Intel® C++ Compiler Classic Developer Guide and Reference

ID 767249
Date 7/13/2023
Public
Document Table of 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.