How sltiu instruction compares negative value?

Archive RISC-V
1

sltiu t1, t0, -6;

Will this instruction compare if t0 < 6 (absolute value) or
will it compare if t0 < 0xfffffffa (ignoring sign) ?

2

When I tested with freedom studio, it seems the second one which makes sense.

3

Immediates are always sign extended. The fact that the instruction is an unsigned compare operation doesn’t change that fact.

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