[llvm] [VPlan] Add support for VPWidenIntOrFpInductionRecipe in predicated D… (PR #115274)

[Shih-Po Hung via llvm-commits]

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@@ -1022,6 +1023,8 @@ bool VPWidenIntrinsicRecipe::onlyFirstLaneUsed(const VPValue *Op) const {
   assert(is_contained(operands(), Op) && "Op must be an operand of the recipe");
   // Vector predication intrinsics only demand the the first lane the last
   // operand (the EVL operand).
+  if (VectorIntrinsicID == Intrinsic::experimental_vp_splat)
+    return Op == getOperand(0);
   return VPIntrinsic::isVPIntrinsic(VectorIntrinsicID) &&
          Op == getOperand(getNumOperands() - 1);
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arcbbb wrote:

I think the condition `Op == getOperand(getNumOperands() - 1)` only checks for EVL operand, but for vp.splat, the first operand is also a scalar use.

https://github.com/llvm/llvm-project/pull/115274