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==General Purpose==
The 16 general purpose registers may be treated as 64 bit [[Quad Word]] ([[Bitboards|bitboard]]), 32 bit [[Double Word]], 16 bit [[Word]] and high(partly), low [[Byte]]<ref>[https://software.intel.com/en-us/articles/introduction-to-x64-assembly Introduction to x64 Assembly | Intel® Software]</ref>:
{| class="wikitable"
|-
| R08D
| R08W
| R08H - | R08L R08B
| GP
|-
| R..D
| R..W
| R..H -| R..L B
| GP
|-
| R15D
| R15W
| R15H - | R15L R15B
| GP
|}
