Norman Vine writes:
> Of course please feel free to consider this just another of my 'rants' on
> 'the basic tenant of realtime programing'
I agree that we need to keep speed in our sights, but let's put this
in context. Here's a little program that I just wrote:
#include <iostream>
int
main ()
{
int x = 3;
for (int i = 0; i < 1000000000; i++) {
if ((x & 1) == 0)
;
}
}
This runs 1 billion conditional tests. Actually it runs 2 billion
because of the conditional test in the loop, and it also increments
the i variable 1 billion times and performs a bitwise AND 1 billion
times. Here are the results of an execution run:
david@notebook:/tmp$ time ./conditionaltest
real 0m2.308s
user 0m2.240s
sys 0m0.040s
That's 2.24 seconds user execution time for all four operations 1
billion times on my little notebook. A computer with video card
running at 100 frames per second would have time for a little over 4
million of these tests between each frame; I doubt that we'll have
more than a few dozen property accesses per frame.
All the best,
David
--
David Megginson
[EMAIL PROTECTED]
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