On: The Pocket Handbook of Image Processing Algorithms in C (1993) [pdf]

[NAFV_P]

> Do note that modern compilers can detect when the return value of the ++ operator is unused, and skip the extra steps when unneeded.

Is there an equivalent instruction in assembly for postfix increment/decrement?

[wtracy → NAFV_P]

Neither one really has a direct "equivalent" in assembly.

Prefix is going to look something like:

  inc eax # increment the value
  mov eax,ecx # copy the return value to its destination

Postfix is going to look something like:

  mov eax,ebx # copy original value
  inc eax # increment value
  mov ebx,ecx # copy original value to final destination

The actual code you'd get would vary a lot between compilers, architectures, and even just different contexts within the same compiler-architecture combination.

[NAFV_P → wtracy]

Thank you, dammit I really should learn assembly.