immediate operand

immediate operand

[i′mē·dē·ət ′äp·ə‚rand]
(computer science)
An operand contained in the instruction which specifies the operation.
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Command Part 1 (CP1) provides a 5-bit operating code, and Command Part 2 (CP2) offers the immediate operand, which is the lower 5 bits of the command.
For example, a Pentium instruction might include several 8-bit prefixes, an 8-bit opcode, 8-bit format bytes, and a 16-bit immediate operand.
The "Eb,Ib" suffix, which uses an immediate operand as the source, cannot use this scheme, so we specify the full opcode as MOV.
Stack activity also can be reduced by moving constants on the stack into native instructions as immediate operands.
Immediate constants are often small; 69 percent of the immediate operands can be encoded in 4 or fewer bits and 96 percent in 8 or fewer bits [18]; the corresponding figures from [16] are 60 percent and 70 percent.
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