The ABI says so. ABIs typically designate that called functions can freely modify only certain registers. Called functions have to save and restore the others. This is a trade-off to try to reduce unnecessary saving and reloading of data which is no longer needed.
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Певцов резко высказался об иностранных псевдонимах российских артистов14:12。业内人士推荐新收录的资料作为进阶阅读
View a PDF of the paper titled Unlocking Python's Cores: Hardware Usage and Energy Implications of Removing the GIL, by Jos\'e Daniel Montoya Salazar