|
EXTEND 11110 |
imm 10:5 |
imm 15:11 |
I8 01100 |
ADJSP 011 |
0 000 |
imm 4:0 |
|
5 |
6 |
5 |
5 |
3 |
3 |
5 |
ADDIU sp, immediate |
MIPS16e |
Add Immediate Unsigned Word (2-Operand, SP-Relative, Extended) |
Add Immediate Unsigned Word (2-Operand, SP-Relative, Extended)
To add a constant to the stack pointer.
GPR[sp] = GPR[sp] + immediate
The 16-bit immediate is sign-extended, and then added to the contents of GPR 29 to form a 32-bit result. The result is placed in GPR 29.
No integer overfl w exception occurs under any circumstances.
None
temp = GPR[29] + sign_extend(immediate) GPR[29] = temp
None
The term "unsigned" in the instruction name is a misnomer;this operation is 32-bit modulo arithmetic that does not trap on overfl w. It is appropriate for unsigned arithmetic, such as address arithmetic, or integer arithmetic environments that ignore overfl w, such as C language arithmetic.