CONDITIONAL INSTRUCTION EXECUTION VIA EMISSARY INSTRUCTION FOR CONDITION EVALUATION

WIPO Patent Application WO2006086713

A3

Hazard detection is simplified by converting a conditional instruction, operative to perform an operation if a condition is satisfied, into an emissary instruction operative to evaluate the condition and an unconditional base instruction operative to perform the operation. The emissary instruction is executed, while the base instruction is halted. The emissary instruction evaluates the condition and reports the condition evaluation back to the base instruction. Based on the condition evaluation, the base instruction is either launched into the pipeline for execution, or it is discarded (or a NOP, or null instruction, substituted for it). In either case, the dependencies of following instructions may be resolved.

MCILVAINE MICHAEL SCOTT (US)
DIEFFENDERFER JAMES NORRIS (US)
BRIDGES JEFFREY TODD (US)
SARTORIUS THOMAS ANDREW (US)
SMITH RODNEY WAYNE (US)

PCT/US2006/004892

November 16, 2006

February 10, 2006

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QUALCOMM INC (US)
MCILVAINE MICHAEL SCOTT (US)
DIEFFENDERFER JAMES NORRIS (US)
BRIDGES JEFFREY TODD (US)
SARTORIUS THOMAS ANDREW (US)
SMITH RODNEY WAYNE (US)

G06F9/318; G06F9/38

WO2002042902A2

2002-05-30

US6598153B1

2003-07-22

HOLLER A M ED - INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS: "Optimization for a superscalar out-of-order machine", PROCEEDINGS OF THE 29TH. ANNUAL IEEE/ACM INTERNATIONAL SYMPOSIUM ON MICROARCHITECTURE. MICRO-29. PARIS, DEC. 2 - 4, 1996, PROCEEDINGS OF THE ANNUAL IEEE/ACM INTERNATIONAL SYMPOSIUM ON MICROARCHITECTURE. (MICRO), LOS ALAMITOS, IEEE COMP. SOC. PRESS, U, vol. SYMP. 29, 2 December 1996 (1996-12-02), pages 336 - 348, XP010206108, ISBN: 0-8186-7641-8

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