From: Teresa Johnson <tejohnson@google.com>
Date: Tue, 11 Aug 2015 16:26:41 +0000 (+0000)
Subject: Enable EliminateAvailableExternally pass in the LTO pipeline.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=84ee0a28453206b0b3ecd83c1d18d57c9aeb6e54;p=oota-llvm.git

Enable EliminateAvailableExternally pass in the LTO pipeline.

Summary:
For LTO we need to enable this pass in the LTO pipeline,
as it is skipped during the "-flto -c" compile step (when PrepareForLTO is
set).

Reviewers: rnk

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11919

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244622 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/IPO/PassManagerBuilder.cpp b/lib/Transforms/IPO/PassManagerBuilder.cpp
index a4a1852de30..9f58b49288a 100644
--- a/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -556,6 +556,9 @@ void PassManagerBuilder::addLateLTOOptimizationPasses(
   // Delete basic blocks, which optimization passes may have killed.
   PM.add(createCFGSimplificationPass());
 
+  // Drop bodies of available externally objects to improve GlobalDCE.
+  PM.add(createEliminateAvailableExternallyPass());
+
   // Now that we have optimized the program, discard unreachable functions.
   PM.add(createGlobalDCEPass());