mtune

Performs optimizations for specific processors.

IDE Equivalent

None

Architectures

IA-32, Intel® 64, IA-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.
itanium2	Optimizes for Intel® Itanium® 2 processors.
itanium2-p9000	Optimizes for the Dual-Core Intel® Itanium® 2 processor 9000 series. This option affects the order of the generated instructions, but the generated instructions are limited to Intel® Itanium® 2 processor instructions unless the program uses (executes) intrinsics specific to the Dual-Core Intel® Itanium® 2 processor 9000 series.

Default

generic	On systems using IA-32 and Intel® 64 architectures, code is generated for the compiler's default behavior.
itanium2-p9000	On systems using IA-64 architecture, the compiler optimizes for the Dual-Core Intel® Itanium® 2 processor 9000 series.

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=itanium2-p9000 will run correctly on single-core Itanium® 2 processors, but it might not run as fast as if it had been generated using -mtune=itanium2.

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

	Architecture
`processor` Value	IA-32 architecture	Intel® 64 architecture	IA-64 architecture
generic	X	X	X
core2	X	X
pentium	X
pentium-mmx	X
pentiumpro	X
pentium4	X
pentium4m	X
itanium2			X
itanium2-p9000			X

Alternate Options

-mtune	Linux: -mcpu (this is a deprecated option) Mac OS X: None Windows: None
-mtune=itanium2	Linux: -mcpu=itanium2 (-mcpu is a deprecated option) Mac OS X: None Windows: /G2
-mtune=itanium2-p9000	Linux: -mcpu=itanium2-p9000 (-mcpu is a deprecated option) Mac OS X: None Windows: /G2-p9000