# _writefsbase_u32(), _writefsbase_u64()

Write the value to the FS base register. Both intrinsics are mapped to `WRFSBASE` instruction.

## Syntax

extern void _writefsbase_u32(int 32 val);

extern void _writefsbase_u64(unsigned __int64 val);

## Arguments

val

  the value to be written to the FS base register

## Description

These intrinsics write the given value to the FS segment base register.

Parent topic: Intrinsics that Allow Reading from and Writing to the FS Base and GS Base Registers