efriedma-quic wrote:
The key here is that `__arm_streaming_compatible` is the only way to write code
that runs in both streaming and non-streaming mode; outside of
`__arm_streaming_compatible`, there generally isn't an issue. If you know
you're not in streaming mode, you can just check directly for SVE/SVE2, and if
you know you're in streaming mode, you can check directly for SME/SME2.
Thinking about it a bit more, maybe we can just do some magic to make things
work? Say, if you specify `__attribute__((target("sve")))
__arm_streaming_compatible`, and the caller is in streaming mode, allow the
call even if the caller doesn't have SVE proper.
https://github.com/llvm/llvm-project/pull/92427
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