[all-commits] [llvm/llvm-project] d65cc8: [SLP]Do not schedule instructions with constants/a...

[Andrew V. Tischenko via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d65cc8597792ab04142cd2214c46c5c167191bcd
      https://github.com/llvm/llvm-project/commit/d65cc8597792ab04142cd2214c46c5c167191bcd
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2022-03-17 (Thu, 17 Mar 2022)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/AArch64/gather-reduce.ll
    M llvm/test/Transforms/SLPVectorizer/AArch64/gather-root.ll
    M llvm/test/Transforms/SLPVectorizer/AArch64/spillcost-di.ll
    M llvm/test/Transforms/SLPVectorizer/X86/PR35628_2.ll
    M llvm/test/Transforms/SLPVectorizer/X86/PR40310.ll
    M llvm/test/Transforms/SLPVectorizer/X86/crash_exceed_scheduling.ll
    M llvm/test/Transforms/SLPVectorizer/X86/opaque-ptr.ll
    M llvm/test/Transforms/SLPVectorizer/X86/pr47629-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/pr47629.ll
    M llvm/test/Transforms/SLPVectorizer/X86/shrink_after_reorder2.ll
    M llvm/test/Transforms/SLPVectorizer/X86/vectorize-widest-phis.ll
    M llvm/test/Transforms/SLPVectorizer/slp-max-phi-size.ll

  Log Message:
  -----------
  [SLP]Do not schedule instructions with constants/argument/phi operands and external users.

No need to schedule entry nodes where all instructions are not memory
read/write instructions and their operands are either constants, or
arguments, or phis, or instructions from others blocks, or their users
are phis or from the other blocks.
The resulting vector instructions can be placed at
the beginning of the basic block without scheduling (if operands does
not need to be scheduled) or at the end of the block (if users are
outside of the block).
It may save some compile time and scheduling resources.

Differential Revision: https://reviews.llvm.org/D121121