[Dev-C++] Optimization

[<or...@vp...>]

Hi!

Per Westermark wrote:

> clock returns amount of time consumed by your process. Obviously the fi=
rst
> call to clock() should be zero since your program hasn't done anything
> yet.
>=20
> When you write empty for() loops - without any actual work in them - th=
e
> compiler optimization will completely remove your loop. The result is t=
hat
> your second call to clock() will be made immediately after the first ca=
ll,
> and give the value zero.

This is a very interesting question, that I have been pondering on for so=
me time now: what=20
can you assume, that is NOT going to be removed by compiler optimization?=
 This also arises=20
a serious security issue: if you say "clear this block of memory" but the=
n you exit (or=20
similar), and actually never use that memory, will the compiler optimize =
out the call, or=20
let it work?

I would like to get some thoughts about this.
Thanks.

--
Greetings,
   Bal=E1zs