ritter-x2a wrote:

> This sounds sketchy to me. Is it really valid to enter a second call inside 
> another call's CALLSEQ markers, but only if we avoid adding a second nested 
> set of markers? It feels like attacking the symptom of the issue, but not the 
> root cause. (I'm not certain it's _not_ valid, but it just seems really 
> suspicious...)

>From what I've gathered from the source comments and the 
>[patch](https://github.com/llvm/llvm-project/commit/228978c0dcfc9a9793f3dc8a69f42471192223bc)
> introducing the code that inserts these CALLSEQ markers for TLSADDRs, their 
>only point here is to stop shrink-wrapping from moving the function 
>prologue/epilogue past the call to get the TLS address. This should also be 
>given when the TLSADDR is in another CALLSEQ.

I am however by no means an expert on this topic; I'd appreciate more insights 
on which uses of CALLSEQ markers are and are not valid (besides the 
MachineVerifier checks).

https://github.com/llvm/llvm-project/pull/106965
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