Microprocessor without Interlocked Pipeline Stages


number name description
0 zero always zero
1 at temporary
2-3 v0-v1 return value from a function call
4-7 a0-a3 first four parameters of a function call
8-15 t0-t7 temporary variables need not to be preserved
16-23 s0-s7 function variables, must be preserved
24-25 t8-t9 two more temporary variables
26-27 k0-k1 kernel use registers
28 gp global pointer
29 st stack pointer
30 fp frame pointer
31 ra return address register

Instruction set

Instruction short name description
slti r, s, imm Set on less than immediate (signed) If s is less than immediate, t is set to one. It gets zero otherwise.