|
ANDI16 001011 |
rd |
rs |
Encoded Immediate |
|
6 |
3 |
3 |
4 |
ANDI16 rd, rs, decoded_immediate_value |
microMIPS |
And Immediate (16-bit instr size) |
And Immediate (16-bit instr size)
To do a bitwise logical AND with a constant
GPR[rd] = GPR[rs] AND zero_extend(decoded immediate)
The encoded immediate field is decoded to obtain the actual immediate value
The decoded immediate is zero-extended to the left and combined with the contents of GPR rs in a bitwise logical
AND operation. The result is placed into GPR rd.
Table 5-2 Encoded and Decoded Values of Immediate Field
|
Encoded Value of Instr3..0 (Decimal) |
Encoded Value of Instr3..0 (Hex) |
Decoded Value of Immediate (Decimal) |
Decoded Value of Immediate (Hex) |
|
0 |
0x0 |
128 |
0x80 |
|
1 |
0x1 |
1 |
0x1 |
|
2 |
0x2 |
2 |
0x2 |
|
3 |
0x3 |
3 |
0x3 |
|
4 |
0x4 |
4 |
0x4 |
|
5 |
0x5 |
7 |
0x7 |
|
6 |
0x6 |
8 |
0x8 |
|
7 |
0x7 |
15 |
0xf |
|
8 |
0x8 |
16 |
0x10 |
|
9 |
0x9 |
31 |
0x1f |
|
10 |
0xa |
32 |
0x20 |
|
11 |
0xb |
63 |
0x3f |
|
12 |
0xc |
64 |
0x40 |
|
13 |
0xd |
255 |
0xff |
|
14 |
0xe |
32768 |
0x8000 |
|
15 |
0xf |
65535 |
0xffff |
The 3-bit register fields can only specify GPRs $2-$7, $16, $17.
GPR[rd] = GPR[rs] and zero_extend(decoded immediate)
None