x, Qx

Directs the compiler to generate specialized and optimized code for the processor that executes your program.

IDE Equivalent

Windows: Optimization > Require Intel(R) Processor Extensions

Linux: None

Architectures

IA-32, Intel® EM64T

Syntax

Linux:	-xprocessor
Windows:	/Qxprocessor

Arguments

processor	Is the processor for which you want to target your program. Possible values are:
	K	Code is optimized for Intel® Pentium® III and compatible Intel processors.
	W	Code is optimized for Intel Pentium 4 and compatible Intel processors.
	N	Code is optimized for Intel Pentium 4 and compatible Intel processors. This option also enables new optimizations in addition to Intel processor-specific optimizations.
	B	Code is optimized for Intel Pentium M and compatible Intel processors. This option also enables new optimizations in addition to Intel processor-specific optimizations.
	P	Code is optimized for Intel® Pentium® 4 processors with Streaming SIMD Extensions 3 (SSE3) instruction support. This option also enables new optimizations in addition to Intel processor-specific optimizations.

Default

IA-32 systems: OFF
Intel® EM64T systems: W

On IA-32 systems, no processor-specific code is generated by the compiler. On Intel® EM64T systems, the default is W, which optimizes code for Intel Pentium 4 and compatible Intel processors.

Description

This option directs the compiler to generate specialized and optimized code for the Intel® processor that executes your program. It lets you target your program to run on a specific Intel processor.

The resulting code may contain unconditional use of features that are not supported on other processors.

On Intel® EM64T systems, W and P are the only valid processor values.

You can use more than one of the processor values by combining them. For example, on IA-32 processors, you can specify -xNB (Linux) or /QxNB (Windows) to generate code for Intel® Pentium® 4 processors and Intel Pentium M processors.

Do not use these options if you are executing a program on a non-Intel® processor. If you use these options on a non-compatible processor, the program may fail with an illegal instruction exception or display other unexpected behavior.

In particular, programs compiled with processor values N, B, or P will display a fatal run-time error if they are executed on unsupported processors. For more information, see your Optimizing Applications guide.

Alternate Options

None