efriedma-quic wrote:

> I don't know much about there intrinsics on ARM, what are the stronger 
> guarantees?

The Arm specifies that there's a memory reservation, and you can write whatever 
operations you want as long as you don't break that reservation.  And the 
reservation is usually only a few bytes. RISC-V specifically only guarantees 
behavior for sequences of integer instructions.

https://github.com/llvm/llvm-project/pull/94578
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