asb wrote:

> > I don't know if we need S-mode profile CPUs.
> 
> I lean towards not supporting them since the S extensions don't do anything 
> in the compiler except preprocessor defines and ELF attributes, but maybe we 
> should put it on the agenda for the sync meeting this week.

My initial feeling is it probably wouldn't hurt to have them, but it's not 
clear who would use them in practice. Build systems for userspace code 
presumably wouldn't do so, and I'd have thought kernels would typically want 
more control (as they wouldn't want the compiler to make use of floating point 
or vectors freely). But I could be wrong on that, so I'd love to hear from 
others with more experience on that. e.g. @petrhosek

https://github.com/llvm/llvm-project/pull/84877
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