From 00a4fe48ac7d984c960f1c63b50d75668df27284 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 7 Nov 2004 00:39:26 +0000
Subject: [PATCH] This is V9 specific, move it there.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17545 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../Scalar/DecomposeMultiDimRefs.cpp          | 136 ------------------
 1 file changed, 136 deletions(-)
 delete mode 100644 lib/Transforms/Scalar/DecomposeMultiDimRefs.cpp

diff --git a/lib/Transforms/Scalar/DecomposeMultiDimRefs.cpp b/lib/Transforms/Scalar/DecomposeMultiDimRefs.cpp
deleted file mode 100644
index 40e1be5d461..00000000000
--- a/lib/Transforms/Scalar/DecomposeMultiDimRefs.cpp
+++ /dev/null
@@ -1,136 +0,0 @@
-//===- llvm/Transforms/DecomposeMultiDimRefs.cpp - Lower array refs to 1D -===//
-// 
-//                     The LLVM Compiler Infrastructure
-//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-// 
-//===----------------------------------------------------------------------===//
-//
-// DecomposeMultiDimRefs - Convert multi-dimensional references consisting of
-// any combination of 2 or more array and structure indices into a sequence of
-// instructions (using getelementpr and cast) so that each instruction has at
-// most one index (except structure references, which need an extra leading
-// index of [0]).
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Constants.h"
-#include "llvm/Constant.h"
-#include "llvm/Instructions.h"
-#include "llvm/BasicBlock.h"
-#include "llvm/Pass.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/Support/Debug.h"
-using namespace llvm;
-
-namespace {
-  Statistic<> NumAdded("lowerrefs", "# of getelementptr instructions added");
-
-  struct DecomposePass : public BasicBlockPass {
-    virtual bool runOnBasicBlock(BasicBlock &BB);
-  };
-  RegisterOpt<DecomposePass> X("lowerrefs", "Decompose multi-dimensional "
-                               "structure/array references");
-}
-
-// runOnBasicBlock - Entry point for array or structure references with multiple
-// indices.
-//
-bool DecomposePass::runOnBasicBlock(BasicBlock &BB) {
-  bool changed = false;
-  for (BasicBlock::iterator II = BB.begin(); II != BB.end(); )
-    if (GetElementPtrInst *gep = dyn_cast<GetElementPtrInst>(II++)) // pre-inc
-      if (gep->getNumIndices() >= 2)
-        changed |= DecomposeArrayRef(gep); // always modifies II
-  return changed;
-}
-
-FunctionPass *llvm::createDecomposeMultiDimRefsPass() {
-  return new DecomposePass();
-}
-
-static inline bool isZeroConst (Value *V) {
-  return isa<Constant> (V) && (cast<Constant>(V)->isNullValue());
-}
-
-// Function: DecomposeArrayRef()
-//  
-// For any GetElementPtrInst with 2 or more array and structure indices:
-// 
-//      opCode CompositeType* P, [uint|ubyte] idx1, ..., [uint|ubyte] idxN
-// 
-// this function generates the following sequence:
-// 
-//      ptr1   = getElementPtr P,         idx1
-//      ptr2   = getElementPtr ptr1,   0, idx2
-//      ...
-//      ptrN-1 = getElementPtr ptrN-2, 0, idxN-1
-//      opCode                 ptrN-1, 0, idxN  // New-MAI
-// 
-// Then it replaces the original instruction with this sequence,
-// and replaces all uses of the original instruction with New-MAI.
-// If idx1 is 0, we simply omit the first getElementPtr instruction.
-// 
-// On return: BBI points to the instruction after the current one
-//            (whether or not *BBI was replaced).
-// 
-// Return value: true if the instruction was replaced; false otherwise.
-// 
-bool llvm::DecomposeArrayRef(GetElementPtrInst* GEP) {
-  if (GEP->getNumIndices() < 2
-      || (GEP->getNumIndices() == 2
-          && isZeroConst(GEP->getOperand(1)))) {
-    DEBUG (std::cerr << "DecomposeArrayRef: Skipping " << *GEP);
-    return false;
-  } else {
-    DEBUG (std::cerr << "DecomposeArrayRef: Decomposing " << *GEP);
-  }
-
-  BasicBlock *BB = GEP->getParent();
-  Value *LastPtr = GEP->getPointerOperand();
-  Instruction *InsertPoint = GEP->getNext(); // Insert before the next insn
-
-  // Process each index except the last one.
-  User::const_op_iterator OI = GEP->idx_begin(), OE = GEP->idx_end();
-  for (; OI+1 != OE; ++OI) {
-    std::vector<Value*> Indices;
-    
-    // If this is the first index and is 0, skip it and move on!
-    if (OI == GEP->idx_begin()) {
-      if (isZeroConst (*OI))
-        continue;
-    }
-    else // Not the first index: include initial [0] to deref the last ptr
-      Indices.push_back(Constant::getNullValue(Type::LongTy));
-
-    Indices.push_back(*OI);
-
-    // New Instruction: nextPtr1 = GetElementPtr LastPtr, Indices
-    LastPtr = new GetElementPtrInst(LastPtr, Indices, "ptr1", InsertPoint);
-    ++NumAdded;
-  }
-
-  // Now create a new instruction to replace the original one
-  //
-  const PointerType *PtrTy = cast<PointerType>(LastPtr->getType());
-
-  // Get the final index vector, including an initial [0] as before.
-  std::vector<Value*> Indices;
-  Indices.push_back(Constant::getNullValue(Type::LongTy));
-  Indices.push_back(*OI);
-
-  Value *NewVal = new GetElementPtrInst(LastPtr, Indices, GEP->getName(),
-                                        InsertPoint);
-
-  // Replace all uses of the old instruction with the new
-  GEP->replaceAllUsesWith(NewVal);
-
-  // Now remove and delete the old instruction...
-  BB->getInstList().erase(GEP);
-
-  return true;
-}
-
-- 
2.34.1