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Revert 250089 due to bot failure. It failed when building clang itself with PGO.

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llvm-svn: 250145
This commit is contained in:
Manman Ren 2015-10-13 03:38:02 +00:00
parent 49222f78ba
commit 3f113087cd
7 changed files with 5 additions and 222 deletions
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3
include/llvm/Analysis/BlockFrequencyInfo.h
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@ -45,9 +45,6 @@ public:
/// floating points.
BlockFrequency getBlockFreq(const BasicBlock *BB) const;
// Set the frequency of the given basic block.
void setBlockFreq(const BasicBlock *BB, uint64_t Freq);
/// calculate - compute block frequency info for the given function.
void calculate(const Function &F, const BranchProbabilityInfo &BPI,
const LoopInfo &LI);

18
include/llvm/Analysis/BlockFrequencyInfoImpl.h
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@ -477,8 +477,6 @@ public:
BlockFrequency getBlockFreq(const BlockNode &Node) const;
void setBlockFreq(const BlockNode &Node, uint64_t Freq);
raw_ostream &printBlockFreq(raw_ostream &OS, const BlockNode &Node) const;
raw_ostream &printBlockFreq(raw_ostream &OS,
const BlockFrequency &Freq) const;
@ -915,7 +913,6 @@ public:
BlockFrequency getBlockFreq(const BlockT *BB) const {
return BlockFrequencyInfoImplBase::getBlockFreq(getNode(BB));
}
void setBlockFreq(const BlockT *BB, uint64_t Freq);
Scaled64 getFloatingBlockFreq(const BlockT *BB) const {
return BlockFrequencyInfoImplBase::getFloatingBlockFreq(getNode(BB));
}
@ -968,21 +965,6 @@ void BlockFrequencyInfoImpl<BT>::calculate(const FunctionT &F,
finalizeMetrics();
}
template <class BT>
void BlockFrequencyInfoImpl<BT>::setBlockFreq(const BlockT *BB, uint64_t Freq) {
if (Nodes.count(BB))
BlockFrequencyInfoImplBase::setBlockFreq(getNode(BB), Freq);
else {
// If BB is a newly added block after BFI is done, we need to create a new
// BlockNode for it assigned with a new index. The index can be determined
// by the size of Freqs.
BlockNode NewNode(Freqs.size());
Nodes[BB] = NewNode;
Freqs.emplace_back();
BlockFrequencyInfoImplBase::setBlockFreq(NewNode, Freq);
}
}
template <class BT> void BlockFrequencyInfoImpl<BT>::initializeRPOT() {
const BlockT *Entry = &F->front();
RPOT.reserve(F->size());

27
include/llvm/CodeGen/MachineBranchProbabilityInfo.h
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@ -83,35 +83,8 @@ public:
raw_ostream &printEdgeProbability(raw_ostream &OS,
const MachineBasicBlock *Src,
const MachineBasicBlock *Dst) const;
// Normalize a list of weights by scaling them down so that the sum of them
// doesn't exceed UINT32_MAX. Return the scale.
template <class WeightListIter>
static uint32_t normalizeEdgeWeights(WeightListIter Begin,
WeightListIter End);
};
template <class WeightListIter>
uint32_t
MachineBranchProbabilityInfo::normalizeEdgeWeights(WeightListIter Begin,
WeightListIter End) {
// First we compute the sum with 64-bits of precision.
uint64_t Sum = std::accumulate(Begin, End, uint64_t(0));
// If the computed sum fits in 32-bits, we're done.
if (Sum <= UINT32_MAX)
return 1;
// Otherwise, compute the scale necessary to cause the weights to fit, and
// re-sum with that scale applied.
assert((Sum / UINT32_MAX) < UINT32_MAX &&
"The sum of weights exceeds UINT32_MAX^2!");
uint32_t Scale = (Sum / UINT32_MAX) + 1;
for (auto I = Begin; I != End; ++I)
*I /= Scale;
return Scale;
}
}

6
lib/Analysis/BlockFrequencyInfo.cpp
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@ -129,12 +129,6 @@ BlockFrequency BlockFrequencyInfo::getBlockFreq(const BasicBlock *BB) const {
return BFI ? BFI->getBlockFreq(BB) : 0;
}
void BlockFrequencyInfo::setBlockFreq(const BasicBlock *BB,
uint64_t Freq) {
assert(BFI && "Expected analysis to be available");
BFI->setBlockFreq(BB, Freq);
}
/// Pop up a ghostview window with the current block frequency propagation
/// rendered using dot.
void BlockFrequencyInfo::view() const {

7
lib/Analysis/BlockFrequencyInfoImpl.cpp
View File

@ -530,13 +530,6 @@ BlockFrequencyInfoImplBase::getFloatingBlockFreq(const BlockNode &Node) const {
return Freqs[Node.Index].Scaled;
}
void BlockFrequencyInfoImplBase::setBlockFreq(const BlockNode &Node,
uint64_t Freq) {
assert(Node.isValid() && "Expected valid node");
assert(Node.Index < Freqs.size() && "Expected legal index");
Freqs[Node.Index].Integer = Freq;
}
std::string
BlockFrequencyInfoImplBase::getBlockName(const BlockNode &Node) const {
return std::string();

121
lib/Transforms/Scalar/JumpThreading.cpp
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@ -20,20 +20,14 @@
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/BlockFrequencyInfo.h"
#include "llvm/Analysis/BlockFrequencyInfoImpl.h"
#include "llvm/Analysis/BranchProbabilityInfo.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/LazyValueInfo.h"
#include "llvm/Analysis/Loads.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Pass.h"
@ -43,8 +37,6 @@
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/SSAUpdater.h"
#include <algorithm>
#include <memory>
using namespace llvm;
#define DEBUG_TYPE "jump-threading"
@ -89,9 +81,6 @@ namespace {
class JumpThreading : public FunctionPass {
TargetLibraryInfo *TLI;
LazyValueInfo *LVI;
std::unique_ptr<BlockFrequencyInfo> BFI;
std::unique_ptr<BranchProbabilityInfo> BPI;
bool HasProfileData;
#ifdef NDEBUG
SmallPtrSet<BasicBlock*, 16> LoopHeaders;
#else
@ -130,11 +119,6 @@ namespace {
AU.addRequired<TargetLibraryInfoWrapperPass>();
}
void releaseMemory() override {
BFI.reset();
BPI.reset();
}
void FindLoopHeaders(Function &F);
bool ProcessBlock(BasicBlock *BB);
bool ThreadEdge(BasicBlock *BB, const SmallVectorImpl<BasicBlock*> &PredBBs,
@ -155,12 +139,6 @@ namespace {
bool SimplifyPartiallyRedundantLoad(LoadInst *LI);
bool TryToUnfoldSelect(CmpInst *CondCmp, BasicBlock *BB);
private:
BasicBlock *SplitBlockPreds(BasicBlock *BB, ArrayRef<BasicBlock *> Preds,
const char *Suffix);
void UpdateBlockFreqAndEdgeWeight(BasicBlock *PredBB, BasicBlock *BB,
BasicBlock *NewBB, BasicBlock *SuccBB);
};
}
@ -184,16 +162,6 @@ bool JumpThreading::runOnFunction(Function &F) {
DEBUG(dbgs() << "Jump threading on function '" << F.getName() << "'\n");
TLI = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
LVI = &getAnalysis<LazyValueInfo>();
BFI.reset();
BPI.reset();
// When profile data is available, we need to update edge weights after
// successful jump threading, which requires both BPI and BFI being available.
HasProfileData = F.getEntryCount().hasValue();
if (HasProfileData) {
LoopInfo LI{DominatorTree(F)};
BPI.reset(new BranchProbabilityInfo(F, LI));
BFI.reset(new BlockFrequencyInfo(F, *BPI, LI));
}
// Remove unreachable blocks from function as they may result in infinite
// loop. We do threading if we found something profitable. Jump threading a
@ -1009,7 +977,8 @@ bool JumpThreading::SimplifyPartiallyRedundantLoad(LoadInst *LI) {
}
// Split them out to their own block.
UnavailablePred = SplitBlockPreds(LoadBB, PredsToSplit, "thread-pre-split");
UnavailablePred =
SplitBlockPredecessors(LoadBB, PredsToSplit, "thread-pre-split");
}
// If the value isn't available in all predecessors, then there will be
@ -1434,7 +1403,7 @@ bool JumpThreading::ThreadEdge(BasicBlock *BB,
else {
DEBUG(dbgs() << " Factoring out " << PredBBs.size()
<< " common predecessors.\n");
PredBB = SplitBlockPreds(BB, PredBBs, ".thr_comm");
PredBB = SplitBlockPredecessors(BB, PredBBs, ".thr_comm");
}
// And finally, do it!
@ -1455,13 +1424,6 @@ bool JumpThreading::ThreadEdge(BasicBlock *BB,
BB->getParent(), BB);
NewBB->moveAfter(PredBB);
// Set the block frequency of NewBB.
if (HasProfileData) {
auto NewBBFreq =
BFI->getBlockFreq(PredBB) * BPI->getEdgeProbability(PredBB, BB);
BFI->setBlockFreq(NewBB, NewBBFreq.getFrequency());
}
BasicBlock::iterator BI = BB->begin();
for (; PHINode *PN = dyn_cast<PHINode>(BI); ++BI)
ValueMapping[PN] = PN->getIncomingValueForBlock(PredBB);
@ -1546,86 +1508,11 @@ bool JumpThreading::ThreadEdge(BasicBlock *BB,
// frequently happens because of phi translation.
SimplifyInstructionsInBlock(NewBB, TLI);
// Update the edge weight from BB to SuccBB, which should be less than before.
UpdateBlockFreqAndEdgeWeight(PredBB, BB, NewBB, SuccBB);
// Threaded an edge!
++NumThreads;
return true;
}
/// Create a new basic block that will be the predecessor of BB and successor of
/// all blocks in Preds. When profile data is availble, update the frequency of
/// this new block.
BasicBlock *JumpThreading::SplitBlockPreds(BasicBlock *BB,
ArrayRef<BasicBlock *> Preds,
const char *Suffix) {
// Collect the frequencies of all predecessors of BB, which will be used to
// update the edge weight on BB->SuccBB.
BlockFrequency PredBBFreq(0);
if (HasProfileData)
for (auto Pred : Preds)
PredBBFreq += BFI->getBlockFreq(Pred) * BPI->getEdgeProbability(Pred, BB);
BasicBlock *PredBB = SplitBlockPredecessors(BB, Preds, Suffix);
// Set the block frequency of the newly created PredBB, which is the sum of
// frequencies of Preds.
if (HasProfileData)
BFI->setBlockFreq(PredBB, PredBBFreq.getFrequency());
return PredBB;
}
/// Update the block frequency of BB and branch weight and the metadata on the
/// edge BB->SuccBB. This is done by scaling the weight of BB->SuccBB by 1 -
/// Freq(PredBB->BB) / Freq(BB->SuccBB).
void JumpThreading::UpdateBlockFreqAndEdgeWeight(BasicBlock *PredBB,
BasicBlock *BB,
BasicBlock *NewBB,
BasicBlock *SuccBB) {
if (!HasProfileData)
return;
assert(BFI && BPI && "BFI & BPI should have been created here");
// As the edge from PredBB to BB is deleted, we have to update the block
// frequency of BB.
auto BBOrigFreq = BFI->getBlockFreq(BB);
auto NewBBFreq = BFI->getBlockFreq(NewBB);
auto BB2SuccBBFreq = BBOrigFreq * BPI->getEdgeProbability(BB, SuccBB);
auto BBNewFreq = BBOrigFreq - NewBBFreq;
BFI->setBlockFreq(BB, BBNewFreq.getFrequency());
// Collect updated outgoing edges' frequencies from BB and use them to update
// edge weights.
SmallVector<uint64_t, 4> BBSuccFreq;
for (auto I = succ_begin(BB), E = succ_end(BB); I != E; ++I) {
auto SuccFreq = (*I == SuccBB)
? BB2SuccBBFreq - NewBBFreq
: BBOrigFreq * BPI->getEdgeProbability(BB, *I);
BBSuccFreq.push_back(SuccFreq.getFrequency());
}
// Normalize edge weights in Weights64 so that the sum of them can fit in
MachineBranchProbabilityInfo::normalizeEdgeWeights(BBSuccFreq.begin(),
BBSuccFreq.end());
SmallVector<uint32_t, 4> Weights;
for (auto Freq : BBSuccFreq)
Weights.push_back(static_cast<uint32_t>(Freq));
// Update edge weights in BPI.
for (int I = 0, E = Weights.size(); I < E; I++)
BPI->setEdgeWeight(BB, I, Weights[I]);
if (Weights.size() >= 2) {
auto TI = BB->getTerminator();
TI->setMetadata(
LLVMContext::MD_prof,
MDBuilder(TI->getParent()->getContext()).createBranchWeights(Weights));
}
}
/// DuplicateCondBranchOnPHIIntoPred - PredBB contains an unconditional branch
/// to BB which contains an i1 PHI node and a conditional branch on that PHI.
/// If we can duplicate the contents of BB up into PredBB do so now, this
@ -1659,7 +1546,7 @@ bool JumpThreading::DuplicateCondBranchOnPHIIntoPred(BasicBlock *BB,
else {
DEBUG(dbgs() << " Factoring out " << PredBBs.size()
<< " common predecessors.\n");
PredBB = SplitBlockPreds(BB, PredBBs, ".thr_comm");
PredBB = SplitBlockPredecessors(BB, PredBBs, ".thr_comm");
}
// Okay, we decided to do this! Clone all the instructions in BB onto the end

43
test/Transforms/JumpThreading/update-edge-weight.ll
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@ -1,43 +0,0 @@
; RUN: opt -S -jump-threading %s | FileCheck %s
; Test if edge weights are properly updated after jump threading.
; CHECK: !2 = !{!"branch_weights", i32 22, i32 7}
define void @foo(i32 %n) !prof !0 {
entry:
%cmp = icmp sgt i32 %n, 10
br i1 %cmp, label %if.then.1, label %if.else.1, !prof !1
if.then.1:
tail call void @a()
br label %if.cond
if.else.1:
tail call void @b()
br label %if.cond
if.cond:
%cmp1 = icmp sgt i32 %n, 5
br i1 %cmp1, label %if.then.2, label %if.else.2, !prof !2
if.then.2:
tail call void @c()
br label %if.end
if.else.2:
tail call void @d()
br label %if.end
if.end:
ret void
}
declare void @a()
declare void @b()
declare void @c()
declare void @d()
!0 = !{!"function_entry_count", i64 1}
!1 = !{!"branch_weights", i32 10, i32 5}
!2 = !{!"branch_weights", i32 10, i32 1}