qopt-jump-tables, Qopt-jump-tables

Enables or disables generation of jump tables for switch statements. This feature is only available for ifort.

Syntax

Linux:

-qopt-jump-tables=keyword

-qno-opt-jump-tables

macOS:

-qopt-jump-tables=keyword

-qno-opt-jump-tables

Windows:

/Qopt-jump-tables:keyword

/Qopt-jump-tables-

Arguments

keyword

Is the instruction for generating jump tables. Possible values are:

never	Tells the compiler to never generate jump tables. All switch statements are implemented as chains of if-then-elses. This is the same as specifying -qno-opt-jump-tables (Linux* and macOS) or /Qopt-jump-tables- (Windows).
default	The compiler uses default heuristics to determine when to generate jump tables.
large	Tells the compiler to generate jump tables up to a certain pre-defined size (64K entries).
n	Must be an integer. Tells the compiler to generate jump tables up to `n` entries in size.

Default

-qopt-jump-tables=default
or /Qopt-jump-tables:default

The compiler uses default heuristics to determine when to generate jump tables for switch statements.

Description

This option enables or disables generation of jump tables for switch statements. When the option is enabled, it may improve performance for programs with large switch statements.

IDE Equivalent

None

Alternate Options

None