# _fxrstor64()

Restores the states of x87 FPU, MMX, XMM, and MXCSR registers from memory.

## Syntax

extern void _fxrstor64(void *mem);

## Arguments

mem

  A memory reference to `FXSAVE` area. The 512-bytes memory addressed by the reference must be 16-bytes aligned.

## Description

Restores the states of x87 FPU, MMX, XMM, and MXCSR registers from memory. This intrinsic maps to FXRSTOR64 instruction.

Parent topic: Intrinsics for Saving and Restoring the Extended Processor States