[BasicAA] Remove special casing of memset_pattern16 in favor of generic attribute...

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

diff --git a/lib/Analysis/MemDerefPrinter.cpp b/lib/Analysis/MemDerefPrinter.cpp
index 64cec181a2f95a5c69595275d31d1885862d24ef..36f1424c8cf96b014d34f87b4a3656b940a4827b 100644 (file)
--- a/lib/Analysis/MemDerefPrinter.cpp
+++ b/lib/Analysis/MemDerefPrinter.cpp
@@ -10,43 +10,56 @@
 #include "llvm/Analysis/Passes.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/Analysis/MemoryDependenceAnalysis.h"
+#include "llvm/Analysis/ValueTracking.h"
 #include "llvm/IR/CallSite.h"
+#include "llvm/IR/DataLayout.h"
 #include "llvm/IR/InstIterator.h"
 #include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
 namespace {
   struct MemDerefPrinter : public FunctionPass {
-    SmallVector<Value *, 4> Vec;
+    SmallVector<Value *, 4> Deref;
+    SmallPtrSet<Value *, 4> DerefAndAligned;
 
-    static char ID; // Pass identifcation, replacement for typeid
+    static char ID; // Pass identification, replacement for typeid
     MemDerefPrinter() : FunctionPass(ID) {
       initializeMemDerefPrinterPass(*PassRegistry::getPassRegistry());
     }
+    void getAnalysisUsage(AnalysisUsage &AU) const override {
+      AU.setPreservesAll();
+    }
     bool runOnFunction(Function &F) override;
     void print(raw_ostream &OS, const Module * = nullptr) const override;
     void releaseMemory() override {
-      Vec.clear();
+      Deref.clear();
+      DerefAndAligned.clear();
     }
   };
 }
 
 char MemDerefPrinter::ID = 0;
-INITIALIZE_PASS(MemDerefPrinter, "print-memderefs",
-                "Memory Dereferenciblity of pointers in function", false, true)
+INITIALIZE_PASS_BEGIN(MemDerefPrinter, "print-memderefs",
+                      "Memory Dereferenciblity of pointers in function", false, true)
+INITIALIZE_PASS_END(MemDerefPrinter, "print-memderefs",
+                    "Memory Dereferenciblity of pointers in function", false, true)
 
 FunctionPass *llvm::createMemDerefPrinter() {
   return new MemDerefPrinter();
 }
 
 bool MemDerefPrinter::runOnFunction(Function &F) {
-  for (auto &I: inst_range(F)) {
+  const DataLayout &DL = F.getParent()->getDataLayout();
+  for (auto &I: instructions(F)) {
     if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
       Value *PO = LI->getPointerOperand();
-      if (PO->isDereferenceablePointer(nullptr))
-        Vec.push_back(PO);
+      if (isDereferenceablePointer(PO, DL))
+        Deref.push_back(PO);
+      if (isDereferenceableAndAlignedPointer(PO, LI->getAlignment(), DL))
+        DerefAndAligned.insert(PO);
     }
   }
   return false;
@@ -54,8 +67,12 @@ bool MemDerefPrinter::runOnFunction(Function &F) {
 
 void MemDerefPrinter::print(raw_ostream &OS, const Module *M) const {
   OS << "The following are dereferenceable:\n";
-  for (auto &V: Vec) {
+  for (Value *V: Deref) {
     V->print(OS);
+    if (DerefAndAligned.count(V))
+      OS << "\t(aligned)";
+    else
+      OS << "\t(unaligned)";
     OS << "\n\n";
   }
 }