Method and apparatus for NOP folding

Electrical computers and digital processing systems: processing – Dynamic instruction dependency checking – monitoring or... – Commitment control or register bypass

Reexamination Certificate

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Reexamination Certificate

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07111154

ABSTRACT:
Embodiments of an apparatus, method, and system provide for no-operation instruction (“NOP”) folding such that information regarding the presence of a NOP instruction in the instruction stream is folded into a buffer entry for another instruction. Information regarding a target NOP instruction is thus maintained in a buffer entry associated with an instruction other than the target NOP instruction. For at least one embodiment, NOP information is folded into entries of a re-order buffer.

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“PowerPC 603 Risc Microprocessor Technical Summary”, Freescale Semiconductor, 1994, available at http://www.freescale.com/files/32bit/doc/data—sheet/MPC603.pdf.
“Heads and Tails: A Variable-Length Instruction Format Supporting Parallel Fetch and Decode”, Heidi Pan and Krste Asanovic, International Conference on Compilers, Architecture, and Synthesis for Embedded Systems (CASES 2001), Atlanta, GA, Nov. 2001.
“High-Performance Variable-Length Instruction Encodings”, Heidi Pan, M.Eng. Thesis, Massachusetts Institute of Technology, Jun. 2002.
“Instruction Fetch Mechanisms for VLIW Architectures with Compressed Encodings,” Thomas M. Conte, et al., Proceedings of the 29th annual ACM/IEEE international symposium on Microarchitecture, Paris, France, pp. 201-211, 1996.

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