Developer Guide and Reference

Contents

Ofast

Sets certain aggressive options to improve the speed of your application.

Syntax

Linux:
-Ofast
macOS:
-Ofast
Windows:
None
Arguments
None
Default
OFF
The aggressive optimizations that improve speed are not enabled.
Description
This option improves the speed of your application.
It sets compiler options
-O3
,
-no-prec-div
, and -fp-model fast=2.
On Linux* systems, this option is provided for compatibility with gcc.
Alternate Options
None

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804