optimization_parameter

Intel® C++ Compiler Classic Developer Guide and Reference

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ID 767249

Date 12/16/2022

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optimization_parameter

Passes certain information about a function to the optimizer.

Syntax

Linux and macOS:

#pragma intel optimization_parameter target_arch=<CPU>

#pragma intel optimization_parameter inline-max-total-size=n

#pragma intel optimization_parameter inline-max-per-routine=n

Windows:

#pragma [intel] optimization_parameter target_arch=<CPU>

#pragma [intel] optimization_parameter inline-max-total-size=n

#pragma [intel] optimization_parameter inline-max-per-routine=n

Arguments

target_arch=<CPU>

For the list of CPUs, see compiler options -m (or /arch) and [Q]x.

inline-max-per-routine=n

Specifies the maximum number of times the inliner may inline into the routine. n is one of the following:

A non-negative integer constant that specifies the maximum number of times the inliner may inline into the function. If you specify zero, no inlining is done into the function.
The keyword unlimited, which means that there is no limit to the number of times the inliner may inline into the function.

For more information, see option [Q]inline-max-per-routine.

inline-max-total-size=n

Specifies how much larger a function can normally grow when inline expansion is performed. n is one of the following:

A non-negative integer constant that specifies the permitted increase in the function's size when inline expansion is performed. If you specify zero, no inlining is done into the function.
The keyword unlimited, which means that there is no limit to the size a function may grow when inline expansion is performed.

For more information, see option [Q]inline-max-total-size.

Description

The intel optimization_parameter target_arch pragma controls the -m (or /arch) option settings at the function level, overriding the option values specified at the command-line.

Place #pragma intel optimization_parameter target_arch=<CPU> at the head of a function to get the compiler to target that function for a specified instruction set. The pragma works like the -m (or /arch) and [Q]x options, but applies only to the function before which it is placed.

The pragmas intel optimization_parameter inline-max-total-size=n and intel optimization_parameter inline-max-per-routine=n specify information used during inlining into a function.

Examples

This example shows targeting code for Intel® Advanced Vector Extensions (Intel® AVX) processors:

For C++: 
icc -mAVX foo.c   // on Linux andmacOS
 -mAVX foo.c   // on Linux and macOS

This example code targets just the function bar for Intel® AVX processors, regardless of the command line options used:

#pragma intel optimization_parameter target_arch=AVX
void bar() { ... }

Parent topic: Intel-Specific Pragma Reference

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optimization_parameter

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