Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1820

LDMXCSR: Load SSE Control/Status (Continued)
Additional Itanium System Environment Exceptions
Itanium Reg Faults
Itanium Mem Faults VHPT Data Fault, Data TLB Fault, Alternate Data TLB Fault, Data
The usage of Repeat (F2H, F3H) and Operand Size (66H) prefixes with LDMXCSR is
Comments:
reserved. Different processor implementations may handle this prefix differently. Usage
of this prefix with LDMXCSR risks incompatibility with future processors.
4:518
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
Volume 4: IA-32 SSE Instruction Reference