From 6c3a95dab561ef9747876d14014e965f8688f55b Mon Sep 17 00:00:00 2001
From: Chandler Carruth <chandlerc@gmail.com>
Date: Sun, 28 Jul 2013 06:43:11 +0000
Subject: Thread DataLayout through the callers and into mem2reg. This will be
 useful in a subsequent patch, but causes an unfortunate amount of noise, so I
 pulled it out into a separate patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187322 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Utils/Mem2Reg.cpp                 |  7 +++++--
 lib/Transforms/Utils/PromoteMemoryToRegister.cpp | 21 +++++++++++++--------
 2 files changed, 18 insertions(+), 10 deletions(-)

(limited to 'lib/Transforms/Utils')

diff --git a/lib/Transforms/Utils/Mem2Reg.cpp b/lib/Transforms/Utils/Mem2Reg.cpp
index 61b3965d8f..ebd7db6210 100644
--- a/lib/Transforms/Utils/Mem2Reg.cpp
+++ b/lib/Transforms/Utils/Mem2Reg.cpp
@@ -16,6 +16,7 @@
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Analysis/Dominators.h"
+#include "llvm/IR/DataLayout.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/Transforms/Utils/PromoteMemToReg.h"
@@ -27,6 +28,7 @@ STATISTIC(NumPromoted, "Number of alloca's promoted");
 namespace {
   struct PromotePass : public FunctionPass {
     static char ID; // Pass identification, replacement for typeid
+
     PromotePass() : FunctionPass(ID) {
       initializePromotePassPass(*PassRegistry::getPassRegistry());
     }
@@ -62,6 +64,7 @@ bool PromotePass::runOnFunction(Function &F) {
   bool Changed  = false;
 
   DominatorTree &DT = getAnalysis<DominatorTree>();
+  const DataLayout *DL = getAnalysisIfAvailable<DataLayout>();
 
   while (1) {
     Allocas.clear();
@@ -70,12 +73,12 @@ bool PromotePass::runOnFunction(Function &F) {
     // the entry node
     for (BasicBlock::iterator I = BB.begin(), E = --BB.end(); I != E; ++I)
       if (AllocaInst *AI = dyn_cast<AllocaInst>(I))       // Is it an alloca?
-        if (isAllocaPromotable(AI))
+        if (isAllocaPromotable(AI, DL))
           Allocas.push_back(AI);
 
     if (Allocas.empty()) break;
 
-    PromoteMemToReg(Allocas, DT);
+    PromoteMemToReg(Allocas, DT, DL);
     NumPromoted += Allocas.size();
     Changed = true;
   }
diff --git a/lib/Transforms/Utils/PromoteMemoryToRegister.cpp b/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
index b3eaa1319a..6910180997 100644
--- a/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
+++ b/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
@@ -61,6 +61,8 @@ STATISTIC(NumPHIInsert,     "Number of PHI nodes inserted");
 namespace {
 
 struct AllocaInfo : private InstVisitor<AllocaInfo, bool> {
+  const DataLayout *DL;
+
   SmallVector<BasicBlock *, 32> DefiningBlocks;
   SmallVector<BasicBlock *, 32> UsingBlocks;
   SmallVector<Instruction *, 8> DeadInsts;
@@ -73,6 +75,8 @@ struct AllocaInfo : private InstVisitor<AllocaInfo, bool> {
   Value *AllocaPointerVal;
   DbgDeclareInst *DbgDeclare;
 
+  AllocaInfo(const DataLayout *DL) : DL(DL) {}
+
   void clear() {
     DefiningBlocks.clear();
     UsingBlocks.clear();
@@ -274,6 +278,7 @@ struct PromoteMem2Reg {
   std::vector<AllocaInst *> Allocas;
   DominatorTree &DT;
   DIBuilder DIB;
+  const DataLayout *DL;
 
   /// An AliasSetTracker object to update.  If null, don't update it.
   AliasSetTracker *AST;
@@ -319,9 +324,9 @@ struct PromoteMem2Reg {
 
 public:
   PromoteMem2Reg(ArrayRef<AllocaInst *> Allocas, DominatorTree &DT,
-                 AliasSetTracker *AST)
+                 const DataLayout *DL, AliasSetTracker *AST)
       : Allocas(Allocas.begin(), Allocas.end()), DT(DT),
-        DIB(*DT.getRoot()->getParent()->getParent()), AST(AST) {}
+        DIB(*DT.getRoot()->getParent()->getParent()), DL(DL), AST(AST) {}
 
   void run();
 
@@ -585,7 +590,7 @@ void PromoteMem2Reg::run() {
     PointerAllocaValues.resize(Allocas.size());
   AllocaDbgDeclares.resize(Allocas.size());
 
-  AllocaInfo Info;
+  AllocaInfo Info(DL);
   LargeBlockInfo LBI;
 
   for (unsigned AllocaNum = 0; AllocaNum != Allocas.size(); ++AllocaNum) {
@@ -1140,19 +1145,19 @@ NextIteration:
   goto NextIteration;
 }
 
-bool llvm::isAllocaPromotable(const AllocaInst *AI) {
+bool llvm::isAllocaPromotable(const AllocaInst *AI, const DataLayout *DL) {
   // We cast away constness because we re-use the non-const analysis that the
   // actual promotion routine uses. While it is non-const, it doesn't actually
   // mutate anything at this phase, and we discard the non-const results that
   // promotion uses to mutate the alloca.
-  return AllocaInfo().analyzeAlloca(*const_cast<AllocaInst *>(AI));
+  return AllocaInfo(DL).analyzeAlloca(*const_cast<AllocaInst *>(AI));
 }
 
-void llvm::PromoteMemToReg(ArrayRef<AllocaInst *> Allocas,
-                           DominatorTree &DT, AliasSetTracker *AST) {
+void llvm::PromoteMemToReg(ArrayRef<AllocaInst *> Allocas, DominatorTree &DT,
+                           const DataLayout *DL, AliasSetTracker *AST) {
   // If there is nothing to do, bail out...
   if (Allocas.empty())
     return;
 
-  PromoteMem2Reg(Allocas, DT, AST).run();
+  PromoteMem2Reg(Allocas, DT, DL, AST).run();
 }
-- 
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