参考文献4 MIPS平台下，是否存在多返回值的函数

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https://stackoverflow.com/questions/19204430/when-do-we-need-v1-in-mips/24230036#24230036

https://stackoverflow.com/questions/20131986/why-mips-assembler-has-more-that-one-register-for-return-value

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