mtune, tune

Syntax

Linux and macOS:

-mtune=processor

Windows:

/tune:processor

Arguments

processor

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

generic	Optimizes code for the compiler's default behavior.
broadwell haswell ivybridge knl sandybridge silvermont skylake	Optimizes code for processors that support the specified Intel® microarchitecture code name. Keywords knl and silvermont are only available on Windows* and Linux* systems.
core-avx2	Optimizes code for processors that support Intel® Advanced Vector Extensions 2 (Intel® AVX2), Intel® AVX, SSE4.2, SSE4.1, SSE3, SSE2, SSE, and SSSE3 instructions.
core-avx-i	Optimizes code for processors that support the RDRND instruction, Intel® Advanced Vector Extensions (Intel® AVX), Intel® SSE4.2, SSE4.1, SSE3, SSE2, SSE, and SSSE3 instructions.
corei7-avx	Optimizes code for processors that support Intel® Advanced Vector Extensions (Intel® AVX), Intel® SSE4.2, SSE4.1, SSE3, SSE2, SSE, and SSSE3 instructions.
corei7	Optimizes code for processors that support Intel® SSE4 Efficient Accelerated String and Text Processing instructions. May also generate code for Intel® SSE4 Vectorizing Compiler and Media Accelerator, Intel® SSE3, SSE2, SSE, and SSSE3 instructions.
atom	Optimizes code for processors that support MOVBE instructions, depending on the setting of option -minstruction (Linux* and OS X) or /Qinstruction (Windows). May also generate code for SSSE3 instructions and Intel® SSE3, SSE2, and SSE instructions.
core2	Optimizes for the Intel® Core™ 2 processor family, including support for MMX™, Intel® SSE, SSE2, SSE3 and SSSE3 instruction sets.
pentium-mmx	Optimizes for Intel® Pentium® with MMX technology.
pentiumpro	Optimizes for Intel® Pentium® Pro, Intel Pentium II, and Intel Pentium III processors.
pentium4m	Optimizes for Intel® Pentium® 4 processors with MMX technology.
pentium-m pentium4 pentium3 pentium	Optimizes code for Intel® Pentium® processors. Value pentium3 is only available on Linux* systems.

Default

generic

Code is generated for the compiler's default behavior.

Description

This option performs optimizations for specific processors but does not cause extended instruction sets to be used (unlike -march).

The resulting executable is backwards compatible and generated code is optimized for specific processors. For example, code generated with -mtune=core2 or /tune:core2 will run correctly on 4th Generation Intel® Core™ processors, but it might not run as fast as if it had been generated using -mtune=haswell or /tune:haswell. Code generated with -mtune=haswell (/tune:haswell) or -mtune=core-avx2 (/tune:core-avx2) will also run correctly on Intel® Core™2 processors, but it might not run as fast as if it had been generated using -mtune=core2 or /tune:core2. This is in contrast to code generated with -march=core-avx2 or /arch:core-avx2, which will not run correctly on older processors such as Intel® Core™2 processors.

Optimization Notice
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

Optimization Notice

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

IDE Equivalent

Visual Studio: Code Generation >Intel Processor Microarchitecture-Specific Optimization

Eclipse: None

Xcode: Code Generation > Intel Processor Microarchitecture-Specific Optimization

Alternate Options

-mtune

Linux: -mcpu (this is a deprecated option)

OS X: None

Windows: None