[QUOTE=Aillas;584958]. . .
I've update your program to run on Windows, optimize it a little (remove 2 loops, 1 nested, other), add running time log. The optimization is huge and very very insignificant at the same time. As you can seen in output below, for a total running time of 49 sec, the computation time is only 83 ms. It was previously of 2 sec. Compared to the downloading time....
. . .
I know it not the right forum to talk about alimerge. Where can I send you back the source code (if you are interested) ?

Thanks[/QUOTE]Wow! Yes, I'm quite interested in seeing your improvements. I hope I can understand them. Since the original was posted in [URL="https://www.mersenneforum.org/showthread.php?t=23612"]this tread[/URL] (post #794), could you post the updated source there?

Thanks much!

[QUOTE=Aillas;584958]2579248 (i4715) merged with 1561730 (i0)[/QUOTE]

It terminates at 11 (4747 steps)

[QUOTE=EdH;584963]Wow! Yes, I'm quite interested in seeing your improvements. I hope I can understand them. Since the original was posted in [URL="https://www.mersenneforum.org/showthread.php?t=23612"]this tread[/URL] (post #794), could you post the updated source there?

Thanks much![/QUOTE]

Done here: [URL="https://www.mersenneforum.org/showpost.php?p=584975&postcount=1291"]1291[/URL]