Methods and apparatus to support conditional execution in a...

Details Methods and apparatus to support conditional execution in a... Methods and apparatus to support conditional execution in a...

2006-12-05

2006-12-05

Treat, William M. (Department: 2181)

Electrical computers and digital processing systems: processing

Processing architecture

Long instruction word

Reexamination Certificate

active

07146487

ABSTRACT:
General purpose flags (ACFs) are defined and encoded utilizing a hierarchical one-, two- or three-bit encoding. Each added bit provides a superset of the previous functionality. With condition combination, a sequential series of conditional branches based on complex conditions may be avoided and complex conditions can then be used for conditional execution. ACF generation and use can be specified by the programmer. By varying the number of flags affected, conditional operation parallelism can be widely varied, for example, from mono-processing to octal-processing in VLIW execution, and across an array of processing elements (PE)s. Multiple PEs can generate condition information at the same time with the programmer being able to specify a conditional execution in one processor based upon a condition generated in a different processor using the communications interface between the processing elements to transfer the conditions. Each processor in a multiple processor array may independently have different units conditionally operate based upon their ACFs.

REFERENCES:
patent: 6041399 (2000-03-01), Terada et al.
Mahlke et al., “Effective Compiler Support for Predicated Execution Using the Hyperblock”, Proceedings of the 25th Annual Symposium on Microarchitecture, 1992, MICRO 25, Dec. 1-4, 1992, pp. 45-54.

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