split ssa updating code out to its own helper function. Don't bother

[oota-llvm.git] / lib / Transforms / Scalar / TailRecursionElimination.cpp

diff --git a/lib/Transforms/Scalar/TailRecursionElimination.cpp b/lib/Transforms/Scalar/TailRecursionElimination.cpp
index 371725467a24e0803223de17f7776c2425e1b254..23514fd51be238a98bb8dddfae3288df367229d4 100644 (file)
--- a/lib/Transforms/Scalar/TailRecursionElimination.cpp
+++ b/lib/Transforms/Scalar/TailRecursionElimination.cpp
@@ -60,6 +60,7 @@
 #include "llvm/Pass.h"
 #include "llvm/Analysis/CaptureTracking.h"
 #include "llvm/Analysis/InlineCost.h"
+#include "llvm/Analysis/InstructionSimplify.h"
 #include "llvm/Analysis/Loads.h"
 #include "llvm/Support/CallSite.h"
 #include "llvm/Support/CFG.h"
@@ -72,7 +73,9 @@ STATISTIC(NumAccumAdded, "Number of accumulators introduced");
 namespace {
   struct TailCallElim : public FunctionPass {
     static char ID; // Pass identification, replacement for typeid
-    TailCallElim() : FunctionPass(ID) {}
+    TailCallElim() : FunctionPass(ID) {
+      initializeTailCallElimPass(*PassRegistry::getPassRegistry());
+    }
 
     virtual bool runOnFunction(Function &F);
 
@@ -88,7 +91,7 @@ namespace {
 
 char TailCallElim::ID = 0;
 INITIALIZE_PASS(TailCallElim, "tailcallelim",
-                "Tail Call Elimination", false, false);
+                "Tail Call Elimination", false, false)
 
 // Public interface to the TailCallElimination pass
 FunctionPass *llvm::createTailCallEliminationPass() {
@@ -175,7 +178,7 @@ bool TailCallElim::runOnFunction(Function &F) {
       PHINode *PN = ArgumentPHIs[i];
 
       // If the PHI Node is a dynamic constant, replace it with the value it is.
-      if (Value *PNV = PN->hasConstantValue()) {
+      if (Value *PNV = SimplifyInstruction(PN)) {
         PN->replaceAllUsesWith(PNV);
         PN->eraseFromParent();
       }