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XtensaISelLowering.cpp: handle musttail (LLVM-267) #73

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XtensaISelLowering.cpp: handle musttail (LLVM-267) #73

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13 changes: 12 additions & 1 deletion llvm/lib/Target/Xtensa/XtensaISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
Expand Down Expand Up @@ -1018,6 +1019,12 @@ SDValue XtensaTargetLowering::getAddrPCRel(SDValue Op,
return DAG.getNode(XtensaISD::PCREL_WRAPPER, DL, Ty, Op);
}

static void fail(const SDLoc &DL, SelectionDAG &DAG, const char *Msg) {
MachineFunction &MF = DAG.getMachineFunction();
DAG.getContext()->diagnose(
DiagnosticInfoUnsupported(MF.getFunction(), Msg, DL.getDebugLoc()));
}

SDValue
XtensaTargetLowering::LowerCall(CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const {
Expand All @@ -1037,7 +1044,11 @@ XtensaTargetLowering::LowerCall(CallLoweringInfo &CLI,
const TargetFrameLowering *TFL = Subtarget.getFrameLowering();

// TODO: Support tail call optimization.
IsTailCall = false;
if (IsTailCall) {
if (CLI.CB && CLI.CB->isMustTailCall())
fail(DL, DAG, "tail call is not implemented");
IsTailCall = false;
}

// Analyze the operands of the call, assigning locations to each operand.
SmallVector<CCValAssign, 16> ArgLocs;
Expand Down