x86-64.net

AMD (high performance)

K8 (Hammer)

AMD K8 (Hammer) (2003) supports x86-64-v1.

x86-64 level
x86-64-v1
Vendor
AMD
First products
2003
Products
Athlon 64, Opteron, Turion 64 and 64-bit Sempron
GCC target
-march=k8

The first x86-64 processors. Later revisions add SSE3 (GCC's -march=k8-sse3) and LAHF/SAHF in 64-bit mode, but no K8 has SSSE3, so all of them stay at the baseline.

Why not x86-64-v2?

K8 (Hammer) lacks CMPXCHG16B, LAHF-SAHF, POPCNT, SSE3, SSE4.1, SSE4.2 and SSSE3, all of which x86-64-v2 requires.

Feature checklist

Features required by each x86-64 level and whether K8 (Hammer) has them. OSFXSR and OSXSAVE are set by the operating system; the table checks the hardware features they depend on.
FeatureK8 (Hammer)Enumerated byLinux flag
x86-64-v1
CMOVYesCPUID.01H:EDX[15]cmov
CX8YesCPUID.01H:EDX[8]cx8
FPUYesCPUID.01H:EDX[0]fpu
FXSRYesCPUID.01H:EDX[24]fxsr
MMXYesCPUID.01H:EDX[23]mmx
OSFXSR via FXSRYesCPUID.01H:EDX[24]fxsr
SCEYesCPUID.80000001H:EDX[11]syscall
SSEYesCPUID.01H:EDX[25]sse
SSE2YesCPUID.01H:EDX[26]sse2
x86-64-v2
CMPXCHG16BNoCPUID.01H:ECX[13]cx16
LAHF-SAHFNoCPUID.80000001H:ECX[0]lahf_lm
POPCNTNoCPUID.01H:ECX[23]popcnt
SSE3NoCPUID.01H:ECX[0]pni
SSE4.1NoCPUID.01H:ECX[19]sse4_1
SSE4.2NoCPUID.01H:ECX[20]sse4_2
SSSE3NoCPUID.01H:ECX[9]ssse3
x86-64-v3
AVXNoCPUID.01H:ECX[28]avx
AVX2NoCPUID.(EAX=07H,ECX=0):EBX[5]avx2
BMI1NoCPUID.(EAX=07H,ECX=0):EBX[3]bmi1
BMI2NoCPUID.(EAX=07H,ECX=0):EBX[8]bmi2
F16CNoCPUID.01H:ECX[29]f16c
FMANoCPUID.01H:ECX[12]fma
LZCNTNoCPUID.80000001H:ECX[5]abm
MOVBENoCPUID.01H:ECX[22]movbe
OSXSAVE via XSAVENoCPUID.01H:ECX[26]xsave
x86-64-v4
AVX512FNoCPUID.(EAX=07H,ECX=0):EBX[16]avx512f
AVX512BWNoCPUID.(EAX=07H,ECX=0):EBX[30]avx512bw
AVX512CDNoCPUID.(EAX=07H,ECX=0):EBX[28]avx512cd
AVX512DQNoCPUID.(EAX=07H,ECX=0):EBX[17]avx512dq
AVX512VLNoCPUID.(EAX=07H,ECX=0):EBX[31]avx512vl

Sources

  1. GCC -march=k8 (processor alias table)
  2. Wikipedia: AMD K8