Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG12B/EFM32GG12B530F512GM64/CAN1/IF0IFC#0x0
Message Object Interrupt Flag Clear Register
Clear MESSAGE Interrupt Flag
https://github.com/cmsis-svd/cmsis-svd-data