3 ms·

Given all of this, what approach does RISC-V take? The RISC-V is presumably very 'greenfield' regarding its memory model, I imagine they've made their decision

Given all of this, what approach does RISC-V take? The RISC-V is presumably very 'greenfield' regarding its memory model, I imagine they've made their decision based on all this knowledge.

my123 6y ago
A weak memory model. See https://riscv.org/wp-content/uploads/2018/05/14.25-15.00-RISCVMemoryModelTutorial.pdf https://riscv.org/wp-content/uploads/2018/05/14.25-15.00-RIS... (by Dan Lustig at Nvidia, NV is both very involved in Arm and RISC-V).
- zozbot234 6y ago
  It has a weak memory model by default, but you can opt in to TSO (like x86) as an optional extension.
  - my123 6y ago
    And for Arm too, you can ship stronger memory models up to SC. There's also the RCpc extension for memory accesses w/ another memory model there.
    - jabl 6y ago
      Is RCpc still multi-copy atomic? (Which AFAIK is a guaranteed behavior of the Aarch64 memory model)
      - my123 6y ago
        No difference on that front, yep.