On Wednesday, 10 November 2021 at 06:47:32 UTC, forkit wrote:
btw. My pc has 24GB of main memory, and my CPU 8MB L3 cache. So I really don't give a damn about allocations .. not one little bit ;-)
That's not the point. The point is the program is doing unnecessary non-trivial work while introducing additional failure paths. It certainly has ways to go to reach Ali's AA solution, but still...
To put things in perspective, the algorithm can easily complete before malloc even returns (heck, before it even starts executing). There's what, 11 cmovs at most? It would take several dozen instructions, a couple of loops and a few other branches just to find malloc when you first call it. Not to mention it itself making that syscall and setting up its bins...
And I'm not even talking about optimization. Just, uh, non-pessimization.
