[all-commits] [llvm/llvm-project] 0c6423: [ARM][MVE] Teach MVEGatherScatterLowering to merge...

[aWelker via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 0c64233bb7ae760d36a0af3a22324810787fa4ca
      https://github.com/llvm/llvm-project/commit/0c64233bb7ae760d36a0af3a22324810787fa4ca
  Author: Anna Welker <anna.welker at arm.com>
  Date:   2020-07-28 (Tue, 28 Jul 2020)

  Changed paths:
    M llvm/lib/Target/ARM/MVEGatherScatterLowering.cpp
    M llvm/test/CodeGen/Thumb2/mve-gather-ind16-scaled.ll
    M llvm/test/CodeGen/Thumb2/mve-gather-ind32-scaled.ll
    M llvm/test/CodeGen/Thumb2/mve-gather-ind8-unscaled.ll
    A llvm/test/CodeGen/Thumb2/mve-gather-scatter-ptr-address.ll
    M llvm/test/CodeGen/Thumb2/mve-scatter-ind16-scaled.ll
    M llvm/test/CodeGen/Thumb2/mve-scatter-ind32-scaled.ll
    M llvm/test/CodeGen/Thumb2/mve-scatter-ind8-unscaled.ll

  Log Message:
  -----------
  [ARM][MVE] Teach MVEGatherScatterLowering to merge successive getelementpointers

A patch following up on the introduction of pointer induction variables, adding
a preprocessing step to the address optimisation in the MVEGatherScatterLowering
pass. If the getelementpointer that is the address is itself using a
getelementpointer as base, they will be merged into one by summing up the
offsets, after checking that this will not cause an overflow (this can be
repeated recursively).

Differential Revision: https://reviews.llvm.org/D84027