Intel 253666-024US Benutzerhandbuch

Vol. 2A 3-161

INSTRUCTION SET REFERENCE, A-M

COMISS—Compare Scalar Ordered Single-Precision Floating-Point Values and Set EFLAGS

Virtual-8086 Mode Exceptions

Same exceptions as in real address mode.
#PF(fault-code) 

For a page fault. 

#AC(0)

If alignment checking is enabled and an unaligned memory 

reference is made.

Compatibility Mode Exceptions

Same exceptions as in protected mode.

64-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.

#PF(fault-code) 

For a page fault.

#NM

If CR0.TS[bit 3] = 1. 

#XM 

If an unmasked SIMD floating-point exception and CR4.OSXM-

MEXCPT[bit 10] = 1. 

#UD 

If an unmasked SIMD floating-point exception and CR4.OSXM-

MEXCPT[bit 10] = 0.

If CR0.EM[bit 2] = 1.
If CR4.OSFXSR[bit 9] = 0.
If CPUID.01H:EDX.SSE[bit 25] = 0.
If the LOCK prefix is used.

#AC(0)

If alignment checking is enabled and an unaligned memory 

reference is made while the current privilege level is 3.