sub $dest, $src1, $src2
Subtract one register from another, and store the result in a third register.
Format
This is an RR format instrucion.
| 31 - 26 |
25 - 21 |
20 - 16 |
15 - 11 |
10 - 0 |
| 001100 |
dest |
src1 |
src2 |
00000000000 |
Functional Description
The sub instruction subtracts one operand register src2 from operand register src2, then stores the result in dest.
dest = src1 + !src2 + 1
Side Effects
If overflow occurs, the exception cause
register is logically ored with the value 0x1, and the exception
PC (EPC) register is set to the program counter of the offending
instruction. Control then flows to an operating system exception handler.
Processor Mode
This is a user-level instruction.
Last modified: Sun Feb 25 12:47:21 CST 2001