DAG);
- return DAG.getNode(ISD::SUB, getPointerTy(), RetAddrFI,
- DAG.getIntPtrConstant(TD->getPointerSize()));
+ unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
+ unsigned FrameReg = Subtarget->is64Bit() ? X86::RBP : X86::EBP;
+ SDValue FrameAddr = DAG.getRegister(FrameReg, getPointerTy());
+ while (Depth--)
+ FrameAddr = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), FrameAddr,
+ NULL, 0);
+ return FrameAddr;
}
SDValue X86TargetLowering::LowerFRAME_TO_ARGS_OFFSET(SDValue Op,