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immediate value

A number written into the instruction itself, like the 42 in mov eax, 42.

An immediate is a constant operand encoded inside the instruction's machine code; each ISA limits its size (x86-64 mostly 32 bits sign-extended, ARM64 12- or 16-bit fields, RISC-V 12 bits signed).

Examples

  • In add rax, 5, the 5 is an immediate: it sits in the instruction's own bytes.

See also

operand immediate encoding
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