# qopenmp-simd, Qopenmp-simd

Enables or disables OpenMP* SIMD compilation.

## Syntax

Linux: | -qopenmp-simd -qno-openmp-simd

macOS: | -qopenmp-simd -qno-openmp-simd

Windows: | /Qopenmp-simd /Qopenmp-simd-

## Arguments

None

## Default

-qopenmp-simd or /Qopenmp-simd | OpenMP* SIMD compilation is enabled if option O2 or higher is in effect. OpenMP* SIMD compilation is always disabled at optimization levels of O1 or lower. When option O2 or higher is in effect, OpenMP SIMD compilation can only be disabled by specifying option -qno-openmp-simd or /Qopenmp-simd-. It is not disabled by specifying option -qno-openmp or /Qopenmp-.

## Description

This option enables or disables OpenMP* SIMD compilation.

You can use this option if you want to enable or disable the SIMD support with no impact on other OpenMP features. In this case, no OpenMP runtime library is needed to link and the compiler does not need to generate OpenMP runtime initialization code.

If you specify this option with the [q or Q]openmp option, it can impact other OpenMP features.

## IDE Equivalent

None

## Alternate Options

None

## Example

Consider the following:

    -qno-openmp -qopenmp-simd    ! Linux or macOS*
    /Qopenmp- /Qopenmp-simd      ! Windows

The above is equivalent to specifying only [q or Q]openmp-simd. In this case, only SIMD support is provided, the OpenMP* library is not linked, and only the !$OMP directives related to SIMD are processed.

Consider the following:

    -qopenmp -qopenmp-simd       ! Linux or macOS*
    /Qopenmp /Qopenmp-simd       ! Windows

In this case, SIMD support is provided, the OpenMP library is linked, and OpenMP runtime initialization code is generated. Note that when you specify [q or Q]openmp, it implies [q or Q]openmp-simd.

Parent topic: OpenMP* Options and Parallel Processing Options

## See Also

qopenmp, Qopenmp compiler option
O compiler option