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Create a wrapper pass for BlockFrequencyInfo.

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This is useful when we want to do block frequency analysis
conditionally (e.g. only in PGO mode) but don't want to add
one more pass dependence.

Patch by congh.
Approved by dexonsmith.
Differential Revision: http://reviews.llvm.org/D11196


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242248 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Wei Mi
2015-07-14 23:40:50 +00:00
parent 37de644bfb
commit d5892380e1
5 changed files with 80 additions and 49 deletions
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39
include/llvm/Analysis/BlockFrequencyInfo.h
View File

@@ -21,26 +21,16 @@
namespace llvm {
class BranchProbabilityInfo;
class LoopInfo;
template <class BlockT> class BlockFrequencyInfoImpl;
/// BlockFrequencyInfo pass uses BlockFrequencyInfoImpl implementation to
/// estimate IR basic block frequencies.
class BlockFrequencyInfo : public FunctionPass {
class BlockFrequencyInfo {
typedef BlockFrequencyInfoImpl<BasicBlock> ImplType;
std::unique_ptr<ImplType> BFI;
public:
static char ID;
BlockFrequencyInfo();
~BlockFrequencyInfo() override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool runOnFunction(Function &F) override;
void releaseMemory() override;
void print(raw_ostream &O, const Module *M) const override;
const Function *getFunction() const;
void view() const;
@@ -51,6 +41,10 @@ public:
/// floating points.
BlockFrequency getBlockFreq(const BasicBlock *BB) const;
/// calculate - compute block frequency info for the given function.
void calculate(const Function &F, const BranchProbabilityInfo &BPI,
const LoopInfo &LI);
// Print the block frequency Freq to OS using the current functions entry
// frequency to convert freq into a relative decimal form.
raw_ostream &printBlockFreq(raw_ostream &OS, const BlockFrequency Freq) const;
@@ -60,7 +54,28 @@ public:
raw_ostream &printBlockFreq(raw_ostream &OS, const BasicBlock *BB) const;
uint64_t getEntryFreq() const;
void releaseMemory();
void print(raw_ostream &OS) const;
};
/// \brief Legacy analysis pass which computes \c BlockFrequencyInfo.
class BlockFrequencyInfoWrapperPass : public FunctionPass {
BlockFrequencyInfo BFI;
public:
static char ID;
BlockFrequencyInfoWrapperPass();
~BlockFrequencyInfoWrapperPass() override;
BlockFrequencyInfo &getBFI() { return BFI; }
const BlockFrequencyInfo &getBFI() const { return BFI; }
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool runOnFunction(Function &F) override;
void releaseMemory() override;
void print(raw_ostream &OS, const Module *M) const override;
};
}

2
include/llvm/InitializePasses.h
View File

@@ -79,7 +79,7 @@ void initializeBarrierNoopPass(PassRegistry&);
void initializeBasicAliasAnalysisPass(PassRegistry&);
void initializeCallGraphWrapperPassPass(PassRegistry &);
void initializeBlockExtractorPassPass(PassRegistry&);
void initializeBlockFrequencyInfoPass(PassRegistry&);
void initializeBlockFrequencyInfoWrapperPassPass(PassRegistry&);
void initializeBoundsCheckingPass(PassRegistry&);
void initializeBranchFolderPassPass(PassRegistry&);
void initializeBranchProbabilityInfoPass(PassRegistry&);