From: Evan Cheng <evan.cheng@apple.com>
Date: Fri, 28 Sep 2012 21:23:26 +0000 (+0000)
Subject: GlobalDCE should be run at -O2 / -Os to eliminate unused dtor, etc. rdar://9142819
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f5fdc14df9914969bf56315cd3be8a3b3822a22e;p=oota-llvm.git

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164850 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/IPO/PassManagerBuilder.cpp b/lib/Transforms/IPO/PassManagerBuilder.cpp
index c81b333813e..9e328b9ac97 100644
--- a/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -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);
 }