BCLR - RISC-V instruction reference

bclrClear bit 
Sets t1 to t2 with the bit whose index is in the low bits of t3 cleared.
RISC-V manual: bclr 
Forms  bclr , ,   
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; bclr writes 9 to t2.
bclr t2, t0, t1