[all-commits] [llvm/llvm-project] 7704c5: [RISCV] Use positive 0.0 for the neutral element i...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7704c503ecb8b20574fa8a8dc45dd8545216c450
      https://github.com/llvm/llvm-project/commit/7704c503ecb8b20574fa8a8dc45dd8545216c450
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2021-12-23 (Thu, 23 Dec 2021)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-fp.ll
    M llvm/test/CodeGen/RISCV/rvv/vreductions-fp-sdnode.ll

  Log Message:
  -----------
  [RISCV] Use positive 0.0 for the neutral element in fadd reductions if nsz is present.

-0.0 requires a constant pool. +0.0 can be made with vmv.v.x x0.

Not doing this in getNeutralElement for fear of changing other targets.

Differential Revision: https://reviews.llvm.org/D115978