[all-commits] [llvm/llvm-project] 20b386: [LoopUtils] Fix neutral value for vector.reduce.fadd

[Nikita Popov via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 20b386aae07fc6e9db6fc1e58a56c8ff080e4352
      https://github.com/llvm/llvm-project/commit/20b386aae07fc6e9db6fc1e58a56c8ff080e4352
  Author: Nikita Popov <nikita.ppv at gmail.com>
  Date:   2020-10-29 (Thu, 29 Oct 2020)

  Changed paths:
    M llvm/lib/Transforms/Utils/LoopUtils.cpp
    M llvm/test/Transforms/LoopVectorize/ARM/mve-reduction-predselect.ll
    M llvm/test/Transforms/LoopVectorize/ARM/mve-reduction-types.ll
    M llvm/test/Transforms/LoopVectorize/X86/imprecise-through-phis.ll
    M llvm/test/Transforms/LoopVectorize/X86/reduction-fastmath.ll
    M llvm/test/Transforms/LoopVectorize/reduction-inloop-pred.ll
    M llvm/test/Transforms/LoopVectorize/reduction-inloop.ll
    M llvm/test/Transforms/LoopVectorize/reduction-predselect.ll
    M llvm/test/Transforms/PhaseOrdering/X86/vector-reductions-expanded.ll
    M llvm/test/Transforms/PhaseOrdering/X86/vector-reductions.ll
    M llvm/test/Transforms/SLPVectorizer/X86/horizontal-list.ll
    M llvm/test/Transforms/SLPVectorizer/X86/horizontal.ll
    M llvm/test/Transforms/SLPVectorizer/X86/reverse_extract_elements.ll

  Log Message:
  -----------
  [LoopUtils] Fix neutral value for vector.reduce.fadd

Use -0.0 instead of 0.0 as the start value. The previous use of 0.0
was fine for all existing uses of this function though, as it is
always generated with fast flags right now, and thus nsz.