[PATCH] D109434: [X86][AVX] Add missing X86ISD::VBROADCAST(128->256) isel patterns for AVX1 targets

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: yubing, pengfei, LuoYuanke, lebedev.ri, spatel.
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An alternative to D109348 <https://reviews.llvm.org/D109348>, this adds fallback broadcast patterns on AVX1 targets instead.

I've added AVX2 test coverage to help show a missing fold - where the vbroadcastsd_ymm(vbroadcastss_load_xmm()) should be foldable to a single vbroadcastss_load_ymm() on AVX1 and AVX2 targets if we create the broadcast nodes.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D109434

Files:
  llvm/lib/Target/X86/X86InstrSSE.td
  llvm/test/CodeGen/X86/combine-concatvectors.ll

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