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  1. JDK
  2. JDK-8258932

AArch64: Enhance floating-point Min/MaxReductionV with fminp/fmaxp

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 17
    • 17
    • hotspot
    • b05
    • aarch64
    • linux

    Description

      In aarch64, current implemention of floating-point Min/MaxReductionV with 2 elements can be optimized via fminp/fmaxp instructions.

      Take `Set dst (MaxReductionV dsrc vsrc)` as an example:
      ---------- now ---------
      fmaxs $dst, $dsrc, $vsrc
      ins $tmp, S, $vsrc, 0, 1
      fmaxs $dst, $dst, $tmp
      -------- optimized -----
      fmaxp $dst, $vsrc, D
      fmaxs $dst, $dst, $dsrc

      Witnessed about 25% improvements with an intitial implementation on an A72-based aarch64 server.

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              dongbo Dong Bo
              dongbo Dong Bo
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                Updated:
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