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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“よく生きたねと褒めてもらえるよう”娘がつづる15年目の思い。关于这个话题，谷歌提供了深入分析
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