setIf will set a feature if boolean is true.

CombineFeatures allows to combine several features for a close to constant time lookup.

hasSet returns whether all features are present.

addFeats returns a fresh slice of base plus add, avoiding append aliasing.

Has allows for checking a single feature. Should be inlined by the compiler.

FeatureSet returns all available features as strings.

Detect will re-detect current CPU info. This will replace the content of the exported CPU variable. Unless you expect the CPU to change while you are

Supports returns whether the CPU supports all of the requested features.

X64Level returns the microarchitecture level detected on the CPU. If features are lacking or non x64 mode, 0 is returned. See https://en.wikipedia.org

Strings returns an array of the detected features for FlagsSet.

HasOneOf returns whether the CPU supports one or more of the requested features.

GOARM64 returns a value usable as the GOARM64 build setting for the detected CPU, e.g. "v8.4" or "v9.0,crypto". The ",crypto" suffix is appended when

nEnabled will return the number of enabled flags.

ARM64Level returns the ARMv8/ARMv9 architecture version supported by the CPU as (major, minor), e.g. 8, 4 for ARMv8.4-A or 9, 0 for ARMv9.0-A. Only ma

Ia32TscAux returns the IA32_TSC_AUX part of the RDTSCP. This variable is OS dependent, but on Linux contains information about the current cpu/core th

ParseFeature will parse the string and return the ID of the matching feature. Will return UNKNOWN if not found.

RTCounter returns the 64-bit time-stamp counter Uses the RDTSCP instruction. The value 0 is returned if the CPU does not support the instruction.

RVProfile returns the RISC-V application profile level. 0 = unknown / base ISA only, 20 = RVA20, 22 = RVA22, 23 = RVA23. Returns 0 on non-RISC-V archi

VM Will return true if the cpu id indicates we are in a virtual machine.

hasOneOf returns whether one or more features are present.

Disable will disable one or several features.

Enable will disable one or several features even if they were undetected. This is of course not recommended for obvious reasons.

LogicalCPU will return the Logical CPU the code is currently executing on. This is likely to change when the OS re-schedules the running thread to ano

frequencies tries to compute the clock speed of the CPU. If leaf 15 is supported, use it, otherwise parse the brand string. Yes, really.

hasSet returns whether all features are present.

or with another flagset.

AnyOf returns whether the CPU supports one or more of the requested features.

DetectARM will detect ARM64 features. This is NOT done automatically since it can potentially crash if the OS does not handle the command. If in the f

This example will calculate the chip/core number on Linux Linux encodes numa id (<<12) and core id (8bit) into TSC_AUX.

Flags will enable flags. This must be called *before* flag.Parse AND Detect must be called after the flags have been parsed. Note that this means that

IsVendor returns true if vendor is recognized as Intel

SveLengths returns arm SVE vector and predicate lengths in bits. Will return 0, 0 if SVE is not enabled or otherwise unable to detect.

TestAMDMemEncryption tests AMDMemEncryption detection

There is no real way to test a CPU identifier, since results will obviously differ on each machine.

Tests that the returned L1 data cache value matches the value returned from a call to the OS `sysctl` utility. Skips the test if we can't run it.

Tests that the returned L1 instruction cache value matches the value returned from a call to the OS `sysctl` utility. Skips the test if we can't run i

Prints the value of Ia32TscAux()

Prints the value of LogicalCPU()