[llvm] r265388 - Adds the ability to use an epilog remainder loop during loop unrolling and makes

Michael Zolotukhin via llvm-commits llvm-commits at lists.llvm.org
Wed Apr 20 11:41:43 PDT 2016


Hi,

Could we change the default value to the original one until this 90% regression is addressed?

Thanks,
Michael

> On Apr 15, 2016, at 12:37 PM, Mikhail Zolotukhin <mzolotukhin at apple.com> wrote:
> 
>> 
>> On Apr 8, 2016, at 5:39 PM, Evgeny Stupachenko <evstupac at gmail.com> wrote:
>> 
>> Investigation showed that the regression is most likely LSR related,
>> but not loop unroll.
>> I was able to reproduce it only in 32 bit mode, 64 bit mode epilog is
>> ~30% faster.
>> 
>> Going back to the changes in the test. Epilog variant has 1 move more
>> in the hottest loop (which is redundant and should be deleted) and use
>> constant address in moves inside the loop. However manual deleting of
>> the move does not give any significant performance gain.
>> The different behavior of LSR comes from additional inductive variable
>> in unrolled loop. For Epilog case we add "k" (supposed to be
>> eliminated after LSR):
>> 
>> k = n - n % (unroll factor));
>> ...
>> access a[i];
>> i++;
>> k--;
>> if (!k) break;
>> 
>> Moving code of the loop modifying "palign" before loop showed up to 2
>> times perf difference. So most likely epilog unroll itself does not
>> influence on performance here.
>> However, the fact that LSR leave constant address inside the loop
>> moves (making them much longer), should be addressed to LSR. I'll
>> submit a bug report on this.
> Hi Evgeny,
> 
> Could you please post the PR number here as well?
> 
> Michael
>> 
>> 
>> On Fri, Apr 8, 2016 at 2:09 PM, Evgeny Stupachenko <evstupac at gmail.com> wrote:
>>> Hi Michael,
>>> 
>>> Yes I do have the data.
>>> There were ~10% improvements on some EEMBC tests; spec2000 performance
>>> was almost flat (within 2%).
>>> 
>>> Let me look into BubbleSort case and come back with analysis and
>>> possible improvement.
>>> 
>>> Thanks,
>>> Evgeny
>>> 
>>> 
>>> On Fri, Apr 8, 2016 at 1:23 PM, Michael Zolotukhin via llvm-commits
>>> <llvm-commits at lists.llvm.org> wrote:
>>>> Hi Evgeny,
>>>> 
>>>> We’ve found several performance regressions on LLVM testsuite caused by this patch. Do you have a data from your performance experiments to back-up the decision to make epilogues the default strategy?
>>>> 
>>>> One of the biggest regressions we see is 89% on SingleSource/Benchmarks/Stanford/Bubblesort (on x86), while the biggest gain is only 30%.
>>>> 
>>>> Thanks,
>>>> Michael
>>>> 
>>>> 
>>>>> On Apr 5, 2016, at 5:19 AM, David L Kreitzer via llvm-commits <llvm-commits at lists.llvm.org> wrote:
>>>>> 
>>>>> Author: dlkreitz
>>>>> Date: Tue Apr  5 07:19:35 2016
>>>>> New Revision: 265388
>>>>> 
>>>>> URL: http://llvm.org/viewvc/llvm-project?rev=265388&view=rev
>>>>> Log:
>>>>> Adds the ability to use an epilog remainder loop during loop unrolling and makes
>>>>> this the default behavior.
>>>>> 
>>>>> Patch by Evgeny Stupachenko (evstupac at gmail.com).
>>>>> 
>>>>> Differential Revision: http://reviews.llvm.org/D18158
>>>>> 
>>>>> Modified:
>>>>>  llvm/trunk/include/llvm/Transforms/Utils/UnrollLoop.h
>>>>>  llvm/trunk/lib/Transforms/Utils/LoopUnroll.cpp
>>>>>  llvm/trunk/lib/Transforms/Utils/LoopUnrollRuntime.cpp
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/AArch64/runtime-loop.ll
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/PowerPC/a2-unrolling.ll
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/X86/mmx.ll
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/runtime-loop.ll
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/runtime-loop1.ll
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/runtime-loop2.ll
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/runtime-loop4.ll
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/runtime-loop5.ll
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/tripcount-overflow.ll
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/unroll-cleanup.ll
>>>>>  llvm/trunk/test/Transforms/LoopUnroll/unroll-pragmas.ll
>>>>> 
>>>>> Modified: llvm/trunk/include/llvm/Transforms/Utils/UnrollLoop.h
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Transforms/Utils/UnrollLoop.h?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/include/llvm/Transforms/Utils/UnrollLoop.h (original)
>>>>> +++ llvm/trunk/include/llvm/Transforms/Utils/UnrollLoop.h Tue Apr  5 07:19:35 2016
>>>>> @@ -34,10 +34,11 @@ bool UnrollLoop(Loop *L, unsigned Count,
>>>>>               LoopInfo *LI, ScalarEvolution *SE, DominatorTree *DT,
>>>>>               AssumptionCache *AC, bool PreserveLCSSA);
>>>>> 
>>>>> -bool UnrollRuntimeLoopProlog(Loop *L, unsigned Count,
>>>>> -                             bool AllowExpensiveTripCount, LoopInfo *LI,
>>>>> -                             ScalarEvolution *SE, DominatorTree *DT,
>>>>> -                             bool PreserveLCSSA);
>>>>> +bool UnrollRuntimeLoopRemainder(Loop *L, unsigned Count,
>>>>> +                                bool AllowExpensiveTripCount,
>>>>> +                                bool UseEpilogRemainder, LoopInfo *LI,
>>>>> +                                ScalarEvolution *SE, DominatorTree *DT,
>>>>> +                                bool PreserveLCSSA);
>>>>> 
>>>>> MDNode *GetUnrollMetadata(MDNode *LoopID, StringRef Name);
>>>>> }
>>>>> 
>>>>> Modified: llvm/trunk/lib/Transforms/Utils/LoopUnroll.cpp
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/LoopUnroll.cpp?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/lib/Transforms/Utils/LoopUnroll.cpp (original)
>>>>> +++ llvm/trunk/lib/Transforms/Utils/LoopUnroll.cpp Tue Apr  5 07:19:35 2016
>>>>> @@ -44,6 +44,11 @@ using namespace llvm;
>>>>> STATISTIC(NumCompletelyUnrolled, "Number of loops completely unrolled");
>>>>> STATISTIC(NumUnrolled, "Number of loops unrolled (completely or otherwise)");
>>>>> 
>>>>> +static cl::opt<bool>
>>>>> +UnrollRuntimeEpilog("unroll-runtime-epilog", cl::init(true), cl::Hidden,
>>>>> +                    cl::desc("Allow runtime unrolled loops to be unrolled "
>>>>> +                             "with epilog instead of prolog."));
>>>>> +
>>>>> /// Convert the instruction operands from referencing the current values into
>>>>> /// those specified by VMap.
>>>>> static inline void remapInstruction(Instruction *I,
>>>>> @@ -288,12 +293,13 @@ bool llvm::UnrollLoop(Loop *L, unsigned
>>>>>              "convergent "
>>>>>              "operation.");
>>>>>     });
>>>>> -  // Don't output the runtime loop prolog if Count is a multiple of
>>>>> -  // TripMultiple.  Such a prolog is never needed, and is unsafe if the loop
>>>>> +  // Don't output the runtime loop remainder if Count is a multiple of
>>>>> +  // TripMultiple.  Such a remainder is never needed, and is unsafe if the loop
>>>>> // contains a convergent instruction.
>>>>> if (RuntimeTripCount && TripMultiple % Count != 0 &&
>>>>> -      !UnrollRuntimeLoopProlog(L, Count, AllowExpensiveTripCount, LI, SE, DT,
>>>>> -                               PreserveLCSSA))
>>>>> +      !UnrollRuntimeLoopRemainder(L, Count, AllowExpensiveTripCount,
>>>>> +                                  UnrollRuntimeEpilog, LI, SE, DT,
>>>>> +                                  PreserveLCSSA))
>>>>>   return false;
>>>>> 
>>>>> // Notify ScalarEvolution that the loop will be substantially changed,
>>>>> 
>>>>> Modified: llvm/trunk/lib/Transforms/Utils/LoopUnrollRuntime.cpp
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/LoopUnrollRuntime.cpp?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/lib/Transforms/Utils/LoopUnrollRuntime.cpp (original)
>>>>> +++ llvm/trunk/lib/Transforms/Utils/LoopUnrollRuntime.cpp Tue Apr  5 07:19:35 2016
>>>>> @@ -16,8 +16,8 @@
>>>>> // case, we need to generate code to execute these 'left over' iterations.
>>>>> //
>>>>> // The current strategy generates an if-then-else sequence prior to the
>>>>> -// unrolled loop to execute the 'left over' iterations.  Other strategies
>>>>> -// include generate a loop before or after the unrolled loop.
>>>>> +// unrolled loop to execute the 'left over' iterations before or after the
>>>>> +// unrolled loop.
>>>>> //
>>>>> //===----------------------------------------------------------------------===//
>>>>> 
>>>>> @@ -60,33 +60,35 @@ STATISTIC(NumRuntimeUnrolled,
>>>>> ///   than the unroll factor.
>>>>> ///
>>>>> static void ConnectProlog(Loop *L, Value *BECount, unsigned Count,
>>>>> -                          BasicBlock *LastPrologBB, BasicBlock *PrologEnd,
>>>>> -                          BasicBlock *OrigPH, BasicBlock *NewPH,
>>>>> -                          ValueToValueMapTy &VMap, DominatorTree *DT,
>>>>> -                          LoopInfo *LI, bool PreserveLCSSA) {
>>>>> +                          BasicBlock *PrologExit, BasicBlock *PreHeader,
>>>>> +                          BasicBlock *NewPreHeader, ValueToValueMapTy &VMap,
>>>>> +                          DominatorTree *DT, LoopInfo *LI, bool PreserveLCSSA) {
>>>>> BasicBlock *Latch = L->getLoopLatch();
>>>>> assert(Latch && "Loop must have a latch");
>>>>> +  BasicBlock *PrologLatch = cast<BasicBlock>(VMap[Latch]);
>>>>> 
>>>>> // Create a PHI node for each outgoing value from the original loop
>>>>> // (which means it is an outgoing value from the prolog code too).
>>>>> // The new PHI node is inserted in the prolog end basic block.
>>>>> -  // The new PHI name is added as an operand of a PHI node in either
>>>>> +  // The new PHI node value is added as an operand of a PHI node in either
>>>>> // the loop header or the loop exit block.
>>>>> -  for (succ_iterator SBI = succ_begin(Latch), SBE = succ_end(Latch);
>>>>> -       SBI != SBE; ++SBI) {
>>>>> -    for (BasicBlock::iterator BBI = (*SBI)->begin();
>>>>> -         PHINode *PN = dyn_cast<PHINode>(BBI); ++BBI) {
>>>>> -
>>>>> +  for (BasicBlock *Succ : successors(Latch)) {
>>>>> +    for (Instruction &BBI : *Succ) {
>>>>> +      PHINode *PN = dyn_cast<PHINode>(&BBI);
>>>>> +      // Exit when we passed all PHI nodes.
>>>>> +      if (!PN)
>>>>> +        break;
>>>>>     // Add a new PHI node to the prolog end block and add the
>>>>>     // appropriate incoming values.
>>>>> -      PHINode *NewPN = PHINode::Create(PN->getType(), 2, PN->getName()+".unr",
>>>>> -                                       PrologEnd->getTerminator());
>>>>> +      PHINode *NewPN = PHINode::Create(PN->getType(), 2, PN->getName() + ".unr",
>>>>> +                                       PrologExit->getFirstNonPHI());
>>>>>     // Adding a value to the new PHI node from the original loop preheader.
>>>>>     // This is the value that skips all the prolog code.
>>>>>     if (L->contains(PN)) {
>>>>> -        NewPN->addIncoming(PN->getIncomingValueForBlock(NewPH), OrigPH);
>>>>> +        NewPN->addIncoming(PN->getIncomingValueForBlock(NewPreHeader),
>>>>> +                           PreHeader);
>>>>>     } else {
>>>>> -        NewPN->addIncoming(UndefValue::get(PN->getType()), OrigPH);
>>>>> +        NewPN->addIncoming(UndefValue::get(PN->getType()), PreHeader);
>>>>>     }
>>>>> 
>>>>>     Value *V = PN->getIncomingValueForBlock(Latch);
>>>>> @@ -97,22 +99,22 @@ static void ConnectProlog(Loop *L, Value
>>>>>     }
>>>>>     // Adding a value to the new PHI node from the last prolog block
>>>>>     // that was created.
>>>>> -      NewPN->addIncoming(V, LastPrologBB);
>>>>> +      NewPN->addIncoming(V, PrologLatch);
>>>>> 
>>>>>     // Update the existing PHI node operand with the value from the
>>>>>     // new PHI node.  How this is done depends on if the existing
>>>>>     // PHI node is in the original loop block, or the exit block.
>>>>>     if (L->contains(PN)) {
>>>>> -        PN->setIncomingValue(PN->getBasicBlockIndex(NewPH), NewPN);
>>>>> +        PN->setIncomingValue(PN->getBasicBlockIndex(NewPreHeader), NewPN);
>>>>>     } else {
>>>>> -        PN->addIncoming(NewPN, PrologEnd);
>>>>> +        PN->addIncoming(NewPN, PrologExit);
>>>>>     }
>>>>>   }
>>>>> }
>>>>> 
>>>>> // Create a branch around the original loop, which is taken if there are no
>>>>> // iterations remaining to be executed after running the prologue.
>>>>> -  Instruction *InsertPt = PrologEnd->getTerminator();
>>>>> +  Instruction *InsertPt = PrologExit->getTerminator();
>>>>> IRBuilder<> B(InsertPt);
>>>>> 
>>>>> assert(Count != 0 && "nonsensical Count!");
>>>>> @@ -126,25 +128,152 @@ static void ConnectProlog(Loop *L, Value
>>>>> BasicBlock *Exit = L->getUniqueExitBlock();
>>>>> assert(Exit && "Loop must have a single exit block only");
>>>>> // Split the exit to maintain loop canonicalization guarantees
>>>>> -  SmallVector<BasicBlock*, 4> Preds(pred_begin(Exit), pred_end(Exit));
>>>>> +  SmallVector<BasicBlock*, 4> Preds(predecessors(Exit));
>>>>> SplitBlockPredecessors(Exit, Preds, ".unr-lcssa", DT, LI,
>>>>>                        PreserveLCSSA);
>>>>> // Add the branch to the exit block (around the unrolled loop)
>>>>> -  B.CreateCondBr(BrLoopExit, Exit, NewPH);
>>>>> +  B.CreateCondBr(BrLoopExit, Exit, NewPreHeader);
>>>>> +  InsertPt->eraseFromParent();
>>>>> +}
>>>>> +
>>>>> +/// Connect the unrolling epilog code to the original loop.
>>>>> +/// The unrolling epilog code contains code to execute the
>>>>> +/// 'extra' iterations if the run-time trip count modulo the
>>>>> +/// unroll count is non-zero.
>>>>> +///
>>>>> +/// This function performs the following:
>>>>> +/// - Update PHI nodes at the unrolling loop exit and epilog loop exit
>>>>> +/// - Create PHI nodes at the unrolling loop exit to combine
>>>>> +///   values that exit the unrolling loop code and jump around it.
>>>>> +/// - Update PHI operands in the epilog loop by the new PHI nodes
>>>>> +/// - Branch around the epilog loop if extra iters (ModVal) is zero.
>>>>> +///
>>>>> +static void ConnectEpilog(Loop *L, Value *ModVal, BasicBlock *NewExit,
>>>>> +                          BasicBlock *Exit, BasicBlock *PreHeader,
>>>>> +                          BasicBlock *EpilogPreHeader, BasicBlock *NewPreHeader,
>>>>> +                          ValueToValueMapTy &VMap, DominatorTree *DT,
>>>>> +                          LoopInfo *LI, bool PreserveLCSSA)  {
>>>>> +  BasicBlock *Latch = L->getLoopLatch();
>>>>> +  assert(Latch && "Loop must have a latch");
>>>>> +  BasicBlock *EpilogLatch = cast<BasicBlock>(VMap[Latch]);
>>>>> +
>>>>> +  // Loop structure should be the following:
>>>>> +  //
>>>>> +  // PreHeader
>>>>> +  // NewPreHeader
>>>>> +  //   Header
>>>>> +  //   ...
>>>>> +  //   Latch
>>>>> +  // NewExit (PN)
>>>>> +  // EpilogPreHeader
>>>>> +  //   EpilogHeader
>>>>> +  //   ...
>>>>> +  //   EpilogLatch
>>>>> +  // Exit (EpilogPN)
>>>>> +
>>>>> +  // Update PHI nodes at NewExit and Exit.
>>>>> +  for (Instruction &BBI : *NewExit) {
>>>>> +    PHINode *PN = dyn_cast<PHINode>(&BBI);
>>>>> +    // Exit when we passed all PHI nodes.
>>>>> +    if (!PN)
>>>>> +      break;
>>>>> +    // PN should be used in another PHI located in Exit block as
>>>>> +    // Exit was split by SplitBlockPredecessors into Exit and NewExit
>>>>> +    // Basicaly it should look like:
>>>>> +    // NewExit:
>>>>> +    //   PN = PHI [I, Latch]
>>>>> +    // ...
>>>>> +    // Exit:
>>>>> +    //   EpilogPN = PHI [PN, EpilogPreHeader]
>>>>> +    //
>>>>> +    // There is EpilogPreHeader incoming block instead of NewExit as
>>>>> +    // NewExit was spilt 1 more time to get EpilogPreHeader.
>>>>> +    assert(PN->hasOneUse() && "The phi should have 1 use");
>>>>> +    PHINode *EpilogPN = cast<PHINode> (PN->use_begin()->getUser());
>>>>> +    assert(EpilogPN->getParent() == Exit && "EpilogPN should be in Exit block");
>>>>> +
>>>>> +    // Add incoming PreHeader from branch around the Loop
>>>>> +    PN->addIncoming(UndefValue::get(PN->getType()), PreHeader);
>>>>> +
>>>>> +    Value *V = PN->getIncomingValueForBlock(Latch);
>>>>> +    Instruction *I = dyn_cast<Instruction>(V);
>>>>> +    if (I && L->contains(I))
>>>>> +      // If value comes from an instruction in the loop add VMap value.
>>>>> +      V = VMap[I];
>>>>> +    // For the instruction out of the loop, constant or undefined value
>>>>> +    // insert value itself.
>>>>> +    EpilogPN->addIncoming(V, EpilogLatch);
>>>>> +
>>>>> +    assert(EpilogPN->getBasicBlockIndex(EpilogPreHeader) >= 0 &&
>>>>> +          "EpilogPN should have EpilogPreHeader incoming block");
>>>>> +    // Change EpilogPreHeader incoming block to NewExit.
>>>>> +    EpilogPN->setIncomingBlock(EpilogPN->getBasicBlockIndex(EpilogPreHeader),
>>>>> +                               NewExit);
>>>>> +    // Now PHIs should look like:
>>>>> +    // NewExit:
>>>>> +    //   PN = PHI [I, Latch], [undef, PreHeader]
>>>>> +    // ...
>>>>> +    // Exit:
>>>>> +    //   EpilogPN = PHI [PN, NewExit], [VMap[I], EpilogLatch]
>>>>> +  }
>>>>> +
>>>>> +  // Create PHI nodes at NewExit (from the unrolling loop Latch and PreHeader).
>>>>> +  // Update corresponding PHI nodes in epilog loop.
>>>>> +  for (BasicBlock *Succ : successors(Latch)) {
>>>>> +    // Skip this as we already updated phis in exit blocks.
>>>>> +    if (!L->contains(Succ))
>>>>> +      continue;
>>>>> +    for (Instruction &BBI : *Succ) {
>>>>> +      PHINode *PN = dyn_cast<PHINode>(&BBI);
>>>>> +      // Exit when we passed all PHI nodes.
>>>>> +      if (!PN)
>>>>> +        break;
>>>>> +      // Add new PHI nodes to the loop exit block and update epilog
>>>>> +      // PHIs with the new PHI values.
>>>>> +      PHINode *NewPN = PHINode::Create(PN->getType(), 2, PN->getName() + ".unr",
>>>>> +                                       NewExit->getFirstNonPHI());
>>>>> +      // Adding a value to the new PHI node from the unrolling loop preheader.
>>>>> +      NewPN->addIncoming(PN->getIncomingValueForBlock(NewPreHeader), PreHeader);
>>>>> +      // Adding a value to the new PHI node from the unrolling loop latch.
>>>>> +      NewPN->addIncoming(PN->getIncomingValueForBlock(Latch), Latch);
>>>>> +
>>>>> +      // Update the existing PHI node operand with the value from the new PHI
>>>>> +      // node.  Corresponding instruction in epilog loop should be PHI.
>>>>> +      PHINode *VPN = cast<PHINode>(VMap[&BBI]);
>>>>> +      VPN->setIncomingValue(VPN->getBasicBlockIndex(EpilogPreHeader), NewPN);
>>>>> +    }
>>>>> +  }
>>>>> +
>>>>> +  Instruction *InsertPt = NewExit->getTerminator();
>>>>> +  IRBuilder<> B(InsertPt);
>>>>> +  Value *BrLoopExit = B.CreateIsNotNull(ModVal);
>>>>> +  assert(Exit && "Loop must have a single exit block only");
>>>>> +  // Split the exit to maintain loop canonicalization guarantees
>>>>> +  SmallVector<BasicBlock*, 4> Preds(predecessors(Exit));
>>>>> +  SplitBlockPredecessors(Exit, Preds, ".epilog-lcssa", DT, LI,
>>>>> +                         PreserveLCSSA);
>>>>> +  // Add the branch to the exit block (around the unrolling loop)
>>>>> +  B.CreateCondBr(BrLoopExit, EpilogPreHeader, Exit);
>>>>> InsertPt->eraseFromParent();
>>>>> }
>>>>> 
>>>>> /// Create a clone of the blocks in a loop and connect them together.
>>>>> -/// If UnrollProlog is true, loop structure will not be cloned, otherwise a new
>>>>> -/// loop will be created including all cloned blocks, and the iterator of it
>>>>> -/// switches to count NewIter down to 0.
>>>>> +/// If CreateRemainderLoop is false, loop structure will not be cloned,
>>>>> +/// otherwise a new loop will be created including all cloned blocks, and the
>>>>> +/// iterator of it switches to count NewIter down to 0.
>>>>> +/// The cloned blocks should be inserted between InsertTop and InsertBot.
>>>>> +/// If loop structure is cloned InsertTop should be new preheader, InsertBot
>>>>> +/// new loop exit.
>>>>> ///
>>>>> -static void CloneLoopBlocks(Loop *L, Value *NewIter, const bool UnrollProlog,
>>>>> +static void CloneLoopBlocks(Loop *L, Value *NewIter,
>>>>> +                            const bool CreateRemainderLoop,
>>>>> +                            const bool UseEpilogRemainder,
>>>>>                           BasicBlock *InsertTop, BasicBlock *InsertBot,
>>>>> +                            BasicBlock *Preheader,
>>>>>                           std::vector<BasicBlock *> &NewBlocks,
>>>>>                           LoopBlocksDFS &LoopBlocks, ValueToValueMapTy &VMap,
>>>>>                           LoopInfo *LI) {
>>>>> -  BasicBlock *Preheader = L->getLoopPreheader();
>>>>> +  StringRef suffix = UseEpilogRemainder ? "epil" : "prol";
>>>>> BasicBlock *Header = L->getHeader();
>>>>> BasicBlock *Latch = L->getLoopLatch();
>>>>> Function *F = Header->getParent();
>>>>> @@ -152,7 +281,7 @@ static void CloneLoopBlocks(Loop *L, Val
>>>>> LoopBlocksDFS::RPOIterator BlockEnd = LoopBlocks.endRPO();
>>>>> Loop *NewLoop = nullptr;
>>>>> Loop *ParentLoop = L->getParentLoop();
>>>>> -  if (!UnrollProlog) {
>>>>> +  if (CreateRemainderLoop) {
>>>>>   NewLoop = new Loop();
>>>>>   if (ParentLoop)
>>>>>     ParentLoop->addChildLoop(NewLoop);
>>>>> @@ -163,7 +292,7 @@ static void CloneLoopBlocks(Loop *L, Val
>>>>> // For each block in the original loop, create a new copy,
>>>>> // and update the value map with the newly created values.
>>>>> for (LoopBlocksDFS::RPOIterator BB = BlockBegin; BB != BlockEnd; ++BB) {
>>>>> -    BasicBlock *NewBB = CloneBasicBlock(*BB, VMap, ".prol", F);
>>>>> +    BasicBlock *NewBB = CloneBasicBlock(*BB, VMap, "." + suffix, F);
>>>>>   NewBlocks.push_back(NewBB);
>>>>> 
>>>>>   if (NewLoop)
>>>>> @@ -179,16 +308,17 @@ static void CloneLoopBlocks(Loop *L, Val
>>>>>   }
>>>>> 
>>>>>   if (Latch == *BB) {
>>>>> -      // For the last block, if UnrollProlog is true, create a direct jump to
>>>>> -      // InsertBot. If not, create a loop back to cloned head.
>>>>> +      // For the last block, if CreateRemainderLoop is false, create a direct
>>>>> +      // jump to InsertBot. If not, create a loop back to cloned head.
>>>>>     VMap.erase((*BB)->getTerminator());
>>>>>     BasicBlock *FirstLoopBB = cast<BasicBlock>(VMap[Header]);
>>>>>     BranchInst *LatchBR = cast<BranchInst>(NewBB->getTerminator());
>>>>>     IRBuilder<> Builder(LatchBR);
>>>>> -      if (UnrollProlog) {
>>>>> +      if (!CreateRemainderLoop) {
>>>>>       Builder.CreateBr(InsertBot);
>>>>>     } else {
>>>>> -        PHINode *NewIdx = PHINode::Create(NewIter->getType(), 2, "prol.iter",
>>>>> +        PHINode *NewIdx = PHINode::Create(NewIter->getType(), 2,
>>>>> +                                          suffix + ".iter",
>>>>>                                         FirstLoopBB->getFirstNonPHI());
>>>>>       Value *IdxSub =
>>>>>           Builder.CreateSub(NewIdx, ConstantInt::get(NewIdx->getType(), 1),
>>>>> @@ -207,9 +337,15 @@ static void CloneLoopBlocks(Loop *L, Val
>>>>> // cloned loop.
>>>>> for (BasicBlock::iterator I = Header->begin(); isa<PHINode>(I); ++I) {
>>>>>   PHINode *NewPHI = cast<PHINode>(VMap[&*I]);
>>>>> -    if (UnrollProlog) {
>>>>> -      VMap[&*I] = NewPHI->getIncomingValueForBlock(Preheader);
>>>>> -      cast<BasicBlock>(VMap[Header])->getInstList().erase(NewPHI);
>>>>> +    if (!CreateRemainderLoop) {
>>>>> +      if (UseEpilogRemainder) {
>>>>> +        unsigned idx = NewPHI->getBasicBlockIndex(Preheader);
>>>>> +        NewPHI->setIncomingBlock(idx, InsertTop);
>>>>> +        NewPHI->removeIncomingValue(Latch, false);
>>>>> +      } else {
>>>>> +        VMap[&*I] = NewPHI->getIncomingValueForBlock(Preheader);
>>>>> +        cast<BasicBlock>(VMap[Header])->getInstList().erase(NewPHI);
>>>>> +      }
>>>>>   } else {
>>>>>     unsigned idx = NewPHI->getBasicBlockIndex(Preheader);
>>>>>     NewPHI->setIncomingBlock(idx, InsertTop);
>>>>> @@ -254,7 +390,7 @@ static void CloneLoopBlocks(Loop *L, Val
>>>>> }
>>>>> }
>>>>> 
>>>>> -/// Insert code in the prolog code when unrolling a loop with a
>>>>> +/// Insert code in the prolog/epilog code when unrolling a loop with a
>>>>> /// run-time trip-count.
>>>>> ///
>>>>> /// This method assumes that the loop unroll factor is total number
>>>>> @@ -266,6 +402,7 @@ static void CloneLoopBlocks(Loop *L, Val
>>>>> /// instruction in SimplifyCFG.cpp.  Then, the backend decides how code for
>>>>> /// the switch instruction is generated.
>>>>> ///
>>>>> +/// ***Prolog case***
>>>>> ///        extraiters = tripcount % loopfactor
>>>>> ///        if (extraiters == 0) jump Loop:
>>>>> ///        else jump Prol
>>>>> @@ -277,17 +414,35 @@ static void CloneLoopBlocks(Loop *L, Val
>>>>> /// ...
>>>>> /// End:
>>>>> ///
>>>>> -bool llvm::UnrollRuntimeLoopProlog(Loop *L, unsigned Count,
>>>>> -                                   bool AllowExpensiveTripCount, LoopInfo *LI,
>>>>> -                                   ScalarEvolution *SE, DominatorTree *DT,
>>>>> -                                   bool PreserveLCSSA) {
>>>>> -  // For now, only unroll loops that contain a single exit.
>>>>> +/// ***Epilog case***
>>>>> +///        extraiters = tripcount % loopfactor
>>>>> +///        if (extraiters == tripcount) jump LoopExit:
>>>>> +///        unroll_iters = tripcount - extraiters
>>>>> +/// Loop:  LoopBody; (executes unroll_iter times);
>>>>> +///        unroll_iter -= 1
>>>>> +///        if (unroll_iter != 0) jump Loop:
>>>>> +/// LoopExit:
>>>>> +///        if (extraiters == 0) jump EpilExit:
>>>>> +/// Epil:  LoopBody; (executes extraiters times)
>>>>> +///        extraiters -= 1                 // Omitted if unroll factor is 2.
>>>>> +///        if (extraiters != 0) jump Epil: // Omitted if unroll factor is 2.
>>>>> +/// EpilExit:
>>>>> +
>>>>> +bool llvm::UnrollRuntimeLoopRemainder(Loop *L, unsigned Count,
>>>>> +                                      bool AllowExpensiveTripCount,
>>>>> +                                      bool UseEpilogRemainder,
>>>>> +                                      LoopInfo *LI, ScalarEvolution *SE,
>>>>> +                                      DominatorTree *DT, bool PreserveLCSSA) {
>>>>> +  // for now, only unroll loops that contain a single exit
>>>>> if (!L->getExitingBlock())
>>>>>   return false;
>>>>> 
>>>>> // Make sure the loop is in canonical form, and there is a single
>>>>> // exit block only.
>>>>> -  if (!L->isLoopSimplifyForm() || !L->getUniqueExitBlock())
>>>>> +  if (!L->isLoopSimplifyForm())
>>>>> +    return false;
>>>>> +  BasicBlock *Exit = L->getUniqueExitBlock(); // successor out of loop
>>>>> +  if (!Exit)
>>>>>   return false;
>>>>> 
>>>>> // Use Scalar Evolution to compute the trip count. This allows more loops to
>>>>> @@ -311,8 +466,8 @@ bool llvm::UnrollRuntimeLoopProlog(Loop
>>>>>   return false;
>>>>> 
>>>>> BasicBlock *Header = L->getHeader();
>>>>> -  BasicBlock *PH = L->getLoopPreheader();
>>>>> -  BranchInst *PreHeaderBR = cast<BranchInst>(PH->getTerminator());
>>>>> +  BasicBlock *PreHeader = L->getLoopPreheader();
>>>>> +  BranchInst *PreHeaderBR = cast<BranchInst>(PreHeader->getTerminator());
>>>>> const DataLayout &DL = Header->getModule()->getDataLayout();
>>>>> SCEVExpander Expander(*SE, DL, "loop-unroll");
>>>>> if (!AllowExpensiveTripCount &&
>>>>> @@ -330,26 +485,75 @@ bool llvm::UnrollRuntimeLoopProlog(Loop
>>>>>   SE->forgetLoop(ParentLoop);
>>>>> 
>>>>> BasicBlock *Latch = L->getLoopLatch();
>>>>> -  // It helps to split the original preheader twice, one for the end of the
>>>>> -  // prolog code and one for a new loop preheader.
>>>>> -  BasicBlock *PEnd = SplitEdge(PH, Header, DT, LI);
>>>>> -  BasicBlock *NewPH = SplitBlock(PEnd, PEnd->getTerminator(), DT, LI);
>>>>> -  PreHeaderBR = cast<BranchInst>(PH->getTerminator());
>>>>> 
>>>>> +  // Loop structure is the following:
>>>>> +  //
>>>>> +  // PreHeader
>>>>> +  //   Header
>>>>> +  //   ...
>>>>> +  //   Latch
>>>>> +  // Exit
>>>>> +
>>>>> +  BasicBlock *NewPreHeader;
>>>>> +  BasicBlock *NewExit = nullptr;
>>>>> +  BasicBlock *PrologExit = nullptr;
>>>>> +  BasicBlock *EpilogPreHeader = nullptr;
>>>>> +  BasicBlock *PrologPreHeader = nullptr;
>>>>> +
>>>>> +  if (UseEpilogRemainder) {
>>>>> +    // If epilog remainder
>>>>> +    // Split PreHeader to insert a branch around loop for unrolling.
>>>>> +    NewPreHeader = SplitBlock(PreHeader, PreHeader->getTerminator(), DT, LI);
>>>>> +    NewPreHeader->setName(PreHeader->getName() + ".new");
>>>>> +    // Split Exit to create phi nodes from branch above.
>>>>> +    SmallVector<BasicBlock*, 4> Preds(predecessors(Exit));
>>>>> +    NewExit = SplitBlockPredecessors(Exit, Preds, ".unr-lcssa",
>>>>> +                                     DT, LI, PreserveLCSSA);
>>>>> +    // Split NewExit to insert epilog remainder loop.
>>>>> +    EpilogPreHeader = SplitBlock(NewExit, NewExit->getTerminator(), DT, LI);
>>>>> +    EpilogPreHeader->setName(Header->getName() + ".epil.preheader");
>>>>> +  } else {
>>>>> +    // If prolog remainder
>>>>> +    // Split the original preheader twice to insert prolog remainder loop
>>>>> +    PrologPreHeader = SplitEdge(PreHeader, Header, DT, LI);
>>>>> +    PrologPreHeader->setName(Header->getName() + ".prol.preheader");
>>>>> +    PrologExit = SplitBlock(PrologPreHeader, PrologPreHeader->getTerminator(),
>>>>> +                            DT, LI);
>>>>> +    PrologExit->setName(Header->getName() + ".prol.loopexit");
>>>>> +    // Split PrologExit to get NewPreHeader.
>>>>> +    NewPreHeader = SplitBlock(PrologExit, PrologExit->getTerminator(), DT, LI);
>>>>> +    NewPreHeader->setName(PreHeader->getName() + ".new");
>>>>> +  }
>>>>> +  // Loop structure should be the following:
>>>>> +  //  Epilog             Prolog
>>>>> +  //
>>>>> +  // PreHeader         PreHeader
>>>>> +  // *NewPreHeader     *PrologPreHeader
>>>>> +  //   Header          *PrologExit
>>>>> +  //   ...             *NewPreHeader
>>>>> +  //   Latch             Header
>>>>> +  // *NewExit            ...
>>>>> +  // *EpilogPreHeader    Latch
>>>>> +  // Exit              Exit
>>>>> +
>>>>> +  // Calculate conditions for branch around loop for unrolling
>>>>> +  // in epilog case and around prolog remainder loop in prolog case.
>>>>> // Compute the number of extra iterations required, which is:
>>>>> -  //  extra iterations = run-time trip count % (loop unroll factor + 1)
>>>>> +  //  extra iterations = run-time trip count % loop unroll factor
>>>>> +  PreHeaderBR = cast<BranchInst>(PreHeader->getTerminator());
>>>>> Value *TripCount = Expander.expandCodeFor(TripCountSC, TripCountSC->getType(),
>>>>>                                           PreHeaderBR);
>>>>> Value *BECount = Expander.expandCodeFor(BECountSC, BECountSC->getType(),
>>>>>                                         PreHeaderBR);
>>>>> -
>>>>> IRBuilder<> B(PreHeaderBR);
>>>>> Value *ModVal;
>>>>> // Calculate ModVal = (BECount + 1) % Count.
>>>>> // Note that TripCount is BECount + 1.
>>>>> if (isPowerOf2_32(Count)) {
>>>>> +    // When Count is power of 2 we don't BECount for epilog case, however we'll
>>>>> +    // need it for a branch around unrolling loop for prolog case.
>>>>>   ModVal = B.CreateAnd(TripCount, Count - 1, "xtraiter");
>>>>> -    //  1. There are no iterations to be run in the prologue loop.
>>>>> +    //  1. There are no iterations to be run in the prolog/epilog loop.
>>>>>   // OR
>>>>>   //  2. The addition computing TripCount overflowed.
>>>>>   //
>>>>> @@ -371,18 +575,18 @@ bool llvm::UnrollRuntimeLoopProlog(Loop
>>>>>                         ConstantInt::get(BECount->getType(), Count),
>>>>>                         "xtraiter");
>>>>> }
>>>>> -  Value *BranchVal = B.CreateIsNotNull(ModVal, "lcmp.mod");
>>>>> -
>>>>> -  // Branch to either the extra iterations or the cloned/unrolled loop.
>>>>> -  // We will fix up the true branch label when adding loop body copies.
>>>>> -  B.CreateCondBr(BranchVal, PEnd, PEnd);
>>>>> -  assert(PreHeaderBR->isUnconditional() &&
>>>>> -         PreHeaderBR->getSuccessor(0) == PEnd &&
>>>>> -         "CFG edges in Preheader are not correct");
>>>>> +  Value *CmpOperand =
>>>>> +      UseEpilogRemainder ? TripCount :
>>>>> +                           ConstantInt::get(TripCount->getType(), 0);
>>>>> +  Value *BranchVal = B.CreateICmpNE(ModVal, CmpOperand, "lcmp.mod");
>>>>> +  BasicBlock *FirstLoop = UseEpilogRemainder ? NewPreHeader : PrologPreHeader;
>>>>> +  BasicBlock *SecondLoop = UseEpilogRemainder ? NewExit : PrologExit;
>>>>> +  // Branch to either remainder (extra iterations) loop or unrolling loop.
>>>>> +  B.CreateCondBr(BranchVal, FirstLoop, SecondLoop);
>>>>> PreHeaderBR->eraseFromParent();
>>>>> Function *F = Header->getParent();
>>>>> // Get an ordered list of blocks in the loop to help with the ordering of the
>>>>> -  // cloned blocks in the prolog code.
>>>>> +  // cloned blocks in the prolog/epilog code
>>>>> LoopBlocksDFS LoopBlocks(L);
>>>>> LoopBlocks.perform(LI);
>>>>> 
>>>>> @@ -394,17 +598,38 @@ bool llvm::UnrollRuntimeLoopProlog(Loop
>>>>> std::vector<BasicBlock *> NewBlocks;
>>>>> ValueToValueMapTy VMap;
>>>>> 
>>>>> -  bool UnrollPrologue = Count == 2;
>>>>> +  // For unroll factor 2 remainder loop will have 1 iterations.
>>>>> +  // Do not create 1 iteration loop.
>>>>> +  bool CreateRemainderLoop = (Count != 2);
>>>>> 
>>>>> // Clone all the basic blocks in the loop. If Count is 2, we don't clone
>>>>> // the loop, otherwise we create a cloned loop to execute the extra
>>>>> // iterations. This function adds the appropriate CFG connections.
>>>>> -  CloneLoopBlocks(L, ModVal, UnrollPrologue, PH, PEnd, NewBlocks, LoopBlocks,
>>>>> -                  VMap, LI);
>>>>> +  BasicBlock *InsertBot = UseEpilogRemainder ? Exit : PrologExit;
>>>>> +  BasicBlock *InsertTop = UseEpilogRemainder ? EpilogPreHeader : PrologPreHeader;
>>>>> +  CloneLoopBlocks(L, ModVal, CreateRemainderLoop, UseEpilogRemainder, InsertTop,
>>>>> +                  InsertBot, NewPreHeader, NewBlocks, LoopBlocks, VMap, LI);
>>>>> +
>>>>> +  // Insert the cloned blocks into the function.
>>>>> +  F->getBasicBlockList().splice(InsertBot->getIterator(),
>>>>> +                                F->getBasicBlockList(),
>>>>> +                                NewBlocks[0]->getIterator(),
>>>>> +                                F->end());
>>>>> 
>>>>> -  // Insert the cloned blocks into the function just before the original loop.
>>>>> -  F->getBasicBlockList().splice(PEnd->getIterator(), F->getBasicBlockList(),
>>>>> -                                NewBlocks[0]->getIterator(), F->end());
>>>>> +  // Loop structure should be the following:
>>>>> +  //  Epilog             Prolog
>>>>> +  //
>>>>> +  // PreHeader         PreHeader
>>>>> +  // NewPreHeader      PrologPreHeader
>>>>> +  //   Header            PrologHeader
>>>>> +  //   ...               ...
>>>>> +  //   Latch             PrologLatch
>>>>> +  // NewExit           PrologExit
>>>>> +  // EpilogPreHeader   NewPreHeader
>>>>> +  //   EpilogHeader      Header
>>>>> +  //   ...               ...
>>>>> +  //   EpilogLatch       Latch
>>>>> +  // Exit              Exit
>>>>> 
>>>>> // Rewrite the cloned instruction operands to use the values created when the
>>>>> // clone is created.
>>>>> @@ -415,11 +640,38 @@ bool llvm::UnrollRuntimeLoopProlog(Loop
>>>>>   }
>>>>> }
>>>>> 
>>>>> -  // Connect the prolog code to the original loop and update the
>>>>> -  // PHI functions.
>>>>> -  BasicBlock *LastLoopBB = cast<BasicBlock>(VMap[Latch]);
>>>>> -  ConnectProlog(L, BECount, Count, LastLoopBB, PEnd, PH, NewPH, VMap, DT, LI,
>>>>> -                PreserveLCSSA);
>>>>> +  if (UseEpilogRemainder) {
>>>>> +    // Connect the epilog code to the original loop and update the
>>>>> +    // PHI functions.
>>>>> +    ConnectEpilog(L, ModVal, NewExit, Exit, PreHeader,
>>>>> +                  EpilogPreHeader, NewPreHeader, VMap, DT, LI,
>>>>> +                  PreserveLCSSA);
>>>>> +
>>>>> +    // Update counter in loop for unrolling.
>>>>> +    // I should be multiply of Count.
>>>>> +    IRBuilder<> B2(NewPreHeader->getTerminator());
>>>>> +    Value *TestVal = B2.CreateSub(TripCount, ModVal, "unroll_iter");
>>>>> +    BranchInst *LatchBR = cast<BranchInst>(Latch->getTerminator());
>>>>> +    B2.SetInsertPoint(LatchBR);
>>>>> +    PHINode *NewIdx = PHINode::Create(TestVal->getType(), 2, "niter",
>>>>> +                                      Header->getFirstNonPHI());
>>>>> +    Value *IdxSub =
>>>>> +        B2.CreateSub(NewIdx, ConstantInt::get(NewIdx->getType(), 1),
>>>>> +                     NewIdx->getName() + ".nsub");
>>>>> +    Value *IdxCmp;
>>>>> +    if (LatchBR->getSuccessor(0) == Header)
>>>>> +      IdxCmp = B2.CreateIsNotNull(IdxSub, NewIdx->getName() + ".ncmp");
>>>>> +    else
>>>>> +      IdxCmp = B2.CreateIsNull(IdxSub, NewIdx->getName() + ".ncmp");
>>>>> +    NewIdx->addIncoming(TestVal, NewPreHeader);
>>>>> +    NewIdx->addIncoming(IdxSub, Latch);
>>>>> +    LatchBR->setCondition(IdxCmp);
>>>>> +  } else {
>>>>> +    // Connect the prolog code to the original loop and update the
>>>>> +    // PHI functions.
>>>>> +    ConnectProlog(L, BECount, Count, PrologExit, PreHeader, NewPreHeader,
>>>>> +                  VMap, DT, LI, PreserveLCSSA);
>>>>> +  }
>>>>> NumRuntimeUnrolled++;
>>>>> return true;
>>>>> }
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/AArch64/runtime-loop.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/AArch64/runtime-loop.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/AArch64/runtime-loop.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/AArch64/runtime-loop.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -1,13 +1,21 @@
>>>>> -; RUN: opt < %s -S -loop-unroll -mtriple aarch64 -mcpu=cortex-a57 | FileCheck %s
>>>>> +; RUN: opt < %s -S -loop-unroll -mtriple aarch64 -mcpu=cortex-a57 | FileCheck %s -check-prefix=EPILOG
>>>>> +; RUN: opt < %s -S -loop-unroll -mtriple aarch64 -mcpu=cortex-a57 -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
>>>>> 
>>>>> ; Tests for unrolling loops with run-time trip counts
>>>>> 
>>>>> -; CHECK:  %xtraiter = and i32 %n
>>>>> -; CHECK:  %lcmp.mod = icmp ne i32 %xtraiter, 0
>>>>> -; CHECK:  br i1 %lcmp.mod, label %for.body.prol, label %for.body.preheader.split
>>>>> +; EPILOG:  %xtraiter = and i32 %n
>>>>> +; EPILOG:  %lcmp.mod = icmp ne i32 %xtraiter, %n
>>>>> +; EPILOG:  br i1 %lcmp.mod, label %for.body.preheader.new, label %for.end.loopexit.unr-lcssa
>>>>> 
>>>>> -; CHECK:  for.body.prol:
>>>>> -; CHECK:  for.body:
>>>>> +; PROLOG:  %xtraiter = and i32 %n
>>>>> +; PROLOG:  %lcmp.mod = icmp ne i32 %xtraiter, 0
>>>>> +; PROLOG:  br i1 %lcmp.mod, label %for.body.prol.preheader, label %for.body.prol.loopexit
>>>>> +
>>>>> +; EPILOG:  for.body:
>>>>> +; EPILOG:  for.body.epil:
>>>>> +
>>>>> +; PROLOG:  for.body.prol:
>>>>> +; PROLOG:  for.body:
>>>>> 
>>>>> define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly {
>>>>> entry:
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/PowerPC/a2-unrolling.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/PowerPC/a2-unrolling.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/PowerPC/a2-unrolling.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/PowerPC/a2-unrolling.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -1,4 +1,5 @@
>>>>> -; RUN: opt < %s -S -mtriple=powerpc64-unknown-linux-gnu -mcpu=a2 -loop-unroll | FileCheck %s
>>>>> +; RUN: opt < %s -S -mtriple=powerpc64-unknown-linux-gnu -mcpu=a2 -loop-unroll | FileCheck %s -check-prefix=EPILOG
>>>>> +; RUN: opt < %s -S -mtriple=powerpc64-unknown-linux-gnu -mcpu=a2 -loop-unroll -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
>>>>> define void @unroll_opt_for_size() nounwind optsize {
>>>>> entry:
>>>>> br label %loop
>>>>> @@ -13,11 +14,17 @@ exit:
>>>>> ret void
>>>>> }
>>>>> 
>>>>> -; CHECK-LABEL: @unroll_opt_for_size
>>>>> -; CHECK:      add
>>>>> -; CHECK-NEXT: add
>>>>> -; CHECK-NEXT: add
>>>>> -; CHECK: icmp
>>>>> +; EPILOG-LABEL: @unroll_opt_for_size
>>>>> +; EPILOG:      add
>>>>> +; EPILOG-NEXT: add
>>>>> +; EPILOG-NEXT: add
>>>>> +; EPILOG: icmp
>>>>> +
>>>>> +; PROLOG-LABEL: @unroll_opt_for_size
>>>>> +; PROLOG:      add
>>>>> +; PROLOG-NEXT: add
>>>>> +; PROLOG-NEXT: add
>>>>> +; PROLOG: icmp
>>>>> 
>>>>> define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly {
>>>>> entry:
>>>>> @@ -40,8 +47,13 @@ for.end:
>>>>> ret i32 %sum.0.lcssa
>>>>> }
>>>>> 
>>>>> -; CHECK-LABEL: @test
>>>>> -; CHECK: for.body.prol{{.*}}:
>>>>> -; CHECK: for.body:
>>>>> -; CHECK: br i1 %exitcond.7, label %for.end.loopexit{{.*}}, label %for.body
>>>>> +; EPILOG-LABEL: @test
>>>>> +; EPILOG: for.body:
>>>>> +; EPILOG: br i1 %niter.ncmp.7, label %for.end.loopexit{{.*}}, label %for.body
>>>>> +; EPILOG: for.body.epil{{.*}}:
>>>>> +
>>>>> +; PROLOG-LABEL: @test
>>>>> +; PROLOG: for.body.prol{{.*}}:
>>>>> +; PROLOG: for.body:
>>>>> +; PROLOG: br i1 %exitcond.7, label %for.end.loopexit{{.*}}, label %for.body
>>>>> 
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/X86/mmx.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/X86/mmx.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/X86/mmx.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/X86/mmx.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -14,9 +14,9 @@ for.body:
>>>>> 
>>>>> exit:                                             ; preds = %for.body
>>>>> %ret = phi x86_mmx [ undef, %for.body ]
>>>>> -  ; CHECK: %[[ret_unr:.*]] = phi x86_mmx [ undef,
>>>>> -  ; CHECK: %[[ret_ph:.*]]  = phi x86_mmx [ undef,
>>>>> -  ; CHECK: %[[ret:.*]] = phi x86_mmx [ %[[ret_unr]], {{.*}} ], [ %[[ret_ph]]
>>>>> +  ; CHECK: %[[ret_ph:.*]] = phi x86_mmx [ undef, %entry
>>>>> +  ; CHECK: %[[ret_ph1:.*]]  = phi x86_mmx [ undef,
>>>>> +  ; CHECK: %[[ret:.*]] = phi x86_mmx [ %[[ret_ph]], {{.*}} ], [ %[[ret_ph1]],
>>>>> ; CHECK: ret x86_mmx %[[ret]]
>>>>> ret x86_mmx %ret
>>>>> }
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -34,7 +34,7 @@ define i32 @test2(i64* %loc, i64 %conv7)
>>>>> ; CHECK: udiv
>>>>> ; CHECK: udiv
>>>>> ; CHECK-NOT: udiv
>>>>> -; CHECK-LABEL: for.body.prol
>>>>> +; CHECK-LABEL: for.body
>>>>> entry:
>>>>> %rem0 = load i64, i64* %loc, align 8
>>>>> %ExpensiveComputation = udiv i64 %rem0, 42 ; <<< Extra computations are added to the trip-count expression
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/runtime-loop.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/runtime-loop.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/runtime-loop.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/runtime-loop.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -1,18 +1,30 @@
>>>>> -; RUN: opt < %s -S -loop-unroll -unroll-runtime=true | FileCheck %s
>>>>> +; RUN: opt < %s -S -loop-unroll -unroll-runtime=true | FileCheck %s -check-prefix=EPILOG
>>>>> +; RUN: opt < %s -S -loop-unroll -unroll-runtime=true -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
>>>>> 
>>>>> target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
>>>>> 
>>>>> ; Tests for unrolling loops with run-time trip counts
>>>>> 
>>>>> -; CHECK: %xtraiter = and i32 %n
>>>>> -; CHECK:  %lcmp.mod = icmp ne i32 %xtraiter, 0
>>>>> -; CHECK:  br i1 %lcmp.mod, label %for.body.prol, label %for.body.preheader.split
>>>>> -
>>>>> -; CHECK: for.body.prol:
>>>>> -; CHECK: %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %for.body.prol ], [ 0, %for.body.preheader ]
>>>>> -; CHECK:  %prol.iter.sub = sub i32 %prol.iter, 1
>>>>> -; CHECK:  %prol.iter.cmp = icmp ne i32 %prol.iter.sub, 0
>>>>> -; CHECK:  br i1 %prol.iter.cmp, label %for.body.prol, label %for.body.preheader.split, !llvm.loop !0
>>>>> +; EPILOG: %xtraiter = and i32 %n
>>>>> +; EPILOG:  %lcmp.mod = icmp ne i32 %xtraiter, %n
>>>>> +; EPILOG:  br i1 %lcmp.mod, label %for.body.preheader.new, label %for.end.loopexit.unr-lcssa
>>>>> +
>>>>> +; PROLOG: %xtraiter = and i32 %n
>>>>> +; PROLOG:  %lcmp.mod = icmp ne i32 %xtraiter, 0
>>>>> +; PROLOG:  br i1 %lcmp.mod, label %for.body.prol.preheader, label %for.body.prol.loopexit
>>>>> +
>>>>> +; EPILOG: for.body.epil:
>>>>> +; EPILOG: %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %for.body.epil ],  [ %indvars.iv.unr, %for.body.epil.preheader ]
>>>>> +; EPILOG:  %epil.iter.sub = sub i32 %epil.iter, 1
>>>>> +; EPILOG:  %epil.iter.cmp = icmp ne i32 %epil.iter.sub, 0
>>>>> +; EPILOG:  br i1 %epil.iter.cmp, label %for.body.epil, label %for.end.loopexit.epilog-lcssa, !llvm.loop !0
>>>>> +
>>>>> +; PROLOG: for.body.prol:
>>>>> +; PROLOG: %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %for.body.prol ], [ 0, %for.body.prol.preheader ]
>>>>> +; PROLOG:  %prol.iter.sub = sub i32 %prol.iter, 1
>>>>> +; PROLOG:  %prol.iter.cmp = icmp ne i32 %prol.iter.sub, 0
>>>>> +; PROLOG:  br i1 %prol.iter.cmp, label %for.body.prol, label %for.body.prol.loopexit, !llvm.loop !0
>>>>> +
>>>>> 
>>>>> define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly {
>>>>> entry:
>>>>> @@ -39,8 +51,11 @@ for.end:
>>>>> ; Still try to completely unroll loops with compile-time trip counts
>>>>> ; even if the -unroll-runtime is specified
>>>>> 
>>>>> -; CHECK: for.body:
>>>>> -; CHECK-NOT: for.body.prol:
>>>>> +; EPILOG: for.body:
>>>>> +; EPILOG-NOT: for.body.epil:
>>>>> +
>>>>> +; PROLOG: for.body:
>>>>> +; PROLOG-NOT: for.body.prol:
>>>>> 
>>>>> define i32 @test1(i32* nocapture %a) nounwind uwtable readonly {
>>>>> entry:
>>>>> @@ -64,7 +79,8 @@ for.end:
>>>>> ; This is test 2007-05-09-UnknownTripCount.ll which can be unrolled now
>>>>> ; if the -unroll-runtime option is turned on
>>>>> 
>>>>> -; CHECK: bb72.2:
>>>>> +; EPILOG: bb72.2:
>>>>> +; PROLOG: bb72.2:
>>>>> 
>>>>> define void @foo(i32 %trips) {
>>>>> entry:
>>>>> @@ -86,8 +102,11 @@ cond_true138:
>>>>> 
>>>>> ; Test run-time unrolling for a loop that counts down by -2.
>>>>> 
>>>>> -; CHECK: for.body.prol:
>>>>> -; CHECK: br i1 %prol.iter.cmp, label %for.body.prol, label %for.body.preheader.split
>>>>> +; EPILOG: for.body.epil:
>>>>> +; EPILOG: br i1 %epil.iter.cmp, label %for.body.epil, label %for.cond.for.end_crit_edge.epilog-lcssa
>>>>> +
>>>>> +; PROLOG: for.body.prol:
>>>>> +; PROLOG: br i1 %prol.iter.cmp, label %for.body.prol, label %for.body.prol.loopexit
>>>>> 
>>>>> define zeroext i16 @down(i16* nocapture %p, i32 %len) nounwind uwtable readonly {
>>>>> entry:
>>>>> @@ -116,8 +135,11 @@ for.end:
>>>>> }
>>>>> 
>>>>> ; Test run-time unrolling disable metadata.
>>>>> -; CHECK: for.body:
>>>>> -; CHECK-NOT: for.body.prol:
>>>>> +; EPILOG: for.body:
>>>>> +; EPILOG-NOT: for.body.epil:
>>>>> +
>>>>> +; PROLOG: for.body:
>>>>> +; PROLOG-NOT: for.body.prol:
>>>>> 
>>>>> define zeroext i16 @test2(i16* nocapture %p, i32 %len) nounwind uwtable readonly {
>>>>> entry:
>>>>> @@ -148,6 +170,8 @@ for.end:
>>>>> !0 = distinct !{!0, !1}
>>>>> !1 = !{!"llvm.loop.unroll.runtime.disable"}
>>>>> 
>>>>> -; CHECK: !0 = distinct !{!0, !1}
>>>>> -; CHECK: !1 = !{!"llvm.loop.unroll.disable"}
>>>>> +; EPILOG: !0 = distinct !{!0, !1}
>>>>> +; EPILOG: !1 = !{!"llvm.loop.unroll.disable"}
>>>>> 
>>>>> +; PROLOG: !0 = distinct !{!0, !1}
>>>>> +; PROLOG: !1 = !{!"llvm.loop.unroll.disable"}
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/runtime-loop1.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/runtime-loop1.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/runtime-loop1.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/runtime-loop1.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -1,19 +1,35 @@
>>>>> -; RUN: opt < %s -S -loop-unroll -unroll-runtime -unroll-count=2 | FileCheck %s
>>>>> +; RUN: opt < %s -S -loop-unroll -unroll-runtime -unroll-count=2 | FileCheck %s -check-prefix=EPILOG
>>>>> +; RUN: opt < %s -S -loop-unroll -unroll-runtime -unroll-count=2 -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
>>>>> 
>>>>> ; This tests that setting the unroll count works
>>>>> 
>>>>> -; CHECK: for.body.preheader:
>>>>> -; CHECK:   br {{.*}} label %for.body.prol, label %for.body.preheader.split, !dbg [[PH_LOC:![0-9]+]]
>>>>> -; CHECK: for.body.prol:
>>>>> -; CHECK:   br label %for.body.preheader.split, !dbg [[BODY_LOC:![0-9]+]]
>>>>> -; CHECK: for.body.preheader.split:
>>>>> -; CHECK:   br {{.*}} label %for.end.loopexit, label %for.body.preheader.split.split, !dbg [[PH_LOC]]
>>>>> -; CHECK: for.body:
>>>>> -; CHECK:   br i1 %exitcond.1, label %for.end.loopexit.unr-lcssa, label %for.body, !dbg [[BODY_LOC]]
>>>>> -; CHECK-NOT: br i1 %exitcond.4, label %for.end.loopexit{{.*}}, label %for.body
>>>>> 
>>>>> -; CHECK-DAG: [[PH_LOC]] = !DILocation(line: 101, column: 1, scope: !{{.*}})
>>>>> -; CHECK-DAG: [[BODY_LOC]] = !DILocation(line: 102, column: 1, scope: !{{.*}})
>>>>> +; EPILOG: for.body.preheader:
>>>>> +; EPILOG:   br i1 %lcmp.mod, label %for.body.preheader.new, label %for.end.loopexit.unr-lcssa, !dbg [[PH_LOC:![0-9]+]]
>>>>> +; EPILOG: for.body:
>>>>> +; EPILOG:   br i1 %niter.ncmp.1, label %for.end.loopexit.unr-lcssa.loopexit, label %for.body, !dbg [[BODY_LOC:![0-9]+]]
>>>>> +; EPILOG-NOT: br i1 %niter.ncmp.2, label %for.end.loopexit{{.*}}, label %for.body
>>>>> +; EPILOG: for.body.epil.preheader:
>>>>> +; EPILOG:   br label %for.body.epil, !dbg [[EXIT_LOC:![0-9]+]]
>>>>> +; EPILOG: for.body.epil:
>>>>> +; EPILOG:   br label %for.end.loopexit.epilog-lcssa, !dbg [[BODY_LOC:![0-9]+]]
>>>>> +
>>>>> +; EPILOG-DAG: [[PH_LOC]] = !DILocation(line: 101, column: 1, scope: !{{.*}})
>>>>> +; EPILOG-DAG: [[BODY_LOC]] = !DILocation(line: 102, column: 1, scope: !{{.*}})
>>>>> +; EPILOG-DAG: [[EXIT_LOC]] = !DILocation(line: 103, column: 1, scope: !{{.*}})
>>>>> +
>>>>> +; PROLOG: for.body.preheader:
>>>>> +; PROLOG:   br {{.*}} label %for.body.prol.preheader, label %for.body.prol.loopexit, !dbg [[PH_LOC:![0-9]+]]
>>>>> +; PROLOG: for.body.prol:
>>>>> +; PROLOG:   br label %for.body.prol.loopexit, !dbg [[BODY_LOC:![0-9]+]]
>>>>> +; PROLOG: for.body.prol.loopexit:
>>>>> +; PROLOG:   br {{.*}} label %for.end.loopexit, label %for.body.preheader.new, !dbg [[PH_LOC]]
>>>>> +; PROLOG: for.body:
>>>>> +; PROLOG:   br i1 %exitcond.1, label %for.end.loopexit.unr-lcssa, label %for.body, !dbg [[BODY_LOC]]
>>>>> +; PROLOG-NOT: br i1 %exitcond.4, label %for.end.loopexit{{.*}}, label %for.body
>>>>> +
>>>>> +; PROLOG-DAG: [[PH_LOC]] = !DILocation(line: 101, column: 1, scope: !{{.*}})
>>>>> +; PROLOG-DAG: [[BODY_LOC]] = !DILocation(line: 102, column: 1, scope: !{{.*}})
>>>>> 
>>>>> define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly !dbg !6 {
>>>>> entry:
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/runtime-loop2.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/runtime-loop2.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/runtime-loop2.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/runtime-loop2.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -1,12 +1,18 @@
>>>>> -; RUN: opt < %s -S -loop-unroll -unroll-threshold=25 -unroll-runtime -unroll-count=8 | FileCheck %s
>>>>> +; RUN: opt < %s -S -loop-unroll -unroll-threshold=25 -unroll-runtime -unroll-count=8 | FileCheck %s  -check-prefix=EPILOG
>>>>> +; RUN: opt < %s -S -loop-unroll -unroll-threshold=25 -unroll-runtime -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
>>>>> 
>>>>> ; Choose a smaller, power-of-two, unroll count if the loop is too large.
>>>>> ; This test makes sure we're not unrolling 'odd' counts
>>>>> 
>>>>> -; CHECK: for.body.prol:
>>>>> -; CHECK: for.body:
>>>>> -; CHECK: br i1 %exitcond.3, label %for.end.loopexit{{.*}}, label %for.body
>>>>> -; CHECK-NOT: br i1 %exitcond.4, label %for.end.loopexit{{.*}}, label %for.body
>>>>> +; EPILOG: for.body:
>>>>> +; EPILOG: br i1 %niter.ncmp.3, label %for.end.loopexit.unr-lcssa.loopexit{{.*}}, label %for.body
>>>>> +; EPILOG-NOT: br i1 %niter.ncmp.4, label %for.end.loopexit.unr-lcssa.loopexit{{.*}}, label %for.body
>>>>> +; EPILOG: for.body.epil:
>>>>> +
>>>>> +; PROLOG: for.body.prol:
>>>>> +; PROLOG: for.body:
>>>>> +; PROLOG: br i1 %exitcond.3, label %for.end.loopexit{{.*}}, label %for.body
>>>>> +; PROLOG-NOT: br i1 %exitcond.4, label %for.end.loopexit{{.*}}, label %for.body
>>>>> 
>>>>> define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly {
>>>>> entry:
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/runtime-loop4.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/runtime-loop4.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/runtime-loop4.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/runtime-loop4.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -1,13 +1,21 @@
>>>>> -; RUN: opt < %s -S -O2 -unroll-runtime=true | FileCheck %s
>>>>> +; RUN: opt < %s -S -O2 -unroll-runtime=true | FileCheck %s -check-prefix=EPILOG
>>>>> +; RUN: opt < %s -S -O2 -unroll-runtime=true -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
>>>>> 
>>>>> ; Check runtime unrolling prologue can be promoted by LICM pass.
>>>>> 
>>>>> -; CHECK: entry:
>>>>> -; CHECK: %xtraiter
>>>>> -; CHECK: %lcmp.mod
>>>>> -; CHECK: loop1:
>>>>> -; CHECK: br i1 %lcmp.mod
>>>>> -; CHECK: loop2.prol:
>>>>> +; EPILOG: entry:
>>>>> +; EPILOG: %xtraiter
>>>>> +; EPILOG: %lcmp.mod
>>>>> +; EPILOG: loop1:
>>>>> +; EPILOG: br i1 %lcmp.mod
>>>>> +; EPILOG: loop2.epil:
>>>>> +
>>>>> +; PROLOG: entry:
>>>>> +; PROLOG: %xtraiter
>>>>> +; PROLOG: %lcmp.mod
>>>>> +; PROLOG: loop1:
>>>>> +; PROLOG: br i1 %lcmp.mod
>>>>> +; PROLOG: loop2.prol:
>>>>> 
>>>>> define void @unroll(i32 %iter, i32* %addr1, i32* %addr2) nounwind {
>>>>> entry:
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/runtime-loop5.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/runtime-loop5.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/runtime-loop5.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/runtime-loop5.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -11,9 +11,6 @@ entry:
>>>>> %cmp1 = icmp eq i3 %n, 0
>>>>> br i1 %cmp1, label %for.end, label %for.body
>>>>> 
>>>>> -; UNROLL-16-NOT: for.body.prol:
>>>>> -; UNROLL-4: for.body.prol:
>>>>> -
>>>>> for.body:                                         ; preds = %for.body, %entry
>>>>> ; UNROLL-16-LABEL: for.body:
>>>>> ; UNROLL-4-LABEL: for.body:
>>>>> @@ -39,6 +36,10 @@ for.body:
>>>>> 
>>>>> ; UNROLL-16-LABEL: for.end
>>>>> ; UNROLL-4-LABEL: for.end
>>>>> +
>>>>> +; UNROLL-16-NOT: for.body.epil:
>>>>> +; UNROLL-4: for.body.epil:
>>>>> +
>>>>> for.end:                                          ; preds = %for.body, %entry
>>>>> %sum.0.lcssa = phi i3 [ 0, %entry ], [ %add, %for.body ]
>>>>> ret i3 %sum.0.lcssa
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/tripcount-overflow.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/tripcount-overflow.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/tripcount-overflow.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/tripcount-overflow.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -13,13 +13,13 @@ target datalayout = "e-m:o-i64:64-f80:12
>>>>> ; CHECK: entry:
>>>>> ; CHECK-NEXT: %0 = add i32 %N, 1
>>>>> ; CHECK-NEXT: %xtraiter = and i32 %0, 1
>>>>> -; CHECK-NEXT: %lcmp.mod = icmp ne i32 %xtraiter, 0
>>>>> -; CHECK-NEXT: br i1 %lcmp.mod, label %while.body.prol, label %entry.split
>>>>> +; CHECK-NEXT: %lcmp.mod = icmp ne i32 %xtraiter, %0
>>>>> +; CHECK-NEXT: br i1 %lcmp.mod, label %entry.new, label %while.end.unr-lcssa
>>>>> 
>>>>> -; CHECK: while.body.prol:
>>>>> -; CHECK: br label %entry.split
>>>>> +; CHECK: while.body.epil:
>>>>> +; CHECK: br label %while.end.epilog-lcssa
>>>>> 
>>>>> -; CHECK: entry.split:
>>>>> +; CHECK: while.end.epilog-lcssa:
>>>>> 
>>>>> ; Function Attrs: nounwind readnone ssp uwtable
>>>>> define i32 @foo(i32 %N) {
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/unroll-cleanup.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/unroll-cleanup.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/unroll-cleanup.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/unroll-cleanup.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -4,14 +4,14 @@
>>>>> ; RUN: opt < %s -O2 -S | FileCheck %s
>>>>> 
>>>>> ; After loop unroll:
>>>>> -;       %dec18 = add nsw i32 %dec18.in, -1
>>>>> +;       %niter.nsub = add nsw i32 %niter, -1
>>>>> ;       ...
>>>>> -;       %dec18.1 = add nsw i32 %dec18, -1
>>>>> +;       %niter.nsub.1 = add nsw i32 %niter.nsub, -1
>>>>> ; should be merged to:
>>>>> -;       %dec18.1 = add nsw i32 %dec18.in, -2
>>>>> +;       %dec18.1 = add nsw i32 %niter, -2
>>>>> ;
>>>>> ; CHECK-LABEL: @_Z3fn1v(
>>>>> -; CHECK: %dec18.1 = add nsw i32 %dec18.in, -2
>>>>> +; CHECK: %niter.nsub.1 = add i32 %niter, -2
>>>>> 
>>>>> ; ModuleID = '<stdin>'
>>>>> target triple = "x86_64-unknown-linux-gnu"
>>>>> 
>>>>> Modified: llvm/trunk/test/Transforms/LoopUnroll/unroll-pragmas.ll
>>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnroll/unroll-pragmas.ll?rev=265388&r1=265387&r2=265388&view=diff
>>>>> ==============================================================================
>>>>> --- llvm/trunk/test/Transforms/LoopUnroll/unroll-pragmas.ll (original)
>>>>> +++ llvm/trunk/test/Transforms/LoopUnroll/unroll-pragmas.ll Tue Apr  5 07:19:35 2016
>>>>> @@ -171,10 +171,6 @@ for.end:
>>>>> ; should be duplicated (original and 4x unrolled).
>>>>> ;
>>>>> ; CHECK-LABEL: @runtime_loop_with_count4(
>>>>> -; CHECK: for.body.prol:
>>>>> -; CHECK: store
>>>>> -; CHECK-NOT: store
>>>>> -; CHECK: br i1
>>>>> ; CHECK: for.body
>>>>> ; CHECK: store
>>>>> ; CHECK: store
>>>>> @@ -182,6 +178,10 @@ for.end:
>>>>> ; CHECK: store
>>>>> ; CHECK-NOT: store
>>>>> ; CHECK: br i1
>>>>> +; CHECK: for.body.epil:
>>>>> +; CHECK: store
>>>>> +; CHECK-NOT: store
>>>>> +; CHECK: br i1
>>>>> define void @runtime_loop_with_count4(i32* nocapture %a, i32 %b) {
>>>>> entry:
>>>>> %cmp3 = icmp sgt i32 %b, 0
>>>>> @@ -287,10 +287,6 @@ for.end:
>>>>> ; (original and 8x).
>>>>> ;
>>>>> ; CHECK-LABEL: @runtime_loop_with_enable(
>>>>> -; CHECK: for.body.prol:
>>>>> -; CHECK: store
>>>>> -; CHECK-NOT: store
>>>>> -; CHECK: br i1
>>>>> ; CHECK: for.body:
>>>>> ; CHECK: store i32
>>>>> ; CHECK: store i32
>>>>> @@ -302,6 +298,10 @@ for.end:
>>>>> ; CHECK: store i32
>>>>> ; CHECK-NOT: store i32
>>>>> ; CHECK: br i1
>>>>> +; CHECK: for.body.epil:
>>>>> +; CHECK: store
>>>>> +; CHECK-NOT: store
>>>>> +; CHECK: br i1
>>>>> define void @runtime_loop_with_enable(i32* nocapture %a, i32 %b) {
>>>>> entry:
>>>>> %cmp3 = icmp sgt i32 %b, 0
>>>>> @@ -328,16 +328,16 @@ for.end:
>>>>> ; should be duplicated (original and 3x unrolled).
>>>>> ;
>>>>> ; CHECK-LABEL: @runtime_loop_with_count3(
>>>>> -; CHECK: for.body.prol:
>>>>> -; CHECK: store
>>>>> -; CHECK-NOT: store
>>>>> -; CHECK: br i1
>>>>> ; CHECK: for.body
>>>>> ; CHECK: store
>>>>> ; CHECK: store
>>>>> ; CHECK: store
>>>>> ; CHECK-NOT: store
>>>>> ; CHECK: br i1
>>>>> +; CHECK: for.body.epil:
>>>>> +; CHECK: store
>>>>> +; CHECK-NOT: store
>>>>> +; CHECK: br i1
>>>>> define void @runtime_loop_with_count3(i32* nocapture %a, i32 %b) {
>>>>> entry:
>>>>> %cmp3 = icmp sgt i32 %b, 0
>>>>> 
>>>>> 
>>>>> _______________________________________________
>>>>> llvm-commits mailing list
>>>>> llvm-commits at lists.llvm.org
>>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
>>>> 
>>>> _______________________________________________
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>>>> llvm-commits at lists.llvm.org
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