================
@@ -4704,6 +4707,23 @@ SDValue DAGTypeLegalizer::SplitVecOp_STORE(StoreSDNode
*N, unsigned OpNo) {
return DAG.getNode(ISD::TokenFactor, DL, MVT::Other, Lo, Hi);
}
+SDValue DAGTypeLegalizer::SplitVecOp_ATOMIC_STORE(AtomicSDNode *N) {
+ SDLoc DL(N);
+ SDValue StVal = N->getVal();
+ EVT VT = StVal.getValueType();
+
+ // Issue a single atomic store of an integer that spans the full memory
+ // width. Bitcasting the (illegal) vector value to that integer lets the
+ // type legalizer further legalize the BITCAST input as needed, while the
+ // ATOMIC_STORE itself uses only the legal integer type.
+ EVT IntVT = EVT::getIntegerVT(*DAG.getContext(), VT.getSizeInBits());
----------------
jofrn wrote:
It does apply to those; however, it doesn't matter per se that there is no
legal type if so since AtomicExpand.cpp's `atomicSizeSupported`'s call to
`TLI->getMaxAtomicSizeInBitsSupported() / 8` will lower these types to library
calls instead, i.e. before the DAG lowers them.
https://github.com/llvm/llvm-project/pull/197860
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