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In this paper, we evaluate two different approaches for the compiler-based parallelisation of a C program for MPEG-2 decoding. The first approach experiments with a commercial auto-parallelising compiler for exploiting coarse-grain parallelism on a Silicon Graphics Power Chal- lenge, while the second approach experiments with a simple assembly code scheduler for exploiting instruction-level parallelism. Results ob- tained through the high-level auto-parallelisation of the code are disap- pointing, far from those that can be achieved through manual paralleli- sation. On the other hand, better results are achieved when exploiting instruction-level parallelism; the corresponding compiler technology ap- pears to be more efficient.

Evaluation of two compiler-based approaches for the parallelisation of an MPEG-2 decoder