From c03e9a1040a975670a9c94e94d37dd3a940e0cd5 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Tue, 27 Jan 2009 19:04:30 +0000
Subject: [PATCH] Simplify findNonImmUse; return the result using the return
 value instead of via a by-reference argument. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63118 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86ISelDAGToDAG.cpp | 30 ++++++++++++++----------------
 1 file changed, 14 insertions(+), 16 deletions(-)

diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp
index c5a6edd87a7..54b04ecabc6 100644
--- a/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -249,30 +249,30 @@ static SDNode *findFlagUse(SDNode *N) {
   return NULL;
 }
 
-/// findNonImmUse - Return true by reference in "found" if "Use" is an
-/// non-immediate use of "Def". This function recursively traversing
-/// up the operand chain ignoring certain nodes.
-static void findNonImmUse(SDNode *Use, SDNode* Def, SDNode *ImmedUse,
-                          SDNode *Root, bool &found,
+/// findNonImmUse - Return true if "Use" is a non-immediate use of "Def".
+/// This function recursively traverses up the operand chain, ignoring
+/// certain nodes.
+static bool findNonImmUse(SDNode *Use, SDNode* Def, SDNode *ImmedUse,
+                          SDNode *Root,
                           SmallPtrSet<SDNode*, 16> &Visited) {
-  if (found ||
-      Use->getNodeId() < Def->getNodeId() ||
+  if (Use->getNodeId() < Def->getNodeId() ||
       !Visited.insert(Use))
-    return;
-  
-  for (unsigned i = 0, e = Use->getNumOperands(); !found && i != e; ++i) {
+    return false;
+
+  for (unsigned i = 0, e = Use->getNumOperands(); i != e; ++i) {
     SDNode *N = Use->getOperand(i).getNode();
     if (N == Def) {
       if (Use == ImmedUse || Use == Root)
         continue;  // We are not looking for immediate use.
       assert(N != Root);
-      found = true;
-      break;
+      return true;
     }
 
     // Traverse up the operand chain.
-    findNonImmUse(N, Def, ImmedUse, Root, found, Visited);
+    if (findNonImmUse(N, Def, ImmedUse, Root, Visited))
+      return true;
   }
+  return false;
 }
 
 /// isNonImmUse - Start searching from Root up the DAG to check is Def can
@@ -287,9 +287,7 @@ static void findNonImmUse(SDNode *Use, SDNode* Def, SDNode *ImmedUse,
 /// its chain operand.
 static inline bool isNonImmUse(SDNode *Root, SDNode *Def, SDNode *ImmedUse) {
   SmallPtrSet<SDNode*, 16> Visited;
-  bool found = false;
-  findNonImmUse(Root, Def, ImmedUse, Root, found, Visited);
-  return found;
+  return findNonImmUse(Root, Def, ImmedUse, Root, Visited);
 }