|
LI16 111011 |
rd |
Encoded Immediate |
|
6 |
3 |
7 |
LI16 rd, decoded_immediate |
microMIPS |
Load Immediate Word (16-bit instr size) |
Load Immediate Word (16-bit instr size)
To load a 6-bit constant into a register.
GPR[rd] = decoded_immediate
The 7-bit encoded Immediate field is decoded to obtain the actual immediate value. Table 5.12 shows the encoded values of the Immeidiate field and the actual immediate values.
Table 5.12 LI16 -1, 0..126 Immediate Field Encoding Range
|
Encoded Input (Hex) |
Decoded Value (Decimal) |
|
0 |
0 |
|
1 |
1 |
|
2 |
2 |
|
3 |
3 |
|
... |
... |
|
7e |
126 |
|
7f |
-1 |
The actual decoded immediate value is sign-extended and placed into GPR rd.
No Integer Overflow exception occurs under any circumstances.
The 3-bit register fields can only specify GPRs $2-$7, $16, $17.
decoded_immediate = Decode(encoded_immediate) temp = sign_extend(decoded_immediate) GPR[rd] = temp63..0
None