8
votes
3answers
1k views

What does the 'R' in x64 register names stand for?

I know the 32 bit registers were named like the 16 bit registers with an 'E' prefix to mean extended. I've always assumed that meant extended from 16 to 32 bits although I've never seen that ...
6
votes
3answers
1k views

What's so special about x64 and programming x86?

I know this is a little funny question, but I didn't have the chance to realize what makes any difference when programming x64 or x86 at high level languages (.NET for instance). Any explanations ...