SLTU - RISC-V instruction reference

sltuSet if less than unsigned 
Sets t1 to 1 if t2 is less than t3 as unsigned integers, otherwise to 0.
RISC-V manual: sltu 
Forms  sltu , ,   
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, -1
li t1, 1
# t0=0xFFFFFFFF is unsigned-greater than t1=1; sltu writes 0 to t2.
sltu t2, t0, t1