Advances in Computers, Volume 92 by Ali Hurson PDF

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Atlas uses AMA (atlas multiadaptive) predictor [48], a more aggressive correlated value prediction than SM and Trace, to avoid broadcasting and snooping of the register values. The thread identification based on loop iterations (as in SM) or on instruction traces (as in Trace) provides a good control and data predictability, but they experience severe load imbalance and coverage problems. However, extracting threads on load and store operations (as in Atlas) resolves these problems by keeping threads small and improving control predictability on fixed intervals.

Radulović et al. 1 Thread Identification Support and Speculation Scope Thread Identification CMP Support Speculation Scope Multiscalar [14] Compiler-supported Basic block, multiple basic blocks, loop bodies, entire loops, and entire function invocations Multiplex [8] Compiler-supported Basic block, multiple basic blocks, loop bodies, entire loops, and entire function invocations SM [16] Hardware-supported Loops only MP98 (Merlot) [18] Compiler-/hardware- Loops and basic blocks supported MAJC [17] Compiler-supported Loops and method boundaries Trace [15] Hardware-supported Traces (dynamic instruction sequences) IACOMA [9] Binary annotation tool Loops only Atlas [35] Hardware-supported Around memory references NEKO [22] Compiler-supported Basic block, multiple basic blocks, loop bodies, entire loops, and entire function invocations Pinot [23] Binary parallelizing tool Loops, function calls, and basic blocks Mitosis [19] Compiler-supported Any pair of basic blocks a wide spectrum from a basic block to entire subprogram call.

Then, if the value is not found in its own LRF, the RVT is checked to find the closest predecessor thread that has a copy of the requested register value. If there is no predecessor thread that has the requested register value, the GRF will be a supplier. Each TU also has the register validation store (RVS) to store the copies of register values that are read for the first time by a speculative thread but not produced by it. The register values generated by the p-slice and used by the speculative thread are also stored into RVS.

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