[all-commits] [llvm/llvm-project] 0b38af: [AArch64] match splat of bitcasted extract subvect...

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  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 0b38af89e2c0adc13a6efb1dd04485229ef0d1c6
      https://github.com/llvm/llvm-project/commit/0b38af89e2c0adc13a6efb1dd04485229ef0d1c6
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2019-12-22 (Sun, 22 Dec 2019)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/arm64-neon-2velem.ll

  Log Message:
  -----------
  [AArch64] match splat of bitcasted extract subvector to DUPLANE

This is another potential regression exposed by D63815.

Here we peek through a bitcast to find an extract subvector and
scale the splat offset based on that:
splat (bitcast (extract X, C)), LaneC --> duplane (bitcast X), LaneC'

Differential Revision: https://reviews.llvm.org/D71672