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Don't take the time to CheckDAGForTailCallsAndFixThem when tail calls

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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
This commit is contained in:
Dan Gohman 2008-09-16 01:42:28 +00:00
parent c7e42fd5b2
commit 1937e2f6ca
2 changed files with 10 additions and 4 deletions
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11
lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
View File

@ -4201,7 +4201,8 @@ void SelectionDAGLowering::LowerCallTo(CallSite CS, SDValue Callee,
TLI.LowerCallTo(getRoot(), CS.getType(),
CS.paramHasAttr(0, ParamAttr::SExt),
CS.paramHasAttr(0, ParamAttr::ZExt),
FTy->isVarArg(), CS.getCallingConv(), IsTailCall,
FTy->isVarArg(), CS.getCallingConv(),
IsTailCall && PerformTailCallOpt,
Callee, Args, DAG);
if (CS.getType() != Type::VoidTy)
setValue(CS.getInstruction(), Result.first);
@ -5138,7 +5139,8 @@ void SelectionDAGLowering::visitMalloc(MallocInst &I) {
std::pair<SDValue,SDValue> Result =
TLI.LowerCallTo(getRoot(), I.getType(), false, false, false, CallingConv::C,
true, DAG.getExternalSymbol("malloc", IntPtr), Args, DAG);
PerformTailCallOpt, DAG.getExternalSymbol("malloc", IntPtr),
Args, DAG);
setValue(&I, Result.first); // Pointers always fit in registers
DAG.setRoot(Result.second);
}
@ -5152,7 +5154,7 @@ void SelectionDAGLowering::visitFree(FreeInst &I) {
MVT IntPtr = TLI.getPointerTy();
std::pair<SDValue,SDValue> Result =
TLI.LowerCallTo(getRoot(), Type::VoidTy, false, false, false,
CallingConv::C, true,
CallingConv::C, PerformTailCallOpt,
DAG.getExternalSymbol("free", IntPtr), Args, DAG);
DAG.setRoot(Result.second);
}
@ -5323,6 +5325,9 @@ TargetLowering::LowerCallTo(SDValue Chain, const Type *RetTy,
unsigned CallingConv, bool isTailCall,
SDValue Callee,
ArgListTy &Args, SelectionDAG &DAG) {
assert((!isTailCall || PerformTailCallOpt) &&
"isTailCall set when tail-call optimizations are disabled!");
SmallVector<SDValue, 32> Ops;
Ops.push_back(Chain); // Op#0 - Chain
Ops.push_back(Callee);

3
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -526,7 +526,8 @@ void SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB,
// with correct tailcall attribute so that the target can rely on the tailcall
// attribute indicating whether the call is really eligible for tail call
// optimization.
CheckDAGForTailCallsAndFixThem(*CurDAG, TLI);
if (PerformTailCallOpt)
CheckDAGForTailCallsAndFixThem(*CurDAG, TLI);
// Final step, emit the lowered DAG as machine code.
CodeGenAndEmitDAG();