Developer Guide and Reference

Contents

optimize

Enables or disables optimizations for code after this pragma until another optimize pragma or end of the translation unit.

Syntax

#pragma optimize
(
""
,
on
|
off
)
Arguments
The compiler ignores first argument values. Valid second arguments for
optimize
are:
off
Disables optimization
on
Enables optimization
Description
The
optimize
pragma is used to enable or disable optimizations.
Specifying
#pragma optimize("", off)
disables optimization until either the compiler finds a matching
#pragma optimize("", on)
statement or until the compiler reaches the end of the translation unit.

Examples

Example: Disabling optimization for a single function using the
optimize
pragma
#pragma optimize("", off) alpha() { ... } #pragma optimize("", on) omega() { ... }
In this example, optimizations are disabled for the
alpha()
function but not for the
omega()
function.
Example: Disabling optimization for all functions using the
optimize
pragma
#pragma optimize("", off) alpha() { ... } omega() { ... }
In this example, optimizations are disabled for both the
alpha()
and
omega()
functions.

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