Using Intel's valarray Implementation

Using valarray in Source Code

To use valarrays in your source code, include the valarray header file, <valarray>. The <valarray> header file is located in the path <installdir>/perf_header.

The example code below shows a valarray addition operation (+) specialized through use of Intel's implementation of valarray:

#include <valarray>
void test( )
{
	std::valarray<float> vi(N), va(N);
	…
	vi = vi + va;  //array addition
	…
}

Compiling valarray Source Code

To compile your valarray source code, the compiler option, /Quse-intel-optimized-headers (for Windows*) or -use-intel-optimized-headers (for Linux* and OS X*), is used to include the required valarray header file and all the necessary IPP library files.

The following examples illustrate how to compile and link a program to include the Intel valarray replacement header file and link with the Intel® IPP libraries. Refer to the Intel® IPP documentation for details.

In the following examples, "merged" libraries refers to using a static library that contains all the CPU-specific variants of the library code.

Windows* OS examples:

The following command line performs a one-step compilation for a system based on IA-32 architecture, running Windows OS:

icl /Quse-intel-optimized-headers source.cpp

The following command lines perform separate compile and link steps for a system based on IA-32 architecture, running Windows OS:

DLL (dynamic):

icl /Quse-intel-optimized-headers /c source.cpp

icl source.obj /Quse-intel-optimized-headers

Merged (static):

icl /Quse-intel-optimized-headers /c source.cpp
icl source.obj /Quse-intel-optimized-headers  

Linux* OS examples:

The following command line performs a one-step compilation for a system based on Intel® 64 architecture, running Linux OS:

icpc -use-intel-optimized-headers source.cpp

The following command lines perform separate compile and link steps for a system based on Intel® 64 architecture, running Linux OS:

so (dynamic):

icpc -use-intel-optimized-headers -c source.cpp

icpc source.o -use-intel-optimized-headers

Merged (static):

icpc -use-intel-optimized-headers -c source.cpp

icpc source.o -use-intel-optimized-headers