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Paper of IMPACT - Cited Greater than 100 Times
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Publication Year: |
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1988
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Authors |
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Pohua P. Chang, Wen-mei Hwu
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Published: |
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Proceeding MICRO 21 Proceedings of the 21st annual workshop on Microprogramming and microarchitecture, 1988
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Abstract: |
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Microcode optimization
techniques such as code scheduling and resource allocation can benefit
significantly by reducing uncertainties in program control flow. A trace
selection algorithm with profiling information reduces the
uncertainties in program control flow by identifying sequences of
frequently invoked basic blocks as traces. These traces are treated as
sequential codes for optimization purposes. Optimization based on traces
is especially useful when the code size is large and the control
structure is complicated enough to defeat hand optimizations. However,
most of the experimental results reported to date are based on small
benchmarks with simple control structures.
For different trace selection algorithms, we report the
distribution of control transfers categorized according to their
potential impact on the microcode optimizations. The experimental
results are based on ten C application programs which exhibit large code
size and complicated control structure. The measured data for each
program is accumulated across a large number of input files to ensure
the reliability of the result. All experiments are performed
automatically using our IMPACT C compiler which contains integrated
profiling and analysis tools.
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