[llvm] [WebAssembly] Handle wide mask reductions in performSETCCCombine (PR #189358)

[Demetrius Kanios via llvm-commits]

================
@@ -3452,6 +3431,124 @@ static SDValue TryMatchTrue(SDNode *N, EVT VecVT, SelectionDAG &DAG) {
   return DAG.getZExtOrTrunc(Ret, DL, N->getValueType(0));
 }
 
+enum class MaskReduceKind {
+  AnyTrue,
+  AllTrue,
+};
+
+struct MaskReduceInfo {
+  MaskReduceKind Kind;
+  bool Invert;
+};
+
+static SDValue combineSmallMaskReduction(SDNode *N, EVT FromVT,
+                                         unsigned NumElts,
+                                         const MaskReduceInfo &Info,
+                                         SelectionDAG &DAG) {
+  EVT VecVT = FromVT.changeVectorElementType(*DAG.getContext(),
+                                             MVT::getIntegerVT(128 / NumElts));
+
+  switch (Info.Kind) {
+  case MaskReduceKind::AnyTrue:
+    if (!Info.Invert)
+      return TryMatchTrue<0, ISD::SETNE, false, Intrinsic::wasm_anytrue>(
+          N, VecVT, DAG);
+    return TryMatchTrue<0, ISD::SETEQ, true, Intrinsic::wasm_anytrue>(N, VecVT,
----------------
QuantumSegfault wrote:

Not necessarily a good idea, but you could collapse the if into the parameters.

```suggestion
    return TryMatchTrue<0, Info.Invert ? ISD::SETEQ : ISD::SETNE, Info.Invert, Intrinsic::wasm_anytrue>(N, VecVT,
```



https://github.com/llvm/llvm-project/pull/189358