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Annotation of coherent/b/lib/libc/string/i386/memcpy.s, revision 1.1.1.1

1.1       root        1: //////////
                      2: / libc/string/i386/memcpy.s
                      3: / i386 C string library.
                      4: / ANSI 4.11.2.1.
                      5: //////////
                      6: 
                      7: //////////
                      8: / void *
                      9: / memcpy(void *To, void *From, size_t Count)
                     10: /
                     11: / Copy Count bytes from From to To, return To.
                     12: / Copies first by dwords, then by words, then by bytes, for efficiency;
                     13: / does not try to align the arguments.
                     14: //////////
                     15: 
                     16: To     .equ    12
                     17: From   .equ    To+4
                     18: Count  .equ    From+4
                     19: 
                     20:        .globl  memcpy
                     21:        .globl  _memcpy
                     22: 
                     23: memcpy:
                     24:        push    %esi
                     25:        push    %edi
                     26: 
                     27:        movl    %esi, From(%esp)        / From to ESI
                     28:        movl    %edi, To(%esp)          / To to EDI
                     29:        movl    %ecx, Count(%esp)       / Count to ECX
                     30:        movl    %eax, %edi              / Return value to EAX
                     31: 
                     32: _memcpy:                               / memmove() entry point
                     33:        cld
                     34:        movl    %edx, %ecx              / Save Count in EDX
                     35:        shrl    %ecx, $2                / Count/4
                     36:        rep
                     37:        movsl                           / move Count/4 dwords
                     38:        jnc     ?byte                   / CF contains Count bit 1 from shrl above
                     39:        movsw                           / move a word
                     40: 
                     41: ?byte:
                     42:        shrl    %edx, $1
                     43:        jnc     ?done
                     44:        movsb                           / move a byte
                     45: 
                     46: ?done:
                     47:        pop     %edi
                     48:        pop     %esi
                     49:        ret
                     50: 
                     51: / end of libc/string/i386/memcpy.s

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