The CC-RH adds the following characters as reserved words to implement the expanded function. These words are similar to the C language keywords, and cannot be used as a label or variable name.

Reserved words that are added by the CC-RH are listed below.

_Bool, __bsh, __bsw, __caxi, __clr1, __DI, __EI, __fp16, __halt, __hsw, inline, __ldlw, __ldsr, __ldsr_rh, __mul32, __mul32u, __nop, __not1, __satadd, __satsub, __sch0l, __sch0r, __sch1l, __sch1r, __set1, __set_il, __set_il_rh, __stcw, __stsr, __stsr_rh, __synce, __synci, __syncm, __syncp

All names that include two underscores (__) are also invalid as label or variable names.