mtune

Performs optimizations for specific processors.

IDE Equivalent

Windows: None

Linux: Optimization > Optimize for Intel processor

Mac OS X: None

Architectures

IA-32, Intel® 64 architectures

Syntax

Linux and Mac OS X:

-mtune=processor

Windows:

None

Arguments

processor

Is the processor for which the compiler should perform optimizations. Possible values are:

generic	Generates code for the compiler's default behavior.
core2	Optimizes for the Intel® Core™ 2 processor family, including support for MMX™, Intel® SSE, SSE2, SSE3 and SSSE3 instruction sets.
pentium	Optimizes for Intel® Pentium® processors.
pentium-mmx	Optimizes for Intel® Pentium® with MMX technology.
pentiumpro	Optimizes for Intel® Pentium® Pro, Intel Pentium II, and Intel Pentium III processors.
pentium4	Optimizes for Intel® Pentium® 4 processors.
pentium4m	Optimizes for Intel® Pentium® 4 processors with MMX technology.

Default

generic

Code is generated for the compiler's default behavior.

Description

This option performs optimizations for specific processors.

The resulting executable is backwards compatible and generated code is optimized for specific processors. For example, code generated with -mtune=pentium4 will run correctly on Core2 processors, but it might not run as fast as if it had been generated using -mtune=core2.

The following table shows on which architecture you can use each value.

	Architecture
`processor` Value	IA-32 architecture	Intel® 64 architecture
generic	X	X
core2	X	X
pentium	X
pentium-mmx	X
pentiumpro	X
pentium4	X
pentium4m	X

Optimization Notice
Intel® Compiler includes compiler options that optimize for instruction sets that are available in both Intel® and non-Intel microprocessors (for example SIMD instruction sets), but do not optimize equally for non-Intel microprocessors. In addition, certain compiler options for Intel® Compiler are reserved for Intel microprocessors. For a detailed description of these compiler options, including the instruction sets they implicate, please refer to "Intel® Compiler User and Reference Guides > Compiler Options". Many library routines that are part of Intel® Compiler are more highly optimized for Intel microprocessors than for other microprocessors. While the compilers and libraries in Intel® Compiler offer optimizations for both Intel and Intel-compatible microprocessors, depending on the options you select, your code and other factors, you likely will get extra performance on Intel microprocessors. While the paragraph above describes the basic optimization approach for Intel® Compiler, with respect to Intel's compilers and associated libraries as a whole, Intel® Compiler 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 Intel® Streaming SIMD Extensions 2 (Intel® SSE2), Intel® Streaming SIMD Extensions 3 (Intel® SSE3), and Supplemental Streaming SIMD Extensions 3 (Intel® 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. Intel recommends that you evaluate other compilers to determine which best meet your requirements.

Optimization Notice

Intel® Compiler includes compiler options that optimize for instruction sets that are available in both Intel® and non-Intel microprocessors (for example SIMD instruction sets), but do not optimize equally for non-Intel microprocessors. In addition, certain compiler options for Intel® Compiler are reserved for Intel microprocessors. For a detailed description of these compiler options, including the instruction sets they implicate, please refer to "Intel® Compiler User and Reference Guides > Compiler Options". Many library routines that are part of Intel® Compiler are more highly optimized for Intel microprocessors than for other microprocessors. While the compilers and libraries in Intel® Compiler offer optimizations for both Intel and Intel-compatible microprocessors, depending on the options you select, your code and other factors, you likely will get extra performance on Intel microprocessors.

While the paragraph above describes the basic optimization approach for Intel® Compiler, with respect to Intel's compilers and associated libraries as a whole, Intel® Compiler 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 Intel® Streaming SIMD Extensions 2 (Intel® SSE2), Intel® Streaming SIMD Extensions 3 (Intel® SSE3), and Supplemental Streaming SIMD Extensions 3 (Intel® 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.

Intel recommends that you evaluate other compilers to determine which best meet your requirements.

Alternate Options

-mtune

Linux: -mcpu (this is a deprecated option)

Mac OS X: None

Windows: None