[PATCH] D99586: [AArch64] Default to zero-cycling-zeroing FP registers.

[Sjoerd Meijer via Phabricator via llvm-commits]

SjoerdMeijer created this revision.
SjoerdMeijer added reviewers: dmgreen, t.p.northover, fhahn, paquette, david-arm.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
SjoerdMeijer requested review of this revision.
Herald added a project: LLVM.

It is generally beneficial to prefer "movi v0, #0" over "fmov s0, wzr" because this avoids an int -> fp register transfer. Achieve this by defaulting zero-cycle-zeroing FP to true.


https://reviews.llvm.org/D99586

Files:
  llvm/lib/Target/AArch64/AArch64.td
  llvm/lib/Target/AArch64/AArch64Subtarget.h
  llvm/test/CodeGen/AArch64/arm64-fast-isel-materialize.ll
  llvm/test/CodeGen/AArch64/arm64-fp-contract-zero.ll
  llvm/test/CodeGen/AArch64/arm64-rev.ll
  llvm/test/CodeGen/AArch64/arm64-zero-cycle-zeroing.ll
  llvm/test/CodeGen/AArch64/f16-imm.ll
  llvm/test/CodeGen/AArch64/fptosi-sat-scalar.ll
  llvm/test/CodeGen/AArch64/fptosi-sat-vector.ll
  llvm/test/CodeGen/AArch64/fptoui-sat-scalar.ll
  llvm/test/CodeGen/AArch64/fptoui-sat-vector.ll
  llvm/test/CodeGen/AArch64/remat-float0.ll

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