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<p class=MsoNormal>I have intrinsic with no return value and I need to match
them to machine instructions. If the instruction has a return value I am able
to correctly match it, but if I try to create some tablegen code that has no
return value, the instruction gets deleted.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Here is my profile/node/pattern.<o:p></o:p></p>
<p class=MsoNormal>Profile:<o:p></o:p></p>
<p class=MsoNormal>def SDTIL_BinAtomNoRet : SDTypeProfile<0, 3, [<o:p></o:p></p>
<p class=MsoNormal> SDTCisPtrTy<0>, SDTCisVT<1,
i32>, SDTCisVT<2, i32><o:p></o:p></p>
<p class=MsoNormal> ]>;<o:p></o:p></p>
<p class=MsoNormal>Node:<o:p></o:p></p>
<p class=MsoNormal>def atom_g_add_noret :
SDNode<"AMDILISD::ATOM_G_ADD_NORET", SDTIL_BinAtomNoRet,
[SDNPHasChain]>;<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Pattern:<o:p></o:p></p>
<p class=MsoNormal>def ATOM_G_ADD_NORET :
BinAtomNoRet<IL_OP_UAV_ADD, <o:p></o:p></p>
<p class=MsoNormal> "_id($id)",
atom_g_add_noret>;<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am Lowering INTRINSIC_W_CHAIN to lower from
@llvm.amdil.atomic.add.gi32.noret to the correct instruction with the following
code sequence.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>LowerINTRINSIC_W_CHAIN(…)<o:p></o:p></p>
<p class=MsoNormal>{<o:p></o:p></p>
<p class=MsoNormal>…<o:p></o:p></p>
<p class=MsoNormal>case AMDILIntrinsic::AMDIL_atomic_add_gu32_noret:<o:p></o:p></p>
<p class=MsoNormal>
IntNo = AMDILISD::ATOM_G_ADD_NORET; break;<o:p></o:p></p>
<p class=MsoNormal>…<o:p></o:p></p>
<p class=MsoNormal> SDValue Ops[6];<o:p></o:p></p>
<p class=MsoNormal> SDValue chain = Op.getOperand(0);<o:p></o:p></p>
<p class=MsoNormal> unsigned numNodes = 0;<o:p></o:p></p>
<p class=MsoNormal> if (inChain) {<o:p></o:p></p>
<p class=MsoNormal> Ops[numNodes++] = chain;<o:p></o:p></p>
<p class=MsoNormal> }<o:p></o:p></p>
<p class=MsoNormal> SDValue Chain = Op.getOperand(0);<o:p></o:p></p>
<p class=MsoNormal> Ops[numNodes++] = Op.getOperand((inChain) ? 2 : 1);<o:p></o:p></p>
<p class=MsoNormal> Ops[numNodes++] = DAG.getConstant(1, MVT::i32);<o:p></o:p></p>
<p class=MsoNormal> Ops[numNodes++] = DAG.getTargetConstant(0, MVT::i32);<o:p></o:p></p>
<p class=MsoNormal> Op = DAG.getNode(IntNo, dl, EVT::EVT(MVT::i32), Ops,
numNodes);<o:p></o:p></p>
<p class=MsoNormal> if (outChain) {<o:p></o:p></p>
<p class=MsoNormal> SDValue mv[2] = {Op, chain};<o:p></o:p></p>
<p class=MsoNormal> Op = DAG.getMergeValues(mv, 2, dl);<o:p></o:p></p>
<p class=MsoNormal> }<o:p></o:p></p>
<p class=MsoNormal> return Op;<o:p></o:p></p>
<p class=MsoNormal>}<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m guessing I am not handling the chain correctly,
but I’m not sure what I am doing wrong. Can someone point me to an
example of matching an intrinsic to a machine instruction with no return value?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal>Micah<o:p></o:p></p>
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