[llvm] 7fe41ac - Revert "[LV] Unconditionally branch from middle to scalar preheader if the scalar loop must execute"
Adrian Kuegel via llvm-commits
llvm-commits at lists.llvm.org
Sun Feb 7 23:45:43 PST 2021
This showed up in the google internal testing on PPC, a segmentation fault
was triggered, and then I looked for whether there are also failures in
open source on one of the existing buildbots. I didn't check whether the
buildbot is one of those that are notifying or not and whether it has the
exact same problem I saw internally, sorry for that. But based on the
testing I did (I ran a binary search over LLVM changes), I can say with
certainty that your change introduced this segmentation fault on PPC. And
after the revert, it was again working fine. I will ask people more
knowledgeable than me how I can create a reproducer for you. I was the one
responsible for integrating the LLVM changes into google, and it was a bad
week and I could barely keep up with the rate of breakages and/or things
needing adjustments.
On Fri, Feb 5, 2021 at 6:05 PM Philip Reames <listmail at philipreames.com>
wrote:
> Adrian,
>
> I'm going to need you to provide a bit more information here. The test
> failure in stage1 was fixed at the time you reverted this patch. The
> remaining failure in the bot is very unclear. What is a execution_time
> failure? From the log output, the "failing" run finished in 0.5 seconds,
> whereas the previous "succeeding" run finished in 11 seconds. Without
> further context, I'd say that's no failure.
>
> I'll also note that I did not receive email from this bot. I received
> notice from the various other bots and fixed the ARM test issue, but
> unless I missed it in with the others, this bot is not notifying.
>
> In general, I'm a fan of fast reverts, but I have to admit, this one
> appears borderline at the moment.
>
> Philip
>
> On 2/5/21 3:53 AM, Adrian Kuegel via llvm-commits wrote:
> > Author: Adrian Kuegel
> > Date: 2021-02-05T12:51:03+01:00
> > New Revision: 7fe41ac3dff2d44c3d2c31b28554fbe4a86eaa6c
> >
> > URL:
> https://github.com/llvm/llvm-project/commit/7fe41ac3dff2d44c3d2c31b28554fbe4a86eaa6c
> > DIFF:
> https://github.com/llvm/llvm-project/commit/7fe41ac3dff2d44c3d2c31b28554fbe4a86eaa6c.diff
> >
> > LOG: Revert "[LV] Unconditionally branch from middle to scalar preheader
> if the scalar loop must execute"
> >
> > This reverts commit 3e5ce49e5371ce4feadbf97dd5c2b652d9db3d1d.
> >
> > Tests started failing on PPC, for example:
> > http://lab.llvm.org:8011/#/builders/105/builds/5569
> >
> > Added:
> >
> >
> > Modified:
> > llvm/lib/Transforms/Utils/LoopVersioning.cpp
> > llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
> > llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll
> > llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll
> > llvm/test/Transforms/LoopVectorize/loop-form.ll
> >
> > Removed:
> >
> >
> >
> >
> ################################################################################
> > diff --git a/llvm/lib/Transforms/Utils/LoopVersioning.cpp
> b/llvm/lib/Transforms/Utils/LoopVersioning.cpp
> > index 8a89158788cf..de4fb446fdf2 100644
> > --- a/llvm/lib/Transforms/Utils/LoopVersioning.cpp
> > +++ b/llvm/lib/Transforms/Utils/LoopVersioning.cpp
> > @@ -44,11 +44,11 @@ LoopVersioning::LoopVersioning(const LoopAccessInfo
> &LAI,
> > AliasChecks(Checks.begin(), Checks.end()),
> > Preds(LAI.getPSE().getUnionPredicate()), LAI(LAI), LI(LI),
> DT(DT),
> > SE(SE) {
> > + assert(L->getUniqueExitBlock() && "No single exit block");
> > }
> >
> > void LoopVersioning::versionLoop(
> > const SmallVectorImpl<Instruction *> &DefsUsedOutside) {
> > - assert(VersionedLoop->getUniqueExitBlock() && "No single exit block");
> > assert(VersionedLoop->isLoopSimplifyForm() &&
> > "Loop is not in loop-simplify form");
> >
> >
> > diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
> b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
> > index 3277842edbfe..6bce0caeb36f 100644
> > --- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
> > +++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
> > @@ -852,7 +852,7 @@ class InnerLoopVectorizer {
> > /// Middle Block between the vector and the scalar.
> > BasicBlock *LoopMiddleBlock;
> >
> > - /// The unique ExitBlock of the scalar loop if one exists. Note that
> > + /// The (unique) ExitBlock of the scalar loop. Note that
> > /// there can be multiple exiting edges reaching this block.
> > BasicBlock *LoopExitBlock;
> >
> > @@ -3147,13 +3147,9 @@ void
> InnerLoopVectorizer::emitMinimumIterationCountCheck(Loop *L,
> > DT->getNode(Bypass)->getIDom()) &&
> > "TC check is expected to dominate Bypass");
> >
> > - // Update dominator for Bypass & LoopExit (if needed).
> > + // Update dominator for Bypass & LoopExit.
> > DT->changeImmediateDominator(Bypass, TCCheckBlock);
> > - if (!Cost->requiresScalarEpilogue())
> > - // If there is an epilogue which must run, there's no edge from the
> > - // middle block to exit blocks and thus no need to update the
> immediate
> > - // dominator of the exit blocks.
> > - DT->changeImmediateDominator(LoopExitBlock, TCCheckBlock);
> > + DT->changeImmediateDominator(LoopExitBlock, TCCheckBlock);
> >
> > ReplaceInstWithInst(
> > TCCheckBlock->getTerminator(),
> > @@ -3192,11 +3188,7 @@ void InnerLoopVectorizer::emitSCEVChecks(Loop *L,
> BasicBlock *Bypass) {
> > // Update dominator only if this is first RT check.
> > if (LoopBypassBlocks.empty()) {
> > DT->changeImmediateDominator(Bypass, SCEVCheckBlock);
> > - if (!Cost->requiresScalarEpilogue())
> > - // If there is an epilogue which must run, there's no edge from
> the
> > - // middle block to exit blocks and thus no need to update the
> immediate
> > - // dominator of the exit blocks.
> > - DT->changeImmediateDominator(LoopExitBlock, SCEVCheckBlock);
> > + DT->changeImmediateDominator(LoopExitBlock, SCEVCheckBlock);
> > }
> >
> > ReplaceInstWithInst(
> > @@ -3252,11 +3244,7 @@ void
> InnerLoopVectorizer::emitMemRuntimeChecks(Loop *L, BasicBlock *Bypass) {
> > // Update dominator only if this is first RT check.
> > if (LoopBypassBlocks.empty()) {
> > DT->changeImmediateDominator(Bypass, MemCheckBlock);
> > - if (!Cost->requiresScalarEpilogue())
> > - // If there is an epilogue which must run, there's no edge from
> the
> > - // middle block to exit blocks and thus no need to update the
> immediate
> > - // dominator of the exit blocks.
> > - DT->changeImmediateDominator(LoopExitBlock, MemCheckBlock);
> > + DT->changeImmediateDominator(LoopExitBlock, MemCheckBlock);
> > }
> >
> > Instruction *FirstCheckInst;
> > @@ -3381,10 +3369,9 @@ Value *InnerLoopVectorizer::emitTransformedIndex(
> > Loop *InnerLoopVectorizer::createVectorLoopSkeleton(StringRef Prefix) {
> > LoopScalarBody = OrigLoop->getHeader();
> > LoopVectorPreHeader = OrigLoop->getLoopPreheader();
> > + LoopExitBlock = OrigLoop->getUniqueExitBlock();
> > + assert(LoopExitBlock && "Must have an exit block");
> > assert(LoopVectorPreHeader && "Invalid loop structure");
> > - LoopExitBlock = OrigLoop->getUniqueExitBlock(); // may be nullptr
> > - assert((LoopExitBlock || Cost->requiresScalarEpilogue()) &&
> > - "multiple exit loop without required epilogue?");
> >
> > LoopMiddleBlock =
> > SplitBlock(LoopVectorPreHeader,
> LoopVectorPreHeader->getTerminator(), DT,
> > @@ -3393,20 +3380,12 @@ Loop
> *InnerLoopVectorizer::createVectorLoopSkeleton(StringRef Prefix) {
> > SplitBlock(LoopMiddleBlock, LoopMiddleBlock->getTerminator(),
> DT, LI,
> > nullptr, Twine(Prefix) + "scalar.ph");
> >
> > + // Set up branch from middle block to the exit and scalar preheader
> blocks.
> > + // completeLoopSkeleton will update the condition to use an iteration
> check,
> > + // if required to decide whether to execute the remainder.
> > + BranchInst *BrInst =
> > + BranchInst::Create(LoopExitBlock, LoopScalarPreHeader,
> Builder.getTrue());
> > auto *ScalarLatchTerm = OrigLoop->getLoopLatch()->getTerminator();
> > -
> > - // Set up the middle block terminator. Two cases:
> > - // 1) If we know that we must execute the scalar epilogue, emit an
> > - // unconditional branch.
> > - // 2) Otherwise, we must have a single unique exit block (due to how
> we
> > - // implement the multiple exit case). In this case, set up a
> conditonal
> > - // branch from the middle block to the loop scalar preheader, and
> the
> > - // exit block. completeLoopSkeleton will update the condition to
> use an
> > - // iteration check, if required to decide whether to execute the
> remainder.
> > - BranchInst *BrInst = Cost->requiresScalarEpilogue() ?
> > - BranchInst::Create(LoopScalarPreHeader) :
> > - BranchInst::Create(LoopExitBlock, LoopScalarPreHeader,
> > - Builder.getTrue());
> > BrInst->setDebugLoc(ScalarLatchTerm->getDebugLoc());
> > ReplaceInstWithInst(LoopMiddleBlock->getTerminator(), BrInst);
> >
> > @@ -3418,11 +3397,7 @@ Loop
> *InnerLoopVectorizer::createVectorLoopSkeleton(StringRef Prefix) {
> > nullptr, nullptr, Twine(Prefix) + "vector.body");
> >
> > // Update dominator for loop exit.
> > - if (!Cost->requiresScalarEpilogue())
> > - // If there is an epilogue which must run, there's no edge from the
> > - // middle block to exit blocks and thus no need to update the
> immediate
> > - // dominator of the exit blocks.
> > - DT->changeImmediateDominator(LoopExitBlock, LoopMiddleBlock);
> > + DT->changeImmediateDominator(LoopExitBlock, LoopMiddleBlock);
> >
> > // Create and register the new vector loop.
> > Loop *Lp = LI->AllocateLoop();
> > @@ -3519,14 +3494,10 @@ BasicBlock
> *InnerLoopVectorizer::completeLoopSkeleton(Loop *L,
> > auto *ScalarLatchTerm = OrigLoop->getLoopLatch()->getTerminator();
> >
> > // Add a check in the middle block to see if we have completed
> > - // all of the iterations in the first vector loop. Three cases:
> > - // 1) If we require a scalar epilogue, there is no conditional branch
> as
> > - // we unconditionally branch to the scalar preheader. Do nothing.
> > - // 2) If (N - N%VF) == N, then we *don't* need to run the remainder.
> > - // Thus if tail is to be folded, we know we don't need to run the
> > - // remainder and we can use the previous value for the condition
> (true).
> > - // 3) Otherwise, construct a runtime check.
> > - if (!Cost->requiresScalarEpilogue() && !Cost->foldTailByMasking()) {
> > + // all of the iterations in the first vector loop.
> > + // If (N - N%VF) == N, then we *don't* need to run the remainder.
> > + // If tail is to be folded, we know we don't need to run the
> remainder.
> > + if (!Cost->foldTailByMasking()) {
> > Instruction *CmpN = CmpInst::Create(Instruction::ICmp,
> CmpInst::ICMP_EQ,
> > Count, VectorTripCount,
> "cmp.n",
> >
> LoopMiddleBlock->getTerminator());
> > @@ -3590,17 +3561,17 @@ BasicBlock
> *InnerLoopVectorizer::createVectorizedLoopSkeleton() {
> > | [ ]_| <-- vector loop.
> > | |
> > | v
> > - \ -[ ] <--- middle-block.
> > - \/ |
> > - /\ v
> > - | ->[ ] <--- new preheader.
> > + | -[ ] <--- middle-block.
> > + | / |
> > + | / v
> > + -|- >[ ] <--- new preheader.
> > | |
> > - (opt) v <-- edge from middle to exit iff epilogue is not
> required.
> > + | v
> > | [ ] \
> > - | [ ]_| <-- old scalar loop to handle remainder (scalar
> epilogue).
> > + | [ ]_| <-- old scalar loop to handle remainder.
> > \ |
> > \ v
> > - >[ ] <-- exit block(s).
> > + >[ ] <-- exit block.
> > ...
> > */
> >
> > @@ -4021,18 +3992,13 @@ void InnerLoopVectorizer::fixVectorizedLoop() {
> > // Forget the original basic block.
> > PSE.getSE()->forgetLoop(OrigLoop);
> >
> > - // If we inserted an edge from the middle block to the unique exit
> block,
> > - // update uses outside the loop (phis) to account for the newly
> inserted
> > - // edge.
> > - if (!Cost->requiresScalarEpilogue()) {
> > - // Fix-up external users of the induction variables.
> > - for (auto &Entry : Legal->getInductionVars())
> > - fixupIVUsers(Entry.first, Entry.second,
> > -
> getOrCreateVectorTripCount(LI->getLoopFor(LoopVectorBody)),
> > - IVEndValues[Entry.first], LoopMiddleBlock);
> > + // Fix-up external users of the induction variables.
> > + for (auto &Entry : Legal->getInductionVars())
> > + fixupIVUsers(Entry.first, Entry.second,
> > +
> getOrCreateVectorTripCount(LI->getLoopFor(LoopVectorBody)),
> > + IVEndValues[Entry.first], LoopMiddleBlock);
> >
> > - fixLCSSAPHIs();
> > - }
> > + fixLCSSAPHIs();
> > for (Instruction *PI : PredicatedInstructions)
> > sinkScalarOperands(&*PI);
> >
> > @@ -4250,13 +4216,12 @@ void
> InnerLoopVectorizer::fixFirstOrderRecurrence(PHINode *Phi) {
> > // recurrence in the exit block, and then add an edge for the middle
> block.
> > // Note that LCSSA does not imply single entry when the original
> scalar loop
> > // had multiple exiting edges (as we always run the last iteration
> in the
> > - // scalar epilogue); in that case, there is no edge from middle to
> exit and
> > - // and thus no phis which needed updated.
> > - if (!Cost->requiresScalarEpilogue())
> > - for (PHINode &LCSSAPhi : LoopExitBlock->phis())
> > - if (any_of(LCSSAPhi.incoming_values(),
> > - [Phi](Value *V) { return V == Phi; }))
> > - LCSSAPhi.addIncoming(ExtractForPhiUsedOutsideLoop,
> LoopMiddleBlock);
> > + // scalar epilogue); in that case, the exiting path through middle
> will be
> > + // dynamically dead and the value picked for the phi doesn't matter.
> > + for (PHINode &LCSSAPhi : LoopExitBlock->phis())
> > + if (any_of(LCSSAPhi.incoming_values(),
> > + [Phi](Value *V) { return V == Phi; }))
> > + LCSSAPhi.addIncoming(ExtractForPhiUsedOutsideLoop,
> LoopMiddleBlock);
> > }
> >
> > void InnerLoopVectorizer::fixReduction(PHINode *Phi) {
> > @@ -4421,11 +4386,10 @@ void InnerLoopVectorizer::fixReduction(PHINode
> *Phi) {
> > // We know that the loop is in LCSSA form. We need to update the PHI
> nodes
> > // in the exit blocks. See comment on analogous loop in
> > // fixFirstOrderRecurrence for a more complete explaination of the
> logic.
> > - if (!Cost->requiresScalarEpilogue())
> > - for (PHINode &LCSSAPhi : LoopExitBlock->phis())
> > - if (any_of(LCSSAPhi.incoming_values(),
> > - [LoopExitInst](Value *V) { return V == LoopExitInst;
> }))
> > - LCSSAPhi.addIncoming(ReducedPartRdx, LoopMiddleBlock);
> > + for (PHINode &LCSSAPhi : LoopExitBlock->phis())
> > + if (any_of(LCSSAPhi.incoming_values(),
> > + [LoopExitInst](Value *V) { return V == LoopExitInst; }))
> > + LCSSAPhi.addIncoming(ReducedPartRdx, LoopMiddleBlock);
> >
> > // Fix the scalar loop reduction variable with the incoming
> reduction sum
> > // from the vector body and from the backedge value.
> > @@ -8074,11 +8038,7 @@ BasicBlock
> *EpilogueVectorizerMainLoop::emitMinimumIterationCountCheck(
> >
> > // Update dominator for Bypass & LoopExit.
> > DT->changeImmediateDominator(Bypass, TCCheckBlock);
> > - if (!Cost->requiresScalarEpilogue())
> > - // For loops with multiple exits, there's no edge from the middle
> block
> > - // to exit blocks (as the epilogue must run) and thus no need to
> update
> > - // the immediate dominator of the exit blocks.
> > - DT->changeImmediateDominator(LoopExitBlock, TCCheckBlock);
> > + DT->changeImmediateDominator(LoopExitBlock, TCCheckBlock);
> >
> > LoopBypassBlocks.push_back(TCCheckBlock);
> >
> > @@ -8142,12 +8102,7 @@
> EpilogueVectorizerEpilogueLoop::createEpilogueVectorizedLoopSkeleton() {
> >
> > DT->changeImmediateDominator(LoopScalarPreHeader,
> > EPI.EpilogueIterationCountCheck);
> > - if (!Cost->requiresScalarEpilogue())
> > - // If there is an epilogue which must run, there's no edge from the
> > - // middle block to exit blocks and thus no need to update the
> immediate
> > - // dominator of the exit blocks.
> > - DT->changeImmediateDominator(LoopExitBlock,
> > - EPI.EpilogueIterationCountCheck);
> > + DT->changeImmediateDominator(LoopExitBlock,
> EPI.EpilogueIterationCountCheck);
> >
> > // Keep track of bypass blocks, as they feed start values to the
> induction
> > // phis in the scalar loop preheader.
> >
> > diff --git
> a/llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll
> b/llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll
> > index ec280bf5d5e4..7d4a3c5c9935 100644
> > ---
> a/llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll
> > +++
> b/llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll
> > @@ -471,9 +471,10 @@ define i16 @multiple_exit(i16* %p, i32 %n) {
> > ; CHECK-NEXT: [[TMP15:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
> > ; CHECK-NEXT: br i1 [[TMP15]], label [[MIDDLE_BLOCK:%.*]], label
> [[VECTOR_BODY]], [[LOOP6:!llvm.loop !.*]]
> > ; CHECK: middle.block:
> > +; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[TMP2]], [[N_VEC]]
> > ; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <4 x
> i16> [[WIDE_LOAD]], i32 3
> > ; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]] = extractelement
> <4 x i16> [[WIDE_LOAD]], i32 2
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: br i1 [[CMP_N]], label [[IF_END:%.*]], label
> [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi i16 [ 0,
> [[ENTRY:%.*]] ], [ [[VECTOR_RECUR_EXTRACT]], [[MIDDLE_BLOCK]] ]
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ]
> > @@ -485,14 +486,14 @@ define i16 @multiple_exit(i16* %p, i32 %n) {
> > ; CHECK-NEXT: [[B:%.*]] = getelementptr inbounds i16, i16* [[P]],
> i64 [[IPROM]]
> > ; CHECK-NEXT: [[REC_NEXT]] = load i16, i16* [[B]], align 2
> > ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
> > -; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END:%.*]]
> > +; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END]]
> > ; CHECK: for.body:
> > ; CHECK-NEXT: store i16 [[SCALAR_RECUR]], i16* [[B]], align 4
> > ; CHECK-NEXT: [[INC]] = add nsw i32 [[I]], 1
> > ; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i32 [[I]], 2096
> > ; CHECK-NEXT: br i1 [[CMP2]], label [[FOR_COND]], label [[IF_END]],
> [[LOOP7:!llvm.loop !.*]]
> > ; CHECK: if.end:
> > -; CHECK-NEXT: [[REC_LCSSA:%.*]] = phi i16 [ [[SCALAR_RECUR]],
> [[FOR_BODY]] ], [ [[SCALAR_RECUR]], [[FOR_COND]] ]
> > +; CHECK-NEXT: [[REC_LCSSA:%.*]] = phi i16 [ [[SCALAR_RECUR]],
> [[FOR_BODY]] ], [ [[SCALAR_RECUR]], [[FOR_COND]] ], [
> [[VECTOR_RECUR_EXTRACT_FOR_PHI]], [[MIDDLE_BLOCK]] ]
> > ; CHECK-NEXT: ret i16 [[REC_LCSSA]]
> > ;
> > entry:
> > @@ -557,9 +558,10 @@ define i16 @multiple_exit2(i16* %p, i32 %n) {
> > ; CHECK-NEXT: [[TMP15:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
> > ; CHECK-NEXT: br i1 [[TMP15]], label [[MIDDLE_BLOCK:%.*]], label
> [[VECTOR_BODY]], [[LOOP8:!llvm.loop !.*]]
> > ; CHECK: middle.block:
> > +; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[TMP2]], [[N_VEC]]
> > ; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <4 x
> i16> [[WIDE_LOAD]], i32 3
> > ; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]] = extractelement
> <4 x i16> [[WIDE_LOAD]], i32 2
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: br i1 [[CMP_N]], label [[IF_END:%.*]], label
> [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi i16 [ 0,
> [[ENTRY:%.*]] ], [ [[VECTOR_RECUR_EXTRACT]], [[MIDDLE_BLOCK]] ]
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ]
> > @@ -571,14 +573,14 @@ define i16 @multiple_exit2(i16* %p, i32 %n) {
> > ; CHECK-NEXT: [[B:%.*]] = getelementptr inbounds i16, i16* [[P]],
> i64 [[IPROM]]
> > ; CHECK-NEXT: [[REC_NEXT]] = load i16, i16* [[B]], align 2
> > ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
> > -; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END:%.*]]
> > +; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END]]
> > ; CHECK: for.body:
> > ; CHECK-NEXT: store i16 [[SCALAR_RECUR]], i16* [[B]], align 4
> > ; CHECK-NEXT: [[INC]] = add nsw i32 [[I]], 1
> > ; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i32 [[I]], 2096
> > ; CHECK-NEXT: br i1 [[CMP2]], label [[FOR_COND]], label [[IF_END]],
> [[LOOP9:!llvm.loop !.*]]
> > ; CHECK: if.end:
> > -; CHECK-NEXT: [[REC_LCSSA:%.*]] = phi i16 [ [[SCALAR_RECUR]],
> [[FOR_COND]] ], [ 10, [[FOR_BODY]] ]
> > +; CHECK-NEXT: [[REC_LCSSA:%.*]] = phi i16 [ [[SCALAR_RECUR]],
> [[FOR_COND]] ], [ 10, [[FOR_BODY]] ], [ [[VECTOR_RECUR_EXTRACT_FOR_PHI]],
> [[MIDDLE_BLOCK]] ]
> > ; CHECK-NEXT: ret i16 [[REC_LCSSA]]
> > ;
> > entry:
> >
> > diff --git a/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll
> b/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll
> > index f0ba677348ab..0d4bdf0ecac3 100644
> > --- a/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll
> > +++ b/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll
> > @@ -447,7 +447,7 @@ define void @even_load_static_tc(i32* noalias
> nocapture readonly %A, i32* noalia
> > ; CHECK-NEXT: [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 508
> > ; CHECK-NEXT: br i1 [[TMP6]], label [[MIDDLE_BLOCK:%.*]], label
> [[VECTOR_BODY]], [[LOOP12:!llvm.loop !.*]]
> > ; CHECK: middle.block:
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: br i1 false, label [[FOR_COND_CLEANUP:%.*]], label
> [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 1016,
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: br label [[FOR_BODY:%.*]]
> > @@ -463,7 +463,7 @@ define void @even_load_static_tc(i32* noalias
> nocapture readonly %A, i32* noalia
> > ; CHECK-NEXT: store i32 [[MUL]], i32* [[ARRAYIDX2]], align 4
> > ; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]],
> 2
> > ; CHECK-NEXT: [[CMP:%.*]] = icmp ult i64 [[INDVARS_IV]], 1022
> > -; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label
> [[FOR_COND_CLEANUP:%.*]], [[LOOP13:!llvm.loop !.*]]
> > +; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label
> [[FOR_COND_CLEANUP]], [[LOOP13:!llvm.loop !.*]]
> > ;
> > entry:
> > br label %for.body
> > @@ -528,7 +528,7 @@ define void @even_load_dynamic_tc(i32* noalias
> nocapture readonly %A, i32* noali
> > ; CHECK-NEXT: [[TMP12:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
> > ; CHECK-NEXT: br i1 [[TMP12]], label [[MIDDLE_BLOCK:%.*]], label
> [[VECTOR_BODY]], [[LOOP14:!llvm.loop !.*]]
> > ; CHECK: middle.block:
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: br i1 false, label [[FOR_COND_CLEANUP:%.*]], label
> [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: br label [[FOR_BODY:%.*]]
> > @@ -544,7 +544,7 @@ define void @even_load_dynamic_tc(i32* noalias
> nocapture readonly %A, i32* noali
> > ; CHECK-NEXT: store i32 [[MUL]], i32* [[ARRAYIDX2]], align 4
> > ; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]],
> 2
> > ; CHECK-NEXT: [[CMP:%.*]] = icmp ult i64 [[INDVARS_IV_NEXT]], [[N]]
> > -; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label
> [[FOR_COND_CLEANUP:%.*]], [[LOOP15:!llvm.loop !.*]]
> > +; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label
> [[FOR_COND_CLEANUP]], [[LOOP15:!llvm.loop !.*]]
> > ;
> > entry:
> > br label %for.body
> > @@ -973,7 +973,7 @@ define void @PR27626_0(%pair.i32 *%p, i32 %z, i64
> %n) {
> > ; CHECK-NEXT: [[TMP19:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
> > ; CHECK-NEXT: br i1 [[TMP19]], label [[MIDDLE_BLOCK:%.*]], label
> [[VECTOR_BODY]], [[LOOP24:!llvm.loop !.*]]
> > ; CHECK: middle.block:
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: br i1 false, label [[FOR_END:%.*]], label [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: br label [[FOR_BODY:%.*]]
> > @@ -985,7 +985,7 @@ define void @PR27626_0(%pair.i32 *%p, i32 %z, i64
> %n) {
> > ; CHECK-NEXT: store i32 [[Z]], i32* [[P_I_Y]], align 4
> > ; CHECK-NEXT: [[I_NEXT]] = add nuw nsw i64 [[I]], 1
> > ; CHECK-NEXT: [[COND:%.*]] = icmp slt i64 [[I_NEXT]], [[N]]
> > -; CHECK-NEXT: br i1 [[COND]], label [[FOR_BODY]], label
> [[FOR_END:%.*]], [[LOOP25:!llvm.loop !.*]]
> > +; CHECK-NEXT: br i1 [[COND]], label [[FOR_BODY]], label [[FOR_END]],
> [[LOOP25:!llvm.loop !.*]]
> > ; CHECK: for.end:
> > ; CHECK-NEXT: ret void
> > ;
> > @@ -1066,7 +1066,7 @@ define i32 @PR27626_1(%pair.i32 *%p, i64 %n) {
> > ; CHECK-NEXT: [[RDX_SHUF3:%.*]] = shufflevector <4 x i32>
> [[BIN_RDX]], <4 x i32> poison, <4 x i32> <i32 1, i32 undef, i32 undef, i32
> undef>
> > ; CHECK-NEXT: [[BIN_RDX4:%.*]] = add <4 x i32> [[BIN_RDX]],
> [[RDX_SHUF3]]
> > ; CHECK-NEXT: [[TMP19:%.*]] = extractelement <4 x i32>
> [[BIN_RDX4]], i32 0
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: br i1 false, label [[FOR_END:%.*]], label [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i32 [ [[TMP19]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ]
> > @@ -1081,9 +1081,10 @@ define i32 @PR27626_1(%pair.i32 *%p, i64 %n) {
> > ; CHECK-NEXT: [[TMP21]] = add nsw i32 [[TMP20]], [[S]]
> > ; CHECK-NEXT: [[I_NEXT]] = add nuw nsw i64 [[I]], 1
> > ; CHECK-NEXT: [[COND:%.*]] = icmp slt i64 [[I_NEXT]], [[N]]
> > -; CHECK-NEXT: br i1 [[COND]], label [[FOR_BODY]], label
> [[FOR_END:%.*]], [[LOOP27:!llvm.loop !.*]]
> > +; CHECK-NEXT: br i1 [[COND]], label [[FOR_BODY]], label [[FOR_END]],
> [[LOOP27:!llvm.loop !.*]]
> > ; CHECK: for.end:
> > -; CHECK-NEXT: ret i32 [[TMP21]]
> > +; CHECK-NEXT: [[TMP22:%.*]] = phi i32 [ [[TMP21]], [[FOR_BODY]] ], [
> [[TMP19]], [[MIDDLE_BLOCK]] ]
> > +; CHECK-NEXT: ret i32 [[TMP22]]
> > ;
> > entry:
> > br label %for.body
> > @@ -1162,7 +1163,7 @@ define void @PR27626_2(%pair.i32 *%p, i64 %n, i32
> %z) {
> > ; CHECK-NEXT: [[TMP20:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
> > ; CHECK-NEXT: br i1 [[TMP20]], label [[MIDDLE_BLOCK:%.*]], label
> [[VECTOR_BODY]], [[LOOP28:!llvm.loop !.*]]
> > ; CHECK: middle.block:
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: br i1 false, label [[FOR_END:%.*]], label [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: br label [[FOR_BODY:%.*]]
> > @@ -1176,7 +1177,7 @@ define void @PR27626_2(%pair.i32 *%p, i64 %n, i32
> %z) {
> > ; CHECK-NEXT: store i32 [[TMP21]], i32* [[P_I_Y]], align 4
> > ; CHECK-NEXT: [[I_NEXT]] = add nuw nsw i64 [[I]], 1
> > ; CHECK-NEXT: [[COND:%.*]] = icmp slt i64 [[I_NEXT]], [[N]]
> > -; CHECK-NEXT: br i1 [[COND]], label [[FOR_BODY]], label
> [[FOR_END:%.*]], [[LOOP29:!llvm.loop !.*]]
> > +; CHECK-NEXT: br i1 [[COND]], label [[FOR_BODY]], label [[FOR_END]],
> [[LOOP29:!llvm.loop !.*]]
> > ; CHECK: for.end:
> > ; CHECK-NEXT: ret void
> > ;
> > @@ -1263,7 +1264,7 @@ define i32 @PR27626_3(%pair.i32 *%p, i64 %n, i32
> %z) {
> > ; CHECK-NEXT: [[RDX_SHUF3:%.*]] = shufflevector <4 x i32>
> [[BIN_RDX]], <4 x i32> poison, <4 x i32> <i32 1, i32 undef, i32 undef, i32
> undef>
> > ; CHECK-NEXT: [[BIN_RDX4:%.*]] = add <4 x i32> [[BIN_RDX]],
> [[RDX_SHUF3]]
> > ; CHECK-NEXT: [[TMP22:%.*]] = extractelement <4 x i32>
> [[BIN_RDX4]], i32 0
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: br i1 false, label [[FOR_END:%.*]], label [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i32 [ [[TMP22]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ]
> > @@ -1281,9 +1282,10 @@ define i32 @PR27626_3(%pair.i32 *%p, i64 %n, i32
> %z) {
> > ; CHECK-NEXT: [[TMP25]] = add nsw i32 [[TMP24]], [[S]]
> > ; CHECK-NEXT: [[I_NEXT]] = add nuw nsw i64 [[I]], 1
> > ; CHECK-NEXT: [[COND:%.*]] = icmp slt i64 [[I_NEXT]], [[N]]
> > -; CHECK-NEXT: br i1 [[COND]], label [[FOR_BODY]], label
> [[FOR_END:%.*]], [[LOOP31:!llvm.loop !.*]]
> > +; CHECK-NEXT: br i1 [[COND]], label [[FOR_BODY]], label [[FOR_END]],
> [[LOOP31:!llvm.loop !.*]]
> > ; CHECK: for.end:
> > -; CHECK-NEXT: ret i32 [[TMP25]]
> > +; CHECK-NEXT: [[TMP26:%.*]] = phi i32 [ [[TMP25]], [[FOR_BODY]] ], [
> [[TMP22]], [[MIDDLE_BLOCK]] ]
> > +; CHECK-NEXT: ret i32 [[TMP26]]
> > ;
> > entry:
> > br label %for.body
> >
> > diff --git a/llvm/test/Transforms/LoopVectorize/loop-form.ll
> b/llvm/test/Transforms/LoopVectorize/loop-form.ll
> > index f32002fae2b6..91780789088b 100644
> > --- a/llvm/test/Transforms/LoopVectorize/loop-form.ll
> > +++ b/llvm/test/Transforms/LoopVectorize/loop-form.ll
> > @@ -146,14 +146,15 @@ define void @early_exit(i16* %p, i32 %n) {
> > ; CHECK-NEXT: [[TMP10:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
> > ; CHECK-NEXT: br i1 [[TMP10]], label [[MIDDLE_BLOCK:%.*]], label
> [[VECTOR_BODY]], [[LOOP4:!llvm.loop !.*]]
> > ; CHECK: middle.block:
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[TMP1]], [[N_VEC]]
> > +; CHECK-NEXT: br i1 [[CMP_N]], label [[IF_END:%.*]], label
> [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: br label [[FOR_COND:%.*]]
> > ; CHECK: for.cond:
> > ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[BC_RESUME_VAL]],
> [[SCALAR_PH]] ], [ [[INC:%.*]], [[FOR_BODY:%.*]] ]
> > ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
> > -; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END:%.*]]
> > +; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END]]
> > ; CHECK: for.body:
> > ; CHECK-NEXT: [[IPROM:%.*]] = sext i32 [[I]] to i64
> > ; CHECK-NEXT: [[B:%.*]] = getelementptr inbounds i16, i16* [[P]],
> i64 [[IPROM]]
> > @@ -285,14 +286,15 @@ define void @multiple_unique_exit(i16* %p, i32 %n)
> {
> > ; CHECK-NEXT: [[TMP11:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
> > ; CHECK-NEXT: br i1 [[TMP11]], label [[MIDDLE_BLOCK:%.*]], label
> [[VECTOR_BODY]], [[LOOP6:!llvm.loop !.*]]
> > ; CHECK: middle.block:
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[TMP2]], [[N_VEC]]
> > +; CHECK-NEXT: br i1 [[CMP_N]], label [[IF_END:%.*]], label
> [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: br label [[FOR_COND:%.*]]
> > ; CHECK: for.cond:
> > ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[BC_RESUME_VAL]],
> [[SCALAR_PH]] ], [ [[INC:%.*]], [[FOR_BODY:%.*]] ]
> > ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
> > -; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END:%.*]]
> > +; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END]]
> > ; CHECK: for.body:
> > ; CHECK-NEXT: [[IPROM:%.*]] = sext i32 [[I]] to i64
> > ; CHECK-NEXT: [[B:%.*]] = getelementptr inbounds i16, i16* [[P]],
> i64 [[IPROM]]
> > @@ -372,14 +374,17 @@ define i32 @multiple_unique_exit2(i16* %p, i32 %n)
> {
> > ; CHECK-NEXT: [[TMP11:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
> > ; CHECK-NEXT: br i1 [[TMP11]], label [[MIDDLE_BLOCK:%.*]], label
> [[VECTOR_BODY]], [[LOOP8:!llvm.loop !.*]]
> > ; CHECK: middle.block:
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[TMP2]], [[N_VEC]]
> > +; CHECK-NEXT: [[IND_ESCAPE:%.*]] = sub i32 [[N_VEC]], 1
> > +; CHECK-NEXT: [[IND_ESCAPE1:%.*]] = sub i32 [[N_VEC]], 1
> > +; CHECK-NEXT: br i1 [[CMP_N]], label [[IF_END:%.*]], label
> [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: br label [[FOR_COND:%.*]]
> > ; CHECK: for.cond:
> > ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[BC_RESUME_VAL]],
> [[SCALAR_PH]] ], [ [[INC:%.*]], [[FOR_BODY:%.*]] ]
> > ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
> > -; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END:%.*]]
> > +; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END]]
> > ; CHECK: for.body:
> > ; CHECK-NEXT: [[IPROM:%.*]] = sext i32 [[I]] to i64
> > ; CHECK-NEXT: [[B:%.*]] = getelementptr inbounds i16, i16* [[P]],
> i64 [[IPROM]]
> > @@ -388,7 +393,7 @@ define i32 @multiple_unique_exit2(i16* %p, i32 %n) {
> > ; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i32 [[I]], 2096
> > ; CHECK-NEXT: br i1 [[CMP2]], label [[FOR_COND]], label [[IF_END]],
> [[LOOP9:!llvm.loop !.*]]
> > ; CHECK: if.end:
> > -; CHECK-NEXT: [[I_LCSSA:%.*]] = phi i32 [ [[I]], [[FOR_BODY]] ], [
> [[I]], [[FOR_COND]] ]
> > +; CHECK-NEXT: [[I_LCSSA:%.*]] = phi i32 [ [[I]], [[FOR_BODY]] ], [
> [[I]], [[FOR_COND]] ], [ [[IND_ESCAPE1]], [[MIDDLE_BLOCK]] ]
> > ; CHECK-NEXT: ret i32 [[I_LCSSA]]
> > ;
> > ; TAILFOLD-LABEL: @multiple_unique_exit2(
> > @@ -461,14 +466,15 @@ define i32 @multiple_unique_exit3(i16* %p, i32 %n)
> {
> > ; CHECK-NEXT: [[TMP11:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
> > ; CHECK-NEXT: br i1 [[TMP11]], label [[MIDDLE_BLOCK:%.*]], label
> [[VECTOR_BODY]], [[LOOP10:!llvm.loop !.*]]
> > ; CHECK: middle.block:
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[TMP2]], [[N_VEC]]
> > +; CHECK-NEXT: br i1 [[CMP_N]], label [[IF_END:%.*]], label
> [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]],
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: br label [[FOR_COND:%.*]]
> > ; CHECK: for.cond:
> > ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[BC_RESUME_VAL]],
> [[SCALAR_PH]] ], [ [[INC:%.*]], [[FOR_BODY:%.*]] ]
> > ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
> > -; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END:%.*]]
> > +; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END]]
> > ; CHECK: for.body:
> > ; CHECK-NEXT: [[IPROM:%.*]] = sext i32 [[I]] to i64
> > ; CHECK-NEXT: [[B:%.*]] = getelementptr inbounds i16, i16* [[P]],
> i64 [[IPROM]]
> > @@ -477,7 +483,7 @@ define i32 @multiple_unique_exit3(i16* %p, i32 %n) {
> > ; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i32 [[I]], 2096
> > ; CHECK-NEXT: br i1 [[CMP2]], label [[FOR_COND]], label [[IF_END]],
> [[LOOP11:!llvm.loop !.*]]
> > ; CHECK: if.end:
> > -; CHECK-NEXT: [[EXIT:%.*]] = phi i32 [ 0, [[FOR_COND]] ], [ 1,
> [[FOR_BODY]] ]
> > +; CHECK-NEXT: [[EXIT:%.*]] = phi i32 [ 0, [[FOR_COND]] ], [ 1,
> [[FOR_BODY]] ], [ 0, [[MIDDLE_BLOCK]] ]
> > ; CHECK-NEXT: ret i32 [[EXIT]]
> > ;
> > ; TAILFOLD-LABEL: @multiple_unique_exit3(
> > @@ -994,7 +1000,8 @@ define void @scalar_predication(float* %addr) {
> > ; CHECK-NEXT: [[TMP10:%.*]] = icmp eq i64 [[INDEX_NEXT]], 200
> > ; CHECK-NEXT: br i1 [[TMP10]], label [[MIDDLE_BLOCK:%.*]], label
> [[VECTOR_BODY]], [[LOOP12:!llvm.loop !.*]]
> > ; CHECK: middle.block:
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 201, 200
> > +; CHECK-NEXT: br i1 [[CMP_N]], label [[EXIT:%.*]], label
> [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 200,
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
> > @@ -1002,7 +1009,7 @@ define void @scalar_predication(float* %addr) {
> > ; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]],
> [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
> > ; CHECK-NEXT: [[GEP:%.*]] = getelementptr float, float* [[ADDR]],
> i64 [[IV]]
> > ; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV]], 200
> > -; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT:%.*]], label
> [[LOOP_BODY:%.*]]
> > +; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT]], label
> [[LOOP_BODY:%.*]]
> > ; CHECK: loop.body:
> > ; CHECK-NEXT: [[TMP11:%.*]] = load float, float* [[GEP]], align 4
> > ; CHECK-NEXT: [[PRED:%.*]] = fcmp oeq float [[TMP11]], 0.000000e+00
> > @@ -1088,7 +1095,8 @@ define i32 @me_reduction(i32* %addr) {
> > ; CHECK-NEXT: [[RDX_SHUF:%.*]] = shufflevector <2 x i32> [[TMP5]],
> <2 x i32> poison, <2 x i32> <i32 1, i32 undef>
> > ; CHECK-NEXT: [[BIN_RDX:%.*]] = add <2 x i32> [[TMP5]], [[RDX_SHUF]]
> > ; CHECK-NEXT: [[TMP7:%.*]] = extractelement <2 x i32> [[BIN_RDX]],
> i32 0
> > -; CHECK-NEXT: br label [[SCALAR_PH]]
> > +; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 201, 200
> > +; CHECK-NEXT: br i1 [[CMP_N]], label [[EXIT:%.*]], label
> [[SCALAR_PH]]
> > ; CHECK: scalar.ph:
> > ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 200,
> [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
> > ; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i32 [ 0, [[ENTRY]] ], [
> [[TMP7]], [[MIDDLE_BLOCK]] ]
> > @@ -1098,7 +1106,7 @@ define i32 @me_reduction(i32* %addr) {
> > ; CHECK-NEXT: [[ACCUM:%.*]] = phi i32 [ [[BC_MERGE_RDX]],
> [[SCALAR_PH]] ], [ [[ACCUM_NEXT:%.*]], [[LOOP_LATCH]] ]
> > ; CHECK-NEXT: [[GEP:%.*]] = getelementptr i32, i32* [[ADDR]], i64
> [[IV]]
> > ; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV]], 200
> > -; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT:%.*]], label
> [[LOOP_LATCH]]
> > +; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT]], label
> [[LOOP_LATCH]]
> > ; CHECK: loop.latch:
> > ; CHECK-NEXT: [[TMP8:%.*]] = load i32, i32* [[GEP]], align 4
> > ; CHECK-NEXT: [[ACCUM_NEXT]] = add i32 [[ACCUM]], [[TMP8]]
> > @@ -1106,7 +1114,7 @@ define i32 @me_reduction(i32* %addr) {
> > ; CHECK-NEXT: [[EXITCOND2_NOT:%.*]] = icmp eq i64 [[IV]], 400
> > ; CHECK-NEXT: br i1 [[EXITCOND2_NOT]], label [[EXIT]], label
> [[LOOP_HEADER]], [[LOOP15:!llvm.loop !.*]]
> > ; CHECK: exit:
> > -; CHECK-NEXT: [[LCSSA:%.*]] = phi i32 [ 0, [[LOOP_HEADER]] ], [
> [[ACCUM_NEXT]], [[LOOP_LATCH]] ]
> > +; CHECK-NEXT: [[LCSSA:%.*]] = phi i32 [ 0, [[LOOP_HEADER]] ], [
> [[ACCUM_NEXT]], [[LOOP_LATCH]] ], [ [[TMP7]], [[MIDDLE_BLOCK]] ]
> > ; CHECK-NEXT: ret i32 [[LCSSA]]
> > ;
> > ; TAILFOLD-LABEL: @me_reduction(
> >
> >
> >
> > _______________________________________________
> > llvm-commits mailing list
> > llvm-commits at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
>
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