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authorAndreas Hansson <andreas.hansson@arm.com>2012-08-28 14:30:31 -0400
committerAndreas Hansson <andreas.hansson@arm.com>2012-08-28 14:30:31 -0400
commitd53d04473e0d6ca1765f1117072eec59187a7f7b (patch)
treed336db3bfb308b14ec5bba88e8f4ddee1dde8899 /src/cpu/o3/decode.cc
parentd14e5857c7e1ee053fb4eb448c4776d7c985c5b2 (diff)
downloadgem5-d53d04473e0d6ca1765f1117072eec59187a7f7b.tar.xz
Clock: Rework clocks to avoid tick-to-cycle transformations
This patch introduces the notion of a clock update function that aims to avoid costly divisions when turning the current tick into a cycle. Each clocked object advances a private (hidden) cycle member and a tick member and uses these to implement functions for getting the tick of the next cycle, or the tick of a cycle some time in the future. In the different modules using the clocks, changes are made to avoid counting in ticks only to later translate to cycles. There are a few oddities in how the O3 and inorder CPU count idle cycles, as seen by a few locations where a cycle is subtracted in the calculation. This is done such that the regression does not change any stats, but should be revisited in a future patch. Another, much needed, change that is not done as part of this patch is to introduce a new typedef uint64_t Cycle to be able to at least hint at the unit of the variables counting Ticks vs Cycles. This will be done as a follow-up patch. As an additional follow up, the thread context still uses ticks for the book keeping of last activate and last suspend and this should probably also be changed into cycles as well.
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