Developer Guide and Reference

Contents

_fxsave()

Saves the states of x87 FPU, MMX, XMM, and MXCSR registers to memory.

Syntax

extern void _fxsave(void *mem);
Arguments
mem
A memory reference to
FXSAVE
area. The 512-bytes memory addressed by the reference must be 16-bytes aligned.
Description
Saves the states of
x87 FPU
,
MMX
,
XMM
, and
MXCSR
registers to memory. This intrinsic maps to
FXSAVE
instruction.

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