[llvm] [LoopVectorizer] Add support for chaining partial reductions (PR #120272)

[Sam Tebbs via llvm-commits]

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@@ -8860,12 +8875,16 @@ VPRecipeBuilder::getScaledReduction(PHINode *PHI,
   Instruction *ExtA = cast<Instruction>(BinOp->getOperand(0));
   Instruction *ExtB = cast<Instruction>(BinOp->getOperand(1));
 
+  // Check that the extends extend from the same type.
+  if (A->getType() != B->getType())
+    return std::nullopt;
+
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SamTebbs33 wrote:

It used to be checked here until the second re-land of the partial reduction work so it could be back here because of rebasing gone wrong!

https://github.com/llvm/llvm-project/pull/120272