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IBM developerWorks: DAISY: an open-source JIT compiler for large machines

Dec 03, 2000, 12:06 (0 Talkback[s])
(Other stories by Maya Stodte)

"DAISY, the open-source software for binary translation research, is being released by IBM's Watson Research Center. DAISY's dynamic compilation and 16-wide VLIW put the project at the forefront of compiler techniques and architectural features. Maya Stodte takes a closer look at DAISY and its core development team."

"Emulation projects like DAISY are born when binary translation and just-in-time compilers meet together with a set of core architectural features. Although Transmeta uses a similar approach, their proprietary product only runs on a much narrower underlying machine. (And it's not open source anyway!) With user-transparency, 64 general purpose registers, and program parallelism, DAISY can make translation to VLIW and EPIC a piece of cake. Well, almost."

"The Dynamically Architected Instruction Set from Yorktown (DAISY) translates the binary code of a source architecture to the binary code of a VLIW or EPIC machine by emulating the existing architecture (such as PowerPC) on an underlying processor, which is hidden from the user. As a just-in-time compiler, DAISY looks at the code at run-time and picks out which operations to run in parallel with the target architecture. Because this process is transparent to the user, the user sees only the source architecture instruction set. Fragments of the source architecture code are translated, scheduled, and optimized just-in-time for the target architecture to operate."

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