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static inline void * memcpy(void * dst, const void * src, size_t cnt)
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static inline void * memcpy(void * dst, const void * src, size_t cnt)
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{
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{
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    __u32 d0, d1, d2;
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    __u32 d0, d1, d2;
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    __asm__ __volatile__(
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    __asm__ __volatile__(
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        /* copy all full dwords */
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        "rep movsl\n\t"
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        "rep movsl\n\t"
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        /* load count again */
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        "movl %4, %%ecx\n\t"
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        "movl %4, %%ecx\n\t"
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        /* ecx = ecx mod 4 */
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        "andl $3, %%ecx\n\t"
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        "andl $3, %%ecx\n\t"
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        /* are there last <=3 bytes? */
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        "jz 1f\n\t"
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        "jz 1f\n\t"
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        /* copy last <=3 bytes */
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        "rep movsb\n\t"
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        "rep movsb\n\t"
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        /* exit from asm block */
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        "1:\n"
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        "1:\n"
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        : "=&c" (d0), "=&D" (d1), "=&S" (d2)
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        : "=&c" (d0), "=&D" (d1), "=&S" (d2)
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        : "0" (cnt / 4), "g" (cnt), "1" ((__u32) dst), "2" ((__u32) src)
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        : "0" (cnt / 4), "g" (cnt), "1" ((__u32) dst), "2" ((__u32) src)
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        : "memory");
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        : "memory");
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