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DAG: Implement softening for fp atomic store #90840

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Merged
arsenm merged 1 commit into from
May 2, 2024
Merged

DAG: Implement softening for fp atomic store #90840

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18 changes: 18 additions & 0 deletions llvm/lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -946,6 +946,9 @@ bool DAGTypeLegalizer::SoftenFloatOperand(SDNode *N, unsigned OpNo) {
case ISD::STRICT_FSETCCS:
case ISD::SETCC: Res = SoftenFloatOp_SETCC(N); break;
case ISD::STORE: Res = SoftenFloatOp_STORE(N, OpNo); break;
case ISD::ATOMIC_STORE:
Res = SoftenFloatOp_ATOMIC_STORE(N, OpNo);
break;
case ISD::FCOPYSIGN: Res = SoftenFloatOp_FCOPYSIGN(N); break;
}

Expand Down Expand Up @@ -1172,6 +1175,21 @@ SDValue DAGTypeLegalizer::SoftenFloatOp_STORE(SDNode *N, unsigned OpNo) {
ST->getMemOperand());
}

SDValue DAGTypeLegalizer::SoftenFloatOp_ATOMIC_STORE(SDNode *N, unsigned OpNo) {
assert(ISD::isUNINDEXEDStore(N) && "Indexed store during type legalization!");
assert(OpNo == 1 && "Can only soften the stored value!");
AtomicSDNode *ST = cast<AtomicSDNode>(N);
SDValue Val = ST->getVal();
EVT VT = Val.getValueType();
SDLoc dl(N);

assert(ST->getMemoryVT() == VT && "truncating atomic store not handled");

SDValue NewVal = GetSoftenedFloat(Val);
return DAG.getAtomic(ISD::ATOMIC_STORE, dl, VT, ST->getChain(), NewVal,
ST->getBasePtr(), ST->getMemOperand());
}

SDValue DAGTypeLegalizer::SoftenFloatOp_FCOPYSIGN(SDNode *N) {
SDValue LHS = N->getOperand(0);
SDValue RHS = BitConvertToInteger(N->getOperand(1));
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1 change: 1 addition & 0 deletions llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
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Expand Up @@ -592,6 +592,7 @@ class LLVM_LIBRARY_VISIBILITY DAGTypeLegalizer {
SDValue SoftenFloatOp_SELECT_CC(SDNode *N);
SDValue SoftenFloatOp_SETCC(SDNode *N);
SDValue SoftenFloatOp_STORE(SDNode *N, unsigned OpNo);
SDValue SoftenFloatOp_ATOMIC_STORE(SDNode *N, unsigned OpNo);
SDValue SoftenFloatOp_FCOPYSIGN(SDNode *N);

//===--------------------------------------------------------------------===//
Expand Down