International Business Machines Corporation

Compaq Computer Corporation, Inc.

Sven Eric Meier

Robert K Montoye

Anthony Correale, Jr

Derrick R Meyer

Daniel Lawrence Leibholz

James Arthur Farrell

Timothy Charles Fischer

Thomas Anderson Dick

A scannable limited switch dynamic logic (LSDL) circuit including a data input and a data output, a combinational logic circuit in communication with the data input, a pre-charge circuit in communication with the combinational logic circuit, a footer circuit in communication with the combinational logic, a keeper circuit in communication with the combinational logic circuit and the pre-charge circuit, a scan input connected to the data input, a scan input circuit in communication with the scan input, the combinational logic circuit, the pre-charge circuit, and the keeper circuit, a modified inverter circuit in communication with the combinational logic circuit, the pre-charge circuit, the keeper circuit, and the scan input circuit, a parallel gate circuit in communication with the modified inverter circuit, a series gate circuit in communication with the modified inverter circuit and the parallel gate circuit, a feedback inverter connected between an internal node and a feedback node, and an output buffer connected between the internal node and the data output.

Scannable limited switch dynamic logic (LSDL) circuit

A technique for speculatively issuing instructions using an out-of-order processor. A cache miss by a load instruction results in either a reissue of all subsequently issued instructions for an integer instruction stream, or a reissue of only truly dependent instructions for a floating point instruction stream. One version of the technique involves issuing and executing a first instruction, and issuing a second instruction during a speculative time window of the first instruction that occurs after the first instruction is issued. The technique further involves executing the issued second instruction when the first instruction is executed in a first manner, and reissuing the second instruction and executing the reissued second instruction when the first instruction is executed in a second manner that is different than the first manner.

Speculative issue of instructions under a load miss shadow

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Boston, MA, United States of America

Sven Eric Meier