[PATCH] D118979: [AArch64] Set maximum VF with shouldMaximizeVectorBandwidth

[JinGu Kang via Phabricator via llvm-commits]

jaykang10 created this revision.
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Set the maximum VF of AArch64 with 128 / the size of smallest type in loop.

The performance improvement from benchmarks is as below.

  SPEC2017
  Benchmark       Improvement(%)
  500.perlbench_r -0.44372
  502.gcc_r        0.11339
  505.mcf_r       -0.36421
  520.omnetpp_r   -0.12037
  523.xalancbmk_r -0.55858
  525.x264_r      0.390159
  531.deepsjeng_r -0.02378
  541.leela_r     -0.01357
  548.exchange2_r -0.00043
  557.xz_r        -0.17387

  Overall improvement(%) on an internal benchmark 0.238949


https://reviews.llvm.org/D118979

Files:
  llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
  llvm/test/Transforms/LoopVectorize/AArch64/extend-vectorization-factor-for-unprofitable-memops.ll
  llvm/test/Transforms/LoopVectorize/AArch64/loop-vectorization-factors.ll
  llvm/test/Transforms/LoopVectorize/AArch64/reduction-small-size.ll

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