Add a comment to describe why vector shuffles are legalized to custom DAG nodes.

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

diff --git a/lib/Analysis/ProfileInfo.cpp b/lib/Analysis/ProfileInfo.cpp
index a96dc4f2fc66fee83713f02e6c44785d10100225..2ed466bf3238aef7934cac8c006dcedde5ebacd6 100644 (file)
--- a/lib/Analysis/ProfileInfo.cpp
+++ b/lib/Analysis/ProfileInfo.cpp
@@ -1,10 +1,10 @@
 //===- ProfileInfo.cpp - Profile Info Interface ---------------------------===//
-// 
+//
 //                     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.
-// 
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
 //===----------------------------------------------------------------------===//
 //
 // This file implements the abstract ProfileInfo interface, and the default
@@ -12,29 +12,88 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/Analysis/Passes.h"
 #include "llvm/Analysis/ProfileInfo.h"
 #include "llvm/Pass.h"
+#include "llvm/Support/CFG.h"
+#include "llvm/Support/Compiler.h"
+#include <set>
 using namespace llvm;
 
 // Register the ProfileInfo interface, providing a nice name to refer to.
-namespace {
-  RegisterAnalysisGroup<ProfileInfo> Z("Profile Information");
-}
+static RegisterAnalysisGroup<ProfileInfo> Z("Profile Information");
+char ProfileInfo::ID = 0;
 
 ProfileInfo::~ProfileInfo() {}
 
+double ProfileInfo::getExecutionCount(const BasicBlock *BB) {
+  std::map<const Function*, BlockCounts>::iterator J =
+    BlockInformation.find(BB->getParent());
+  if (J != BlockInformation.end()) {
+    BlockCounts::iterator I = J->second.find(BB);
+    if (I != J->second.end())
+      return I->second;
+  }
+
+  pred_const_iterator PI = pred_begin(BB), PE = pred_end(BB);
+
+  // Are there zero predecessors of this block?
+  if (PI == PE) {
+    // If this is the entry block, look for the Null -> Entry edge.
+    if (BB == &BB->getParent()->getEntryBlock())
+      return getEdgeWeight(getEdge(0, BB));
+    else
+      return 0;   // Otherwise, this is a dead block.
+  }
+
+  // Otherwise, if there are predecessors, the execution count of this block is
+  // the sum of the edge frequencies from the incoming edges.
+  std::set<const BasicBlock*> ProcessedPreds;
+  double Count = 0;
+  for (; PI != PE; ++PI)
+    if (ProcessedPreds.insert(*PI).second) {
+      double w = getEdgeWeight(getEdge(*PI, BB));
+      if (w == MissingValue) {
+        Count = MissingValue; break;
+      }
+      Count += w;
+    }
+
+  BlockInformation[BB->getParent()][BB] = Count;
+  return Count;
+}
+
+double ProfileInfo::getExecutionCount(const Function *F) {
+  if (F->isDeclaration()) return MissingValue;
+  std::map<const Function*, double>::iterator J =
+    FunctionInformation.find(F);
+  if (J != FunctionInformation.end())
+    return J->second;
+
+  double Count = getExecutionCount(&F->getEntryBlock());
+  FunctionInformation[F] = Count;
+  return Count;
+}
+
 
 //===----------------------------------------------------------------------===//
 //  NoProfile ProfileInfo implementation
 //
 
 namespace {
-  struct NoProfileInfo : public ImmutablePass, public ProfileInfo {};
- 
-  // Register this pass...
-  RegisterOpt<NoProfileInfo>
-  X("no-profile", "No Profile Information");
-
-  // Declare that we implement the ProfileInfo interface
-  RegisterAnalysisGroup<ProfileInfo, NoProfileInfo, true> Y;
+  struct VISIBILITY_HIDDEN NoProfileInfo 
+    : public ImmutablePass, public ProfileInfo {
+    static char ID; // Class identification, replacement for typeinfo
+    NoProfileInfo() : ImmutablePass(&ID) {}
+  };
 }  // End of anonymous namespace
+
+char NoProfileInfo::ID = 0;
+// Register this pass...
+static RegisterPass<NoProfileInfo>
+X("no-profile", "No Profile Information", false, true);
+
+// Declare that we implement the ProfileInfo interface
+static RegisterAnalysisGroup<ProfileInfo, true> Y(X);
+
+ImmutablePass *llvm::createNoProfileInfoPass() { return new NoProfileInfo(); }