Sep 5, 2012 · Functions like strcpy() and particularly memcpy() on the other hand, are heavily optimized by the compiler, often implemented in inline assemble for maximum performance. Some measurements I once made on barebone 16-bit low-end microcontrollers are included below. I understand that memmove and memcpy difference is that memmove handles the memory overlap case. I have checked the implementation in libgcc and got this article [memcpy performance] from the intel website. In libgcc, the memmove is similar to memcpy, both just go though one byte and byte, so the performance should be almost same even after There can be many of them, or none. >> This brings the conclusion, that memcpy () and strcpy () are designed for. >> different jobs: strcpy () is for sequences of bytes of variable length (the. >> length of the sequence is determined by the position of the zero byte), also. >> known as strings; memcpy () is for blocks of data of known length 11 Years Ago. strcpy () uses '\0' as the stopping character while memcpy () requires you to specify how many bytes are being copied. memcpy () isn't guaranteed to be safe if the source and destination blocks overlap while memmove () does have that guarantee at the cost of performance. Due to the types involved, the mem* functions are also more Dec 28, 2010 · @Simone - libc writers have spend a lot of time making sure their memcpy implementations are efficient, and compiler writers have spent just as much time making their compilers look for cases when assignments could be made faster by memcpy and vice versa. Your argument of "it can be as bad as you want it to" as well as your out-of-the-blue Feb 25, 2011 · I'm attaching an EXAMPLE patch against the current glibc git tree: it just tries to get rid of the unnecessary differences between memcpy and memmove for the normal ssse3 case. The approach is simple: - small copies (less than 80 bytes) have hand-coded optimized code that gets called through a jump table. Rewrite strstr, strcpy, memcpy, memset, atof algorithm, Programmer All, we have been working hard to make a technical sharing website that all programmers love. Just curious to know (as we use these functions often). I don't see any practical difference between strncpy() and memcpy(). Isn't it worth to say that effectively, char* strncpy (char *dst, const Jul 11, 2012 · Copies bytes between buffers. More secure versions of these functions are available; see memcpy_s, wmemcpy_s. void *memcpy( void *dest, const void *src, size_t count ); wchar_t *wmemcpy( wchar_t *dest, const wchar_t *src, size_t count ); Parameters. dest New buffer. src Buffer to copy from. count Number of characters to copy. Return Value memcpy() function is used to copy a specified number of bytes from one memory to another. Whereas, strcpy() function is used to copy the contents of one string into another string. memcpy() function acts on memory rather than value. Whereas, strcpy() function acts on value rather than memory. 1NRs.