Assigning free register to unmaterialized predicate in...

Details Assigning free register to unmaterialized predicate in... Assigning free register to unmaterialized predicate in...

2008-03-25

2008-03-25

Kim, Kenneth S. (Department: 2111)

Electrical computers and digital processing systems: processing

Processing control

Branching

C712S234000, C717S151000, C717S159000

Reexamination Certificate

active

07350061

ABSTRACT:
Described is a method that identifies a predicate expression representing conditions in predicated assembly language instructions that determine a direction of a conditional branch instruction. The predicate expression is employed to enable a transformation to be made that causes the conditional branch instruction to trigger, or execute, when an opposite condition is true. A method is directed to producing a binary-level conditional branch reversal within a binary program on a computer architecture that supports a predicated execution. The method includes obtaining a predicate expression representing a condition that influences a direction of program flow of the binary-level conditional branch to be reversed, determining a binary-level transformation that causes the binary-level conditional branch to be triggered when an opposite condition is true, and modifying the binary-level conditional branch with the determined binary-level transformation, wherein the binary-level conditional branch is reversed.

REFERENCES:
patent: 5471593 (1995-11-01), Branigin
patent: 5999738 (1999-12-01), Schlansker et al.
patent: 6446258 (2002-09-01), McKinsey et al.
patent: 6754812 (2004-06-01), Abdallah et al.
patent: 2003/0023959 (2003-01-01), Park

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