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Re: Question about sibling call epilogues & registers

On 10/16/2016 05:27 PM, Segher Boessenkool wrote:



Oddly enough, I had forgotten to call add_function_usage_to() on my save
stub (which I didn't post), but not the restore stub. So thanks for that
psychic intervention. :) But if you look carefully, it's there, although
it's hard to read because of all the line wrapping:

     (expr_list (use (reg:DI 4 si))
         (nil)))

But shouldn't it be marked as using RCX as well?



So the bright side is that I'm learning a lot more about
gcc internals! Which is probably my main goal of this exercise.

:-)


Segher
Hehe, well no, it's the sibcall to LeaveCriticalSection that needs RCX. My stub isn't reading or touching it. 

Daniel
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