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* Add "--log-cache-miss" option to generate a log of cache miss.
- This option must be used with "--ic" and/or "--dc" options
to enable cache simulation.
- This option is useful with "-l" option to understand
which instruction has caused the cache miss.
* Modify log format of cache miss to reduce log size.
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It is nonstandard, and GCC doesn't support it on 32-bit platforms. The
resulting code for MULH[[S]U] is crappier, but that doesn't really matter,
as these instructions are dynamically infrequent.
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the dumb linear search of a set's tag array was far too slow
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