If I have an 64 bits processor, but use a 32 bits OS, how do operations on 64 bits integer perform?
- As fast as on a x64 OS.
- Faster than on x86/32bits but slower than x64/64bits.
- As fast as on x86/32bits.
- Something else?
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The same as with x86/32bits provided the other characteristics are matching. The 64bits General Purpose registers are not available in 32bit processor mode as well as new instructions.