_cerrno.s - scc - simple c99 compiler
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       ---
       _cerrno.s (123B)
       ---
            1         .file        "_cerrno.s"
            2         .globl        _cerrno
            3 
            4 _cerrno:
            5         cmpq        $0,%rax
            6         js        1f
            7         retq
            8 
            9 1:        neg        %rax
           10         mov        %eax,(errno)
           11         mov        $-1,%eax
           12         retq