SRAIW: RISC-V instruction reference

sraiwShift right arithmetic immediate word (32-bit) RV64 only
Shifts the low 32 bits of the second register right by an immediate amount, filling with the sign bit, and sign-extends into the first.
RISC-V manual: sraiw 
Forms  sraiw , ,   
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. 
imm5 An unsigned 5-bit immediate, 0 to 31, used for values such as a shift count or a CSR immediate. 
This example runs on RV64.
 .text
li t0, 13
# t0=13, immediate 2; sraiw writes 3 to t2.
sraiw t2, t0, 2