Transcription of Tips for Optimizing C/C++ Code - Clemson University
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Tips for Optimizing C/C++ Code - Clemson University
Tips for Optimizing C/C++ Ahmdal s Law:Speedup=timeoldtimenew=1(1 funccost)+funccost/funcspeedup Wheref unccostis the percentage of the program runtime used by the functionf unc, andf uncspeedupisthe factor by which you speedup the function. Thus, if you optimize the functionT riangleIntersect(), which is 40% of the runtime, so that it runstwice as fast, your program will run 25% faster (1(1 )+ ). This means infrequently used code ( , the scene loader) probably should be optimized little (if at all). This is often phrased as: make the common case fast and the rare case correct.
• Where funccost is the percentage of the program runtime used by the function func, and funcspeedup is the factor by which you speedup the function. • Thus, if you optimize the function TriangleIntersect(), which is 40% of the runtime, so that it runs twice as fast, your program will run 25% faster (1 (1−0.4)+0.4/2 = 0.8 = 1.25).
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