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Intel® Extended Memory 64 Technology Software Developer's Guide

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Compatibility Mode ExceptionsSame as protected mode exceptions.<strong>64</strong>-Bit Mode Exceptions#SS(0)If a memory address referencing the SS segment is in a non-canonical form.#GP(0)If the memory address is in a non-canonical form.If memory operand for CMPXCHG16B is not aligned on a 16-byte boundary.If CPUID feature flag CMPXCHG16B is 0.#UDIf the destination operand is not a memory location.#PF(fault-code) If a page fault occurs.#AC(0)If alignment checking is enabled and an unaligned memory reference is made while thecurrent privilege level is 3.2-84 Vol. 1

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