On 06/28/2012 08:58 AM, Markus Armbruster wrote: >>> >>> Better code is an argument only if the effect can be demonstrated. >> >> I don't know even for which compilers or CPUs this is true so it's >> unlikely I could demonstrate it. However, googling finds a few >> articles in defense of this. > > Hearsay. Your honor, I rest my case :)
On x86_64, conversion from unsigned to unsigned long takes zero instructions, but conversion from int to long takes one instruction. So expressions like a[i] are one instruction shorter if the index is unsigned. unsigned is also slightly safer from a security perspective, since you only need to consider overflow, not underflow. I used to be an int fan but I have been converted. My fingers still prefer int though. -- error compiling committee.c: too many arguments to function
