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I'm new to AT&T assembly language. I read this from linux source code(kernel 2.4.0 include/asm_i386/string). [code=c] static inline void * __memcpy(void * to, const void * from, size_t n) { int d0, d1, d2; __asm__ __volatile__( "rep ; movsl\n\t" "testb $2,%b4\n\t" "je 1f\n\t" "movsw\n" "1:\ttestb $1,%b4\n\t" "je 2f\n\t" "movsb\n" "2:" … 
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