Encoding PHSUBSW with VEX.256

[PFaut2]

Hi,

I don't understand how to encode PHSUBSW with VEX.256. According to the documentation, VEX.L must be 0, otherwise the instruction will #UD. I thought we must use VEX.L = 1 to force the VEX.256.

Thanks,

[David_V_Intel]

Hello PFaut2,

Thank you for posting on the Intel ® communities.

In order to get the best assistance I would recommend posting your inquiry in the Intel ® Developer Zone forums, refer to the link below: 

https://software.intel.com/en-us/home

Regards,

David V

Intel Customer Support Technician

Under Contract to Intel Corporation