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

ID 767251
Date 7/13/2023
Public

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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