Intel Core (client)
Skylake
Intel Skylake (2015) supports x86-64-v3.
- x86-64 level
- x86-64-v3
Pentium and Celeron models: x86-64-v2 - Vendor
- Intel
- First products
- 2015
- Products
- 6th generation Core; Xeon E3 v5
- Segments
- GCC target
-march=skylake- Optimization
- Optimizing code for Skylake to Cooper Lake
Product lines
| Product line | Segment | Socket | Source |
|---|---|---|---|
| 6th generation Core | desktop | LGA1151, BGA1440 | intel.com |
| 6th generation Core | mobile | BGA1440, BGA1356, BGA1515 | intel.com |
| 6th generation Core | embedded | LGA1151, BGA1440 | intel.com |
| Pentium and Celeron | desktop | LGA1151 | intel.com |
| Pentium and Celeron | mobile | BGA1356, BGA1515 | intel.com |
| Pentium and Celeron | embedded | LGA1151, BGA1440 | intel.com |
| Xeon E3 v5 | server | LGA1151, BGA1440 | intel.com |
| Xeon E3 v5 | mobile | BGA1440 | intel.com |
| Xeon E3 v5 | embedded | LGA1151, BGA1440 | intel.com |
Why not x86-64-v4?
Skylake lacks AVX512BW, AVX512CD, AVX512DQ, AVX512F and AVX512VL, all of which x86-64-v4 requires.
Feature checklist
| Feature | Skylake | Enumerated by | Linux flag |
|---|---|---|---|
| x86-64-v1 | |||
| CMOV | Yes | CPUID.01H:EDX[15] | cmov |
| CX8 | Yes | CPUID.01H:EDX[8] | cx8 |
| FPU | Yes | CPUID.01H:EDX[0] | fpu |
| FXSR | Yes | CPUID.01H:EDX[24] | fxsr |
| MMX | Yes | CPUID.01H:EDX[23] | mmx |
| OSFXSR via FXSR | Yes | CPUID.01H:EDX[24] | fxsr |
| SCE | Yes | CPUID.80000001H:EDX[11] | syscall |
| SSE | Yes | CPUID.01H:EDX[25] | sse |
| SSE2 | Yes | CPUID.01H:EDX[26] | sse2 |
| x86-64-v2 | |||
| CMPXCHG16B | Yes | CPUID.01H:ECX[13] | cx16 |
| LAHF-SAHF | Yes | CPUID.80000001H:ECX[0] | lahf_lm |
| POPCNT | Yes | CPUID.01H:ECX[23] | popcnt |
| SSE3 | Yes | CPUID.01H:ECX[0] | pni |
| SSE4.1 | Yes | CPUID.01H:ECX[19] | sse4_1 |
| SSE4.2 | Yes | CPUID.01H:ECX[20] | sse4_2 |
| SSSE3 | Yes | CPUID.01H:ECX[9] | ssse3 |
| x86-64-v3 | |||
| AVX | Yes | CPUID.01H:ECX[28] | avx |
| AVX2 | Yes | CPUID.(EAX=07H,ECX=0):EBX[5] | avx2 |
| BMI1 | Yes | CPUID.(EAX=07H,ECX=0):EBX[3] | bmi1 |
| BMI2 | Yes | CPUID.(EAX=07H,ECX=0):EBX[8] | bmi2 |
| F16C | Yes | CPUID.01H:ECX[29] | f16c |
| FMA | Yes | CPUID.01H:ECX[12] | fma |
| LZCNT | Yes | CPUID.80000001H:ECX[5] | abm |
| MOVBE | Yes | CPUID.01H:ECX[22] | movbe |
| OSXSAVE via XSAVE | Yes | CPUID.01H:ECX[26] | xsave |
| x86-64-v4 | |||
| AVX512F | No | CPUID.(EAX=07H,ECX=0):EBX[16] | avx512f |
| AVX512BW | No | CPUID.(EAX=07H,ECX=0):EBX[30] | avx512bw |
| AVX512CD | No | CPUID.(EAX=07H,ECX=0):EBX[28] | avx512cd |
| AVX512DQ | No | CPUID.(EAX=07H,ECX=0):EBX[17] | avx512dq |
| AVX512VL | No | CPUID.(EAX=07H,ECX=0):EBX[31] | avx512vl |
Other extensions
Notable extensions outside the x86-64 levels. Vendors sometimes disable these on individual models. Linked names lead to the extension's instructions.
Known vulnerabilities
The CVEs that the sources of the vulnerability list name as affecting Skylake, in all of its models or in some of them.
- CVE-2025-40300 VMSCAPE
- CVE-2024-24853 Intel BIOS, UEFI and SMM: SMI Transfer Monitor transition order Some models
- CVE-2022-40982 Gather Data Sampling
- CVE-2022-29901 Retbleed: Return Stack Buffer Underflow
- CVE-2022-21180 Intel processor errata: Undefined MMIO Hang
- CVE-2022-21166 Processor MMIO Stale Data: Device Register Partial Write
- CVE-2022-21151 Optimization Removal of Security-critical Code
- CVE-2022-21127 Special Register Buffer Data Sampling: Special Register Buffer Data Sampling update
- CVE-2022-21125 Processor MMIO Stale Data: Shared Buffers Data Sampling
- CVE-2022-21123 Processor MMIO Stale Data: Shared Buffers Data Read
- CVE-2021-0127 Intel processor errata: Breakpoint control flow Some models
- CVE-2021-0089 Speculative Code Store Bypass
- CVE-2021-0086 Floating Point Value Injection
- CVE-2020-24512 Influence of Trivial Data Value in Cache Policy
- CVE-2020-8696 Vector Register Sampling: Vector Register Sampling Active
- CVE-2020-8695 RAPL Energy Reporting: RAPL energy reporting
- CVE-2020-0551 Load Value Injection
- CVE-2020-0549 L1D Eviction Sampling
- CVE-2020-0548 Vector Register Sampling
- CVE-2020-0543 Special Register Buffer Data Sampling
- CVE-2019-11157 Voltage Settings Modification
- CVE-2019-11135 TSX Asynchronous Abort
- CVE-2019-11091 Microarchitectural Data Sampling: Microarchitectural Data Sampling Uncacheable Memory
- CVE-2019-1125 Spectre variant 1: Spectre v1 swapgs
- CVE-2018-12207 iTLB multihit: Machine Check Error Avoidance on Page Size Change
- CVE-2018-12130 Microarchitectural Data Sampling: Microarchitectural Fill Buffer Data Sampling
- CVE-2018-12127 Microarchitectural Data Sampling: Microarchitectural Load Port Data Sampling
- CVE-2018-12126 Microarchitectural Data Sampling: Microarchitectural Store Buffer Data Sampling
- CVE-2018-3646 L1 Terminal Fault: L1 Terminal Fault: virtualization
- CVE-2018-3640 Rogue System Register Read
- CVE-2018-3639 Speculative Store Bypass
- CVE-2018-3620 L1 Terminal Fault: L1 Terminal Fault: operating systems and SMM
- CVE-2018-3615 L1 Terminal Fault: L1 Terminal Fault: SGX
- CVE-2017-5754 Meltdown: Rogue Data Cache Load
- CVE-2017-5753 Spectre variant 1: Bounds Check Bypass
- CVE-2017-5715 Spectre variant 2: Branch Target Injection
Other Intel Core (client) microarchitectures
- NetBurst (Prescott, Nocona) 2004 v1
- Core (Merom, Conroe) 2006 v1
- Penryn 2007 v1
- Nehalem 2008 v2
- Westmere 2010 v2
- Sandy Bridge 2011 v2
- Ivy Bridge 2012 v2
- Haswell 2013 v3
- Broadwell 2014 v3
- Skylake 2015 v3
- Kaby Lake 2016 v3
- Coffee Lake 2017 v3
- Cannon Lake 2018 v4
- Comet Lake 2019 v3
- Ice Lake (client) 2019 v4
- Tiger Lake 2020 v4
- Alder Lake 2021 v3
- Rocket Lake 2021 v4
- Raptor Lake 2022 v3
- Meteor Lake 2023 v3
- Arrow Lake 2024 v3
- Lunar Lake 2024 v3
- Panther Lake 2026 v3
- Nova Lake announced v4
Sources
- GCC -march=skylake feature set (PTA_SKYLAKE)
- Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 4, 335592-093, Table 2-1: Models 06_4EH and 06_5EH: 6th generation Core, Xeon E3-1500m v5 and E3-1200 v5.
- Intel ARK: Products formerly Skylake: Launch dates; the earliest is Q3'15 (Core i7-6500U).