Intel® C++ Compiler Classic Developer Guide and Reference

ID 767249
Date 12/16/2022
Public

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Document Table of Contents

vec, Qvec

Enables or disables vectorization.

Syntax

Linux:

-vec

-no-vec

macOS:

-vec

-no-vec

Windows:

/Qvec

/Qvec-

Arguments

None

Default

-vec
or /Qvec

Vectorization is enabled if option O2 or higher is in effect.

Description

This option enables or disables vectorization.

To disable vectorization, specify -no-vec (Linux* and macOS) or /Qvec- (Windows*).

To disable interpretation of SIMD pragmas, specify -no-simd (Linux* and macOS) or /Qsimd- (Windows*).

To disable all compiler vectorization, use the "-no-vec -no-simd" (Linux* and macOS) or "/Qvec- /Qsimd-" (Windows*) compiler options. The option -no-vec (and /Qvec-) disables all auto-vectorization, including vectorization of array notation statements. The option -no-simd (and /Qsimd-) disables vectorization of loops that have SIMD pragmas.

NOTE:

Using this option enables vectorization at default optimization levels for both Intel® microprocessors and non-Intel microprocessors. Vectorization may call library routines that can result in additional performance gain on Intel microprocessors than on non-Intel microprocessors. The vectorization can also be affected by certain options, such as /arch (Windows), -m (Linux and macOS), or [Q]x.

IDE Equivalent
None
Alternate Options

None

See Also