[PATCH] D106532: [ARM] Attempt to distribute reductions
Dave Green via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Jul 22 02:16:11 PDT 2021
dmgreen created this revision.
dmgreen added reviewers: samtebbs, SjoerdMeijer, NickGuy, ostannard, simon_tatham.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
dmgreen requested review of this revision.
Herald added a project: LLVM.
This adds a combine for adds of reductions, distributing them so that they occur sequentially to enable better use of accumulating VADDVA instructions. It combines:
add(X, add(vecreduce(Y), vecreduce(Z))) -> add(add(X, vecreduce(Y)), vecreduce(Z))
and
add(add(A, reduce(B)), add(C, reduce(D))) -> add(add(add(A, C), reduce(B)), reduce(D))
These together distribute the add's so that more reductions can be selected to VADDVA.
https://reviews.llvm.org/D106532
Files:
llvm/lib/Target/ARM/ARMISelLowering.cpp
llvm/test/CodeGen/Thumb2/mve-vaddv.ll
llvm/test/CodeGen/Thumb2/mve-vecreduce-slp.ll
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