================
@@ -2627,6 +2629,93 @@ SDValue DAGCombiner::foldSubToAvg(SDNode *N, const SDLoc
&DL) {
return SDValue();
}
+/// Try to fold a pointer arithmetic node.
+/// This needs to be done separately from normal addition, because pointer
+/// addition is not commutative.
+SDValue DAGCombiner::visitPTRADD(SDNode *N) {
+ SDValue N0 = N->getOperand(0);
+ SDValue N1 = N->getOperand(1);
+ EVT PtrVT = N0.getValueType();
+ EVT IntVT = N1.getValueType();
+ SDLoc DL(N);
+
+ // This is already ensured by an assert in SelectionDAG::getNode(). Several
+ // combines here depend on this assumption.
+ assert(PtrVT == IntVT &&
+ "PTRADD with different operand types is not supported");
+
+ // fold (ptradd undef, y) -> undef
+ if (N0.isUndef())
----------------
arichardson wrote:
Nice, I was not aware of those folds. Do we already have tests for them? If not
it would be nice to add one here (but don't consider this a blocker).
https://github.com/llvm/llvm-project/pull/142739
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