SRAI: RISC-V instruction reference

sraiShift right arithmetic immediate 
Shifts the second register right by an immediate amount, filling with the sign bit, and stores the result in the first.
RISC-V manual: srai 
Used in Arithmetic, logic and bitsRISC-V assembly
Flappy ASMRISC-V assembly
 
Forms  srai , ,   
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. 
imm6 An unsigned shift count or bit number: 0 to 63 in RV64, or 0 to 31 in RV32. 
This example runs on RV64.
 .text
li t0, 13
# t0=13, immediate 2; srai writes 3 to t2.
srai t2, t0, 2