How to tell whether CPU supports x64?

John Levine johnl at
Fri Mar 18 04:23:30 UTC 2011

>> yes that is correct, LM stands for Long Mode which indicates amd64 support.
>> If your CPU doesn't list it, it's either a 32 bit only CPU, or it's a bug.
>. . . or maybe it is a 64 bit CPU that is not x86_64/amd64 compatible.
>Do IA-64 (Itanium), IBM POWER, and SPARC 64 bit processors use the same
>Long Mode functionality?

This processor is currently running IA32 code.  If you know any
dual mode IA32/SPARC chips, I'd be most interested to hear about them.


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