[all-commits] [llvm/llvm-project] 666faa: [DAG] visitEXTRACT_SUBVECTOR - accumulate Simplify...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 666faa7fd98b7a58e089a38083f33c067ed5b955
      https://github.com/llvm/llvm-project/commit/666faa7fd98b7a58e089a38083f33c067ed5b955
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-03-29 (Sat, 29 Mar 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/X86/any_extend_vector_inreg_of_broadcast.ll
    M llvm/test/CodeGen/X86/pr42905.ll
    M llvm/test/CodeGen/X86/sad.ll
    M llvm/test/CodeGen/X86/vector-interleaved-store-i16-stride-7.ll
    M llvm/test/CodeGen/X86/vector-reduce-fmax-fmin-fast.ll
    M llvm/test/CodeGen/X86/vector-reduce-fmax-nnan.ll
    M llvm/test/CodeGen/X86/vector-reduce-fmin-nnan.ll
    M llvm/test/CodeGen/X86/vector-reduce-mul.ll
    M llvm/test/CodeGen/X86/zero_extend_vector_inreg_of_broadcast_from_memory.ll

  Log Message:
  -----------
  [DAG] visitEXTRACT_SUBVECTOR - accumulate SimplifyDemandedVectorElts demanded elts across all EXTRACT_SUBVECTOR uses (REAPPLIED) (#133401)

Similar to what is done for visitEXTRACT_VECTOR_ELT - if all uses of a vector are EXTRACT_SUBVECTOR, then determine the accumulated demanded elts across all users and call SimplifyDemandedVectorElts in "AssumeSingleUse" use.

Second try after #133130 was reverted by #133331 due to it affecting reverted test files



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