Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32FG1V/EFR32FG1V131F64GM32/GPIO/IFC#0x0
Interrupt Flag Clear Register
Clear EXT Interrupt Flag
Clear EM4WU Interrupt Flag
https://github.com/cmsis-svd/cmsis-svd-data