Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 9/08/2022
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

simd, Qsimd

Enables or disables compiler interpretation of SIMD directives.This feature is only available for ifort.

Syntax

Linux:

-simd

-no-simd

macOS:

-simd

-no-simd

Windows:

/Qsimd

/Qsimd-

Arguments

None

Default

-simd
or /Qsimd

SIMD directives are enabled.

Description

This option enables or disables compiler interpretation of SIMD directives.

To disable interpretation of SIMD directives, specify -no-simd (Linux* and macOS) or /Qsimd- (Windows*). Note that the compiler may still vectorize loops based on its own heuristics (leading to generation of SIMD instructions) even when -no-simd (or /Qsimd-) is specified.

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 directives.

NOTE:

If you specify option -mia32 (Linux*) or option /arch:IA32 (Windows*), SIMD directives are disabled by default and vector instructions cannot be used. Therefore, you cannot explicitly enable SIMD directives by specifying option [Q]simd.

IDE Equivalent
None
Alternate Options

None

See Also