x86 is a faimily o backward compatible instruction set airchitecturs[a] based on the Intel 8086 CPU an its Intel 8088 variant.
Quick facts Designer, Bits ...
x86| Designer | Intel, AMD |
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| Bits | 16-bit, 32-bit an 64-bit |
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| Introduced | 1978 (16-bit), 1985 (32-bit), 2003 (64-bit) |
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| Design | CISC |
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| Teep | Register-memory |
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| Encodin | Variable (1 tae 15 bytes) |
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| Brainchin | Status register |
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| Endianness | Little |
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| Page size | 8086–i286: None
i386, i486: 4 KB pages
P5 Pentium: addit 4 MB pages
(Legacy PAE: 4 KB→2 MB)
x86-64: addit 1 GB pages |
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| Extensions | x87, IA-32, MMX, SSE, SSE2, x86-64, SSE3, SSSE3, SSE4, SSE5, AVX |
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| Appen | Pairtly. For some advanced featurs, x86 mey require license frae Intel; x86-64 mey require an addeetional license frae AMD. The 80486 processor haes been on the mercat for mair nor 20 years[1] an so cannot be subject tae patent claims. The pre-586 subset o the x86 airchitectur is tharefore fully open. |
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| Registers |
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| General purpose | - 16-bit: six semi-dedicatit registers, BP an SP are nae general-purpose
- 32-bit: aicht GPRs, includin EBP an ESP
- 64-bit: 16 GPRs, includin RBP an RSP
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| Floatin pynt | - 16-bit: optional separate x87 FPU
- 32-bit: optional separate or integratit x87 FPU, integratit SSE2 units in later processors
- 64-bit: integratit x87 an SSE2 units
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