Talk:Intel64-haswell

Should the CPU_FLAGS suggested on this page include "lzcnt"? As listed here [1] lzcnt was adopted in Intel Haswell.

Or is there a special reason that LZCNT was not listed on this page?

[1] http://www.funtoo.org/CPU_FLAGS


LZCNT is indeed listed on the CPU_FLAGS page.

--Drobbins (talk) 22:55, May 9, 2015 (UTC)


LZCNT is not listed within the flags of the XEON E5-2660 of the server, that i rent

# cat /proc/cpuinfo | head -n5
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 63
model name	: Intel(R) Xeon(R) CPU E5-2660 v3 @ 2.60GHz
# cat /proc/cpuinfo | grep LZCNT | wc -l
0

I'm not sure if that information is absolutely reliable, since this is a QEMU based VPS and i don't know if the guest has full access to all the host CPU instructions. When i asked the provider about that, he answered "You have access to all instructions except for hyperthreading".

I hope, that helps a bit however.
--schentuu (talk) 18:25, May 18, 2015 (UTC)