================
@@ -5754,47 +5540,106 @@ static SDValue combineADDRSPACECAST(SDNode *N,
return SDValue();
}
+static SDValue sinkProxyReg(SDValue R, SDValue Chain,
+ TargetLowering::DAGCombinerInfo &DCI) {
+ switch (R.getOpcode()) {
+ case ISD::TRUNCATE:
+ case ISD::ANY_EXTEND:
+ case ISD::SIGN_EXTEND:
+ case ISD::ZERO_EXTEND:
+ case ISD::BITCAST: {
+ if (SDValue V = sinkProxyReg(R.getOperand(0), Chain, DCI))
+ return DCI.DAG.getNode(R.getOpcode(), SDLoc(R), R.getValueType(), V);
+ return SDValue();
+ }
+ case ISD::SHL:
+ case ISD::SRL:
+ case ISD::SRA:
+ case ISD::OR: {
+ if (SDValue A = sinkProxyReg(R.getOperand(0), Chain, DCI))
+ if (SDValue B = sinkProxyReg(R.getOperand(1), Chain, DCI))
+ return DCI.DAG.getNode(R.getOpcode(), SDLoc(R), R.getValueType(), A,
B);
+ return SDValue();
+ }
+ case ISD::Constant:
+ return R;
+ case ISD::LOAD:
+ case NVPTXISD::LoadV2:
+ case NVPTXISD::LoadV4: {
+ return DCI.DAG.getNode(NVPTXISD::ProxyReg, SDLoc(R), R.getValueType(),
+ {Chain, R});
+ }
+ case ISD::BUILD_VECTOR: {
+ if (DCI.isAfterLegalizeDAG())
+ return SDValue();
+
+ SmallVector<SDValue, 16> Ops;
+ for (auto &Op : R->ops()) {
+ SDValue V = sinkProxyReg(Op, Chain, DCI);
+ if (!V)
+ return SDValue();
+ Ops.push_back(V);
+ }
+ return DCI.DAG.getNode(ISD::BUILD_VECTOR, SDLoc(R), R.getValueType(), Ops);
+ }
+ default:
+ return SDValue();
+ }
+}
+
+static SDValue combineProxyReg(SDNode *N,
+ TargetLowering::DAGCombinerInfo &DCI) {
----------------
AlexMaclean wrote:
This function is fairly simple and really just acts as a central place to call
specific combines (there is only 1 currently). I don't think a comment would
add much value here.
https://github.com/llvm/llvm-project/pull/146930
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