fast

Maximizes speed across the entire program.

IDE Equivalent

Windows: General > Optimization
Linux: None

Architectures

IA-32, Intel® EM64T, Intel® Itanium® architecture

Syntax

Arguments

None

Default

Description

This option maximizes speed across the entire program.

It sets the following options:

• On Itanium®-based systems:
  Windows: /O3 and /Qipo
  Linux: -ipo, -O3, and -static
• On IA-32 and Intel® EM64T systems:
  Windows: /O3, /Qipo, /Qprec-div-, and /QxP
  Linux: -ipo, -O3, -no-prec-div, -static, and -xP
  
  Note that programs compiled with the -xP (Linux) or /QxP (Windows) option will detect non-compatible processors and generate an error message during execution.

On IA-32 and Intel® EM64T systems, the -xP (Linux) or /QxP (Windows) option that is set by the fast option cannot be overridden by other command line options.  If you specify the fast option and a different processor-specific option, such as -xN (Linux) or /QxN (Windows), the compiler will issue a warning that explains the -xP or /QxP option cannot be overridden.

On these systems, if you want to get the benefit of the fast option and use a different processor-specific option, specify the options set by fast individually on the command line, omitting the -xP or /QxP option.
For example, if you want to use the processor-specific option -xW (Linux) or /QxW (Windows), do not specify the fast option.  Instead, specify the following options:

• On Linux systems: -O3 -ipo -no-prec-div -static -xW
• On Windows systems: /O3 /Qipo /Qprec-div- /QxW

Note

The options set by the fast option may change from release to release.

Alternate Options

None