In the C language program development, often you need to be N bytes copied from the source memory to the target memory segment segment pSrc pDest. Some programmers ordinary little history will call the C language standard library functions memcpy () or memmove (), after all, a majority of programmers calling these two library function implementation requires.
Why not assign one by memcpy () fast?
C programmers are willing to think of, when you call the memcpy () function to realize memory copy, they tend to think about implementation memcpy () function. In some programmers opinion, memcpy () that is nothing more than the following one by one as many copies of:
int i;for(i=0; i<N; i++)
*pDest++ = *pSrc++;
Considering the memcpy () function can accept the source and target memory segment pointer memory segment pointer just examples, the C language that is topography memcpy () function to draw the source and target memory segment pointer memory segment pointers are pointers void *, It is probably more step pointer paradigm shift:
Here is converted to unsigned char * pointer only by way of example only, of course, the reader can convert it for the rest of paradigm pointer.
C programmers willing hands to achieve a certain test I had my memcpy () function, if readers have tested my realization, we can discover performance testing, subject to the above implementation is not memcpy () library function subject to high, this is why it?
memcpy () function applied art
Since the by-byte copy of the assignment my_memcpy () obey not as memcpy () function, spicy it memcpy () function must use a certain skill, after all, what skills it?
my_memcpy previously described () implementation is drawn to convert char * pointer to a pointer of the copy-by-byte. However memcpy () function is not applied general byte pointer, but the word pointer applied.
Read my previous article, the reader should be clear, CPU upon the disposition of the data, if the data is properly aligned according to the data bus width, it spicy CPU talent very large data subject to sanctions.
In fact, the memcpy () function is usually implemented SIMD instructions written in the application, which makes it possible to manipulate a 128-bit data. For SIMD instructions, we have the opportunity to talk about. Just know that today's readers, data memcpy () function first 16 bytes can be copied on it, more than one copy only 1 byte of data subject to much higher.
Improved my_memcpy () function, promotion subject to bias
C language programmers in real copy of the data, to copy the data length is not necessarily an integral multiple of 16 bytes, is achieved memcpy () implementation than my_memcpy () is much more complex.
The first improvement my_memcpy () are aligned in accordance with the data to be copied native word width (32-bit machine is 4 bytes ordinary, common 64-bit machine is 8 bytes) at the memory, and the application of the word instead of the pointer bytes copy of the data pointer, associated with the following C code:
Source memory segment memory pointer or target pointer is precisely aligned segments to perform different mechanical manipulation general different architectures. For example, on an XScale punishment, by aligning the target memory segment pointer, in reality the performance test, I get a higher memory copy obedience.
To further enhance the memory copy of the subject, some of the C language code in the cycle may be open, to facilitate the progress of the CPU cache hit rate. But to bring this approach to obey promotion will vary depending on system architecture is different, due to the CPU load and store data in a different way to give it.
For alternative promotion subject, i.e., CPU load and store instructions written manually to grasp the data throughput. However, this method requires implemented by assembler instructions, C language being not achieve fine brilliant manipulation as promised.
summary
Easily seen in the C language program development, a simple memory copy is not simple, we have to match and more room for optimization. One soul C language program that is subject to high, and is very foundation of manipulating C language itself provides, it is a programming language designed to match the face, as a C programmers, we design a method , you should always make it clear how talent to write more efficient program.
Welcome to talk about the way in criticizing area suspected. Hand articles are original, very plain language description C every day, linux and other embedded development, porridge my article will focus on a wave of it, you can see a very new and updated previous article oh.
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