From bbb528f1892b2ae78cf08a3e699deb4e0481b413 Mon Sep 17 00:00:00 2001
From: Matthias Braun <matze@braunis.de>
Date: Sat, 13 Feb 2016 04:35:31 +0000
Subject: LiveIntervalAnalysis: Remove LiveVariables requirement

This requirement was a huge hack to keep LiveVariables alive because it
was optionally used by TwoAddressInstructionPass and PHIElimination.
However we have AnalysisUsage::addUsedIfAvailable() which we can use in
those passes.

llvm-svn: 260806
---
 llvm/lib/CodeGen/PHIElimination.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'llvm/lib/CodeGen/PHIElimination.cpp')

diff --git a/llvm/lib/CodeGen/PHIElimination.cpp b/llvm/lib/CodeGen/PHIElimination.cpp
index 2c937926d0a..0472378aeee 100644
--- a/llvm/lib/CodeGen/PHIElimination.cpp
+++ b/llvm/lib/CodeGen/PHIElimination.cpp
@@ -121,6 +121,7 @@ INITIALIZE_PASS_END(PHIElimination, "phi-node-elimination",
                     "Eliminate PHI nodes for register allocation", false, false)
 
 void PHIElimination::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.addUsedIfAvailable<LiveVariables>();
   AU.addPreserved<LiveVariables>();
   AU.addPreserved<SlotIndexes>();
   AU.addPreserved<LiveIntervals>();
-- 
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