SRA - RISC-V instruction reference

sraShift right arithmetic 
Shifts t2 right by the amount in the low 5 bits of t3 (6 on RV64), filling with the sign bit, and stores the result in t1.
RISC-V manual: sra 
Forms  sra , ,   
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, 13
li t1, 2
# t0=13, t1=2; sra writes 3 to t2.
sra t2, t0, t1