[all-commits] [llvm/llvm-project] f7aeac: [X86][SSE] Add isHorizOp helper function. NFCI.

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f7aeaced658c507c5d5ac6e589f4844588267eef
      https://github.com/llvm/llvm-project/commit/f7aeaced658c507c5d5ac6e589f4844588267eef
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2021-04-01 (Thu, 01 Apr 2021)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp

  Log Message:
  -----------
  [X86][SSE] Add isHorizOp helper function. NFCI.


  Commit: 301319840e112c090b6c424a9ade475b7504b34a
      https://github.com/llvm/llvm-project/commit/301319840e112c090b6c424a9ade475b7504b34a
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2021-04-01 (Thu, 01 Apr 2021)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/horizontal-sum.ll

  Log Message:
  -----------
  [X86][SSE] Enable (F)HADD/SUB handling to SimplifyMultipleUseDemandedVectorElts

Attempt to bypass unused horiz-op operands.

This is very similar to the PACKSS/PACKUS handling - we should try to merge these.


  Commit: abbe80fa52c5286ec929116df6a58d793d6f0d0e
      https://github.com/llvm/llvm-project/commit/abbe80fa52c5286ec929116df6a58d793d6f0d0e
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2021-04-01 (Thu, 01 Apr 2021)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/horizontal-sum.ll

  Log Message:
  -----------
  [X86][SSE] Fold HOP(HOP(X,X),HOP(Y,Y)) -> HOP(PERMUTE(HOP(X,Y)),PERMUTE(HOP(X,Y))

For slow-hop targets, attempt to merge HADD/SUB pairs used in chains.


Compare: https://github.com/llvm/llvm-project/compare/0f5ebbcc7fc3...abbe80fa52c5