asb wrote: Thanks James, that matches what I'd understood. Just one comment on this though:
> If Zaamo is present, but neither Zalrsc nor Zacas are present, I think > there's no way to implement a cmpxchg operation. This means lock-free atomics > cannot be supported, so it should `setMaxAtomicSizeInBitsSupported(0)`. Especially given that Zaamo is [documented](https://github.com/riscv/riscv-zaamo-zalrsc/blob/main/zaamo-zalrsc.adoc) as targeting embedded systems, emitting __sync calls for the non-AMO atomics (as would be done with +forced-atomics, presumably they'd be implemented by turning off interrupts) seems defensible doesn't it? Or is there a correctness issue with that I'm missing? https://github.com/llvm/llvm-project/pull/77424 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
