I don''t think there is an icmp instruction. However, when I said that there was a signed version of compares, i really meant conditional jump instructions used after a cmp.

jg, jl, jge, gle (and a few more) are for signed numbers
ja, jb, jae, jbe (and a few more) are for unsigned numbers.

And of course, je, jz, jnz and jne work for both.