Speed up instsimplify by about 10-15% by not bothering to retry

[oota-llvm.git] / lib / Transforms / Utils / LCSSA.cpp

diff --git a/lib/Transforms/Utils/LCSSA.cpp b/lib/Transforms/Utils/LCSSA.cpp
index 193dd3895da3cfa43997a0c9a5e1ee097071145c..b2e5fa6d7e3ad4d86f7b2cf1dfd0021013ea4223 100644 (file)
--- a/lib/Transforms/Utils/LCSSA.cpp
+++ b/lib/Transforms/Utils/LCSSA.cpp
@@ -47,7 +47,9 @@ STATISTIC(NumLCSSA, "Number of live out of a loop variables");
 namespace {
   struct LCSSA : public LoopPass {
     static char ID; // Pass identification, replacement for typeid
-    LCSSA() : LoopPass(ID) {}
+    LCSSA() : LoopPass(ID) {
+      initializeLCSSAPass(*PassRegistry::getPassRegistry());
+    }
 
     // Cached analysis information for the current function.
     DominatorTree *DT;
@@ -65,10 +67,7 @@ namespace {
       AU.setPreservesCFG();
 
       AU.addRequired<DominatorTree>();
-      AU.addPreserved<DominatorTree>();
-      AU.addPreserved<DominanceFrontier>();
       AU.addRequired<LoopInfo>();
-      AU.addPreserved<LoopInfo>();
       AU.addPreservedID(LoopSimplifyID);
       AU.addPreserved<ScalarEvolution>();
     }
@@ -92,10 +91,7 @@ namespace {
 char LCSSA::ID = 0;
 INITIALIZE_PASS_BEGIN(LCSSA, "lcssa", "Loop-Closed SSA Form Pass", false, false)
 INITIALIZE_PASS_DEPENDENCY(DominatorTree)
-INITIALIZE_PASS_DEPENDENCY(DominanceFrontier)
 INITIALIZE_PASS_DEPENDENCY(LoopInfo)
-INITIALIZE_PASS_DEPENDENCY(LoopSimplify)
-INITIALIZE_PASS_DEPENDENCY(ScalarEvolution)
 INITIALIZE_PASS_END(LCSSA, "lcssa", "Loop-Closed SSA Form Pass", false, false)
 
 Pass *llvm::createLCSSAPass() { return new LCSSA(); }