STINNER Victor added the comment:

"If revert c1a698edfa1b, the performance is returned to the level of 3.5."

Oh, so using "fastcall" makes partial_call() slower? That's really something 
bad :-/ It would be nice if you can confirm using all optimizations enabled 
(PGO+LTO): ./configure --with-optimizations.

For faster compilation and best performances, you might also try to modify 
PROFILE_TASK in to run your microbenchmark (but you need to run 
it long enough, so the compiler is able to detect hot code).


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