[all-commits] [llvm/llvm-project] 06f3b0: Revert "[SLP]Improve costs in computeExtractCost()...

[Hans via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 06f3b0ed436b49caf667b19c95da51b9b9fb1b75
      https://github.com/llvm/llvm-project/commit/06f3b0ed436b49caf667b19c95da51b9b9fb1b75
  Author: Hans Wennborg <hans at chromium.org>
  Date:   2023-09-29 (Fri, 29 Sep 2023)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/AMDGPU/add_sub_sat-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/AMDGPU/add_sub_sat.ll
    M llvm/test/Transforms/SLPVectorizer/AMDGPU/crash_extract_subvector_cost.ll
    M llvm/test/Transforms/SLPVectorizer/AMDGPU/phi-result-use-order.ll
    M llvm/test/Transforms/SLPVectorizer/RISCV/math-function.ll
    M llvm/test/Transforms/SLPVectorizer/X86/alternate-calls-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/alternate-calls.ll
    M llvm/test/Transforms/SLPVectorizer/X86/crash_clear_undefs.ll
    M llvm/test/Transforms/SLPVectorizer/X86/hadd-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/hadd.ll
    M llvm/test/Transforms/SLPVectorizer/X86/hsub-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/hsub.ll
    M llvm/test/Transforms/SLPVectorizer/X86/reduction-transpose.ll

  Log Message:
  -----------
  Revert "[SLP]Improve costs in computeExtractCost() to avoid crash after D158449."

This caused asserts:

  Assertion failed: NumElts > 1 && "Expected at least 2-element fixed length vector(s).",
  file C:\b\s\w\ir\cache\builder\src\third_party\llvm\llvm\lib\Transforms\Vectorize\SLPVectorizer.cpp, line 7096

see comment on https://github.com/llvm/llvm-project/commit/59a67ea35d608480257fc64ec3e5106ef50de740

> Need to consider the length of the original vector for extractelements,
> not the length, matched number of the scalars. It fixes 2 issues: 1)
> improves cost estimation; 2) Fixes crashes after D158449.

This reverts commit 59a67ea35d608480257fc64ec3e5106ef50de740.