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[BasicAA] Add Vscale GEP decomposition on variable index #69152

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[BasicAA] Add Vscale GEP decomposition on variable index #69152

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Commits on Jan 16, 2024

  1. [BasicAA] Add Vscale GEP decomposition on variable index 

      Enable BasicAA to be done on Scalable GEP & LocationSize
  Scalable GEP expression such as @llvm.vscale and GEP of scalable type
  are attached to the VariableGEPIndex, with Val representing Vscale.

  VScale AA works if there's only one variable index (the vscale) and
  constant offsets in the GEP for now
    @harviniriawan @davemgreen
    harviniriawan authored and davemgreen committed Jan 16, 2024
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  2. Updates and extra testing

    @davemgreen
    davemgreen committed Jan 16, 2024
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  3. Add VScaleSentinel and remove the useful part

    @davemgreen
    davemgreen committed Jan 16, 2024
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