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

1.1     ! root        1: //////////
        !             2: / libc/string/i386/memset.s
        !             3: / i386 C string library.
        !             4: / ANSI 4.11.6.1.
        !             5: //////////
        !             6: 
        !             7: //////////
        !             8: / void *
        !             9: / memset(void *String, int Char, size_t Count)
        !            10: /
        !            11: / Set Count bytes of String to Char.
        !            12: / Uses repeated dword copy for efficiency.
        !            13: //////////
        !            14: 
        !            15: String .equ    8
        !            16: Char   .equ    String+4
        !            17: Count  .equ    Char+4
        !            18: 
        !            19:        .data
        !            20: fourx: .long   0x01010101
        !            21: 
        !            22:        .text
        !            23:        .globl  memset
        !            24: 
        !            25: memset:
        !            26:        push    %edi
        !            27: 
        !            28:        movl    %ecx, Count(%esp)       / Count to ECX
        !            29:        movl    %edi, String(%esp)      / String address to EDI
        !            30:        movzxb  %eax, Char(%esp)        / Char to EAX
        !            31:        mull    %eax, fourx             / Char:Char:Char:Char in EAX
        !            32:        movl    %edx, %ecx              / Save Count in EDX
        !            33:        shrl    %ecx, $2                / Count/4
        !            34:        cld
        !            35:        rep
        !            36:        stosl                           / Copy Count/4 Char dwords to String
        !            37:        jnc     ?byte                   / CF contains Count bit 1 from shrl above
        !            38:        stosw                           / Copy a word
        !            39: 
        !            40: ?byte:
        !            41:        shrl    %edx, $1
        !            42:        jnc     ?done
        !            43:        stosb                           / Copy Char to String
        !            44: 
        !            45: ?done:
        !            46:        movl    %eax, String(%esp)      / Return the destination in EAX
        !            47: 
        !            48:        pop     %edi
        !            49:        ret
        !            50: 
        !            51: / end of libc/string/i386/memset.s

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