DavidSpickett wrote:
I've taken the liberty of repeating the fact that the required APIs are not in
a publicly available OS release, at the top of the PR description.
Since we had someone on Discord try this and they could not read the registers.
Might save a few enthusiasts some time if they see that note first.
The good thing is that lldb didn't break:
```
Process 24700 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = instruction step
over
frame #0: 0x0000000100003f90 sme`main at main.c:13:5
10 int main(void) {
11 __asm("smstart");
12 __asm("ptrue p0.b");
13 __asm("fmla z0.s, p0/m, z30.s, z31.s");
-> 14 __asm("smopa za0.s, p0/m, p0/m, z30.b, z30.b");
15 __asm("luti2 z5.h, zt0, z0[2]");
16 __asm("smstop");
[...]
# register read -a
Scalable Matrix Extension Registers:
4 registers were unavailable.
```
I think that's exactly what should be happening on an unsupported OS version.
https://github.com/llvm/llvm-project/pull/119171
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