AMD x86-64 Architecture Programmer's Manual, Volume 4, 128-Bit ...

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AMD64 Technology 26568—Rev. 3.05—September 2003 Related Instructions CMPPD, CMPPS, CMPSD, CMPSS, COMISD, COMISS, UCOMISD rFLAGS Affected ID VIP VIF AC VM RF NT IOPL OF DF IF TF SF ZF AF PF CF MXCSR Flags Affected Exceptions 386 UCOMISS 0 0 M 0 M M 21 20 19 18 17 16 14 13–12 11 10 9 8 7 6 4 2 0 Note: Bits 31–22, 15, 5, 3, and 1 are reserved. A flag set to 1 or cleared to 0 is M (modified). Unaffected flags are blank. If the instruction causes an unmasked SIMD floating-point exception (#XF), the rFLAGS bits are not updated. FZ RC PM UM OM ZM DM IM DAZ PE UE OE ZE DE IE M M 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Note: A flag that may be set to one or cleared to zero is M (modified). Unaffected flags are blank. Exception Real Invalid opcode, #UD X X X Virtual 8086 Protected Cause of Exception X X X X X X The SSE instructions are not supported, as indicated by bit 25 of CPUID standard function 1. The emulate bit (EM) of CR0 was set to 1. The operating-system FXSAVE/FXRSTOR support bit (OSFXSR) of CR4 was cleared to 0. X X X There was an unmasked SIMD floating-point exception while CR4.OSXMMEXCPT = 0. See SIMD Floating-Point Exceptions, below, for details. Device not available, #NM X X X The task-switch bit (TS) of CR0 was set to 1. Stack, #SS X X X A memory address exceeded the stack segment limit or was non-canonical.
26568—Rev. 3.05—September 2003 AMD64 Technology Exception Real General protection, #GP X X X Virtual 8086 Protected Cause of Exception A memory address exceeded a data segment limit or was non-canonical. X A null data segment was used to reference memory. Page fault, #PF X X A page fault resulted from the execution of the instruction. Alignment check, #AC X X An unaligned memory reference was performed while alignment checking was enabled. SIMD Floating-Point X X X There was an unmasked SIMD floating-point exception Exception, #XF while CR4.OSXMMEXCPT = 1. See SIMD Floating-Point Exceptions, below, for details. SIMD Floating-Point Exceptions Invalid-operation exception (IE) X X X A source operand was an SNaN value. Denormalized-operand exception (DE) X X X A source operand was a denormal value. UCOMISS 387
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