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

ID 767251
Date 3/31/2023
Public

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Document Table of Contents

qopt-matmul, Qopt-matmul

Enables or disables a compiler-generated Matrix Multiply (matmul) library call.

Syntax

Linux:

-qopt-matmul

-qno-opt-matmul

macOS:

None

Windows:

/Qopt-matmul

/Qopt-matmul-

Arguments

None

Default

-qno-opt-matmul
or /Qopt-matmul-

The matmul library call optimization does not occur unless this option is enabled or certain other compiler options are specified (see below).

Description

This option enables or disables a compiler-generated Matrix Multiply (MATMUL) library call.

The [q or Q]opt-matmul option tells the compiler to identify matrix multiplication loop nests (if any) and replace them with a matmul library call for improved performance. The resulting executable may improve performance on Intel® microprocessors.

NOTE:

This option is dependent upon the OpenMP* library. If your product does not support OpenMP, this option will have no effect.

This option has no effect unless option O2 or higher is set.

NOTE:

Many routines in the MATMUL library are more highly optimized for Intel® microprocessors than for non-Intel microprocessors.

IDE Equivalent

Visual Studio: Optimization > Enable Matrix Multiply Library Call

Alternate Options

None

See Also