core.cpuid

Identify the characteristics of the host CPU, providing information about cache sizes and assembly optimisation hints. This module is provided primarily for assembly language programmers.

References: Some of this information was extremely difficult to track down. Some of the documents below were found only in cached versions stored by search engines! This code relies on information found in:

"Intel(R) 64 and IA-32 Architectures Software Developers Manual, Volume 2A: Instruction Set Reference, A-M" (2007).
"AMD CPUID Specification", Advanced Micro Devices, Rev 2.28 (2008).
"AMD Processor Recognition Application Note For Processors Prior to AMD Family 0Fh Processors", Advanced Micro Devices, Rev 3.13 (2005).
"AMD Geode(TM) GX Processors Data Book", Advanced Micro Devices, Publication ID 31505E, (2005).
"AMD K6 Processor Code Optimisation", Advanced Micro Devices, Rev D (2000).
"Application note 106: Software Customization for the 6x86 Family", Cyrix Corporation, Rev 1.5 (1998)
http://www.datasheetcatalog.org/datasheet/nationalsemiconductor/GX1.pdf
"Geode(TM) GX1 Processor Series Low Power Integrated X86 Solution", National Semiconductor, (2002)
"The VIA Isaiah Architecture", G. Glenn Henry, Centaur Technology, Inc (2008).
http://www.sandpile.org/ia32/cpuid.htm
http://www.akkadia.org/drepper/cpumemory.pdf
"What every programmer should know about memory", Ulrich Depper, Red Hat, Inc., (2007).
"CPU Identification by the Windows Kernel", G. Chappell (2009). http://www.geoffchappell.com/viewer.htm?doc=studies/windows/km/cpu/cx8.htm
"Intel(R) Processor Identification and the CPUID Instruction, Application Note 485" (2009).

Members

Properties

aes bool aes [@property getter]: Is AES supported
amd3dnow bool amd3dnow [@property getter]: Is AMD 3DNOW supported?
amd3dnowExt bool amd3dnowExt [@property getter]: Is AMD 3DNOW Ext supported?
amdMmx bool amdMmx [@property getter]: Are AMD extensions to MMX supported?
avx bool avx [@property getter]: Is AVX supported
avx2 bool avx2 [@property getter]: Is AVX2 supported
avx512f bool avx512f [@property getter]: Is AVX512F supported
cacheLevels uint cacheLevels [@property getter]: The number of cache levels in the CPU.
coresPerCPU uint coresPerCPU [@property getter]: Returns number of cores in CPU
dataCaches const(CacheInfo)[5] dataCaches [@property getter]: The data caches. If there are fewer than 5 physical caches levels, the remaining levels are set to size_t.max (== entire memory space)
fma bool fma [@property getter]: Is FMA supported
fp16c bool fp16c [@property getter]: Is FP16C supported
has3dnowPrefetch bool has3dnowPrefetch [@property getter]: Is 3DNow prefetch supported?
hasCmov bool hasCmov [@property getter]: Is cmov supported?
hasCmpxchg16b bool hasCmpxchg16b [@property getter]: Is cmpxchg8b supported?
hasCmpxchg8b bool hasCmpxchg8b [@property getter]: Is cmpxchg8b supported?
hasFxsr bool hasFxsr [@property getter]: Is fxsave/fxrstor supported?
hasLahfSahf bool hasLahfSahf [@property getter]: Are LAHF and SAHF supported in 64-bit mode?
hasLzcnt bool hasLzcnt [@property getter]: Is LZCNT supported?
hasPclmulqdq bool hasPclmulqdq [@property getter]: Is pclmulqdq supported
hasPopcnt bool hasPopcnt [@property getter]: Is POPCNT supported?
hasRdrand bool hasRdrand [@property getter]: Is rdrand supported
hasRdseed bool hasRdseed [@property getter]: Is rdseed supported
hasRdtsc bool hasRdtsc [@property getter]: Is rdtsc supported?
hasSha bool hasSha [@property getter]: Is SHA supported
hasSysEnterSysExit bool hasSysEnterSysExit [@property getter]: Is SYSENTER/SYSEXIT supported?
hasVpclmulqdq bool hasVpclmulqdq [@property getter]: Is vpclmulqdq supported
hle bool hle [@property getter]: Is HLE (hardware lock elision) supported
hyperThreading bool hyperThreading [@property getter]: Is hyperthreading supported?
isItanium bool isItanium [@property getter]: Is this an IA64 (Itanium) processor?
isX86_64 bool isX86_64 [@property getter]: Is this an Intel64 or AMD 64?
mmx bool mmx [@property getter]: Is MMX supported?
preferAthlon bool preferAthlon [@property getter]: Optimisation hints for assembly code.
preferPentium1 bool preferPentium1 [@property getter]: Does this CPU perform better on Pentium I code than Pentium Pro code?
preferPentium4 bool preferPentium4 [@property getter]: Does this CPU perform better on Pentium4 code than PentiumPro..Core2 code?
processor string processor [@property getter]: Returns processor string, for display purposes only
rtm bool rtm [@property getter]: Is RTM (restricted transactional memory) supported
sse bool sse [@property getter]: Is SSE supported?
sse2 bool sse2 [@property getter]: Is SSE2 supported?
sse3 bool sse3 [@property getter]: Is SSE3 supported?
sse41 bool sse41 [@property getter]: Is SSE4.1 supported?
sse42 bool sse42 [@property getter]: Is SSE4.2 supported?
sse4a bool sse4a [@property getter]: Is SSE4a supported?
ssse3 bool ssse3 [@property getter]: Is SSSE3 supported?
threadsPerCPU uint threadsPerCPU [@property getter]: Returns number of threads per CPU
vaes bool vaes [@property getter]: Is VEX-Encoded AES supported
vendor string vendor [@property getter]: Returns vendor string, for display purposes only. Do NOT use this to determine features! Note that some CPUs have programmable vendorIDs.
x87onChip bool x87onChip [@property getter]: Does it have an x87 FPU on-chip?

Static variables

datacache CacheInfo[5] datacache;: Scheduled for deprecation. Please use dataCaches instead.
family uint family;
model uint model;: Warning: This field will be turned into a property in a future release.
numCacheLevels uint numCacheLevels;: This field has been deprecated. Please use cacheLevels instead.
stepping uint stepping;: Warning: This field will be turned into a property in a future release.

Structs

CacheInfo struct CacheInfo: Cache size and behaviour

Bugs

Currently only works on x86 and Itanium CPUs. Many processors have bugs in their microcode for the CPUID instruction, so sometimes the cache information may be incorrect.

core.cpuid

Members

Properties

Static variables

Structs

Bugs

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