From: Dan Gohman <gohman@apple.com>
Date: Tue, 20 Apr 2010 14:46:25 +0000 (+0000)
Subject: Don't iterate through the whole block just to find the PHI nodes.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=3f1403f14e45a862ff97c14d80a1daf28518722a;p=oota-llvm.git

Don't iterate through the whole block just to find the PHI nodes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101900 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp b/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
index 10b0ee40360..704b63356a7 100644
--- a/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
+++ b/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
@@ -211,13 +211,10 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
 
     // Create Machine PHI nodes for LLVM PHI nodes, lowering them as
     // appropriate.
-    const PHINode *PN;
     DebugLoc DL;
-    for (BasicBlock::const_iterator
-           I = BB->begin(), E = BB->end(); I != E; ++I) {
-
-      PN = dyn_cast<PHINode>(I);
-      if (!PN || PN->use_empty()) continue;
+    for (BasicBlock::const_iterator I = BB->begin();
+         const PHINode *PN = dyn_cast<PHINode>(I); ++I) {
+      if (PN->use_empty()) continue;
 
       unsigned PHIReg = ValueMap[PN];
       assert(PHIReg && "PHI node does not have an assigned virtual register!");