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Don't take the time to CheckDAGForTailCallsAndFixThem when tail calls
are not enabled. Instead just omit the tail call flag when calls are created. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56235 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -4201,7 +4201,8 @@ void SelectionDAGLowering::LowerCallTo(CallSite CS, SDValue Callee,
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TLI.LowerCallTo(getRoot(), CS.getType(),
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CS.paramHasAttr(0, ParamAttr::SExt),
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CS.paramHasAttr(0, ParamAttr::ZExt),
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FTy->isVarArg(), CS.getCallingConv(), IsTailCall,
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FTy->isVarArg(), CS.getCallingConv(),
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IsTailCall && PerformTailCallOpt,
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Callee, Args, DAG);
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if (CS.getType() != Type::VoidTy)
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setValue(CS.getInstruction(), Result.first);
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@ -5138,7 +5139,8 @@ void SelectionDAGLowering::visitMalloc(MallocInst &I) {
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std::pair<SDValue,SDValue> Result =
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TLI.LowerCallTo(getRoot(), I.getType(), false, false, false, CallingConv::C,
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true, DAG.getExternalSymbol("malloc", IntPtr), Args, DAG);
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PerformTailCallOpt, DAG.getExternalSymbol("malloc", IntPtr),
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Args, DAG);
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setValue(&I, Result.first); // Pointers always fit in registers
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DAG.setRoot(Result.second);
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}
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@ -5152,7 +5154,7 @@ void SelectionDAGLowering::visitFree(FreeInst &I) {
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MVT IntPtr = TLI.getPointerTy();
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std::pair<SDValue,SDValue> Result =
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TLI.LowerCallTo(getRoot(), Type::VoidTy, false, false, false,
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CallingConv::C, true,
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CallingConv::C, PerformTailCallOpt,
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DAG.getExternalSymbol("free", IntPtr), Args, DAG);
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DAG.setRoot(Result.second);
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}
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@ -5323,6 +5325,9 @@ TargetLowering::LowerCallTo(SDValue Chain, const Type *RetTy,
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unsigned CallingConv, bool isTailCall,
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SDValue Callee,
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ArgListTy &Args, SelectionDAG &DAG) {
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assert((!isTailCall || PerformTailCallOpt) &&
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"isTailCall set when tail-call optimizations are disabled!");
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SmallVector<SDValue, 32> Ops;
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Ops.push_back(Chain); // Op#0 - Chain
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Ops.push_back(Callee);
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@ -526,7 +526,8 @@ void SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB,
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// with correct tailcall attribute so that the target can rely on the tailcall
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// attribute indicating whether the call is really eligible for tail call
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// optimization.
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CheckDAGForTailCallsAndFixThem(*CurDAG, TLI);
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if (PerformTailCallOpt)
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CheckDAGForTailCallsAndFixThem(*CurDAG, TLI);
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// Final step, emit the lowered DAG as machine code.
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CodeGenAndEmitDAG();
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