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I made a quick cross check with information in the SWOG (Software Optimization Guide). The port assignments look consistent. A few of the latency values are slightly different from the SWOG, e.g. WriteFRcp --> 6, WriteFSqrt --> 29 and WriteCvt* --> 4 seem to be suggested instead. Others are in better position to describe how to use llvm performance framework. --mev, Mike Vermeulen