Change the mem2reg interface to accept a TargetData argument

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5685 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/Utils/PromoteMemToReg.h

@@ -10,12 +10,13 @@
 
 class AllocaInst;
 class DominanceFrontier;
+class TargetData;
 #include <vector>
 
 /// isAllocaPromotable - Return true if this alloca is legal for promotion.
 /// This is true if there are only loads and stores to the alloca...
 ///
-bool isAllocaPromotable(const AllocaInst *AI);
+bool isAllocaPromotable(const AllocaInst *AI, const TargetData &TD);
 
 /// PromoteMemToReg - Promote the specified list of alloca instructions into
 /// scalar registers, inserting PHI nodes as appropriate.  This function makes
@@ -23,7 +24,6 @@ bool isAllocaPromotable(const AllocaInst *AI);
 /// of the function at all.  All allocas must be from the same function.
 ///
 void PromoteMemToReg(const std::vector<AllocaInst*> &Allocas,
-                     DominanceFrontier &DF);
-
+                     DominanceFrontier &DF, const TargetData &TD);
 
 #endif

lib/Transforms/Scalar/LICM.cpp

@@ -27,6 +27,7 @@
 #include "llvm/Analysis/Dominators.h"
 #include "llvm/Instructions.h"
 #include "llvm/DerivedTypes.h"
+#include "llvm/Target/TargetData.h"
 #include "llvm/Support/InstVisitor.h"
 #include "llvm/Support/CFG.h"
 #include "Support/Statistic.h"
@@ -457,7 +458,8 @@ void LICM::PromoteValuesInLoop() {
   PromotedAllocas.reserve(PromotedValues.size());
   for (unsigned i = 0, e = PromotedValues.size(); i != e; ++i)
     PromotedAllocas.push_back(PromotedValues[i].first);
-  PromoteMemToReg(PromotedAllocas, getAnalysis<DominanceFrontier>());
+  PromoteMemToReg(PromotedAllocas, getAnalysis<DominanceFrontier>(),
+                  AA->getTargetData());
 }
 
 /// findPromotableValuesInLoop - Check the current loop for stores to definate

lib/Transforms/Utils/Mem2Reg.cpp

@@ -10,6 +10,7 @@
 #include "llvm/Analysis/Dominators.h"
 #include "llvm/iMemory.h"
 #include "llvm/Function.h"
+#include "llvm/Target/TargetData.h"
 #include "Support/Statistic.h"
 
 namespace {
@@ -25,6 +26,7 @@ namespace {
     //
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.addRequired<DominanceFrontier>();
+      AU.addRequired<TargetData>();
       AU.setPreservesCFG();
     }
   };
@@ -34,6 +36,7 @@ namespace {
 
 bool PromotePass::runOnFunction(Function &F) {
   std::vector<AllocaInst*> Allocas;
+  const TargetData &TD = getAnalysis<TargetData>();
 
   BasicBlock &BB = F.getEntryNode();  // Get the entry node for the function
 
@@ -41,11 +44,11 @@ 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, TD))
         Allocas.push_back(AI);
 
   if (!Allocas.empty()) {
-    PromoteMemToReg(Allocas, getAnalysis<DominanceFrontier>());
+    PromoteMemToReg(Allocas, getAnalysis<DominanceFrontier>(), TD);
     NumPromoted += Allocas.size();
     return true;
   }

lib/Transforms/Utils/PromoteMemoryToRegister.cpp

@@ -28,7 +28,10 @@
 /// isAllocaPromotable - Return true if this alloca is legal for promotion.
 /// This is true if there are only loads and stores to the alloca...
 ///
-bool isAllocaPromotable(const AllocaInst *AI) {
+bool isAllocaPromotable(const AllocaInst *AI, const TargetData &TD) {
+  // FIXME: If the memory unit is of pointer or integer type, we can permit
+  // assignments to subsections of the memory unit.
+
   // Only allow direct loads and stores...
   for (Value::use_const_iterator UI = AI->use_begin(), UE = AI->use_end();
        UI != UE; ++UI)     // Loop over all of the uses of the alloca
@@ -48,6 +51,7 @@ namespace {
   struct PromoteMem2Reg {
     const std::vector<AllocaInst*>   &Allocas;      // the alloca instructions..
     DominanceFrontier &DF;
+    const TargetData &TD;
 
     std::map<Instruction*, unsigned>  AllocaLookup; // reverse mapping of above
     
@@ -60,8 +64,9 @@ namespace {
              std::vector<PHINode*> >  NewPhiNodes; // the PhiNodes we're adding
 
   public:
-    PromoteMem2Reg(const std::vector<AllocaInst*> &A, DominanceFrontier &df)
-      :Allocas(A), DF(df) {}
+    PromoteMem2Reg(const std::vector<AllocaInst*> &A, DominanceFrontier &df,
+                   const TargetData &td)
+      : Allocas(A), DF(df), TD(td) {}
 
     void run();
 
@@ -81,7 +86,7 @@ void PromoteMem2Reg::run() {
   Function &F = *DF.getRoot()->getParent();
 
   for (unsigned i = 0, e = Allocas.size(); i != e; ++i) {
-    assert(isAllocaPromotable(Allocas[i]) &&
+    assert(isAllocaPromotable(Allocas[i], TD) &&
            "Cannot promote non-promotable alloca!");
     assert(Allocas[i]->getParent()->getParent() == &F &&
            "All allocas should be in the same function, which is same as DF!");
@@ -240,6 +245,6 @@ void PromoteMem2Reg::RenamePass(BasicBlock *BB, BasicBlock *Pred,
 /// of the function at all.  All allocas must be from the same function.
 ///
 void PromoteMemToReg(const std::vector<AllocaInst*> &Allocas,
-                     DominanceFrontier &DF) {
-  PromoteMem2Reg(Allocas, DF).run();
+                     DominanceFrontier &DF, const TargetData &TD) {
+  PromoteMem2Reg(Allocas, DF, TD).run();
 }