C언어 alignment striction 관련해서 질문이 있습니다.

char, short로 되어 있어도 4바이트로(혹은 시스템에 따라 그에 맞는 길이로)

읽어서 1바이트 혹은 2바이트로 변환해서 돌려줍니다.

그래서 char, short로 구현시 int 구현 할 때 보다 더 느릴 수 있다고 배웠네요.

Different size integer types:

Typically, CPUs are fastest at operating on integers of their native word size (with some caveats about 64-bit systems). 32 bit operations are often faster than 8- or 16- bit operations on modern CPUs, but this varies quite a bit between architectures. Also, remember that you can't consider the speed of a CPU in isolation; it's part of a complex system. Even if operating on 16-bit numbers is 2x slower than operating on 32-bit numbers, you can fit twice as much data into the cache hierarchy when you represent it with 16-bit numbers instead of 32-bits. If that makes the difference between having all your data come from cache instead of taking frequent cache misses, then the faster memory access will trump the slower operation of the CPU.

(http://stackoverflow.com/questions/5069489/performance-of-built-in-types-char-vs-short-vs-int-vs-float-vs-double)