# PHV error on if condition **URL:** \ **Category:** Getting Started with P4\ **Created:** [July 2, 2022, 3:39pm UTC](https://forum.p4.org/t/phv-error-on-if-condition/397 "2022-07-02T15:39:20Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Big\_Blue\_Tuna\_Fish](https://avatars.discourse-cdn.com/v4/letter/b/ebca7d/32.png) [@Big\_Blue\_Tuna\_Fish](https://forum.p4.org/u/Big_Blue_Tuna_Fish)\ **Post date:** [July 2, 2022, 3:39pm UTC](https://forum.p4.org/t/phv-error-on-if-condition/397/1 "2022-07-02T15:39:21Z")
Hello, I am having following error while compiling .p4 program on Tofino model: error: : condition too complex, limit of 4 bytes + 12 bits of PHV input exceeded if (a - b)\>0){ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ I have no clue of what’s causing this error, can anyone give some advice please? Thanks in advance. ---
**Author:** ![andyfingerhut](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.p4.org/andyfingerhut/32/17_2.png) [@andyfingerhut](https://forum.p4.org/u/andyfingerhut)\ **Post date:** [July 3, 2022, 6:17pm UTC](https://forum.p4.org/t/phv-error-on-if-condition/397/2 "2022-07-03T18:17:10Z")
For questions about Tofino and its P4 compiler and run time, if you are an academic member you should ask via a forum at the Intel Connectivity Research Program [Advance Networking in the Intel® Connectivity Research Program](https://intel.com/icrp) If you are a commercial Tofino user, you should ask via the support channels provided to you as a commercial user. ---
**Author:** ![Faris](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.p4.org/faris/32/134_2.png) [@Faris](https://forum.p4.org/u/Faris)\ **Post date:** [July 4, 2022, 3:09pm UTC](https://forum.p4.org/t/phv-error-on-if-condition/397/3 "2022-07-04T15:09:28Z")
it seems there is an error in your syntax, you are missing a parenthesis maybe it should be: if ( (a - b) \> 0 ) { … }