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Annotation of coherent/b/lib/libc/string/i386/memcmp.s, revision 1.1

1.1     ! root        1: //////////
        !             2: / libc/string/i386/memcmp.s
        !             3: / i386 C string library.
        !             4: / ANSI 4.11.4.1.
        !             5: //////////
        !             6: 
        !             7: //////////
        !             8: / int
        !             9: / memcmp(void *String1, void *String2, size_t Count)
        !            10: /
        !            11: / Compare Count bytes of String2 and String1.
        !            12: / Return -1 for <, 0 for ==, 1 for >.
        !            13: //////////
        !            14: 
        !            15: String1        .equ    12
        !            16: String2        .equ    String1+4
        !            17: Count  .equ    String2+4
        !            18: 
        !            19:        .globl  memcmp
        !            20: 
        !            21: memcmp:
        !            22:        push    %esi
        !            23:        push    %edi
        !            24: 
        !            25:        subl    %eax, %eax              / Result 0 to EAX, set ZF in case ECX==0
        !            26:        movl    %ecx, Count(%esp)       / Count to ECX
        !            27:        movl    %esi, String2(%esp)     / String2 address to ESI
        !            28:        movl    %edi, String1(%esp)     / String1 address to EDI
        !            29:        cld
        !            30:        repe
        !            31:        cmpsb
        !            32:        jz      ?done                   / String1 == String2, return 0
        !            33:        ja      ?less
        !            34:        incl    %eax                    / String1 > String2, return 1
        !            35:        jmp     ?done
        !            36: 
        !            37: ?less:
        !            38:        decl    %eax                    / String1 < String2, return -1
        !            39: 
        !            40: ?done:
        !            41:        pop     %edi
        !            42:        pop     %esi
        !            43:        ret
        !            44: 
        !            45: / end of libc/string/i386/memcmp.s

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