Make use of @llvm.assume in ValueTracking (computeKnownBits, etc.)

[oota-llvm.git] / lib / Analysis / Delinearization.cpp

diff --git a/lib/Analysis/Delinearization.cpp b/lib/Analysis/Delinearization.cpp
index fd4a2f0d7d32ab46fefae6aeb06f4fac3704a85f..9334cebe1802b8e8696ededb578971e96048b145 100644 (file)
--- a/lib/Analysis/Delinearization.cpp
+++ b/lib/Analysis/Delinearization.cpp
@@ -14,8 +14,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DL_NAME "delinearize"
-#define DEBUG_TYPE DL_NAME
 #include "llvm/IR/Constants.h"
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Analysis/Passes.h"
@@ -34,6 +32,9 @@
 
 using namespace llvm;
 
+#define DL_NAME "delinearize"
+#define DEBUG_TYPE DL_NAME
+
 namespace {
 
 class Delinearization : public FunctionPass {
@@ -51,7 +52,7 @@ public:
   }
   bool runOnFunction(Function &F) override;
   void getAnalysisUsage(AnalysisUsage &AU) const override;
-  void print(raw_ostream &O, const Module *M = 0) const override;
+  void print(raw_ostream &O, const Module *M = nullptr) const override;
 };
 
 } // end anonymous namespace
@@ -76,7 +77,7 @@ static Value *getPointerOperand(Instruction &Inst) {
     return Store->getPointerOperand();
   else if (GetElementPtrInst *Gep = dyn_cast<GetElementPtrInst>(&Inst))
     return Gep->getPointerOperand();
-  return NULL;
+  return nullptr;
 }
 
 void Delinearization::print(raw_ostream &O, const Module *) const {
@@ -92,25 +93,38 @@ void Delinearization::print(raw_ostream &O, const Module *) const {
     const BasicBlock *BB = Inst->getParent();
     // Delinearize the memory access as analyzed in all the surrounding loops.
     // Do not analyze memory accesses outside loops.
-    for (Loop *L = LI->getLoopFor(BB); L != NULL; L = L->getParentLoop()) {
+    for (Loop *L = LI->getLoopFor(BB); L != nullptr; L = L->getParentLoop()) {
       const SCEV *AccessFn = SE->getSCEVAtScope(getPointerOperand(*Inst), L);
+
+      const SCEVUnknown *BasePointer =
+          dyn_cast<SCEVUnknown>(SE->getPointerBase(AccessFn));
+      // Do not delinearize if we cannot find the base pointer.
+      if (!BasePointer)
+        break;
+      AccessFn = SE->getMinusSCEV(AccessFn, BasePointer);
       const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(AccessFn);
 
       // Do not try to delinearize memory accesses that are not AddRecs.
       if (!AR)
         break;
 
+
+      O << "\n";
+      O << "Inst:" << *Inst << "\n";
+      O << "In Loop with Header: " << L->getHeader()->getName() << "\n";
       O << "AddRec: " << *AR << "\n";
 
       SmallVector<const SCEV *, 3> Subscripts, Sizes;
-      const SCEV *Res = AR->delinearize(*SE, Subscripts, Sizes);
-      int Size = Subscripts.size();
-      if (Res == AR || Size == 0) {
+      AR->delinearize(*SE, Subscripts, Sizes, SE->getElementSize(Inst));
+      if (Subscripts.size() == 0 || Sizes.size() == 0 ||
+          Subscripts.size() != Sizes.size()) {
         O << "failed to delinearize\n";
         continue;
       }
-      O << "Base offset: " << *Res << "\n";
+
+      O << "Base offset: " << *BasePointer << "\n";
       O << "ArrayDecl[UnknownSize]";
+      int Size = Subscripts.size();
       for (int i = 0; i < Size - 1; i++)
         O << "[" << *Sizes[i] << "]";
       O << " with elements of " << *Sizes[Size - 1] << " bytes.\n";