From 6205b21cf5e597e6ecfcc73d70dc5a830c28df02 Mon Sep 17 00:00:00 2001
From: "Duncan P. N. Exon Smith" <dexonsmith@apple.com>
Date: Mon, 12 Jan 2015 19:16:34 +0000
Subject: [PATCH] IR: Separate out recalculateHash(), NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225655 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/IR/Metadata.h |  1 +
 lib/IR/Metadata.cpp        | 24 +++++++++++++-----------
 2 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/include/llvm/IR/Metadata.h b/include/llvm/IR/Metadata.h
index d868c4bdc61..8033a17efd7 100644
--- a/include/llvm/IR/Metadata.h
+++ b/include/llvm/IR/Metadata.h
@@ -731,6 +731,7 @@ class GenericMDNode : public MDNode {
   ~GenericMDNode();
 
   void setHash(unsigned Hash) { MDNodeSubclassData = Hash; }
+  void recalculateHash();
 
 public:
   /// \brief Get the hash, if any.
diff --git a/lib/IR/Metadata.cpp b/lib/IR/Metadata.cpp
index f303b7d8a71..1ae9a96fe46 100644
--- a/lib/IR/Metadata.cpp
+++ b/lib/IR/Metadata.cpp
@@ -484,6 +484,18 @@ void GenericMDNode::resolveCycles() {
   }
 }
 
+void GenericMDNode::recalculateHash() {
+  setHash(hash_combine_range(op_begin(), op_end()));
+#ifndef NDEBUG
+  {
+    SmallVector<Metadata *, 8> MDs(op_begin(), op_end());
+    unsigned RawHash = hash_combine_range(MDs.begin(), MDs.end());
+    assert(getHash() == RawHash &&
+           "Expected hash of MDOperand to equal hash of Metadata*");
+  }
+#endif
+}
+
 void MDNode::dropAllReferences() {
   for (unsigned I = 0, E = NumOperands; I != E; ++I)
     setOperand(I, nullptr);
@@ -545,18 +557,8 @@ void GenericMDNode::handleChangedOperand(void *Ref, Metadata *New) {
     return;
   }
 
-  // Re-calculate the hash.
-  setHash(hash_combine_range(op_begin(), op_end()));
-#ifndef NDEBUG
-  {
-    SmallVector<Metadata *, 8> MDs(op_begin(), op_end());
-    unsigned RawHash = hash_combine_range(MDs.begin(), MDs.end());
-    assert(getHash() == RawHash &&
-           "Expected hash of MDOperand to equal hash of Metadata*");
-  }
-#endif
-
   // Re-unique the node.
+  recalculateHash();
   GenericMDNodeInfo::KeyTy Key(this);
   auto I = Store.find_as(Key);
   if (I == Store.end()) {