Hi all,
I'd like to bring to your attention the following two equivalent snippet of
code:
*************** A ********************
event void Read.readDone(error_t result, val_t val) {
curr = val;
if (haveHistory && (pre - curr) > 0)) {
// do something
}
pre = curr;
haveHistory = TRUE;
}
*****************************************
*************** B ********************
event void Read.readDone(error_t result, val_t val) {
curr = val;
if (haveHistory && (pre - curr) > 0)) {
// do something
}
pre = curr;
if( ! haveHistory )
haveHistory = TRUE;
}
*****************************************
Given that A and B are semantically the same and hence the "if (
! haveHistory )" in B could be removed with no effect to the correctness,
let's suppose the readDone event fires quite often; my question is:
Is A more time and energy efficient than B?
I'm pretty sure the "if ( ! haveHistory )" statement takes more CPU cycles
than the simple "haveHistory = TRUE" assignement, so A should be definitely
quicker than B;
however, what about the energy consumed?!?
Thank you,
Raffaele
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