From d84e806dd4b03fa711ae2665ac1acef646f16c5c Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Tue, 20 Apr 2010 14:50:13 +0000
Subject: [PATCH] Sink this use_empty() check into
 isUsedOutsideOfDefiningBlock.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101902 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp b/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
index 8ca25bb995a..cc9a3d57225 100644
--- a/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
+++ b/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
@@ -124,6 +124,7 @@ void llvm::ComputeValueVTs(const TargetLowering &TLI, const Type *Ty,
 /// PHI nodes or outside of the basic block that defines it, or used by a
 /// switch or atomic instruction, which may expand to multiple basic blocks.
 static bool isUsedOutsideOfDefiningBlock(const Instruction *I) {
+  if (I->use_empty()) return false;
   if (isa<PHINode>(I)) return true;
   const BasicBlock *BB = I->getParent();
   for (Value::const_use_iterator UI = I->use_begin(), E = I->use_end();
@@ -190,7 +191,7 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
 
   for (; BB != EB; ++BB)
     for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I)
-      if (!I->use_empty() && isUsedOutsideOfDefiningBlock(I))
+      if (isUsedOutsideOfDefiningBlock(I))
         if (!isa<AllocaInst>(I) ||
             !StaticAllocaMap.count(cast<AllocaInst>(I)))
           InitializeRegForValue(I);