From 71d3934badcf3f161164b3f75c01328f39c3a31a Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 30 Apr 2002 20:52:49 +0000
Subject: [PATCH] Remove unneccesary pass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2420 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/HoistPHIConstants.cpp | 86 ----------------------------
 1 file changed, 86 deletions(-)
 delete mode 100644 lib/Transforms/HoistPHIConstants.cpp

diff --git a/lib/Transforms/HoistPHIConstants.cpp b/lib/Transforms/HoistPHIConstants.cpp
deleted file mode 100644
index bdf2efc952b..00000000000
--- a/lib/Transforms/HoistPHIConstants.cpp
+++ /dev/null
@@ -1,86 +0,0 @@
-//===- llvm/Transforms/HoistPHIConstants.h - Normalize PHI nodes ------------=//
-//
-// HoistPHIConstants - Remove literal constants that are arguments of PHI nodes
-// by inserting cast instructions in the preceeding basic blocks, and changing
-// constant references into references of the casted value.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Transforms/HoistPHIConstants.h"
-#include "llvm/iPHINode.h"
-#include "llvm/iOther.h"
-#include "llvm/BasicBlock.h"
-#include "llvm/Function.h"
-#include "llvm/Pass.h"
-
-typedef std::pair<BasicBlock *, Value*> BBConstTy;
-typedef std::map<BBConstTy, CastInst *> CachedCopyMap;
-
-static Value *NormalizePhiOperand(PHINode *PN, Value *CPV,
-                                  BasicBlock *Pred, CachedCopyMap &CopyCache) {
-  // Check if we've already inserted a copy for this constant in Pred
-  // Note that `copyCache[Pred]' will create an empty vector the first time
-  //
-  CachedCopyMap::iterator CCI = CopyCache.find(BBConstTy(Pred, CPV));
-  if (CCI != CopyCache.end()) return CCI->second;
-  
-  // Create a copy instruction and add it to the cache...
-  CastInst *Inst = new CastInst(CPV, CPV->getType());
-  CopyCache.insert(std::make_pair(BBConstTy(Pred, CPV), Inst));
-    
-  // Insert the copy just before the terminator inst of the predecessor BB
-  assert(Pred->getTerminator() && "Degenerate BB encountered!");
-  Pred->getInstList().insert(Pred->getInstList().end()-1, Inst);
-  
-  return Inst;
-}
-
-
-//---------------------------------------------------------------------------
-// Entry point for normalizing constant args in PHIs
-//---------------------------------------------------------------------------
-
-static bool doHoistPHIConstants(Function *M) {
-  CachedCopyMap Cache;
-  bool Changed = false;
-  
-  for (Function::iterator BI = M->begin(), BE = M->end(); BI != BE; ++BI) {
-    std::vector<PHINode*> phis;          // normalizing invalidates BB iterator
-      
-    for (BasicBlock::iterator II = (*BI)->begin(); II != (*BI)->end(); ++II) {
-      if (PHINode *PN = dyn_cast<PHINode>(*II))
-        phis.push_back(PN);
-      else
-        break;                      // All PHIs occur at top of BB!
-    }
-      
-    for (std::vector<PHINode*>::iterator PI=phis.begin(); PI != phis.end();++PI)
-      for (unsigned i = 0; i < (*PI)->getNumIncomingValues(); ++i) {
-        Value *Op = (*PI)->getIncomingValue(i);
-        
-        if (isa<Constant>(Op)) {
-          (*PI)->setIncomingValue(i,
-                    NormalizePhiOperand((*PI),
-                                        (*PI)->getIncomingValue(i),
-                                        (*PI)->getIncomingBlock(i), Cache));
-          Changed = true;
-        }
-      }
-  }
-  
-  return Changed;
-}
-
-namespace {
-  struct HoistPHIConstants : public FunctionPass {
-    const char *getPassName() const { return "Hoist Constants from PHI Nodes"; }
-
-    virtual bool runOnFunction(Function *F) { return doHoistPHIConstants(F); }
-
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      AU.preservesCFG();
-    }
-  };
-}
-
-Pass *createHoistPHIConstantsPass() { return new HoistPHIConstants(); }
-- 
2.34.1