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Vol. 2A 3-173
INSTRUCTION SET REFERENCE, A-M
CPUID—CPU Identification
Table 3-15. Feature Information Returned in the ECX Register
Bit # Mnemonic Description
0 SSE3 Streaming SIMD Extensions 3 (SSE3). A value of 1 indicates the
processor supports this technology.
1-2 Reserved Reserved
3 MONITOR MONITOR/MWAIT. A value of 1 indicates the processor supports
this feature.
4 DS-CPL CPL Qualified Debug Store. A value of 1 indicates the processor
supports the extensions to the Debug Store feature to allow for
branch message storage qualified by CPL.
5 VMX Virtual Machine Extensions. A value of 1 indicates that the
processor supports this technology
6 SMX Safer Mode Extensions. A value of 1 indicates that the processor
supports this technology. See Chapter 6, “Procedure Calls,
Interrupts, and Exceptions”.
7 EST Enhanced Intel SpeedStep® technology. A value of 1 indicates that
the processor supports this technology.
8 TM2 Thermal Monitor 2. A value of 1 indicates whether the processor
supports this technology.
9 SSSE3 A value of 1 indicates the presence of the Supplemental
Streaming SIMD Extensions 3 (SSSE3). A value of 0 indicates the
instruction extensions are not present in the processor
10 CNXT-ID L1 Context ID. A value of 1 indicates the L1 data cache mode can
be set to either adaptive mode or shared mode. A value of 0
indicates this feature is not supported. See definition of the
IA32_MISC_ENABLE MSR Bit 24 (L1 Data Cache Context Mode) for
details.
11-12 Reserved Reserved
13 CMPXCHG16B CMPXCHG16B Available. A value of 1 indicates that the feature is
available. See the “CMPXCHG8B/CMPXCHG16B—Compare and
Exchange Bytes” section in this chapter for a description.
14 xTPR Update
Control
xTPR Update Control. A value of 1 indicates that the processor
supports changing IA32_MISC_ENABLES[bit 23].
15 PDCM Perfmon and Debug Capability: A value of 1 indicates the
processor supports the performance and debug feature indication
MSR IA32_PERF_CAPABILITIES.
18 - 16 Reserved Reserved
19 SSE4.1 A value of 1 indicates that the processor supports SSE4.1.
20 SSE4.2 A value of 1 indicates that the processor supports SSE4.2.