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由 Rich Felker 提交于
n32 and n64 ABIs add new argument registers vs o32, so that passing on the stack is not necessary, so it's not clear why the 5- and 6-argument versions were special-cased to begin with; it seems to have been pattern-copying from arch/mips (o32). i've treated the new argument registers like the first 4 in terms of clobber status (non-clobbered). hopefully this is correct.
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