While searching for the CodePlay Vector C compiler, I stumbled across Vector Pascal...
<blockquote>

Vector Pascal is a language targeted at SIMD instruction-sets such as the MMX and the AMD 3d Now

It currently supports :
* the 486,
* the AMD Opteron 64 bit processor,
* the Pentium,
* the Athlon
* the Sony Playstation 2 Emotion Engine see report here ( PDF File )!
* the Intel P3 and P4 processors.

It has a SIMD compiler which supports parallel vector operations, loop unrolling, common sub expression removal etc. It is implemented in Java, and is available for download in source or binary.

</blockquote>
The port to PS2 makes an interesting read, so make sure you check it out.