Intel® C++ Compiler Classic Developer Guide and Reference

ID 767249
Date 3/31/2023
Public

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Document Table of Contents

_fxsave64()

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

Syntax

extern void _fxsave64(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 FXSAVE64 instruction.