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Architecture
98
Examples of Instruction Notation
Two examples of the notation used in explaining instructions are given below.
Example 1:
GPR[rt] ← immediate || 0
16
This means that 16 zero bits are concatenated with an immediate value
(normally 16 bits), and the resulting 32-bit string (with the lower 16 bits
cleared to 0) is assigned to general-purpose register (GPR) rt.
Example 2:
(immediate
15
)
16
|| immediate
15..0
Bit 15 (the sign bit) of an immediate value is extended to form a 16-bit
string, which is linked to bits 15 to 0 of the immediate value, resulting in a
32-bit sign-extended value.