[HN Gopher] Coding Neon Kernels for the Cortex-A53
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       Coding Neon Kernels for the Cortex-A53
        
       Author : yeko
       Score  : 17 points
       Date   : 2025-04-21 15:34 UTC (7 hours ago)
        
 (HTM) web link (destevez.net)
 (TXT) w3m dump (destevez.net)
        
       | dmitrygr wrote:
       | A53 is not a great core, and seemingly no compiler targets it
       | well. Back at el goog, ChromeOS team had an intern who used a
       | cycle-accurate model of it to find that android's AOT compiler
       | produced shit code for it when multiplies were involved. A small
       | patch to the AOT compiler produced measurable perf improvement in
       | most android workloads on A53, costing no perf on A57/A72. This
       | patch was, of course, not shipped (politics).
        
         | BoingBoomTschak wrote:
         | Could you expand on the "politics" part? I can't imagine the
         | reason why. I mean, if you had said "suits thought this wasn't
         | business relevant" or something, I'd have believed it.
        
           | dmitrygr wrote:
           | The intern was in the ChromeOS team, the fix would have
           | needed to go into android. Those two teams were always in a
           | bit of "stay in your lane, buddy" relationship.
        
             | saagarjha wrote:
             | I continue to maintain that Google should adopt negative
             | peer bonuses
        
               | mtklein wrote:
               | "The peer malus" - Frederic Beal
        
               | gessha wrote:
               | And that will result increased tension between the teams
               | "downvoting each other".
               | 
               | Maybe this way Google will truly become a Microsoft-type
               | of company.
        
             | jjmarr wrote:
             | I thought the fabled monorepo was supposed to prevent this?
        
               | nullpoint420 wrote:
               | IIRC, both Android and Chrome(OS) upstream are not in the
               | google3 monorepo.
        
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       (page generated 2025-04-21 23:02 UTC)