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Intel Tests Code Compression
By Tom R. Halfhill

Intel Labs has demonstrated a compile-time code-compression technology in which a processor unpacks the compressed program at run time. The ultimate goal is to cut silicon costs by reducing the amount of on-chip memory.

Although Intel calls the technology "direct compressed execution," the compressed program is actually decompressed on the fly before execution. It differs from other code-compression techniques (such as ARM's Thumb) that replace 32-bit instructions with 16-bit opcodes. Instead of using a modified instruction set, programmers write, compile, and link their code as usual, then employ a special utility to compress the binary file. The executable file shrinks by as much as 33%.

Because the packed code is decompressed and executed on the fly, not unpacked into memory, the processor needs much less code storage. This scheme can achieve the same goals as a 16-bit instruction set without further complicating an already complex x86 instruction-set architecture. In 1998, IBM introduced a similar technology called CodePack for the PowerPC architecture, but it failed to catch on.

http://www.youtube.com/watch?v=XcyGix9UGFQ
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