# fimf-force-dynamic-target, Qimf-force-dynamic-target

Instructs the compiler to use run-time dispatch in calls to math functions.

## Syntax

Linux: | -fimf-force-dynamic-target[=funclist]

macOS: | -fimf-force-dynamic-target[=funclist]

Windows: | /Qimf-force-dynamic-target[:funclist]

## Arguments

funclist | Is an optional list of one or more math library functions to which the attribute should be applied. If you specify more than one function, they must be separated with commas. Precision-specific variants like sin and sinf are considered different functions, so you would need to use -fimf-dynamic-target=sin,sinf (or /Qimf-dynamic-target:sin,sinf) to specify run-time dispatch for both the single-precision and double-precision sine functions. You also can specify the symbol /f to denote single-precision divides, symbol / to denote double-precision divides, symbol /l to denote extended-precision divides, and symbol /q to denote quad-precision divides. For example, you can specify -fimf-dynamic-target=/ or /Qimf-dynamic-target:/.

## Default

OFF | Run-time dispatch is not forced in math libraries calls. The compiler can choose to call a CPU-specific version of a math function if one is available.

## Description

This option instructs the compiler to use run-time dispatch in calls to math functions. When this option set to ON, it lets you force run-time dispatch in math libraries calls.

By default, when this option is set to OFF, the compiler often optimizes math library calls using the target CPU architecture-specific information available at compile time through the [Q]x and arch compiler options.

If you want to target multiple CPU families with a single application or you prefer to choose a target CPU at run time, you can force run-time dispatch in math libraries by using this option.

Product and Performance Information
Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex. Notice revision #20201201

## IDE Equivalent

None

## Alternate Options

None

Parent topic: Floating-Point Options

## See Also

x, Qx compiler option
arch compiler option
mtune, tune compiler option