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INSTRUCTION SET REFERENCE
ORPSBit-wise Logical OR for Single-FP Data (Continued)
Numeric Exceptions
None.
Protected Mode Exceptions
#GP(0)
For an illegal memory operand effective address in the CS, DS, ES, FS, or
GS segments.
#SS(0)
For an illegal address in the SS segment.
#PF(fault-code)For a page fault.
#UD
If CR0.EM = 1.
#NM
If TS bit in CR0 is set.
Real Address Mode Exceptions
Interrupt 13
If any part of the operand would lie outside of the effective address space
from 0 to 0FFFFH.
#UD
If CR0.EM = 1.
#NM
If TS bit in CR0 is set.
Virtual 8086 Mode Exceptions
Same exceptions as in Real Address Mode.
#PF(fault-code) For a page fault.
Comments
The usage of Repeat Prefix (F3H) with ORPS is reserved. Different processor implementations
may handle this prefix differently. Usage of this prefix with ORPS risks incompatibility with
future processors.
