[llvm] [WIP] Fold (bitwiseop X, (add (not Y), Z)) -> (bitwiseop X, (not (sub Y, Z))). (PR #141476)

[Matt Arsenault via llvm-commits]

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@@ -7528,6 +7528,13 @@ SDValue DAGCombiner::visitAND(SDNode *N) {
       return DAG.getNode(ISD::AND, DL, VT, X,
                          DAG.getNOT(DL, DAG.getNode(Opc, DL, VT, Y, Z), VT));
 
+  // Fold (and X, (add (not Y), Z)) -> (and X, (not (sub Y, Z)))
+  if (sd_match(N, m_And(m_Value(X), m_Add(m_Value(NotY), m_Value(Z)))) &&
+      sd_match(NotY, m_Not(m_Value(Y))) &&
+      (TLI.hasAndNot(SDValue(N, 0)) || NotY->hasOneUse()))
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arsenm wrote:

Swap these checks 

https://github.com/llvm/llvm-project/pull/141476