I'm writing a program using Intel intrinsics. I want to use _mm_permute_pd intrinsic, which is only available on CPUs with AVX. For CPUs without AVX I can use _mm_shuffle_pd but according to the specs it is much slower than _mm_permute_pd. Do the header files for Intel intrinsics define constants that allow me to distinguish whether AVX is supported so that I can write sth like this:
#ifdef __IS_AVX_SUPPORTED__ // is there sth like this defined?
// use _mm_permute_pd
# else
// use _mm_shuffle_pd
#endif
? I have found this tutorial, which shows how to perform a runtime check but I need to do a static, compile-time check for the current machine.
I assume you are using Intel C++ Compiler. In this case - yes, there are such macros: Intel C++ Compiler Reference Guide: __AVX__, __AVX2__.
P.S. Be aware that if you compile you application with AVX instruction set enabled it will fail on CPUs not supporting AVX. If you are going to distribute your software as source code package and compile on target machine - this is may be a viable solution. Otherwise you should check for AVX dynamically.
P.P.S. There are several options for ICC. Take a look at the following compiler options and also references from it to other.
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