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Revert "Codegen: Tail-duplicate during placement."

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This reverts commit ff234efbe23528e4f4c80c78057b920a51f434b2.

Causing crashes on aarch64 build.

llvm-svn: 283172
This commit is contained in:
Kyle Butt 2016-10-04 00:38:23 +00:00
parent 7b8f593578
commit 821db2945e
21 changed files with 93 additions and 613 deletions
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26
include/llvm/CodeGen/TailDuplicator.h
View File

@ -15,7 +15,6 @@
#ifndef LLVM_CODEGEN_TAILDUPLICATOR_H
#define LLVM_CODEGEN_TAILDUPLICATOR_H
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
@ -38,7 +37,6 @@ class TailDuplicator {
MachineRegisterInfo *MRI;
MachineFunction *MF;
bool PreRegAlloc;
bool LayoutMode;
unsigned TailDupSize;
// A list of virtual registers for which to update SSA form.
@ -52,16 +50,10 @@ class TailDuplicator {
public:
/// Prepare to run on a specific machine function.
/// @param MF - Function that will be processed
/// @param MBPI - Branch Probability Info. Used to propagate correct
/// probabilities when modifying the CFG.
/// @param LayoutMode - When true, don't use the existing layout to make
/// decisions.
/// @param TailDupSize - Maxmimum size of blocks to tail-duplicate. Zero
/// default implies using the command line value TailDupSize.
/// @param TailDupSize - Maxmimum size of blocks to tail-duplicate.
void initMF(MachineFunction &MF,
const MachineBranchProbabilityInfo *MBPI,
bool LayoutMode, unsigned TailDupSize = 0);
unsigned TailDupSize = 0);
bool tailDuplicateBlocks();
static bool isSimpleBB(MachineBasicBlock *TailBB);
bool shouldTailDuplicate(bool IsSimple, MachineBasicBlock &TailBB);
@ -71,13 +63,9 @@ public:
/// up.
/// If \p DuplicatePreds is not null, it will be updated to contain the list
/// of predecessors that received a copy of \p MBB.
/// If \p RemovalCallback is non-null. It will be called before MBB is
/// deleted.
bool tailDuplicateAndUpdate(
bool IsSimple, MachineBasicBlock *MBB,
MachineBasicBlock *ForcedLayoutPred,
SmallVectorImpl<MachineBasicBlock*> *DuplicatedPreds = nullptr,
llvm::function_ref<void(MachineBasicBlock *)> *RemovalCallback = nullptr);
SmallVectorImpl<MachineBasicBlock*> *DuplicatedPreds = nullptr);
private:
typedef TargetInstrInfo::RegSubRegPair RegSubRegPair;
@ -101,18 +89,14 @@ private:
SmallVectorImpl<MachineBasicBlock *> &TDBBs,
const DenseSet<unsigned> &RegsUsedByPhi,
SmallVectorImpl<MachineInstr *> &Copies);
bool tailDuplicate(bool IsSimple,
MachineBasicBlock *TailBB,
MachineBasicBlock *ForcedLayoutPred,
bool tailDuplicate(bool IsSimple, MachineBasicBlock *TailBB,
SmallVectorImpl<MachineBasicBlock *> &TDBBs,
SmallVectorImpl<MachineInstr *> &Copies);
void appendCopies(MachineBasicBlock *MBB,
SmallVectorImpl<std::pair<unsigned,RegSubRegPair>> &CopyInfos,
SmallVectorImpl<MachineInstr *> &Copies);
void removeDeadBlock(
MachineBasicBlock *MBB,
llvm::function_ref<void(MachineBasicBlock *)> *RemovalCallback = nullptr);
void removeDeadBlock(MachineBasicBlock *MBB);
};
} // End llvm namespace

301
lib/CodeGen/MachineBlockPlacement.cpp
View File

@ -40,7 +40,6 @@
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/TailDuplicator.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
@ -122,12 +121,6 @@ static cl::opt<unsigned> MisfetchCost(
static cl::opt<unsigned> JumpInstCost("jump-inst-cost",
cl::desc("Cost of jump instructions."),
cl::init(1), cl::Hidden);
static cl::opt<bool>
TailDupPlacement("tail-dup-placement",
cl::desc("Perform tail duplication during placement. "
"Creates more fallthrough opportunites in "
"outline branches."),
cl::init(true), cl::Hidden);
static cl::opt<bool>
BranchFoldPlacement("branch-fold-placement",
@ -135,14 +128,6 @@ BranchFoldPlacement("branch-fold-placement",
"Reduces code size."),
cl::init(true), cl::Hidden);
// Heuristic for tail duplication.
static cl::opt<unsigned> TailDuplicatePlacementThreshold(
"tail-dup-placement-threshold",
cl::desc("Instruction cutoff for tail duplication during layout. "
"Tail merging during layout is forced to have a threshold "
"that won't conflict."), cl::init(2),
cl::Hidden);
extern cl::opt<unsigned> StaticLikelyProb;
extern cl::opt<unsigned> ProfileLikelyProb;
@ -200,16 +185,6 @@ public:
/// \brief End of blocks within the chain.
iterator end() { return Blocks.end(); }
bool remove(MachineBasicBlock* BB) {
for(iterator i = begin(); i != end(); ++i) {
if (*i == BB) {
Blocks.erase(i);
return true;
}
}
return false;
}
/// \brief Merge a block chain into this one.
///
/// This routine merges a block chain into this one. It takes care of forming
@ -291,13 +266,6 @@ class MachineBlockPlacement : public MachineFunctionPass {
/// \brief A handle to the post dominator tree.
MachineDominatorTree *MDT;
/// \brief Duplicator used to duplicate tails during placement.
///
/// Placement decisions can open up new tail duplication opportunities, but
/// since tail duplication affects placement decisions of later blocks, it
/// must be done inline.
TailDuplicator TailDup;
/// \brief A set of blocks that are unavoidably execute, i.e. they dominate
/// all terminators of the MachineFunction.
SmallPtrSet<MachineBasicBlock *, 4> UnavoidableBlocks;
@ -319,18 +287,8 @@ class MachineBlockPlacement : public MachineFunctionPass {
/// between basic blocks.
DenseMap<MachineBasicBlock *, BlockChain *> BlockToChain;
/// Decrease the UnscheduledPredecessors count for all blocks in chain, and
/// if the count goes to 0, add them to the appropriate work list.
void markChainSuccessors(BlockChain &Chain, MachineBasicBlock *LoopHeaderBB,
const BlockFilterSet *BlockFilter = nullptr);
/// Decrease the UnscheduledPredecessors count for a single block, and
/// if the count goes to 0, add them to the appropriate work list.
void markBlockSuccessors(
BlockChain &Chain, MachineBasicBlock *BB, MachineBasicBlock *LoopHeaderBB,
const BlockFilterSet *BlockFilter = nullptr);
BranchProbability
collectViableSuccessors(MachineBasicBlock *BB, BlockChain &Chain,
const BlockFilterSet *BlockFilter,
@ -340,16 +298,6 @@ class MachineBlockPlacement : public MachineFunctionPass {
const BlockFilterSet *BlockFilter,
BranchProbability SuccProb,
BranchProbability HotProb);
bool repeatedlyTailDuplicateBlock(
MachineBasicBlock *BB, MachineBasicBlock *&LPred,
MachineBasicBlock *LoopHeaderBB,
BlockChain &Chain, BlockFilterSet *BlockFilter,
MachineFunction::iterator &PrevUnplacedBlockIt);
bool maybeTailDuplicateBlock(MachineBasicBlock *BB, MachineBasicBlock *LPred,
const BlockChain &Chain,
BlockFilterSet *BlockFilter,
MachineFunction::iterator &PrevUnplacedBlockIt,
bool &DuplicatedToPred);
bool
hasBetterLayoutPredecessor(MachineBasicBlock *BB, MachineBasicBlock *Succ,
BlockChain &SuccChain, BranchProbability SuccProb,
@ -375,7 +323,7 @@ class MachineBlockPlacement : public MachineFunctionPass {
SmallPtrSetImpl<BlockChain *> &UpdatedPreds,
const BlockFilterSet *BlockFilter);
void buildChain(MachineBasicBlock *BB, BlockChain &Chain,
BlockFilterSet *BlockFilter = nullptr);
const BlockFilterSet *BlockFilter = nullptr);
MachineBasicBlock *findBestLoopTop(MachineLoop &L,
const BlockFilterSet &LoopBlockSet);
MachineBasicBlock *findBestLoopExit(MachineLoop &L,
@ -440,49 +388,37 @@ static std::string getBlockName(MachineBasicBlock *BB) {
/// When a chain is being merged into the "placed" chain, this routine will
/// quickly walk the successors of each block in the chain and mark them as
/// having one fewer active predecessor. It also adds any successors of this
/// chain which reach the zero-predecessor state to the appropriate worklist.
/// chain which reach the zero-predecessor state to the worklist passed in.
void MachineBlockPlacement::markChainSuccessors(
BlockChain &Chain, MachineBasicBlock *LoopHeaderBB,
const BlockFilterSet *BlockFilter) {
// Walk all the blocks in this chain, marking their successors as having
// a predecessor placed.
for (MachineBasicBlock *MBB : Chain) {
markBlockSuccessors(Chain, MBB, LoopHeaderBB, BlockFilter);
}
}
// Add any successors for which this is the only un-placed in-loop
// predecessor to the worklist as a viable candidate for CFG-neutral
// placement. No subsequent placement of this block will violate the CFG
// shape, so we get to use heuristics to choose a favorable placement.
for (MachineBasicBlock *Succ : MBB->successors()) {
if (BlockFilter && !BlockFilter->count(Succ))
continue;
BlockChain &SuccChain = *BlockToChain[Succ];
// Disregard edges within a fixed chain, or edges to the loop header.
if (&Chain == &SuccChain || Succ == LoopHeaderBB)
continue;
/// \brief Mark a single block's successors as having one fewer preds.
///
/// Under normal circumstances, this is only called by markChainSuccessors,
/// but if a block that was to be placed is completely tail-duplicated away,
/// and was duplicated into the chain end, we need to redo markBlockSuccessors
/// for just that block.
void MachineBlockPlacement::markBlockSuccessors(
BlockChain &Chain, MachineBasicBlock *MBB, MachineBasicBlock *LoopHeaderBB,
const BlockFilterSet *BlockFilter) {
// Add any successors for which this is the only un-placed in-loop
// predecessor to the worklist as a viable candidate for CFG-neutral
// placement. No subsequent placement of this block will violate the CFG
// shape, so we get to use heuristics to choose a favorable placement.
for (MachineBasicBlock *Succ : MBB->successors()) {
if (BlockFilter && !BlockFilter->count(Succ))
continue;
BlockChain &SuccChain = *BlockToChain[Succ];
// Disregard edges within a fixed chain, or edges to the loop header.
if (&Chain == &SuccChain || Succ == LoopHeaderBB)
continue;
// This is a cross-chain edge that is within the loop, so decrement the
// loop predecessor count of the destination chain.
if (SuccChain.UnscheduledPredecessors == 0 ||
--SuccChain.UnscheduledPredecessors > 0)
continue;
// This is a cross-chain edge that is within the loop, so decrement the
// loop predecessor count of the destination chain.
if (SuccChain.UnscheduledPredecessors == 0 ||
--SuccChain.UnscheduledPredecessors > 0)
continue;
auto *MBB = *SuccChain.begin();
if (MBB->isEHPad())
EHPadWorkList.push_back(MBB);
else
BlockWorkList.push_back(MBB);
auto *MBB = *SuccChain.begin();
if (MBB->isEHPad())
EHPadWorkList.push_back(MBB);
else
BlockWorkList.push_back(MBB);
}
}
}
@ -966,7 +902,7 @@ void MachineBlockPlacement::fillWorkLists(
void MachineBlockPlacement::buildChain(
MachineBasicBlock *BB, BlockChain &Chain,
BlockFilterSet *BlockFilter) {
const BlockFilterSet *BlockFilter) {
assert(BB && "BB must not be null.\n");
assert(BlockToChain[BB] == &Chain && "BlockToChainMap mis-match.\n");
MachineFunction::iterator PrevUnplacedBlockIt = F->begin();
@ -1001,17 +937,6 @@ void MachineBlockPlacement::buildChain(
"layout successor until the CFG reduces\n");
}
// Placement may have changed tail duplication opportunities.
// Check for that now.
if (TailDupPlacement && BestSucc) {
// If the chosen successor was duplicated into all its predecessors,
// don't bother laying it out, just go round the loop again with BB as
// the chain end.
if (repeatedlyTailDuplicateBlock(BestSucc, BB, LoopHeaderBB, Chain,
BlockFilter, PrevUnplacedBlockIt))
continue;
}
// Place this block, updating the datastructures to reflect its placement.
BlockChain &SuccChain = *BlockToChain[BestSucc];
// Zero out UnscheduledPredecessors for the successor we're about to merge in case
@ -1793,170 +1718,6 @@ void MachineBlockPlacement::alignBlocks() {
}
}
/// Tail duplicate \p BB into (some) predecessors if profitable, repeating if
/// it was duplicated into its chain predecessor and removed.
/// \p BB - Basic block that may be duplicated.
///
/// \p LPred - Chosen layout predecessor of \p BB.
/// Updated to be the chain end if LPred is removed.
/// \p Chain - Chain to which \p LPred belongs, and \p BB will belong.
/// \p BlockFilter - Set of blocks that belong to the loop being laid out.
/// Used to identify which blocks to update predecessor
/// counts.
/// \p PrevUnplacedBlockIt - Iterator pointing to the last block that was
/// chosen in the given order due to unnatural CFG
/// only needed if \p BB is removed and
/// \p PrevUnplacedBlockIt pointed to \p BB.
/// @return true if \p BB was removed.
bool MachineBlockPlacement::repeatedlyTailDuplicateBlock(
MachineBasicBlock *BB, MachineBasicBlock *&LPred,
MachineBasicBlock *LoopHeaderBB,
BlockChain &Chain, BlockFilterSet *BlockFilter,
MachineFunction::iterator &PrevUnplacedBlockIt) {
bool Removed, DuplicatedToLPred;
Removed = maybeTailDuplicateBlock(BB, LPred, Chain, BlockFilter,
PrevUnplacedBlockIt,
DuplicatedToLPred);
if (!Removed)
return false;
// If BB was duplicated into LPred, it is now scheduled. But because it was
// removed, markChainSuccessors won't be called for its chain. Instead we call
// markBlockSuccessors for LPred to achieve the same effect.
if (DuplicatedToLPred)
markBlockSuccessors(Chain, LPred, LoopHeaderBB, BlockFilter);
// Iteratively try to duplicate again. It can happen that a block that is
// duplicated into is still small enough to be duplicated again.
// No need to call markBlockSuccessors in this case, as the blocks being
// duplicated from here on are already scheduled.
// Note that DuplicatedToLPred always implies Removed.
while (DuplicatedToLPred) {
assert (Removed && "Block must have been removed to be duplicated into its "
"layout predecessor.");
MachineBasicBlock *DupBB, *DupPred;
// The removal callback causes Chain.end() to be updated when a block is
// removed. On the first pass through the loop, the chain end should be the
// same as it was on function entry. On subsequent passes, because we are
// duplicating the block at the end of the chain, if it is removed the
// chain will have shrunk by one block.
BlockChain::iterator ChainEnd = Chain.end();
DupBB = *(--ChainEnd);
// Now try to duplicate again.
if (ChainEnd == Chain.begin())
break;
DupPred = *std::prev(ChainEnd);
Removed = maybeTailDuplicateBlock(DupBB, DupPred, Chain, BlockFilter,
PrevUnplacedBlockIt,
DuplicatedToLPred);
}
LPred = *std::prev(Chain.end());
return true;
}
/// Tail duplicate \p BB into (some) predecessors if profitable.
/// \p BB - Basic block that may be duplicated
/// \p LPred - Chosen layout predecessor of \p BB
/// \p Chain - Chain to which \p LPred belongs, and \p BB will belong.
/// \p BlockFilter - Set of blocks that belong to the loop being laid out.
/// Used to identify which blocks to update predecessor
/// counts.
/// \p PrevUnplacedBlockIt - Iterator pointing to the last block that was
/// chosen in the given order due to unnatural CFG
/// only needed if \p BB is removed and
/// \p PrevUnplacedBlockIt pointed to \p BB.
/// \p DuplicatedToLPred - True if the block was duplicated into LPred. Will
/// only be true if the block was removed.
/// \return - True if the block was duplicated into all preds and removed.
bool MachineBlockPlacement::maybeTailDuplicateBlock(
MachineBasicBlock *BB, MachineBasicBlock *LPred,
const BlockChain &Chain, BlockFilterSet *BlockFilter,
MachineFunction::iterator &PrevUnplacedBlockIt,
bool &DuplicatedToLPred) {
DuplicatedToLPred = false;
DEBUG(dbgs() << "Redoing tail duplication for Succ#"
<< BB->getNumber() << "\n");
bool IsSimple = TailDup.isSimpleBB(BB);
// Blocks with single successors don't create additional fallthrough
// opportunities. Don't duplicate them. TODO: When conditional exits are
// analyzable, allow them to be duplicated.
if (!IsSimple && BB->succ_size() == 1)
return false;
if (!TailDup.shouldTailDuplicate(IsSimple, *BB))
return false;
// This has to be a callback because none of it can be done after
// BB is deleted.
bool Removed = false;
auto RemovalCallback =
[&](MachineBasicBlock *RemBB) {
// Signal to outer function
Removed = true;
// Conservative default.
bool InWorkList = true;
// Remove from the Chain and Chain Map
if (BlockToChain.count(RemBB)) {
BlockChain *Chain = BlockToChain[RemBB];
InWorkList = Chain->UnscheduledPredecessors == 0;
Chain->remove(RemBB);
BlockToChain.erase(RemBB);
}
// Handle the unplaced block iterator
if (&(*PrevUnplacedBlockIt) == RemBB) {
PrevUnplacedBlockIt++;
}
// Handle the Work Lists
if (InWorkList) {
SmallVectorImpl<MachineBasicBlock *> &RemoveList = BlockWorkList;
if (RemBB->isEHPad())
RemoveList = EHPadWorkList;
RemoveList.erase(
remove_if(RemoveList,
[RemBB](MachineBasicBlock *BB) {return BB == RemBB;}),
RemoveList.end());
}
// Handle the filter set
if (BlockFilter) {
BlockFilter->erase(RemBB);
}
// Remove the block from loop info.
MLI->removeBlock(RemBB);
// TailDuplicator handles removing it from loops.
DEBUG(dbgs() << "TailDuplicator deleted block: "
<< getBlockName(RemBB) << "\n");
};
auto RemovalCallbackRef =
llvm::function_ref<void(MachineBasicBlock*)>(RemovalCallback);
SmallVector<MachineBasicBlock *, 8> DuplicatedPreds;
TailDup.tailDuplicateAndUpdate(IsSimple, BB, LPred,
&DuplicatedPreds, &RemovalCallbackRef);
// Update UnscheduledPredecessors to reflect tail-duplication.
DuplicatedToLPred = false;
for (MachineBasicBlock *Pred : DuplicatedPreds) {
// We're only looking for unscheduled predecessors that match the filter.
BlockChain* PredChain = BlockToChain[Pred];
if (Pred == LPred)
DuplicatedToLPred = true;
if (Pred == LPred || (BlockFilter && !BlockFilter->count(Pred))
|| PredChain == &Chain)
continue;
for (MachineBasicBlock *NewSucc : Pred->successors()) {
if (BlockFilter && !BlockFilter->count(NewSucc))
continue;
BlockChain *NewChain = BlockToChain[NewSucc];
if (NewChain != &Chain && NewChain != PredChain)
NewChain->UnscheduledPredecessors++;
}
}
return Removed;
}
bool MachineBlockPlacement::runOnMachineFunction(MachineFunction &MF) {
if (skipFunction(*MF.getFunction()))
return false;
@ -1973,13 +1734,6 @@ bool MachineBlockPlacement::runOnMachineFunction(MachineFunction &MF) {
TII = MF.getSubtarget().getInstrInfo();
TLI = MF.getSubtarget().getTargetLowering();
MDT = &getAnalysis<MachineDominatorTree>();
if (TailDupPlacement) {
unsigned TailDupSize = TailDuplicatePlacementThreshold;
if (MF.getFunction()->optForSize())
TailDupSize = 1;
TailDup.initMF(MF, MBPI, /* LayoutMode */ true, TailDupSize);
}
assert(BlockToChain.empty());
buildCFGChains();
@ -1993,7 +1747,8 @@ bool MachineBlockPlacement::runOnMachineFunction(MachineFunction &MF) {
BranchFoldPlacement;
// No tail merging opportunities if the block number is less than four.
if (MF.size() > 3 && EnableTailMerge) {
unsigned TailMergeSize = TailDuplicatePlacementThreshold + 1;
// Default to the standard tail-merge-size option.
unsigned TailMergeSize = 0;
BranchFolder BF(/*EnableTailMerge=*/true, /*CommonHoist=*/false, *MBFI,
*MBPI, TailMergeSize);
@ -2002,8 +1757,6 @@ bool MachineBlockPlacement::runOnMachineFunction(MachineFunction &MF) {
/*AfterBlockPlacement=*/true)) {
// Redo the layout if tail merging creates/removes/moves blocks.
BlockToChain.clear();
// Must redo the dominator tree if blocks were changed.
MDT->runOnMachineFunction(MF);
ChainAllocator.DestroyAll();
buildCFGChains();
}

2
lib/CodeGen/TailDuplication.cpp
View File

@ -49,7 +49,7 @@ bool TailDuplicatePass::runOnMachineFunction(MachineFunction &MF) {
auto MBPI = &getAnalysis<MachineBranchProbabilityInfo>();
Duplicator.initMF(MF, MBPI, /* LayoutMode */ false);
Duplicator.initMF(MF, MBPI);
bool MadeChange = false;
while (Duplicator.tailDuplicateBlocks())

59
lib/CodeGen/TailDuplicator.cpp
View File

@ -20,7 +20,6 @@
#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/Function.h"
@ -65,7 +64,7 @@ static cl::opt<unsigned> TailDupLimit("tail-dup-limit", cl::init(~0U),
void TailDuplicator::initMF(MachineFunction &MFin,
const MachineBranchProbabilityInfo *MBPIin,
bool LayoutModeIn, unsigned TailDupSizeIn) {
unsigned TailDupSizeIn) {
MF = &MFin;
TII = MF->getSubtarget().getInstrInfo();
TRI = MF->getSubtarget().getRegisterInfo();
@ -76,7 +75,6 @@ void TailDuplicator::initMF(MachineFunction &MFin,
assert(MBPI != nullptr && "Machine Branch Probability Info required");
LayoutMode = LayoutModeIn;
PreRegAlloc = MRI->isSSA();
}
@ -129,23 +127,18 @@ static void VerifyPHIs(MachineFunction &MF, bool CheckExtra) {
/// Tail duplicate the block and cleanup.
/// \p IsSimple - return value of isSimpleBB
/// \p MBB - block to be duplicated
/// \p ForcedLayoutPred - If non-null, treat this block as the layout
/// predecessor, instead of using the ordering in MF
/// \p DuplicatedPreds - if non-null, \p DuplicatedPreds will contain a list of
/// all Preds that received a copy of \p MBB.
/// \p RemovalCallback - if non-null, called just before MBB is deleted.
bool TailDuplicator::tailDuplicateAndUpdate(
bool IsSimple, MachineBasicBlock *MBB,
MachineBasicBlock *ForcedLayoutPred,
SmallVectorImpl<MachineBasicBlock*> *DuplicatedPreds,
llvm::function_ref<void(MachineBasicBlock *)> *RemovalCallback) {
SmallVectorImpl<MachineBasicBlock*> *DuplicatedPreds) {
// Save the successors list.
SmallSetVector<MachineBasicBlock *, 8> Succs(MBB->succ_begin(),
MBB->succ_end());
SmallVector<MachineBasicBlock *, 8> TDBBs;
SmallVector<MachineInstr *, 16> Copies;
if (!tailDuplicate(IsSimple, MBB, ForcedLayoutPred, TDBBs, Copies))
if (!tailDuplicate(IsSimple, MBB, TDBBs, Copies))
return false;
++NumTails;
@ -163,7 +156,7 @@ bool TailDuplicator::tailDuplicateAndUpdate(
// If it is dead, remove it.
if (isDead) {
NumTailDupRemoved += MBB->size();
removeDeadBlock(MBB, RemovalCallback);
removeDeadBlock(MBB);
++NumDeadBlocks;
}
@ -262,7 +255,7 @@ bool TailDuplicator::tailDuplicateBlocks() {
if (!shouldTailDuplicate(IsSimple, *MBB))
continue;
MadeChange |= tailDuplicateAndUpdate(IsSimple, MBB, nullptr);
MadeChange |= tailDuplicateAndUpdate(IsSimple, MBB);
}
if (PreRegAlloc && TailDupVerify)
@ -521,10 +514,8 @@ void TailDuplicator::updateSuccessorsPHIs(
/// Determine if it is profitable to duplicate this block.
bool TailDuplicator::shouldTailDuplicate(bool IsSimple,
MachineBasicBlock &TailBB) {
// When doing tail-duplication during layout, the block ordering is in flux,
// so canFallThrough returns a result based on incorrect information and
// should just be ignored.
if (!LayoutMode && TailBB.canFallThrough())
// Only duplicate blocks that end with unconditional branches.
if (TailBB.canFallThrough())
return false;
// Don't try to tail-duplicate single-block loops.
@ -744,7 +735,7 @@ bool TailDuplicator::duplicateSimpleBB(
bool TailDuplicator::canTailDuplicate(MachineBasicBlock *TailBB,
MachineBasicBlock *PredBB) {
// EH edges are ignored by analyzeBranch.
// EH edges are ignored by AnalyzeBranch.
if (PredBB->succ_size() > 1)
return false;
@ -759,16 +750,7 @@ bool TailDuplicator::canTailDuplicate(MachineBasicBlock *TailBB,
/// If it is profitable, duplicate TailBB's contents in each
/// of its predecessors.
/// \p IsSimple result of isSimpleBB
/// \p TailBB Block to be duplicated.
/// \p ForcedLayoutPred When non-null, use this block as the layout predecessor
/// instead of the previous block in MF's order.
/// \p TDBBs A vector to keep track of all blocks tail-duplicated
/// into.
/// \p Copies A vector of copy instructions inserted. Used later to
/// walk all the inserted copies and remove redundant ones.
bool TailDuplicator::tailDuplicate(bool IsSimple, MachineBasicBlock *TailBB,
MachineBasicBlock *ForcedLayoutPred,
SmallVectorImpl<MachineBasicBlock *> &TDBBs,
SmallVectorImpl<MachineInstr *> &Copies) {
DEBUG(dbgs() << "\n*** Tail-duplicating BB#" << TailBB->getNumber() << '\n');
@ -793,12 +775,7 @@ bool TailDuplicator::tailDuplicate(bool IsSimple, MachineBasicBlock *TailBB,
continue;
// Don't duplicate into a fall-through predecessor (at least for now).
bool IsLayoutSuccessor = false;
if (ForcedLayoutPred)
IsLayoutSuccessor = (ForcedLayoutPred == PredBB);
else if (PredBB->isLayoutSuccessor(TailBB) && PredBB->canFallThrough())
IsLayoutSuccessor = true;
if (IsLayoutSuccessor)
if (PredBB->isLayoutSuccessor(TailBB) && PredBB->canFallThrough())
continue;
DEBUG(dbgs() << "\nTail-duplicating into PredBB: " << *PredBB
@ -851,20 +828,16 @@ bool TailDuplicator::tailDuplicate(bool IsSimple, MachineBasicBlock *TailBB,
// If TailBB was duplicated into all its predecessors except for the prior
// block, which falls through unconditionally, move the contents of this
// block into the prior block.
MachineBasicBlock *PrevBB = ForcedLayoutPred;
if (!PrevBB)
PrevBB = &*std::prev(TailBB->getIterator());
MachineBasicBlock *PrevBB = &*std::prev(TailBB->getIterator());
MachineBasicBlock *PriorTBB = nullptr, *PriorFBB = nullptr;
SmallVector<MachineOperand, 4> PriorCond;
// This has to check PrevBB->succ_size() because EH edges are ignored by
// analyzeBranch.
// AnalyzeBranch.
if (PrevBB->succ_size() == 1 &&
// Layout preds are not always CFG preds. Check.
*PrevBB->succ_begin() == TailBB &&
!TII->analyzeBranch(*PrevBB, PriorTBB, PriorFBB, PriorCond, true) &&
PriorCond.empty() &&
(!PriorTBB || PriorTBB == TailBB) &&
TailBB->pred_size() == 1 &&
PriorCond.empty() && !PriorTBB && TailBB->pred_size() == 1 &&
!TailBB->hasAddressTaken()) {
DEBUG(dbgs() << "\nMerging into block: " << *PrevBB
<< "From MBB: " << *TailBB);
@ -891,7 +864,6 @@ bool TailDuplicator::tailDuplicate(bool IsSimple, MachineBasicBlock *TailBB,
}
appendCopies(PrevBB, CopyInfos, Copies);
} else {
TII->removeBranch(*PrevBB);
// No PHIs to worry about, just splice the instructions over.
PrevBB->splice(PrevBB->end(), TailBB, TailBB->begin(), TailBB->end());
}
@ -964,15 +936,10 @@ void TailDuplicator::appendCopies(MachineBasicBlock *MBB,
/// Remove the specified dead machine basic block from the function, updating
/// the CFG.
void TailDuplicator::removeDeadBlock(
MachineBasicBlock *MBB,
llvm::function_ref<void(MachineBasicBlock *)> *RemovalCallback) {
void TailDuplicator::removeDeadBlock(MachineBasicBlock *MBB) {
assert(MBB->pred_empty() && "MBB must be dead!");
DEBUG(dbgs() << "\nRemoving MBB: " << *MBB);
if (RemovalCallback)
(*RemovalCallback)(MBB);
// Remove all successors.
while (!MBB->succ_empty())
MBB->removeSuccessor(MBB->succ_end() - 1);

1
test/CodeGen/AArch64/arm64-extload-knownzero.ll
View File

@ -12,6 +12,7 @@ bb1:
%tmp2 = load i16, i16* %ptr, align 2
br label %bb2
bb2:
; CHECK: %bb2
; CHECK-NOT: and {{w[0-9]+}}, [[REG]], #0xffff
; CHECK: cmp [[REG]], #23
%tmp3 = phi i16 [ 0, %entry ], [ %tmp2, %bb1 ]

6
test/CodeGen/AArch64/machine_cse.ll
View File

@ -1,8 +1,4 @@
; RUN: llc < %s -mtriple=aarch64-linux-gnuabi -O2 -tail-dup-placement=0 | FileCheck %s
; -tail-dup-placement causes tail duplication during layout. This breaks the
; assumptions of the test case as written (specifically, it creates an
; additional cmp instruction, creating a false positive), so we pass
; -tail-dup-placement=0 to restore the original behavior
; RUN: llc < %s -mtriple=aarch64-linux-gnuabi -O2 | FileCheck %s
; marked as external to prevent possible optimizations
@a = external global i32

1
test/CodeGen/ARM/2011-03-23-PeepholeBug.ll
View File

@ -25,6 +25,7 @@ bb1: ; preds = %bb
br label %bb2
bb2: ; preds = %bb1, %entry
; CHECK: bb2
; CHECK: cmp [[REG]], #0
; CHECK: ble
%indvar = phi i32 [ %indvar.next, %bb1 ], [ 0, %entry ]

16
test/CodeGen/PowerPC/branch-opt.ll
View File

@ -1,21 +1,9 @@
; RUN: llc -verify-machineinstrs < %s -march=ppc32 | FileCheck %s
; RUN: llc -verify-machineinstrs < %s -march=ppc32 | \
; RUN: grep "b LBB.*" | count 4
target datalayout = "E-p:32:32"
target triple = "powerpc-apple-darwin8.7.0"
;CHECK-LABEL: foo:
; There are 4 inner loops (%bb, %bb12, %bb25, %bb38) that all exit to %cond_next48
; The last (whichever it is) should have a fallthrough exit, and the other three
; need an unconditional branch. No other block should have an unconditional
; branch to cond_next48
; One of the blocks ends up with a loop exit block that gets a tail-duplicated copy
; of %cond_next48, so there should only be two unconditional branches.
;CHECK: b LBB0_13
;CHECK: b LBB0_13
;CHECK-NOT: b LBB0_13
;CHECK: LBB0_13: ; %cond_next48
define void @foo(i32 %W, i32 %X, i32 %Y, i32 %Z) {
entry:
%tmp1 = and i32 %W, 1 ; <i32> [#uses=1]

18
test/CodeGen/PowerPC/sjlj.ll
View File

@ -74,24 +74,24 @@ return: ; preds = %if.end, %if.then
; CHECK-DAG: std [[REGA]], [[OFF:[0-9]+]](31) # 8-byte Folded Spill
; CHECK-DAG: std 1, 16([[REGA]])
; CHECK-DAG: std 2, 24([[REGA]])
; CHECK: bcl 20, 31, .LBB1_3
; CHECK: bcl 20, 31, .LBB1_5
; CHECK: li 3, 1
; CHECK: #EH_SjLj_Setup .LBB1_3
; CHECK: #EH_SjLj_Setup .LBB1_5
; CHECK: b .LBB1_1
; CHECK: .LBB1_3:
; CHECK: mflr [[REGL:[0-9]+]]
; CHECK: ld [[REG2:[0-9]+]], [[OFF]](31) # 8-byte Folded Reload
; CHECK: std [[REGL]], 8([[REG2]])
; CHECK: li 3, 0
; CHECK: .LBB1_5:
; CHECK: .LBB1_4:
; CHECK: lfd
; CHECK: lvx
; CHECK: ld
; CHECK: blr
; CHECK: .LBB1_5:
; CHECK: mflr [[REGL:[0-9]+]]
; CHECK: ld [[REG2:[0-9]+]], [[OFF]](31) # 8-byte Folded Reload
; CHECK: std [[REGL]], 8([[REG2]])
; CHECK: li 3, 0
; CHECK-NOAV: @main
; CHECK-NOAV-NOT: stvx
; CHECK-NOAV: bcl

100
test/CodeGen/PowerPC/tail-dup-layout.ll
View File

@ -1,100 +0,0 @@
; RUN: llc -outline-optional-branches -O2 < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-n32:64"
target triple = "powerpc64le-grtev4-linux-gnu"
; Intended layout:
; The outlining flag produces the layout
; test1
; test2
; test3
; test4
; exit
; optional1
; optional2
; optional3
; optional4
; Tail duplication puts test n+1 at the end of optional n
; so optional1 includes a copy of test2 at the end, and branches
; to test3 (at the top) or falls through to optional 2.
; The CHECK statements check for the whole string of tests and exit block,
; and then check that the correct test has been duplicated into the end of
; the optional blocks and that the optional blocks are in the correct order.
;CHECK-LABEL: f:
; test1 may have been merged with entry
;CHECK: mr [[TAGREG:[0-9]+]], 3
;CHECK: andi. {{[0-9]+}}, [[TAGREG]], 1
;CHECK-NEXT: bc 12, 1, [[OPT1LABEL:[._0-9A-Za-z]+]]
;CHECK-NEXT: [[TEST2LABEL:[._0-9A-Za-z]+]]: # %test2
;CHECK-NEXT: rlwinm. {{[0-9]+}}, [[TAGREG]], 0, 30, 30
;CHECK-NEXT: bne 0, [[OPT2LABEL:[._0-9A-Za-z]+]]
;CHECK-NEXT: [[TEST3LABEL:[._0-9A-Za-z]+]]: # %test3
;CHECK-NEXT: rlwinm. {{[0-9]+}}, [[TAGREG]], 0, 29, 29
;CHECK-NEXT: bne 0, .[[OPT3LABEL:[._0-9A-Za-z]+]]
;CHECK-NEXT: [[TEST4LABEL:[._0-9A-Za-z]+]]: # %test4
;CHECK-NEXT: rlwinm. {{[0-9]+}}, [[TAGREG]], 0, 28, 28
;CHECK-NEXT: bne 0, .[[OPT4LABEL:[._0-9A-Za-z]+]]
;CHECK-NEXT: [[EXITLABEL:[._0-9A-Za-z]+]]: # %exit
;CHECK: blr
;CHECK-NEXT: [[OPT1LABEL]]
;CHECK: rlwinm. {{[0-9]+}}, [[TAGREG]], 0, 30, 30
;CHECK-NEXT: beq 0, [[TEST3LABEL]]
;CHECK-NEXT: [[OPT2LABEL]]
;CHECK: rlwinm. {{[0-9]+}}, [[TAGREG]], 0, 29, 29
;CHECK-NEXT: beq 0, [[TEST4LABEL]]
;CHECK-NEXT: [[OPT3LABEL]]
;CHECK: rlwinm. {{[0-9]+}}, [[TAGREG]], 0, 28, 28
;CHECK-NEXT: beq 0, [[EXITLABEL]]
;CHECK-NEXT: [[OPT4LABEL]]
;CHECK: b [[EXITLABEL]]
define void @f(i32 %tag) {
entry:
br label %test1
test1:
%tagbit1 = and i32 %tag, 1
%tagbit1eq0 = icmp eq i32 %tagbit1, 0
br i1 %tagbit1eq0, label %test2, label %optional1
optional1:
call void @a()
call void @a()
call void @a()
call void @a()
br label %test2
test2:
%tagbit2 = and i32 %tag, 2
%tagbit2eq0 = icmp eq i32 %tagbit2, 0
br i1 %tagbit2eq0, label %test3, label %optional2
optional2:
call void @b()
call void @b()
call void @b()
call void @b()
br label %test3
test3:
%tagbit3 = and i32 %tag, 4
%tagbit3eq0 = icmp eq i32 %tagbit3, 0
br i1 %tagbit3eq0, label %test4, label %optional3
optional3:
call void @c()
call void @c()
call void @c()
call void @c()
br label %test4
test4:
%tagbit4 = and i32 %tag, 8
%tagbit4eq0 = icmp eq i32 %tagbit4, 0
br i1 %tagbit4eq0, label %exit, label %optional4
optional4:
call void @d()
call void @d()
call void @d()
call void @d()
br label %exit
exit:
ret void
}
declare void @a()
declare void @b()
declare void @c()
declare void @d()

2
test/CodeGen/WebAssembly/cfg-stackify.ll
View File

@ -1,5 +1,5 @@
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -disable-block-placement -verify-machineinstrs -fast-isel=false | FileCheck %s
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -tail-dup-placement=0 -verify-machineinstrs -fast-isel=false | FileCheck -check-prefix=OPT %s
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -verify-machineinstrs -fast-isel=false | FileCheck -check-prefix=OPT %s
; Test the CFG stackifier pass.

2
test/CodeGen/WebAssembly/mem-intrinsics.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -tail-dup-placement=0| FileCheck %s
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt | FileCheck %s
; Test memcpy, memmove, and memset intrinsics.

10
test/CodeGen/X86/block-placement.ll
View File

@ -177,12 +177,6 @@ exit:
ret i32 %sum
}
; Tail duplication during layout can entirely remove body0 by duplicating it
; into the entry block and into body1. This is a good thing but it isn't what
; this test is looking for. So to make the blocks longer so they don't get
; duplicated, we add some calls to dummy.
declare void @dummy()
define i32 @test_loop_rotate(i32 %i, i32* %a) {
; Check that we rotate conditional exits from the loop to the bottom of the
; loop, eliminating unconditional branches to the top.
@ -200,8 +194,6 @@ body0:
%base = phi i32 [ 0, %entry ], [ %sum, %body1 ]
%next = add i32 %iv, 1
%exitcond = icmp eq i32 %next, %i
call void @dummy()
call void @dummy()
br i1 %exitcond, label %exit, label %body1
body1:
@ -953,7 +945,7 @@ define void @benchmark_heapsort(i32 %n, double* nocapture %ra) {
; First rotated loop top.
; CHECK: .p2align
; CHECK: %while.end
; %for.cond gets completely tail-duplicated away.
; CHECK: %for.cond
; CHECK: %if.then
; CHECK: %if.else
; CHECK: %if.end10

4
test/CodeGen/X86/cmov-into-branch.ll
View File

@ -105,11 +105,9 @@ define i32 @weighted_select3(i32 %a, i32 %b) {
; CHECK-NEXT: testl %edi, %edi
; CHECK-NEXT: je [[LABEL_BB6:.*]]
; CHECK: movl %edi, %eax
; CHECK-NEXT: retq
; CHECK: [[LABEL_BB6]]
; CHECK-NEXT: movl %esi, %edi
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: retq
; CHECK-NEXT: jmp
;
%cmp = icmp ne i32 %a, 0
%sel = select i1 %cmp, i32 %a, i32 %b, !prof !2

24
test/CodeGen/X86/fma-intrinsics-phi-213-to-231.ll
View File

@ -2,7 +2,7 @@
; CHECK-LABEL: fmaddsubpd_loop_128:
; CHECK: vfmaddsub231pd %xmm1, %xmm0, %xmm2
; CHECK: vmovapd %xmm2, %xmm0
; CHECK: vmovaps %xmm2, %xmm0
; CHECK-NEXT: retq
define <2 x double> @fmaddsubpd_loop_128(i32 %iter, <2 x double> %a, <2 x double> %b, <2 x double> %c) {
entry:
@ -28,7 +28,7 @@ for.end:
; CHECK-LABEL: fmsubaddpd_loop_128:
; CHECK: vfmsubadd231pd %xmm1, %xmm0, %xmm2
; CHECK: vmovapd %xmm2, %xmm0
; CHECK: vmovaps %xmm2, %xmm0
; CHECK-NEXT: retq
define <2 x double> @fmsubaddpd_loop_128(i32 %iter, <2 x double> %a, <2 x double> %b, <2 x double> %c) {
entry:
@ -54,7 +54,7 @@ for.end:
; CHECK-LABEL: fmaddpd_loop_128:
; CHECK: vfmadd231pd %xmm1, %xmm0, %xmm2
; CHECK: vmovapd %xmm2, %xmm0
; CHECK: vmovaps %xmm2, %xmm0
; CHECK-NEXT: retq
define <2 x double> @fmaddpd_loop_128(i32 %iter, <2 x double> %a, <2 x double> %b, <2 x double> %c) {
entry:
@ -80,7 +80,7 @@ for.end:
; CHECK-LABEL: fmsubpd_loop_128:
; CHECK: vfmsub231pd %xmm1, %xmm0, %xmm2
; CHECK: vmovapd %xmm2, %xmm0
; CHECK: vmovaps %xmm2, %xmm0
; CHECK-NEXT: retq
define <2 x double> @fmsubpd_loop_128(i32 %iter, <2 x double> %a, <2 x double> %b, <2 x double> %c) {
entry:
@ -106,7 +106,7 @@ for.end:
; CHECK-LABEL: fnmaddpd_loop_128:
; CHECK: vfnmadd231pd %xmm1, %xmm0, %xmm2
; CHECK: vmovapd %xmm2, %xmm0
; CHECK: vmovaps %xmm2, %xmm0
; CHECK-NEXT: retq
define <2 x double> @fnmaddpd_loop_128(i32 %iter, <2 x double> %a, <2 x double> %b, <2 x double> %c) {
entry:
@ -132,7 +132,7 @@ for.end:
; CHECK-LABEL: fnmsubpd_loop_128:
; CHECK: vfnmsub231pd %xmm1, %xmm0, %xmm2
; CHECK: vmovapd %xmm2, %xmm0
; CHECK: vmovaps %xmm2, %xmm0
; CHECK-NEXT: retq
define <2 x double> @fnmsubpd_loop_128(i32 %iter, <2 x double> %a, <2 x double> %b, <2 x double> %c) {
entry:
@ -329,7 +329,7 @@ declare <4 x float> @llvm.x86.fma.vfnmsub.ps(<4 x float>, <4 x float>, <4 x floa
; CHECK-LABEL: fmaddsubpd_loop_256:
; CHECK: vfmaddsub231pd %ymm1, %ymm0, %ymm2
; CHECK: vmovapd %ymm2, %ymm0
; CHECK: vmovaps %ymm2, %ymm0
; CHECK-NEXT: retq
define <4 x double> @fmaddsubpd_loop_256(i32 %iter, <4 x double> %a, <4 x double> %b, <4 x double> %c) {
entry:
@ -355,7 +355,7 @@ for.end:
; CHECK-LABEL: fmsubaddpd_loop_256:
; CHECK: vfmsubadd231pd %ymm1, %ymm0, %ymm2
; CHECK: vmovapd %ymm2, %ymm0
; CHECK: vmovaps %ymm2, %ymm0
; CHECK-NEXT: retq
define <4 x double> @fmsubaddpd_loop_256(i32 %iter, <4 x double> %a, <4 x double> %b, <4 x double> %c) {
entry:
@ -381,7 +381,7 @@ for.end:
; CHECK-LABEL: fmaddpd_loop_256:
; CHECK: vfmadd231pd %ymm1, %ymm0, %ymm2
; CHECK: vmovapd %ymm2, %ymm0
; CHECK: vmovaps %ymm2, %ymm0
; CHECK-NEXT: retq
define <4 x double> @fmaddpd_loop_256(i32 %iter, <4 x double> %a, <4 x double> %b, <4 x double> %c) {
entry:
@ -407,7 +407,7 @@ for.end:
; CHECK-LABEL: fmsubpd_loop_256:
; CHECK: vfmsub231pd %ymm1, %ymm0, %ymm2
; CHECK: vmovapd %ymm2, %ymm0
; CHECK: vmovaps %ymm2, %ymm0
; CHECK-NEXT: retq
define <4 x double> @fmsubpd_loop_256(i32 %iter, <4 x double> %a, <4 x double> %b, <4 x double> %c) {
entry:
@ -433,7 +433,7 @@ for.end:
; CHECK-LABEL: fnmaddpd_loop_256:
; CHECK: vfnmadd231pd %ymm1, %ymm0, %ymm2
; CHECK: vmovapd %ymm2, %ymm0
; CHECK: vmovaps %ymm2, %ymm0
; CHECK-NEXT: retq
define <4 x double> @fnmaddpd_loop_256(i32 %iter, <4 x double> %a, <4 x double> %b, <4 x double> %c) {
entry:
@ -459,7 +459,7 @@ for.end:
; CHECK-LABEL: fnmsubpd_loop_256:
; CHECK: vfnmsub231pd %ymm1, %ymm0, %ymm2
; CHECK: vmovapd %ymm2, %ymm0
; CHECK: vmovaps %ymm2, %ymm0
; CHECK-NEXT: retq
define <4 x double> @fnmsubpd_loop_256(i32 %iter, <4 x double> %a, <4 x double> %b, <4 x double> %c) {
entry:

4
test/CodeGen/X86/fp-une-cmp.ll
View File

@ -56,11 +56,11 @@ define double @profile_metadata(double %x, double %y) {
; CHECK-NEXT: ucomisd %xmm1, %xmm0
; CHECK-NEXT: jne .LBB1_1
; CHECK-NEXT: jp .LBB1_1
; CHECK-NEXT: # %bb2
; CHECK-NEXT: .LBB1_2: # %bb2
; CHECK-NEXT: retq
; CHECK-NEXT: .LBB1_1: # %bb1
; CHECK-NEXT: addsd {{.*}}(%rip), %xmm0
; CHECK-NEXT: retq
; CHECK-NEXT: jmp .LBB1_2
entry:
%mul = fmul double %x, %y

5
test/CodeGen/X86/pr11202.ll
View File

@ -15,8 +15,5 @@ l2: ; preds = %l1
br label %l1
}
; It is correct for either l1 or l2 to be removed.
; If l2 is removed, the message should be "Address of block that was removed by CodeGen"
; If l1 is removed, it should be "Block address taken."
; CHECK: .Ltmp0: # {{Address of block that was removed by CodeGen|Block address taken}}
; CHECK: .Ltmp0: # Address of block that was removed by CodeGen
; CHECK: .quad .Ltmp0

22
test/CodeGen/X86/ragreedy-bug.ll
View File

@ -3,34 +3,16 @@
; This testing case is reduced from 197.parser prune_match function.
; We make sure register copies are not generated on isupper.exit blocks.
; isupper.exit and isupper.exit223 get tail-duplicated into all their
; predecessors.
; CHECK: cond.true.i.i
; CHECK: isupper.exit
; CHECK-NEXT: in Loop
; Mem-move
; CHECK-NEXT: movl
; CHECK-NEXT: andl
; CHECK-NEXT: testl
; CHECK-NEXT: jne
; CHECK: cond.true.i.i217
; CHECK: isupper.exit
; CHECK-NEXT: in Loop
; Mem-move
; CHECK-NEXT: movl
; CHECK-NEXT: andl
; CHECK-NEXT: testl
; CHECK-NEXT: je
; CHECK: cond.false.i.i
; CHECK: maskrune
; CHECK-NEXT: movzbl
; CHECK-NEXT: movzbl
; CHECK-NEXT: testl
; CHECK-NEXT: je
; CHECK: cond.false.i.i219
; CHECK: maskrune
; CHECK-NEXT: movzbl
; CHECK-NEXT: movzbl
; CHECK-NEXT: testl
; CHECK-NEXT: jne
%struct.List_o_links_struct = type { i32, i32, i32, %struct.List_o_links_struct* }
%struct.Connector_struct = type { i16, i16, i8, i8, %struct.Connector_struct*, i8* }

28
test/CodeGen/X86/sse1.ll
View File

@ -58,23 +58,21 @@ define <4 x float> @vselect(<4 x float>*%p, <4 x i32> %q) {
; X32-NEXT: je .LBB1_1
; X32-NEXT: # BB#2: # %entry
; X32-NEXT: xorps %xmm1, %xmm1
; X32-NEXT: cmpl $0, {{[0-9]+}}(%esp)
; X32-NEXT: jne .LBB1_5
; X32-NEXT: jmp .LBB1_4
; X32-NEXT: jmp .LBB1_3
; X32-NEXT: .LBB1_1:
; X32-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
; X32-NEXT: .LBB1_3: # %entry
; X32-NEXT: cmpl $0, {{[0-9]+}}(%esp)
; X32-NEXT: je .LBB1_4
; X32-NEXT: .LBB1_5: # %entry
; X32-NEXT: # BB#5: # %entry
; X32-NEXT: xorps %xmm2, %xmm2
; X32-NEXT: cmpl $0, {{[0-9]+}}(%esp)
; X32-NEXT: jne .LBB1_8
; X32-NEXT: jmp .LBB1_7
; X32-NEXT: jmp .LBB1_6
; X32-NEXT: .LBB1_4:
; X32-NEXT: movss {{.*#+}} xmm2 = mem[0],zero,zero,zero
; X32-NEXT: .LBB1_6: # %entry
; X32-NEXT: cmpl $0, {{[0-9]+}}(%esp)
; X32-NEXT: je .LBB1_7
; X32-NEXT: .LBB1_8: # %entry
; X32-NEXT: # BB#8: # %entry
; X32-NEXT: xorps %xmm3, %xmm3
; X32-NEXT: jmp .LBB1_9
; X32-NEXT: .LBB1_7:
@ -97,23 +95,21 @@ define <4 x float> @vselect(<4 x float>*%p, <4 x i32> %q) {
; X64-NEXT: je .LBB1_1
; X64-NEXT: # BB#2: # %entry
; X64-NEXT: xorps %xmm1, %xmm1
; X64-NEXT: testl %edx, %edx
; X64-NEXT: jne .LBB1_5
; X64-NEXT: jmp .LBB1_4
; X64-NEXT: jmp .LBB1_3
; X64-NEXT: .LBB1_1:
; X64-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
; X64-NEXT: .LBB1_3: # %entry
; X64-NEXT: testl %edx, %edx
; X64-NEXT: je .LBB1_4
; X64-NEXT: .LBB1_5: # %entry
; X64-NEXT: # BB#5: # %entry
; X64-NEXT: xorps %xmm2, %xmm2
; X64-NEXT: testl %r8d, %r8d
; X64-NEXT: jne .LBB1_8
; X64-NEXT: jmp .LBB1_7
; X64-NEXT: jmp .LBB1_6
; X64-NEXT: .LBB1_4:
; X64-NEXT: movss {{.*#+}} xmm2 = mem[0],zero,zero,zero
; X64-NEXT: .LBB1_6: # %entry
; X64-NEXT: testl %r8d, %r8d
; X64-NEXT: je .LBB1_7
; X64-NEXT: .LBB1_8: # %entry
; X64-NEXT: # BB#8: # %entry
; X64-NEXT: xorps %xmm3, %xmm3
; X64-NEXT: jmp .LBB1_9
; X64-NEXT: .LBB1_7:

53
test/CodeGen/X86/tail-dup-repeat.ll
View File

@ -1,53 +0,0 @@
; RUN: llc -O2 -tail-dup-placement-threshold=4 -o - %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: uwtable
; When tail-duplicating during placement, we work backward from blocks with
; multiple successors. In this case, the block dup1 gets duplicated into dup2
; and if.then64, and then the block dup2 gets duplicated into land.lhs.true
; and if.end70
; CHECK-LABEL: repeated_tail_dup:
define void @repeated_tail_dup(i1 %a1, i1 %a2, i32* %a4, i32* %a5, i8* %a6) #0 align 2 {
entry:
br label %for.cond
; CHECK: {{^}}.[[HEADER:LBB0_[1-9]]]: # %for.cond
for.cond: ; preds = %dup1, %entry
br i1 %a1, label %land.lhs.true, label %if.end56
land.lhs.true: ; preds = %for.cond
store i32 10, i32* %a4, align 8
br label %dup2
if.end56: ; preds = %for.cond
br i1 %a2, label %if.then64, label %if.end70
if.then64: ; preds = %if.end56
store i8 1, i8* %a6, align 1
br label %dup1
; CHECK: # %if.end70
; CHECK-NEXT: # in Loop:
; CHECK-NEXT: movl $12, (%rdx)
; CHECK-NEXT: movl $2, (%rcx)
; CHECK-NEXT: testl %eax, %eax
; CHECK-NEXT: je .[[HEADER]]
if.end70: ; preds = %if.end56
store i32 12, i32* %a4, align 8
br label %dup2
dup2: ; preds = %if.end70, %land.lhs.true
store i32 2, i32* %a5, align 4
br label %dup1
dup1: ; preds = %dup2, %if.then64
%val = load i32, i32* %a4, align 8
%switch = icmp ult i32 undef, 1
br i1 %switch, label %for.cond, label %for.end
for.end: ; preds = %dup1
ret void
}
attributes #0 = { uwtable }

22
test/CodeGen/X86/update-terminator.mir
View File

@ -5,30 +5,17 @@
@a = external global i16
@b = external global i32
declare void @dummy1()
declare void @dummy2()
declare void @dummy3()
; Function Attrs: nounwind
define void @f2() {
br i1 undef, label %bb1, label %bb3
bb1:
call void @dummy1()
call void @dummy1()
call void @dummy1()
br i1 undef, label %bb2, label %bb2
bb2:
call void @dummy2()
call void @dummy2()
call void @dummy2()
br label %bb4
bb3:
call void @dummy3()
call void @dummy3()
call void @dummy3()
br label %bb2
bb4:
@ -53,24 +40,15 @@ body: |
bb.1:
successors: %bb.2(100)
CALL64pcrel32 @dummy1, csr_64, implicit %rsp, implicit-def %rsp
CALL64pcrel32 @dummy1, csr_64, implicit %rsp, implicit-def %rsp
CALL64pcrel32 @dummy1, csr_64, implicit %rsp, implicit-def %rsp
JNE_1 %bb.2, implicit %eflags
bb.2:
successors: %bb.4(100)
CALL64pcrel32 @dummy2, csr_64, implicit %rsp, implicit-def %rsp
CALL64pcrel32 @dummy2, csr_64, implicit %rsp, implicit-def %rsp
CALL64pcrel32 @dummy2, csr_64, implicit %rsp, implicit-def %rsp
JMP_1 %bb.4
bb.3:
successors: %bb.2(100)
CALL64pcrel32 @dummy3, csr_64, implicit %rsp, implicit-def %rsp
CALL64pcrel32 @dummy3, csr_64, implicit %rsp, implicit-def %rsp
CALL64pcrel32 @dummy3, csr_64, implicit %rsp, implicit-def %rsp
JMP_1 %bb.2
bb.4: