[PATCH] D58361: [x86] allow more 128-bit extract+shufps formation to avoid 256-bit shuffles

[Sanjay Patel via Phabricator via llvm-commits]

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

This is the deferred part of D58181 <https://reviews.llvm.org/D58181>. I think this is the right transform by default for these tests regardless of hasFastVariableShuffle(). Ie, we should only form the wide shuffle op when we know that is profitable because a shuffle mask load + ymm op are probably not faster in general than the narrow alternative.


https://reviews.llvm.org/D58361

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/avx2-conversions.ll
  llvm/test/CodeGen/X86/avx2-vector-shifts.ll
  llvm/test/CodeGen/X86/avx512-shuffles/partial_permute.ll
  llvm/test/CodeGen/X86/combine-shl.ll
  llvm/test/CodeGen/X86/combine-sra.ll
  llvm/test/CodeGen/X86/combine-srl.ll
  llvm/test/CodeGen/X86/oddshuffles.ll
  llvm/test/CodeGen/X86/shuffle-vs-trunc-256-widen.ll
  llvm/test/CodeGen/X86/shuffle-vs-trunc-256.ll
  llvm/test/CodeGen/X86/vector-trunc-math-widen.ll
  llvm/test/CodeGen/X86/vector-trunc-math.ll
  llvm/test/CodeGen/X86/vector-trunc-packus-widen.ll
  llvm/test/CodeGen/X86/vector-trunc-packus.ll
  llvm/test/CodeGen/X86/vector-trunc-ssat-widen.ll
  llvm/test/CodeGen/X86/vector-trunc-ssat.ll
  llvm/test/CodeGen/X86/vector-trunc-usat-widen.ll
  llvm/test/CodeGen/X86/vector-trunc-usat.ll
  llvm/test/CodeGen/X86/vector-trunc-widen.ll
  llvm/test/CodeGen/X86/vector-trunc.ll

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