often but not always, for example a function using asm() to access, say, some AES intrinsics is pure (const even) since the output only depends on input, but of

often but not always, for example a function using asm() to access, say, some AES intrinsics is pure (const even) since the output only depends on input, but oftentimes compiler by itself will not declare a function with an asm() block pure or const