Do we need branch prediction?

By: anon2 (anon.delete@this.anon.com), August 25, 2022 9:08 pm
Room: Moderated Discussions
Anon4 (anon.delete@this.example.com) on August 25, 2022 11:45 am wrote:
> Brendan (btrotter.delete@this.gmail.com) on August 25, 2022 7:54 am wrote:
> > Is it possible for a good and useful program to exist without at least one branch?
>
> It depends on how you define branch. On a completely predicated architecture
> like 32 bit ARM it's possible to do if-conversion to turn branches in to predicated
> execution then effectively unroll and in-line everything else.
>
> I was once involved with a piece of avionics software running as part of a 3 way voting system
> and one of the implementations did exactly the above ran for 30 million instructions out of
> reset with no branches to produce the output then reset the processor to run again.

Branch by pulling the reset line! That's cool.
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TopicPosted ByDate
Do we need branch prediction?Kara2022/08/24 02:07 PM
  Do we need branch prediction?Rayla2022/08/24 03:04 PM
  Do we need branch prediction?Mark Roulo2022/08/24 04:25 PM
    Do we need branch prediction?Paul A. Clayton2022/08/24 06:28 PM
      Do we need branch prediction?Anon2022/08/24 06:52 PM
    Do we need branch prediction?rwessel2022/08/24 06:40 PM
    Do we need branch prediction?ananon2022/08/25 12:56 AM
      Do we need branch prediction?Carlie Coats2022/08/25 07:39 AM
        OT: You wanted rather than Mark Roulo2022/08/25 09:57 AM
          OT: You wanted "pre" rather than "code" rather than Mark Roulo2022/08/25 09:57 AM
            OT: You wanted "pre" rather than "code" rather than Carlie Coats2022/08/25 11:43 AM
    Do we need branch prediction?Kevin G2022/08/25 08:47 AM
      Do we need branch prediction?rwessel2022/08/25 11:10 AM
          Do we need branch prediction?rwessel2022/08/26 10:37 AM
  Do we need branch prediction?Geoff Langdale2022/08/24 07:18 PM
  Do we need branch prediction?Adrian2022/08/25 12:58 AM
  Do we need branch prediction?Brendan2022/08/25 07:54 AM
    Do we need branch prediction?Anon42022/08/25 11:45 AM
      Do we need branch prediction?anon22022/08/25 09:08 PM
  Predicable branching patterns (aykm; )Kara2022/08/27 01:00 PM
    Predicable branching patterns (aykm; )Jukka Larja2022/08/27 11:38 PM
    Predicable branching patterns (aykm; )Eric Fink2022/08/28 01:22 AM
      Predicable branching patterns (aykm; )Doug S2022/08/28 10:17 AM
    Predicable branching patterns (aykm; )---2022/08/28 02:16 PM
      Predicable branching patterns (aykm; )Anon2022/08/28 02:35 PM
  Q: Do we need branch prediction? A: We don't need it, but....βš›2022/08/29 02:17 PM
    Quantum stuff.Kara2022/08/29 03:01 PM
      Q: Do we need branch prediction? A: We don't need it, but....βš›2022/08/30 11:48 AM
    "Quantum Woo" (hint; that's NOT how it works) (NT)anonymous22022/08/29 04:19 PM
      Q: Do we need branch prediction? A: We don't need it, but....βš›2022/08/30 12:14 PM
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