# Gr

Makes __fastcall the default calling convention.

## Architecture Restrictions

Only available on IA-32 architecture

## Syntax

Linux: | None

macOS: | None

Windows: | /Gr

## Arguments

None

## Default

OFF | The default calling convention is __cdecl

## Description

This option makes __fastcall the default calling convention.

## IDE Equivalent

Visual Studio: Advanced > Calling Convention

Eclipse: None

Xcode: None

## Alternate Options

None

Parent topic: Code Generation Options

## See Also

C C++ Calling Conventions