Developer Guide and Reference

Contents

_readfsbase_u32(), _readfsbase_u64()

Read the value of the FS base register. Both intrinsics are mapped to
RDFSBASE
instruction.

Syntax

extern unsigned int _readfsbase_u32();
extern unsigned __int64 _readfsbase_u64();
Description
These intrinsics read the value of the FS base register.
Returns
The value of the FS base segment register.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804