MINU - RISC-V instruction reference

minuMinimum (unsigned) 
Sets t1 to the smaller of t2 and t3, comparing as unsigned.
RISC-V manual: minu 
Forms  minu , ,   
Operands t1 Any integer register, x0 to x31, or its named alias, such as zero, t0 or t6. 
t2 An integer register. It may be the same register as t1. 
t3 An integer register. It may be the same register as t1. 
 .text
li t0, 18
li t1, 5
# t0=18, t1=5; minu writes 5 to t2.
minu t2, t0, t1