内存拷贝函数 memcpy

void* __cdecl memcpy(void* dst,const void* src,size_t count)
{
    void*ret=dst;
　　#if defined(_M_MRX000)||defined(_M_ALPHA)||defined(_M_PPC)
　　{
   　　  extern void RtlMoveMemory(void *,const void *,size_t count);
    　　 RtlMoveMemory(dst,src,count);
　　}
　　#else /*defined(_M_MRX000)||defined(_M_ALPHA)||defined(_M_PPC)*/
　　/*
　　*copy from lower addresses to higher addresses
　　*/
　　while(count--){
  　　  *(char *)dst = *(char *)src;
   　　 dst = (char *)dst+1;
   　　 src = (char *)src+1;
　　}
　　#endif  /*defined(_M_MRX000)||defined(_M_ALPHA)||defined(_M_PPC)*/
　　return (ret);
}

void *memcpy(void *to,const void *from,size_t n)
{@H_944_111@　　 //记录拷贝目的位置，为了返回拷贝内容的首地址
    void *xto = to;
    size_t temp,temp1;
 　@H_944_111@　　 //判断拷贝的字节数
    if (!n)
        return xto;@H_944_111@　　 //
    if ((long)to & 1) {
        char *cto = to;
        const char *cfrom = from;
        *cto++ = *cfrom++;
        to = cto;
        from = cfrom;
        n--;
    }
    if (n > 2 && (long)to & 2) {
        short *sto = to;
        const short *sfrom = from;
        *sto++ = *sfrom++;
        to = sto;
        from = sfrom;
        n -= 2;
    }
    temp = n >> 2;
    if (temp) {
        long *lto = to;
        const long *lfrom = from;
　　#if defined(CONfig_M68000) || defined(CONfig_COLDFIRE)
        for (; temp; temp--)
            *lto++ = *lfrom++;
　　#else
        asm volatile (
            @H_944_227@"@H_944_227@    movel %2,%3\n@H_944_227@"
            @H_944_227@"@H_944_227@    andw  #7,%3\n@H_944_227@"
            @H_944_227@"@H_944_227@    lsrl  #3,%2\n@H_944_227@"
            @H_944_227@"@H_944_227@    negw  %3\n@H_944_227@"
            @H_944_227@"@H_944_227@    jmp   %%[email protected](1f,%3:w:2)\n@H_944_227@"
            @H_944_227@"@H_944_227@4:    movel %@L_772_7@+,%[email protected]+\n@H_944_227@"
            @H_944_227@"@H_944_227@    movel %[email protected]+,%[email protected]+\n@H_944_227@"
            @H_944_227@"@H_944_227@    movel %[email protected]+,%[email protected]+\n@H_944_227@"
            @H_944_227@"@H_944_227@    movel %[email protected]+,%[email protected]+\n@H_944_227@"
            @H_944_227@"@H_944_227@    movel %[email protected]+,%[email protected]+\n@H_944_227@"
            @H_944_227@"@H_944_227@    movel %[email protected]+,%@L_404_12@+\n@H_944_227@"
            @H_944_227@"@H_944_227@    movel %[email protected]+,%[email protected]+\n@H_944_227@"
            @H_944_227@"@H_944_227@    movel %[email protected]+,%[email protected]+\n@H_944_227@"
            @H_944_227@"@H_944_227@1:    dbra  %2,4b\n@H_944_227@"
            @H_944_227@"@H_944_227@    clrw  %2\n@H_944_227@"
            @H_944_227@"@H_944_227@    subql #1,%2\n@H_944_227@"
            @H_944_227@"@H_944_227@    jpl   4b@H_944_227@"
            : @H_944_227@"@H_944_227@=a@H_944_227@" (lfrom),@H_944_227@"@H_944_227@=a@H_944_227@" (lto),@H_944_227@"@H_944_227@=d@H_944_227@" (temp),@H_944_227@"@H_944_227@=&d@H_944_227@" (temp1)
            : @H_944_227@"@H_944_227@0@H_944_227@" (lfrom),@H_944_227@"@H_944_227@1@H_944_227@" (lto),@H_944_227@"@H_944_227@2@H_944_227@" (temp));
　　#endif
        to = lto;
        from = lfrom;
   　　 }
   　　if (n & 2) {
        short *sto = to;
        const short *sfrom = from;
        *sto++ = *sfrom++;
        to = sto;
        from = sfrom;
    　　}
   　　 if (n & 1) {
       　　 char *cto = to;
       　　 const char *cfrom = from;
      　　  *cto = *cfrom;
  　　  }
    return xto;
}