System for fast trap generation by creation of possible trap mas

Details System for fast trap generation by creation of possible trap mas System for fast trap generation by creation of possible trap mas

1996-06-17

1998-03-17

Ellis, Richard L.

395565, G06F 900

Patent

active

057297290

ABSTRACT:
An improved method and apparatus for ordering traps in a multiscalar design to avoid pipeline delays. Execution units which generate their traps earlier in the pipeline are used to build a number of possible enable masks, for indicating which instructions should complete, using the ordering information available from the different execution units. The enable masks cover the different possibilities of trap or no trap for the execution units which produce later traps. The traps from the execution units providing a later trap indication then select from the possible enable masks depending upon whether or not a trap is indicated by such second group of execution units. The enable mask is then used to enable or disable the destination registers used by the different execution units for that group of instructions.

REFERENCES:
patent: 3883851 (1975-05-01), Drake et al.
patent: 5193158 (1993-03-01), Kinney et al.
patent: 5237700 (1993-08-01), Johnson et al.
patent: 5341482 (1994-08-01), Cutler et al.
patent: 5481685 (1996-01-01), Nguyen et al.

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