SLLW: RISC-V instruction reference

sllwShift left logical word (32-bit) RV64 only
Shifts the low 32 bits of the second register left by the amount in the low 5 bits of the third and sign-extends the result into the first.
RISC-V manual: sllw 
Forms  sllw , ,   
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, 13
li t1, 2
# t0=13, t1=2; sllw writes 52 to t2.
sllw t2, t0, t1