[PATCH] D57514: [X86][AVX] insert_subvector(bitcast(v), bitcast(s), c1) -> bitcast(insert_subvector(v, s, c2))

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, spatel, lebedev.ri, andreadb.

Similar to what we already do in DAGCombiner, but this version also handles bitcasts from types with different scalar sizes, which x86 is better at handling.

I've also included a concat(broadcast(x),broadcast(x)) -> broadcast(x) combine in the patch to demonstrate the main motivation - if accepted this will be committed separately.


Repository:
  rL LLVM

https://reviews.llvm.org/D57514

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/combine-sdiv.ll
  test/CodeGen/X86/insert-into-constant-vector.ll
  test/CodeGen/X86/subvector-broadcast.ll
  test/CodeGen/X86/vector-shuffle-256-v16.ll
  test/CodeGen/X86/widened-broadcast.ll
  test/CodeGen/X86/x86-interleaved-access.ll

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