Intel® C++ Compiler Classic Developer Guide and Reference

ID 767249
Date 12/16/2022
Public

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Document Table of Contents

align

Determines whether variables and arrays are naturally aligned.

Architecture Restrictions

Only available on IA-32 architecture

Syntax

Linux:

-align

-noalign

macOS:

-align

-noalign

Windows:

None

Arguments

None

Default

-noalign

Variables and arrays are aligned according to the gcc model, which means they are aligned to 4-byte boundaries.

Description

This option determines whether variables and arrays are naturally aligned. Option -align forces the following natural alignment:

Type

Alignment

double

8 bytes

long long

8 bytes

long double

16 bytes

If you are not interacting with system libraries or other libraries that are compiled without -align, this option can improve performance by reducing misaligned accesses.

This option can also be specified as -m[no-]align-double. The options are equivalent.

CAUTION:

If you are interacting with compatible libraries, this option can improve performance by reducing misaligned accesses. However, if you are interacting with noncompatible libraries or libraries that are compiled without option -align, your application may not perform as expected.

IDE Equivalent
None
Alternate Options

None