SLTZ - RISC-V instruction reference

sltzSet less than zero Pseudo-instruction
Sets t1 to 1 if t2 is less than zero, otherwise to 0.
Forms  sltz ,   
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. 
 .text
li t0, -1
# t0=-1; sltz writes 1 to t2.
sltz t2, t0