pmsjt wrote:

https://learn.microsoft.com/en-us/cpp/build/exception-handling-x64?view=msvc-170#chained-unwind-info-structures

I don't know what an "atend" is, but what you are describing doesn't seem to be 
a possible solution. Epilogs must be present in the main function entry. Only 
the main function entry can contain unwind opcodes which make changes to the 
stack pointer and return (or tail-call). Fragments can save and restore 
registers with mov but not push/pop. Think of fragments as extensions of the 
body, which can save and restore aditional registers, but they won't have 
prologs or epilogs of their own.

https://github.com/llvm/llvm-project/pull/129142
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