CPUs
8086 (1978)
Added flags80286 (1982)
Extended registers to 32-bits80386 (1985)
Added 80-bit floating point registers80486 (1989)
Added flagsPentium (1993)
Added 64-bit floating point registersPentium MMX (1996)
Added 128-bit SIMD registersPentium III (1999)
Extended registers to 64-bitsAthlon 64 (2003)
Added 256-bit SIMD registersCore ix 2k (2011)
Legend
8-bits
16-bits
32-bits
64-bits
80-bits
128-bits
256-bits
Status register
General purpose registers
Segment selectors
Program counter
Instruction PointerIP
FLAGS
Instruction PointerEIP
EFLAGS
Floating point registers
SIMD registers
Instruction PointerRIP
RFLAGS