Read e-book online ACM transactions on design automation of electronic systems PDF

By M. R. Greenstreet on formal verification, K-J Le, J. J. Tang, T. C. Huang on BIFEST, V. S. S. Nair on spectral based heuristics, others C. Kern

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This is an approach which does not require any software support. The hardware directly examines virtual addresses generated by the PC, and compares them with the virtual page number part of the CFR. If they match, then the target instruction is in the same page (requiring no translation) and the iL1 lookup is performed as described above. If they do not match, then we force an iTLB lookup. This lookup, in the case of a VI-PT iL1 is done in parallel with the iL1 indexing (incurring an energy cost in the iTLB).

This is not expected to be a problem since this page will be a very low candidate for LRU anyway (and we do this for at most 1 page per application process). If so desired, one could ask the OS to invalidate the CFR if this page has to be really evicted/remapped (just as the entry would be invalidated in the iTLB). Note that CFR is not explicitly available to the application program (either for reading or writing), and it is used directly by the hardware. However, in supervisory mode, the OS will be allowed to read/write the CFR (so that this page is not evicted) and maybe reset/invalidate it.

One solution to the set of equations is: a1 = 1, a2 = 2, a3 = 4, . . , am = 2m−1 , am+1 = 2m − 2, with the right-hand side of Equation (A-9) being: m−1 (2m − 2)(m − 1) − 2i (l + m − 2 − i) = (2m − 1)(m − l − 1) + 1. i=0 Dividing both sides of Equation (A-9) by a1 + am+1 = 2m − 1, we obtain: s1 + · · · + sm + s1 − t1 − · · · − tl ≥ m − l − 1 + 1 . 2m − 1 ACM Transactions on Design Automation of Electronic Systems, Vol. 10, No. 2, April 2005. 226 • A. Cao et al. As the left-hand side of the preceding inequality are all binary variables, we can rewrite it as: s1 + · · · + sm + s1 − t1 − · · · − tl ≥ m − l .

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ACM transactions on design automation of electronic systems (April) by M. R. Greenstreet on formal verification, K-J Le, J. J. Tang, T. C. Huang on BIFEST, V. S. S. Nair on spectral based heuristics, others C. Kern


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