From 8a19371370c636f38915c3d3f8e5394e3514f23b Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 3 Dec 2009 21:50:58 +0000
Subject: Watch out for PHI instruction with no source operands.

llvm-svn: 90488
---
 llvm/lib/CodeGen/MachineInstr.cpp | 2 ++
 1 file changed, 2 insertions(+)

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

diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp
index ba9be6a8703..2cafbd418f3 100644
--- a/llvm/lib/CodeGen/MachineInstr.cpp
+++ b/llvm/lib/CodeGen/MachineInstr.cpp
@@ -1064,6 +1064,8 @@ bool MachineInstr::isInvariantLoad(AliasAnalysis *AA) const {
 unsigned MachineInstr::isConstantValuePHI() const {
   if (getOpcode() != TargetInstrInfo::PHI)
     return 0;
+  if (getNumOperands() <= 1)
+    return 0;
 
   unsigned Reg = getOperand(1).getReg();
   for (unsigned i = 3, e = getNumOperands(); i < e; i += 2)
-- 
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