Electrical computers and digital processing systems: processing – Processing control – Mode switch or change
Reexamination Certificate
2005-06-18
2008-08-12
Treat, William M. (Department: 2181)
Electrical computers and digital processing systems: processing
Processing control
Mode switch or change
C712S024000
Reexamination Certificate
active
07412591
ABSTRACT:
An apparatus for switchable conditional execution in a VLIW processor is provided, comprising one or more decoders, one or more ALU with control units, and a register file. The decoder loads and decodes instructions from a fetch unit for decoding and sending the decoded instructions to the ALU with control units for execution. The register file stores and forwards the results on result buses to the decoders. The execution of a VLIW instruction includes a fetch stage, a decode stage, plural execution stages and a write-back stage. The invention has the features of approximate ASIC timing by conditional write-back with the compiler support for the conditional write-back, condition resolved just before write-back, software selective conditional issue and conditional write-back modes, and without hardware interlock/dependence checking for the VLIW processor.
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Kuo Hsien-Feng
Ma Yung-Cheng
Wang Chi-Lung
Wang Tengh-Yih
Industrial Technology Research Institute
Treat William M.
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