Fun with movsb and prefetch

#1 06-24-2005, 16:30

Instead of crossposting, I'll give a link to RCE forum (It's probably a known thing anyway)
woodmann.com/forum/showthread.php?t=7195

MaRKuS-DJM · #2 06-24-2005, 19:11

this means the processor is buggy?

SLV · #3 06-24-2005, 21:19

interesting... but will SEH handler rescue this code?

#4 06-25-2005, 01:01

ah, good old pre-fetch queue. It's been a while...
Now, here is small challenge: Write an assembly program to find out how long is the prefetch queue of your CPU! I used to give this as an exercise to my system-level programming students. Some of them could find the solution in just a few CPU cycles and some crashed like an old Pentium

#5 06-25-2005, 05:34

Quote:

Originally Posted by WARM3CH

ah, good old pre-fetch queue. It's been a while...
Now, here is small challenge: Write an assembly program to find out how long is the prefetch queue of your CPU! I used to give this as an exercise to my system-level programming students. Some of them could find the solution in just a few CPU cycles and some crashed like an old Pentium

Sorry for my terrible English. Why emphasize "old Pentium" ?
p.s. the prog running smoothly with Pentium 4 2.8G w/ HT