[llvm] [LV] Support EVL for partial reduction and VPExpressionRecipe. (PR #205741)

[Elvis Wang via llvm-commits]

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@@ -3427,13 +3427,15 @@ void VPReductionRecipe::execute(VPTransformState &State) {
 
 void VPReductionEVLRecipe::execute(VPTransformState &State) {
 
+  assert(State.VF.isVector() &&
+         "Shouldn't generate VPReductionEVLRecipe with scalar VF");
   auto &Builder = State.Builder;
   // Propagate the fast-math flags carried by the underlying instruction.
   IRBuilderBase::FastMathFlagGuard FMFGuard(Builder);
   Builder.setFastMathFlags(getFastMathFlagsOrNone());
 
   RecurKind Kind = getRecurrenceKind();
-  Value *Prev = State.get(getChainOp(), /*IsScalar*/ true);
+  Value *Prev = State.get(getChainOp(), !isPartialReduction());
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ElvisWang123 wrote:

Updated, thanks!

https://github.com/llvm/llvm-project/pull/205741