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GlobalDCE should be run at -O2 / -Os to eliminate unused dtor, etc. rdar://9142819
llvm-svn: 164850
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@ -211,13 +211,12 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
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// FIXME: We shouldn't bother with this anymore.
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MPM.add(createStripDeadPrototypesPass()); // Get rid of dead prototypes
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// GlobalOpt already deletes dead functions and globals, at -O3 try a
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// GlobalOpt already deletes dead functions and globals, at -O2 try a
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// late pass of GlobalDCE. It is capable of deleting dead cycles.
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if (OptLevel > 2)
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if (OptLevel > 1) {
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MPM.add(createGlobalDCEPass()); // Remove dead fns and globals.
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if (OptLevel > 1)
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MPM.add(createConstantMergePass()); // Merge dup global constants
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}
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}
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addExtensionsToPM(EP_OptimizerLast, MPM);
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}
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