[llvm] [LV] Bundle partial reductions inside VPExpressionRecipe (PR #147302)

[Sam Tebbs via llvm-commits]

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@@ -2955,12 +2966,14 @@ tryToMatchAndCreateMulAccumulateReduction(VPReductionRecipe *Red,
 
     // Match reduce.add(mul(ext, ext)).
     if (RecipeA && RecipeB &&
-        (RecipeA->getOpcode() == RecipeB->getOpcode() || A == B) &&
+        (RecipeA->getOpcode() == RecipeB->getOpcode() || A == B ||
+         IsPartialReduction) &&
         match(RecipeA, m_ZExtOrSExt(m_VPValue())) &&
         match(RecipeB, m_ZExtOrSExt(m_VPValue())) &&
-        IsMulAccValidAndClampRange(RecipeA->getOpcode() ==
-                                       Instruction::CastOps::ZExt,
-                                   MulR, RecipeA, RecipeB, nullptr, Sub)) {
+        (IsPartialReduction ||
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SamTebbs33 wrote:

I've moved the `IsPartialReduction` check so that it's only used in one place.

https://github.com/llvm/llvm-project/pull/147302