Re: Compiler support for Intel-MMX?

Yong-Ke YOUNG Kenneth wrote:
> Is there compiler that supports dissembling into MMX instructions?
> More precisely, if I have e.g. a vector dot product that I think will
> reap significant benefit if I utilize the MMX instruction set, do I
> have to code by hand or is there a compiler who will do it for me?


    From 1996, Intel tried to persuade compiler vendors to start using
the "intrinsics" approach for MMX. The intrinsics are something
between the direct C support and inlined assembly: you have a set of C
"functions" that can be inlined into MMX (or other processor
extravaganza) instructions. You can ask Koby Gottlieb from Intel
Israel (gottlieb@iil.intel.com) what are the compilers that use
intrinsics for MMX. As far as I know, the only compiler that uses MMX
intrinsics is Intel's own icl (a plug-in for MSVC), look at
http://developer.intel.com/design/perftool/icl24/.


    Michael
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