http://llvm.org/bugs/show_bug.cgi?id=2377
Summary: SCEV should be a loop pass
Product: libraries
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Loop Optimizer
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
Because ScalarEvolution is a FunctionPass, it kills the LoopPassManager when it
is run. This creates overhead because it require the re-instantiation of the
LPM, as well as forcing LCSSA to be recomputed repeatedly. As of right now, we
compute LCSSA no less than five times in -std-compile-opts, mostly because of
this. If SCEV were a loop pass, this could probably be reduced to one or two.
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