What compilers besides gcc can vectorize code?

问题:

GCC can vectorize loops automatically when certain options are specified and given the right conditions. Are there other compilers widely available that can do the same?

回答1:

ICC

回答2:

llvm can also do it and vector pascal too and one that is not free VectorC. These are just some I remember.

回答3:

Also PGI's compilers.

回答4:

The Mono project, the Open Source alternative to Microsoft's Silverlight project, has added objects that use SIMD instructions. While not a compiler, the Mono CLR is the first managed code system to generate vector operations natively.

回答5:

IBM's xlc can auto-vectorize C and C++ to some extent as well.

回答6:

Actually, in many cases GCC used to be quite worse than ICC for automatic code vectorization, I don't know if it recently improved enough, but I doubt it.

回答7:

VectorC can do this too. You can also specify all target CPU so that it takes advantage of different instruction sets (e.g. MMX, SIMD, SIMD2,...)

回答8:

Visual C++ (I'm using VS2005) can be forced to use SSE instructions. It seems not to be as good as Intel's compiler, but if someone already uses VC++, there's no reason not to turn this option on.

Go to project's properties, Configuration properties, C/C++, Code Generation: Enable Enhanced Instruction Set. Set "Streaming SIMD Instructios" or "Streaming SIMD Instructios 2". You will have to set floating point model to fast. Some other options will have to be changed too, but compiler will tell you about that.

回答9:

Even though this is an old thread, I though I'd add to this list - Visual Studio 11 will also have auto vectorisation.