Rename loop preheaders pass to loop simplify

llvm-svn: 9061

llvm/include/llvm/Transforms/Scalar.h

@@ -232,14 +232,14 @@ void SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum, Pass *P = 0);
 
 //===----------------------------------------------------------------------===//
 //
-// LoopPreheaders pass - Insert Pre-header blocks into the CFG for every
-// function in the module.  This pass updates dominator information, loop
-// information, and does not add critical edges to the CFG.
+// LoopSimplify pass - Insert Pre-header blocks into the CFG for every function
+// in the module.  This pass updates dominator information, loop information,
+// and does not add critical edges to the CFG.
 //
-//   AU.addRequiredID(LoopPreheadersID);
+//   AU.addRequiredID(LoopSimplifyID);
 //
-Pass *createLoopPreheaderInsertionPass();
-extern const PassInfo *LoopPreheadersID;
+Pass *createLoopSimplifyPass();
+extern const PassInfo *LoopSimplifyID;
 
 //===----------------------------------------------------------------------===//
 // 

llvm/lib/Transforms/Scalar/IndVarSimplify.cpp

@@ -199,7 +199,7 @@ namespace {
     
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.addRequired<LoopInfo>();
-      AU.addRequiredID(LoopPreheadersID);
+      AU.addRequiredID(LoopSimplifyID);
       AU.setPreservesCFG();
     }
   };

llvm/lib/Transforms/Scalar/LICM.cpp

@@ -53,7 +53,7 @@ namespace {
     ///
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.setPreservesCFG();
-      AU.addRequiredID(LoopPreheadersID);
+      AU.addRequiredID(LoopSimplifyID);
       AU.addRequired<LoopInfo>();
       AU.addRequired<DominatorTree>();
       AU.addRequired<DominanceFrontier>();  // For scalar promotion (mem2reg)

llvm/lib/Transforms/Scalar/LoopSimplify.cpp

@@ -66,8 +66,8 @@ namespace {
 }
 
 // Publically exposed interface to pass...
-const PassInfo *LoopPreheadersID = X.getPassInfo();
-Pass *createLoopPreheaderInsertionPass() { return new LoopSimplify(); }
+const PassInfo *LoopSimplifyID = X.getPassInfo();
+Pass *createLoopSimplifyPass() { return new LoopSimplify(); }
 
 
 /// runOnFunction - Run down all loops in the CFG (recursively, but we could do

llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp

@@ -27,7 +27,9 @@ namespace {
       AU.addPreserved<ImmediateDominators>();
       AU.addPreserved<DominatorTree>();
       AU.addPreserved<DominanceFrontier>();
-      AU.addPreservedID(LoopPreheadersID);   // No preheaders deleted.
+
+      // No loop canonicalization guarantees are broken by this pass.
+      AU.addPreservedID(LoopSimplifyID);
     }
   };