================
@@ -2661,23 +2666,32 @@ class LLVM_ABI_FOR_TEST VPInterleaveEVLRecipe final :
public VPInterleaveBase {
}
};
-/// A recipe to represent inloop reduction operations, performing a reduction
on
-/// a vector operand into a scalar value, and adding the result to a chain.
-/// The Operands are {ChainOp, VecOp, [Condition]}.
+/// A recipe to represent inloop, ordered or partial reduction operations. It
+/// performs a reduction on a vector operand into a scalar (vector in the case
+/// of a partial reduction) value, and adds the result to a chain. The Operands
+/// are {ChainOp, VecOp, [Condition]}.
class LLVM_ABI_FOR_TEST VPReductionRecipe : public VPRecipeWithIRFlags {
/// The recurrence kind for the reduction in question.
RecurKind RdxKind;
bool IsOrdered;
/// Whether the reduction is conditional.
bool IsConditional = false;
+ /// The scaling factor, relative to the VF, that this recipe's output is
+ /// divided by.
+ /// For outer-loop reductions this is equal to 1.
----------------
gbossu wrote:
I think I'm getting a bit confused. In which case do we get a
`VPReductionRecipe` for "outer-loop" reductions? I thought it was only used
when the reduction result was computed inside the loop (sometimes partially).
For "outer-loop" reductions, don't we "widen everything" and compute the
reduction result in the middle block?
https://github.com/llvm/llvm-project/pull/147513
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