march

Tells the compiler to generate code for a specified CPU.

IDE Equivalent

None

Architectures

IA-32 architecture, Intel® 64 architecture

Syntax

Linux:	-march=cpu
Mac OS:	None
Windows:	None

Arguments

cpu	Is the CPU for which the compiler should generate code. Possible values are:
	pentium3	Generates code for Intel Pentium III processors.
	pentium4	Generates code for Intel Pentium 4 processors.

Default

OFF or
-march=pentium4

On IA-32 systems, the compiler does not generate processor-specific code unless it is told to do so. On systems using Intel® 64 architecture, the compiler generates code for Intel Pentium 4 processors.

Description

This option tells the compiler to generate code for a specified CPU.

Specifying -march=pentium4 sets -mtune=pentium4.

For compatibility, a number of historical cpu values are also supported, but the generated code will not differ from the default.

Alternate Options

-march=pentium3	Linux: -xK Mac OS: None Windows: /QxK
-march=pentium4	Linux: -xW Mac OS: None Windows: /QxW