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GlobalDCE should be run at -O2 / -Os to eliminate unused dtor, etc. rdar://9142819

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164850 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2012-09-28 21:23:26 +00:00
parent 21731d876c
commit f5fdc14df9
1 changed files with 3 additions and 4 deletions
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7
lib/Transforms/IPO/PassManagerBuilder.cpp
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@ -211,13 +211,12 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
// FIXME: We shouldn't bother with this anymore.
MPM.add(createStripDeadPrototypesPass()); // Get rid of dead prototypes
// GlobalOpt already deletes dead functions and globals, at -O3 try a
// GlobalOpt already deletes dead functions and globals, at -O2 try a
// late pass of GlobalDCE. It is capable of deleting dead cycles.
if (OptLevel > 2)
if (OptLevel > 1) {
MPM.add(createGlobalDCEPass()); // Remove dead fns and globals.
if (OptLevel > 1)
MPM.add(createConstantMergePass()); // Merge dup global constants
}
}
addExtensionsToPM(EP_OptimizerLast, MPM);
}