[all-commits] [llvm/llvm-project] 1ed7f8: [LAA] Support pointer phis in loop by analyzing ea...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1ed7f8ede564c3b11da4fdca30c36ccbff422576
      https://github.com/llvm/llvm-project/commit/1ed7f8ede564c3b11da4fdca30c36ccbff422576
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2021-04-28 (Wed, 28 Apr 2021)

  Changed paths:
    M llvm/lib/Analysis/LoopAccessAnalysis.cpp
    M llvm/test/Analysis/LoopAccessAnalysis/pointer-phis.ll
    M llvm/test/Transforms/LoopVectorize/vectorize-pointer-phis.ll

  Log Message:
  -----------
  [LAA] Support pointer phis in loop by analyzing each incoming pointer.

SCEV does not look through non-header PHIs inside the loop. Such phis
can be analyzed by adding separate accesses for each incoming pointer
value.

This results in 2 more loops vectorized in SPEC2000/186.crafty and
avoids regressions when sinking instructions before vectorizing.

Reviewed By: Meinersbur

Differential Revision: https://reviews.llvm.org/D101286