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  • Seems to me you want to look not only at execution counts of such instructions, but at the overall fraction of time they account for because, for example, suppose they take 50% of the time, and you can reduce that part to negligible, you've only gotten a factor of 2 speedup. Commented Jun 4, 2010 at 16:17
  • Execution time is not important in this specific case. I'm not profiling for code optimization. Commented Jun 6, 2010 at 16:55