[PATCH] D51861: [LSR] Combine unfolded offset into invariant register

[Gil Rapaport via Phabricator via llvm-commits]

gilr created this revision.
gilr added reviewers: qcolombet, sanjoy, craig.topper, sunfish, sebpop, kparzysz, junbuml.
Herald added a reviewer: javed.absar.
Herald added a subscriber: llvm-commits.

LSR reassociates constants as unfolded offsets when the constants fit as immediate add operands, which currently prevents such constants from being combined later with loop invariant registers.

This patch modifies GenerateCombinations() to generate a second formula which includes the unfolded offset in the combined loop-invariant register.


Repository:
  rL LLVM

https://reviews.llvm.org/D51861

Files:
  lib/Transforms/Scalar/LoopStrengthReduce.cpp
  test/Transforms/LoopStrengthReduce/AArch64/small-constant.ll

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