Some instructions and commands are not colored in TIGCC, I think it's the same thing fo GCC4TI :

Instructions : abcd, chk, nbcd, reset, sbcd, stop, tas, trapv
Commands : xdef or include (I think it's xdef, but I've added it manually, so I'm not sure).

This is true for GNU as coloration, but I think it's also true for GNU as coloration.

ps : I have already reported that to Kevin Kofler for (K)TIGCC.