[llvm] Missing AArch64ISD::BICi handling (PR #76644)

[Simon Pilgrim via llvm-commits]

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@@ -26658,6 +26670,18 @@ bool AArch64TargetLowering::SimplifyDemandedBitsForTargetNode(
     // used - simplify to just Val.
     return TLO.CombineTo(Op, ShiftR->getOperand(0));
   }
+  case AArch64ISD::BICi: {
+    // Fold BICi if all destination bits already known to be zeroed
+    SDValue Op0 = Op.getOperand(0);
+    KnownBits KnownOp0 = TLO.DAG.computeKnownBits(Op0, 0);
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RKSimon wrote:

Use the computeKnownBits variant with OriginalDemandedElts

Don't reset the recursion depth - it must be Depth + 1

https://github.com/llvm/llvm-project/pull/76644