Is it OK to directly compare the size of two numbers in FPGA?

Defined 2 Constant

parameter signed [15:0] hight_threshold = 500;
parameter signed [15:0] low_threshold = -500;

Compare with a register

reg signed [15:0]data,

When data by -80 When using the following judgment, it is no good , Always true

if(data > hight_threshold || data < low_threshold)

Finally, it's normal to change to the following one

if($signed(data) > $signed(hight_threshold) || $signed(data) < $signed(low_threshold)

This kind of judgment must use $signed Define signed direction .