From c5bc1525343121689ee319412845e57314325795 Mon Sep 17 00:00:00 2001
From: Chandler Carruth <chandlerc@gmail.com>
Date: Fri, 4 Jul 2014 08:11:38 +0000
Subject: [PATCH] Add an explicit bool operator to SDValue to make it easier to
 test for a non-null node. In particular, this makes it easier to use
 condition variables with SDValues, etc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212323 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/SelectionDAGNodes.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/llvm/CodeGen/SelectionDAGNodes.h b/include/llvm/CodeGen/SelectionDAGNodes.h
index 29c787485ee..5df40671b52 100644
--- a/include/llvm/CodeGen/SelectionDAGNodes.h
+++ b/include/llvm/CodeGen/SelectionDAGNodes.h
@@ -142,6 +142,9 @@ public:
   bool operator<(const SDValue &O) const {
     return std::tie(Node, ResNo) < std::tie(O.Node, O.ResNo);
   }
+  LLVM_EXPLICIT operator bool() const {
+    return Node != nullptr;
+  }
 
   SDValue getValue(unsigned R) const {
     return SDValue(Node, R);