From f2158a8ef06c87dc979b47e98dd2e8d8493c11ff Mon Sep 17 00:00:00 2001
From: Robert Lougher <rob.lougher@gmail.com>
Date: Wed, 20 Mar 2019 19:08:18 +0000
Subject: Resubmit r356511 "[TailCallElim] Add tailcall elimination pass to LTO
 pipelines"

Failing LLD tests have been fixed in r356593.

llvm-svn: 356594
---
 llvm/lib/Passes/PassBuilder.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'llvm/lib/Passes')

diff --git a/llvm/lib/Passes/PassBuilder.cpp b/llvm/lib/Passes/PassBuilder.cpp
index 2baff899010..ba0d6c2bd68 100644
--- a/llvm/lib/Passes/PassBuilder.cpp
+++ b/llvm/lib/Passes/PassBuilder.cpp
@@ -1185,6 +1185,10 @@ PassBuilder::buildLTODefaultPipeline(OptimizationLevel Level, bool DebugLogging,
   // Break up allocas
   FPM.addPass(SROA());
 
+  // LTO provides additional opportunities for tailcall elimination due to
+  // link-time inlining, and visibility of nocapture attribute.
+  FPM.addPass(TailCallElimPass());
+
   // Run a few AA driver optimizations here and now to cleanup the code.
   MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
 
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