Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1861

UNPCKHPS: Unpack High Packed Single-FP Data (Continued)
Additional Itanium System Environment Exceptions
Itanium Reg Faults
Itanium Mem Faults VHPT Data Fault, Data TLB Fault, Alternate Data TLB Fault, Data
When unpacking from a memory operand, an implementation may decide to fetch only
Comments:
the appropriate 64 bits. Alignment to 16-byte boundary and normal segment checking
will still be enforced.
The usage of Repeat Prefixes (F2H, F3H) with UNPCKHPS is reserved. Different
processor implementations may handle this prefix differently. Usage of this prefix with
UNPCKHPS risks incompatibility with future processors.
Volume 4: IA-32 SSE Instruction Reference
Disabled FP Register Fault if PSR.dfl is 1, NaT Register
Consumption Fault
Page Not Present Fault, Data NaT Page Consumption Abort, Data
Key Miss Fault, Data Key Permission Fault, Data Access Rights
Fault, Data Access Bit Fault
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