C# Signature:

[DllImport("kernel32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool IsProcessorFeaturePresent(ProcessorFeature processorFeature);

User-Defined Types:

static extern bool IsProcessorFeaturePresent(ProcessorFeature processorFeature);

public enum ProcessorFeature : uint {
    /// <summary>
    /// On a Pentium, a floating-point precision error can occur in rare circumstances
    /// </summary>
    FloatingPointPrecisionErrata = 0,
    /// <summary>
    /// Floating-point operations are emulated using a software emulator.
    /// This function returns a nonzero value if floating-point operations are emulated; otherwise, it returns zero.
    /// </summary>
    FloatingPointEmulated = 1,
    /// <summary>
    /// The atomic compare and exchange operation (cmpxchg) is available
    /// </summary>
    CompareExchangeDouble = 2,
    /// <summary>
    /// The MMX instruction set is available
    /// </summary>
    InstructionsMMXAvailable = 3,
    /// <summary>
    /// The SSE instruction set is available
    /// </summary>
    InstructionsXMMIAvailable = 6,
    /// <summary>
    /// The 3D-Now instruction set is available.
    /// </summary>
    Instruction3DNowAvailable = 7,
    /// <summary>
    /// The RDTSC instruction is available
    /// </summary>
    InstructionRDTSCAvailable = 8,
    /// <summary>
    /// The processor is PAE-enabled
    /// </summary>
    PAEEnabled = 9,
    /// <summary>
    /// The SSE2 instruction set is available
    /// </summary>
    InstructionsXMMI64Available = 10,
    /// <summary>
    /// Data execution prevention is enabled. (This feature is not supported until Windows XP SP2 and Windows Server 2003 SP1)
    /// </summary>
    NXEnabled = 12,
    /// <summary>
    /// The SSE3 instruction set is available. (This feature is not supported until Windows Vista)
    /// </summary>
    InstructionsSSE3Available = 13,
    /// <summary>
    /// The atomic compare and exchange 128-bit operation (cmpxchg16b) is available. (This feature is not supported until Windows Vista)
    /// </summary>
    CompareExchange128 = 14,
    /// <summary>
    /// The atomic compare 64 and exchange 128-bit operation (cmp8xchg16) is available (This feature is not supported until Windows Vista.)
    /// </summary>
    Compare64Exchange128 = 15,
    /// <summary>
    /// TBD
    /// </summary>
    ChannelsEnabled = 16,
    /// <summary>
    /// On a Pentium, a floating-point precision error can occur in rare circumstances
    /// </summary>
    FloatingPointPrecisionErrata = 0,
    /// <summary>
    /// Floating-point operations are emulated using a software emulator.
    /// This function returns a nonzero value if floating-point operations are emulated; otherwise, it returns zero.
    /// </summary>
    FloatingPointEmulated = 1,
    /// <summary>
    /// The atomic compare and exchange operation (cmpxchg) is available
    /// </summary>
    CompareExchangeDouble = 2,
    /// <summary>
    /// The MMX instruction set is available
    /// </summary>
    InstructionsMMXAvailable = 3,
    /// <summary>
    /// The SSE instruction set is available
    /// </summary>
    InstructionsXMMIAvailable = 6,
    /// <summary>
    /// The 3D-Now instruction set is available.
    /// </summary>
    Instruction3DNowAvailable = 7,
    /// <summary>
    /// The RDTSC instruction is available
    /// </summary>
    InstructionRDTSCAvailable = 8,
    /// <summary>
    /// The processor is PAE-enabled
    /// </summary>
    PAEEnabled = 9,
    /// <summary>
    /// The SSE2 instruction set is available
    /// </summary>
    InstructionsXMMI64Available = 10,
    /// <summary>
    /// Data execution prevention is enabled. (This feature is not supported until Windows XP SP2 and Windows Server 2003 SP1)
    /// </summary>
    NXEnabled = 12,
    /// <summary>
    /// The SSE3 instruction set is available. (This feature is not supported until Windows Vista)
    /// </summary>
    InstructionsSSE3Available = 13,
    /// <summary>
    /// The atomic compare and exchange 128-bit operation (cmpxchg16b) is available. (This feature is not supported until Windows Vista)
    /// </summary>
    CompareExchange128 = 14,
    /// <summary>
    /// The atomic compare 64 and exchange 128-bit operation (cmp8xchg16) is available (This feature is not supported until Windows Vista.)
    /// </summary>
    CompareExchange128 = 15,
    /// <summary>
    /// TBD
    /// </summary>
    ChannelsEnabled = 16,
}

Notes:

User-Defined Types:

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Notes:

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