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https://github.com/c64scene-ar/llvm-6502.git
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96135b617a
*) introducing new data type and export function of edge info for whole function (preparation for next patch). *) renaming variables to make clear distinction between data and containers that contain this data. *) updated comments and whitespaces. *) made ProfileInfo::MissingValue a double (as it should be...). (Discussed at http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20090817/084955.html.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79940 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
//===- ProfileInfo.cpp - Profile Info Interface ---------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the abstract ProfileInfo interface, and the default
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// "no profile" implementation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/ProfileInfo.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/Compiler.h"
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#include <set>
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using namespace llvm;
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// Register the ProfileInfo interface, providing a nice name to refer to.
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static RegisterAnalysisGroup<ProfileInfo> Z("Profile Information");
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char ProfileInfo::ID = 0;
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ProfileInfo::~ProfileInfo() {}
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const double ProfileInfo::MissingValue = -1;
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double ProfileInfo::getExecutionCount(const BasicBlock *BB) {
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std::map<const Function*, BlockCounts>::iterator J =
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BlockInformation.find(BB->getParent());
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if (J != BlockInformation.end()) {
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BlockCounts::iterator I = J->second.find(BB);
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if (I != J->second.end())
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return I->second;
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}
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pred_const_iterator PI = pred_begin(BB), PE = pred_end(BB);
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// Are there zero predecessors of this block?
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if (PI == PE) {
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// If this is the entry block, look for the Null -> Entry edge.
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if (BB == &BB->getParent()->getEntryBlock())
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return getEdgeWeight(getEdge(0, BB));
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else
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return 0; // Otherwise, this is a dead block.
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}
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// Otherwise, if there are predecessors, the execution count of this block is
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// the sum of the edge frequencies from the incoming edges.
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std::set<const BasicBlock*> ProcessedPreds;
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double Count = 0;
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for (; PI != PE; ++PI)
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if (ProcessedPreds.insert(*PI).second) {
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double w = getEdgeWeight(getEdge(*PI, BB));
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if (w == MissingValue) {
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Count = MissingValue;
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break;
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}
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Count += w;
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}
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if (Count != MissingValue) BlockInformation[BB->getParent()][BB] = Count;
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return Count;
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}
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double ProfileInfo::getExecutionCount(const Function *F) {
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if (F->isDeclaration()) return MissingValue;
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std::map<const Function*, double>::iterator J =
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FunctionInformation.find(F);
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if (J != FunctionInformation.end())
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return J->second;
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double Count = getExecutionCount(&F->getEntryBlock());
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if (Count != MissingValue) FunctionInformation[F] = Count;
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return Count;
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}
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//===----------------------------------------------------------------------===//
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// NoProfile ProfileInfo implementation
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//
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namespace {
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struct VISIBILITY_HIDDEN NoProfileInfo
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: public ImmutablePass, public ProfileInfo {
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static char ID; // Class identification, replacement for typeinfo
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NoProfileInfo() : ImmutablePass(&ID) {}
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};
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} // End of anonymous namespace
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char NoProfileInfo::ID = 0;
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// Register this pass...
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static RegisterPass<NoProfileInfo>
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X("no-profile", "No Profile Information", false, true);
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// Declare that we implement the ProfileInfo interface
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static RegisterAnalysisGroup<ProfileInfo, true> Y(X);
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ImmutablePass *llvm::createNoProfileInfoPass() { return new NoProfileInfo(); }
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