DIVW - RISC-V instruction reference

divwDivide word (32-bit) RV64 only
Divides the low 32 bits of t2 by those of t3 as signed values and sign-extends the quotient into t1 (RV64 only).
RISC-V manual: divw 
Forms  divw , ,   
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. 
This example runs on RV64.
 .text
li t0, 18
li t1, 5
# t0=18, t1=5; divw writes 3 to t2.
divw t2, t0, t1