Method for reducing processor cycles used for global offset tabl

Details Method for reducing processor cycles used for global offset tabl Method for reducing processor cycles used for global offset tabl

1995-12-14

1998-08-18

Voeltz, Emanuel Todd

Boots, shoes, and leggings

395705, 395685, 3642804, G06F 945

Patent

active

057970149

ABSTRACT:
A process for compiling shared library source code into libraries in which the global offset table location is calculated only when a cross module boundary function call is made. The compiler process allocates a single global offset table pointer and then pre-appends a word to each function entry point containing the offset from that function entry point to the global offset table pointer. A calling module accesses the global offset table pointer and loads a global offset table register based on the offset and function entry point. Pointer logic instructions are inserted before pointer based branches using instruction cycles that would otherwise be lost to a pipeline stall in the preferred architecture.

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Crowe, M., "Dynamic Compilation in the Unix Environment", Software Practice and Experience, vol. 17(7), 455-467, Jul. 1987.
McAuliffe, M et al., "A Trace-Based Simulation of Pointer Swizzling Techniques", IEEE Data Engineering, 1995 11th International Conference, pp. 52-61, Mar. 1995.
Dewhurst, S., "Flexible Symbol Table Structures for Compiling C++", Software Practice and Experience, vol. 17(8), 503-512, Aug. 1995.

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