Otimizações para acesso a memoria em tradução binaria dinamica / Optimization for memory acess in dynamic binary translation

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Dynamic binary translators or DBTs, are programs designed to execute, in a target architecture, binary programs from different architectures, performing the translation of the binary program during the execution time. They can also be used to improve the performance of native programs for a specific architecture. DBTs can collect profile information from the application during runtime, this skill is impossible for a static compiler. This kind of information can be used by the DBTs to perform new kinds of optimizations, not possible in the static compiler, due to few information about the program s behavior, or does not know the regions of the code that are more important to optimize, in detriment of others. DBTs spend time translating the binary code, so is very important that the translation and the optimization process, both be as fast as possible, to the impact in the overall execution time, be the minimum possible. In this way, for a dynamic binary translator, is essential to know where to apply the optimizations, that is, find out what regions of the translated code are really important and that can generate performance improvements. When these regions are identified, the DBTs apply code optimizations in these regions to compensate the time spend to translate the binary program and even improve the performance of the translated aplication. Memory access is a expensive operation for programs, to avoid it in a dynamic environment may result in performance improvement in the translated program, compensating the time spend to translate the binary. In this work, we investigate the performance improvement that can be achieved in a dynamic translation environment when we optimize the memory access that the translated program performs inside the regions selected for optimization. The optimization process tries, when possible, to avoid access to the main computer memory, transforming them into registers access of the target architecture. Many code optimizations need data flow information to perform code transformations, in this work we also investigate a new way to improve the data flow analysis that are performed in constraint regions of code by the dynamic binary translator. The results show that optimize the memory access produce small gains, about 2%. When we try to improve the data flow information, we have discovered that when we are looking for available registers, we can find that almost 25% of the investigated registers are empty and can be used for optimizations

ASSUNTO(S)

otimização computer architecture alocação de recursos optimization compiladores (computadores) arquitetura de computador resource allocation compilers (computers)

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