If you want to do nothing on MCU, no-operation is used generally.
Additional mnemonics are provided for the preferred forms of no-op, like nop, e_nop, se_nop. (Where the semantics are similar but the binary encoding differ, the standard mnemonic is typically preceded with an e_ to denote a VLE instruction. To distinguish between similar instructions available in both 16- and 32-bit forms under VLE and standard instructions, VLE instructions encoded with 16 bits have an se_ prefix.)
When you compile these code within IDE, you can get the results as below.
The code could run correctly except __asm__ ("nop"). Some MPC5xxx will stop at __asm__ ("nop").