http://llvm.org/bugs/show_bug.cgi?id=12742
Bug #: 12742
Summary: Make RegionInfo independent of DominanceFrontier
Product: libraries
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: Global Analyses
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected],
[email protected]
Classification: Unclassified
The last in-tree user of DominanceFrontiers is the RegionInfo analysis. With
Chandler's recent work on a new way to handle partial inlining[1] it may find
its way into the default pipeline eventually and we really don't want to have
the O(n^2) domfrontier computation in there again after all the work to remove
it from other passes. Moving RegionInfo off domfrontier would also allow to
remove it entirely.
RegionInfo uses domfrontier to check if blocks form a SESE region. It really
feels like overkill to use domfrontier for this but I don't see what exactly is
needed to avoid it and only use ordinary dominator trees.
[1]
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120430/142236.html
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