[llvm] [RISCV] Handle scalable ops with < EEW / 2 narrow types in combineBinOp_VLToVWBinOp_VL (PR #84158)

[Craig Topper via llvm-commits]

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@@ -13644,24 +13644,17 @@ struct NodeExtensionHelper {
     SupportsFPExt = false;
     EnforceOneUse = true;
     CheckMask = true;
+    SDValue NarrowOp;
     unsigned Opc = OrigOperand.getOpcode();
     switch (Opc) {
     case ISD::ZERO_EXTEND:
     case ISD::SIGN_EXTEND: {
+      NarrowOp = OrigOperand.getOperand(0);
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topperc wrote:

Can't se just check for i1 in this case? None of the other cases can have an i1 narrow op past type legalization.

https://github.com/llvm/llvm-project/pull/84158