Speculative execution for java hardware accelerator

Details Speculative execution for java hardware accelerator Speculative execution for java hardware accelerator

2007-07-10

2007-07-10

An, Meng-Al T. (Department: 2194)

Electrical computers and digital processing systems: virtual mac

Virtual machine task or process management

C712S209000, C712S229000, C712S233000, C712S234000, C712S237000, C712S239000

Reexamination Certificate

active

10259704

ABSTRACT:
Conditional branch bytecodes are processed by a Virtual Machine Interpreter (VMI) hardware accelerator that utilizes a branch prediction scheme to determine whether to speculatively process bytecodes while waiting for the CPU to return a condition control variable. The VMI assumes the branch condition will be fulfilled if a conditional branch bytecode calls for a backward jump and that the branch condition will not be fulfilled if a conditional branch bytecode calls for a forward jump. Alternatively, the VMI makes an assumption only if a conditional branch bytecode calls for a backward jump or the VMI assumes that the branch condition will be fulfilled whenever it processes a conditional branch bytecode. The VMI only speculatively processes bytecodes that are easily reversible, and suspends speculative processing of bytecodes upon encountering a bytecode that is not easily reversible. If a VMI assumption is invalidated, any speculatively processed bytecodes are reversed.

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