Hello! I want to know if the length of key for the match kind of range has constraints? Because, when I use a 32bit field, the following error will occur:
error: : Currently in p4c, the table test_0 cannot perform a range match on key egress::eg_md.data as the key does not fit in under 5 PHV nibbles
Hi,
I believe the constratins vary from target to target (software targets and hardware (ASIC) targets). This seems a question for the Intel forum. Have you tried to ask it there? See a link here for the forum: PHV error on if condition - #2 by andyfingerhut
In general terms, software switches are more flexible than hardware targets, but with great flexibility comes, not as great, line rate processing capability 
Cheers,
Thank you for your answer！I will ask the intel forum. Thank you very much.