[ixp1200] Jump instruction in C compiler

Hello everyone, Problem has it that the C compiler does not support jump instruction of ixp1200. Thus the switch-case statement will not gain benefit from the jump instruction. As we know jump instruction with 'target' option token could easily depict the switch-case scenery which means a better run time performance. But the C compiler does not allow this instruction. Currently I try br=byte instruction instead, but the performance still not match. If there are any methods I can generate the jump instruction (with target token) in C environment? Thanks Zhangxi Tan Dept. of CS Tsinghua Univ.