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## Registers
| Register (32, 16, 8H, 8L)-Bit | Usage | Preserved Across Function Calls |
| Register (32, 16, 8H, 8L)-bit | Usage | Preserved Across Function Calls |
|--------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------|---------------------------------|
| %rax (eax, ax, ah, al) | Temporary register; with variable arguments passes information about the number of vector registers used; 1st return register | No |
| %rbx (ebx, ax, ah, al) | Callee-saved register; optionally used as base pointer | Yes |