Author: Ratko V Tomic
Date: 13:13:42 11/19/02
Go up one level in this thread
> Don't use if - else ;)
Actually, it often helps replacing 'if-else' with single 'if'
whenever at least one of the if/else blocks is very simple,
such as an assignement. For example:
if (a)
x=xa;
else
x=xb;
will work faster if changed to:
x=xb;
if (a)
x=xa;
Additionally, you would want to pick x=xb to be the less
frequent case of the two, so that most of the time the
x=xa would execute with no jump at all.
In any case, even when x=xa and x=xb have similar frequencies,
you end up with smaller code and fewer executed jumps (the 'if-else'
form executes 1 jump every time and has two encoded jumps,
while the 'if' form on average executes a jump half the time
or less, and it has a single encoded jump).
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