[PATCH] D72575: [x86] try harder to form 256-bit unpck*

[Sanjay Patel via Phabricator via llvm-commits]

spatel created this revision.
spatel added reviewers: craig.topper, RKSimon.
Herald added subscribers: hiraditya, mcrosier.
Herald added a project: LLVM.

This is another part of a problem noted in PR42024:
https://bugs.llvm.org/show_bug.cgi?id=42024

The AVX2 code may use awkward 256-bit shuffles vs. the AVX code that gets split into the expected 128-bit unpack instructions. We have to be selective in matching the types where we try to do this though. Otherwise, we can end up with more instructions (in the case of v8x32/v4x64).


https://reviews.llvm.org/D72575

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h
  llvm/test/CodeGen/X86/vector-interleave.ll
  llvm/test/CodeGen/X86/vector-shuffle-256-v8.ll

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