Computer Hardware User's Manual

3-278 Vol. 2A DIVSS—Divide Scalar Single-Precision Floating-Point Values

INSTRUCTION SET REFERENCE, A-M

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.

Real-Address Mode Exceptions

GP(0) If any part of the operand lies outside the effective address

space from 0 to FFFFH.

#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.

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-