[llvm] [LoopVectorizer] Add support for partial reductions (PR #92418)
Graham Hunter via llvm-commits
llvm-commits at lists.llvm.org
Fri Sep 13 03:25:48 PDT 2024
================
@@ -293,6 +293,31 @@ struct FixedScalableVFPair {
bool hasVector() const { return FixedVF.isVector() || ScalableVF.isVector(); }
};
+/// A chain of instructions that form a partial reduction.
+/// Designed to match: reduction_bin_op (bin_op (extend (A), (extend (B))),
+/// accumulator)
+struct PartialReductionChain {
+ /// The top-level binary operation that forms the reduction to a scalar after
+ /// the loop body
+ Instruction *Reduction;
+ /// The inner binary operation that forms the reduction to a vector value
+ /// within the loop body
+ Instruction *BinOp;
+ /// The extension of each of the inner binary operation's operands
+ Instruction *ExtendA;
+ Instruction *ExtendB;
+
+ /// The inner binary operation's operands
+ Value *InputA;
----------------
huntergr-arm wrote:
`InputA` and `InputB` are recorded but never used outside the function which matches them.
https://github.com/llvm/llvm-project/pull/92418
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