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if your pass runs in a second pass or the main loop,
getanalysisusage should return the pass manager to analyze each function that it should be run on. you should call
doinitialization to finalize that analysis. also it must call
performinitialization to generate an
analysisresult to use in the per-function loop analyses.
performanalysis should be called as part of the main loop analysis to avoid redundant analysis work.
looppass pass subclass will not run if it was not specifically requested for use in the analysis loop. note that the loop pass may not perform any analysis of the function body, as it is not a looping pass, rather a second-pass pass. if the function contains many basic blocks with a single loop, you may want to create a loop pass that contains a single basic block and call
determinedominatortrees to list out the loop’s blocks and call
getanalysisusage to run that analysis on the loop.
looppass subclass which is intended to run as part of the main loop pass pipeline needs to preserve all of the same function analyses that the other loop passes in its pipeline require. to make that easier, a
getloopanalysisusage function is provided by
looputils.h. it can be called within the subclasss
getanalysisusage override to get consistent and correct behavior. analogously,
initialize_pass_dependency(looppass) will initialize this set of function analyses.
if a pass is not invoked, it returns novalid. if a pass returns invalid, the analysis is invalidated and return novalid. novalid indicates that the analysis was invalid, but you may still receive a pass structure. simply check the most recent invalidation. for more information, see how to invalidate analyses .
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