[llvm] 21f226f - [SimpleLoopUnswitch] unswitch selects
Joshua Cao via llvm-commits
llvm-commits at lists.llvm.org
Wed May 10 00:43:29 PDT 2023
Author: Joshua Cao
Date: 2023-05-10T00:40:28-07:00
New Revision: 21f226fc4591db6e98faf380137a42067c909582
URL: https://github.com/llvm/llvm-project/commit/21f226fc4591db6e98faf380137a42067c909582
DIFF: https://github.com/llvm/llvm-project/commit/21f226fc4591db6e98faf380137a42067c909582.diff
LOG: [SimpleLoopUnswitch] unswitch selects
The old LoopUnswitch pass unswitched selects, but the changes were never
ported to the new SimpleLoopUnswitch.
We unswitch by turning:
```
S = select %cond, %a, %b
```
into:
```
head:
br %cond, label %then, label %tail
then:
br label %tail
tail:
S = phi [ %a, %then ], [ %b, %head ]
```
Unswitch selects are always nontrivial, since the successors do not exit
the loop and the loop body always needs to be cloned.
Unswitch selects always need to freeze the conditional if the
conditional could be poison or undef. Selects don't propagate
poison/undef, and branches on poison/undef causes UB.
Reviewed By: nikic, kachkov98, vitalybuka
Differential Revision: https://reviews.llvm.org/D138526
Added:
Modified:
llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-freeze.ll
llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-select.ll
llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-trivial-select.ll
Removed:
################################################################################
diff --git a/llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp b/llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
index 461272f1ee86d..874fe4a200523 100644
--- a/llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
+++ b/llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
@@ -19,6 +19,7 @@
#include "llvm/Analysis/BlockFrequencyInfo.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/CodeMetrics.h"
+#include "llvm/Analysis/DomTreeUpdater.h"
#include "llvm/Analysis/GuardUtils.h"
#include "llvm/Analysis/LoopAnalysisManager.h"
#include "llvm/Analysis/LoopInfo.h"
@@ -74,6 +75,7 @@ using namespace llvm::PatternMatch;
STATISTIC(NumBranches, "Number of branches unswitched");
STATISTIC(NumSwitches, "Number of switches unswitched");
+STATISTIC(NumSelects, "Number of selects turned into branches for unswitching");
STATISTIC(NumGuards, "Number of guards turned into branches for unswitching");
STATISTIC(NumTrivial, "Number of unswitches that are trivial");
STATISTIC(
@@ -2126,7 +2128,7 @@ static void unswitchNontrivialInvariants(
AssumptionCache &AC,
function_ref<void(bool, bool, ArrayRef<Loop *>)> UnswitchCB,
ScalarEvolution *SE, MemorySSAUpdater *MSSAU,
- function_ref<void(Loop &, StringRef)> DestroyLoopCB) {
+ function_ref<void(Loop &, StringRef)> DestroyLoopCB, bool InsertFreeze) {
auto *ParentBB = TI.getParent();
BranchInst *BI = dyn_cast<BranchInst>(&TI);
SwitchInst *SI = BI ? nullptr : cast<SwitchInst>(&TI);
@@ -2230,25 +2232,6 @@ static void unswitchNontrivialInvariants(
SE->forgetBlockAndLoopDispositions();
}
- bool InsertFreeze = false;
- if (FreezeLoopUnswitchCond) {
- ICFLoopSafetyInfo SafetyInfo;
- SafetyInfo.computeLoopSafetyInfo(&L);
- InsertFreeze = !SafetyInfo.isGuaranteedToExecute(TI, &DT, &L);
- }
-
- // Perform the isGuaranteedNotToBeUndefOrPoison() query before the transform,
- // otherwise the branch instruction will have been moved outside the loop
- // already, and may imply that a poison condition is always UB.
- Value *FullUnswitchCond = nullptr;
- if (FullUnswitch) {
- FullUnswitchCond =
- BI ? skipTrivialSelect(BI->getCondition()) : SI->getCondition();
- if (InsertFreeze)
- InsertFreeze = !isGuaranteedNotToBeUndefOrPoison(
- FullUnswitchCond, &AC, L.getLoopPreheader()->getTerminator(), &DT);
- }
-
// If the edge from this terminator to a successor dominates that successor,
// store a map from each block in its dominator subtree to it. This lets us
// tell when cloning for a particular successor if a block is dominated by
@@ -2323,10 +2306,11 @@ static void unswitchNontrivialInvariants(
BasicBlock *ClonedPH = ClonedPHs.begin()->second;
BI->setSuccessor(ClonedSucc, ClonedPH);
BI->setSuccessor(1 - ClonedSucc, LoopPH);
+ Value *Cond = skipTrivialSelect(BI->getCondition());
if (InsertFreeze)
- FullUnswitchCond = new FreezeInst(
- FullUnswitchCond, FullUnswitchCond->getName() + ".fr", BI);
- BI->setCondition(FullUnswitchCond);
+ Cond = new FreezeInst(
+ Cond, Cond->getName() + ".fr", BI);
+ BI->setCondition(Cond);
DTUpdates.push_back({DominatorTree::Insert, SplitBB, ClonedPH});
} else {
assert(SI && "Must either be a branch or switch!");
@@ -2343,7 +2327,7 @@ static void unswitchNontrivialInvariants(
if (InsertFreeze)
SI->setCondition(new FreezeInst(
- FullUnswitchCond, FullUnswitchCond->getName() + ".fr", SI));
+ SI->getCondition(), SI->getCondition()->getName() + ".fr", SI));
// We need to use the set to populate domtree updates as even when there
// are multiple cases pointing at the same successor we only want to
@@ -2642,6 +2626,58 @@ static InstructionCost computeDomSubtreeCost(
return Cost;
}
+/// Turns a select instruction into implicit control flow branch,
+/// making the following replacement:
+///
+/// head:
+/// --code before select--
+/// select %cond, %trueval, %falseval
+/// --code after select--
+///
+/// into
+///
+/// head:
+/// --code before select--
+/// br i1 %cond, label %then, label %tail
+///
+/// then:
+/// br %tail
+///
+/// tail:
+/// phi [ %trueval, %then ], [ %falseval, %head]
+/// unreachable
+///
+/// It also makes all relevant DT and LI updates, so that all structures are in
+/// valid state after this transform.
+static BranchInst *turnSelectIntoBranch(SelectInst *SI, DominatorTree &DT,
+ LoopInfo &LI, MemorySSAUpdater *MSSAU,
+ AssumptionCache *AC) {
+ LLVM_DEBUG(dbgs() << "Turning " << *SI << " into a branch.\n");
+ BasicBlock *HeadBB = SI->getParent();
+
+ DomTreeUpdater DTU =
+ DomTreeUpdater(DT, DomTreeUpdater::UpdateStrategy::Eager);
+ SplitBlockAndInsertIfThen(SI->getCondition(), SI, false,
+ SI->getMetadata(LLVMContext::MD_prof), &DTU, &LI);
+ auto *CondBr = cast<BranchInst>(HeadBB->getTerminator());
+ BasicBlock *ThenBB = CondBr->getSuccessor(0),
+ *TailBB = CondBr->getSuccessor(1);
+ if (MSSAU)
+ MSSAU->moveAllAfterSpliceBlocks(HeadBB, TailBB, SI);
+
+ PHINode *Phi = PHINode::Create(SI->getType(), 2, "unswitched.select", SI);
+ Phi->addIncoming(SI->getTrueValue(), ThenBB);
+ Phi->addIncoming(SI->getFalseValue(), HeadBB);
+ SI->replaceAllUsesWith(Phi);
+ SI->eraseFromParent();
+
+ if (MSSAU && VerifyMemorySSA)
+ MSSAU->getMemorySSA()->verifyMemorySSA();
+
+ ++NumSelects;
+ return CondBr;
+}
+
/// Turns a llvm.experimental.guard intrinsic into implicit control flow branch,
/// making the following replacement:
///
@@ -2749,9 +2785,10 @@ static int CalculateUnswitchCostMultiplier(
const BasicBlock *CondBlock = TI.getParent();
if (DT.dominates(CondBlock, Latch) &&
(isGuard(&TI) ||
- llvm::count_if(successors(&TI), [&L](const BasicBlock *SuccBB) {
- return L.contains(SuccBB);
- }) <= 1)) {
+ (TI.isTerminator() &&
+ llvm::count_if(successors(&TI), [&L](const BasicBlock *SuccBB) {
+ return L.contains(SuccBB);
+ }) <= 1))) {
NumCostMultiplierSkipped++;
return 1;
}
@@ -2760,12 +2797,17 @@ static int CalculateUnswitchCostMultiplier(
int SiblingsCount = (ParentL ? ParentL->getSubLoopsVector().size()
: std::distance(LI.begin(), LI.end()));
// Count amount of clones that all the candidates might cause during
- // unswitching. Branch/guard counts as 1, switch counts as log2 of its cases.
+ // unswitching. Branch/guard/select counts as 1, switch counts as log2 of its
+ // cases.
int UnswitchedClones = 0;
for (const auto &Candidate : UnswitchCandidates) {
const Instruction *CI = Candidate.TI;
const BasicBlock *CondBlock = CI->getParent();
bool SkipExitingSuccessors = DT.dominates(CondBlock, Latch);
+ if (isa<SelectInst>(CI)) {
+ UnswitchedClones++;
+ continue;
+ }
if (isGuard(CI)) {
if (!SkipExitingSuccessors)
UnswitchedClones++;
@@ -2828,15 +2870,19 @@ static bool collectUnswitchCandidates(
if (LI.getLoopFor(BB) != &L)
continue;
- if (CollectGuards)
- for (auto &I : *BB)
- if (isGuard(&I)) {
- auto *Cond =
- skipTrivialSelect(cast<IntrinsicInst>(&I)->getArgOperand(0));
- // TODO: Support AND, OR conditions and partial unswitching.
- if (!isa<Constant>(Cond) && L.isLoopInvariant(Cond))
- UnswitchCandidates.push_back({&I, {Cond}});
- }
+ for (auto &I : *BB) {
+ if (auto *SI = dyn_cast<SelectInst>(&I)) {
+ auto *Cond = SI->getCondition();
+ if (!isa<Constant>(Cond) && L.isLoopInvariant(Cond))
+ UnswitchCandidates.push_back({&I, {Cond}});
+ } else if (CollectGuards && isGuard(&I)) {
+ auto *Cond =
+ skipTrivialSelect(cast<IntrinsicInst>(&I)->getArgOperand(0));
+ // TODO: Support AND, OR conditions and partial unswitching.
+ if (!isa<Constant>(Cond) && L.isLoopInvariant(Cond))
+ UnswitchCandidates.push_back({&I, {Cond}});
+ }
+ }
if (auto *SI = dyn_cast<SwitchInst>(BB->getTerminator())) {
// We can only consider fully loop-invariant switch conditions as we need
@@ -3338,7 +3384,8 @@ static NonTrivialUnswitchCandidate findBestNonTrivialUnswitchCandidate(
// loop. This is computing the new cost of unswitching a condition.
// Note that guards always have 2 unique successors that are implicit and
// will be materialized if we decide to unswitch it.
- int SuccessorsCount = isGuard(&TI) ? 2 : Visited.size();
+ int SuccessorsCount =
+ isGuard(&TI) || isa<SelectInst>(TI) ? 2 : Visited.size();
assert(SuccessorsCount > 1 &&
"Cannot unswitch a condition without multiple distinct successors!");
return (LoopCost - Cost) * (SuccessorsCount - 1);
@@ -3380,6 +3427,32 @@ static NonTrivialUnswitchCandidate findBestNonTrivialUnswitchCandidate(
return *Best;
}
+// Insert a freeze on an unswitched branch if all is true:
+// 1. freeze-loop-unswitch-cond option is true
+// 2. The branch may not execute in the loop pre-transformation. If a branch may
+// not execute and could cause UB, it would always cause UB if it is hoisted outside
+// of the loop. Insert a freeze to prevent this case.
+// 3. The branch condition may be poison or undef
+static bool shouldInsertFreeze(Loop &L, Instruction &TI, DominatorTree &DT,
+ AssumptionCache &AC) {
+ assert(isa<BranchInst>(TI) || isa<SwitchInst>(TI));
+ if (!FreezeLoopUnswitchCond)
+ return false;
+
+ ICFLoopSafetyInfo SafetyInfo;
+ SafetyInfo.computeLoopSafetyInfo(&L);
+ if (SafetyInfo.isGuaranteedToExecute(TI, &DT, &L))
+ return false;
+
+ Value *Cond;
+ if (BranchInst *BI = dyn_cast<BranchInst>(&TI))
+ Cond = skipTrivialSelect(BI->getCondition());
+ else
+ Cond = skipTrivialSelect(cast<SwitchInst>(&TI)->getCondition());
+ return !isGuaranteedNotToBeUndefOrPoison(
+ Cond, &AC, L.getLoopPreheader()->getTerminator(), &DT);
+}
+
static bool unswitchBestCondition(
Loop &L, DominatorTree &DT, LoopInfo &LI, AssumptionCache &AC,
AAResults &AA, TargetTransformInfo &TTI,
@@ -3424,15 +3497,28 @@ static bool unswitchBestCondition(
if (Best.TI != PartialIVCondBranch)
PartialIVInfo.InstToDuplicate.clear();
- // If the best candidate is a guard, turn it into a branch.
- if (isGuard(Best.TI))
- Best.TI =
- turnGuardIntoBranch(cast<IntrinsicInst>(Best.TI), L, DT, LI, MSSAU);
+ bool InsertFreeze;
+ if (auto *SI = dyn_cast<SelectInst>(Best.TI)) {
+ // If the best candidate is a select, turn it into a branch. Select
+ // instructions with a poison conditional do not propagate poison, but
+ // branching on poison causes UB. Insert a freeze on the select
+ // conditional to prevent UB after turning the select into a branch.
+ InsertFreeze = !isGuaranteedNotToBeUndefOrPoison(
+ SI->getCondition(), &AC, L.getLoopPreheader()->getTerminator(), &DT);
+ Best.TI = turnSelectIntoBranch(SI, DT, LI, MSSAU, &AC);
+ } else {
+ // If the best candidate is a guard, turn it into a branch.
+ if (isGuard(Best.TI))
+ Best.TI =
+ turnGuardIntoBranch(cast<IntrinsicInst>(Best.TI), L, DT, LI, MSSAU);
+ InsertFreeze = shouldInsertFreeze(L, *Best.TI, DT, AC);
+ }
LLVM_DEBUG(dbgs() << " Unswitching non-trivial (cost = " << Best.Cost
<< ") terminator: " << *Best.TI << "\n");
unswitchNontrivialInvariants(L, *Best.TI, Best.Invariants, PartialIVInfo, DT,
- LI, AC, UnswitchCB, SE, MSSAU, DestroyLoopCB);
+ LI, AC, UnswitchCB, SE, MSSAU, DestroyLoopCB,
+ InsertFreeze);
return true;
}
diff --git a/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-freeze.ll b/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-freeze.ll
index e511dac7fdca7..4f5a250d497a9 100644
--- a/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-freeze.ll
+++ b/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-freeze.ll
@@ -2332,21 +2332,26 @@ exit:
define i32 @test_partial_unswitch_all_conds_guaranteed_non_poison(i1 noundef %c.1, i1 noundef %c.2) {
; CHECK-LABEL: @test_partial_unswitch_all_conds_guaranteed_non_poison(
; CHECK-NEXT: entry:
-; CHECK-NEXT: [[TMP0:%.*]] = and i1 [[C_1:%.*]], [[C_2:%.*]]
-; CHECK-NEXT: br i1 [[TMP0]], label [[ENTRY_SPLIT:%.*]], label [[ENTRY_SPLIT_US:%.*]]
+; CHECK-NEXT: br i1 [[C_1:%.*]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
; CHECK: entry.split.us:
; CHECK-NEXT: br label [[LOOP_US:%.*]]
; CHECK: loop.us:
-; CHECK-NEXT: [[TMP1:%.*]] = call i32 @a()
-; CHECK-NEXT: br label [[EXIT_SPLIT_US:%.*]]
+; CHECK-NEXT: [[TMP0:%.*]] = call i32 @a()
+; CHECK-NEXT: br label [[TMP1:%.*]]
+; CHECK: 1:
+; CHECK-NEXT: br label [[TMP2:%.*]]
+; CHECK: 2:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US:%.*]] = phi i1 [ [[C_2:%.*]], [[TMP1]] ]
+; CHECK-NEXT: br i1 [[UNSWITCHED_SELECT_US]], label [[LOOP_US]], label [[EXIT_SPLIT_US:%.*]]
; CHECK: exit.split.us:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: entry.split:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
-; CHECK-NEXT: [[TMP2:%.*]] = call i32 @a()
-; CHECK-NEXT: [[SEL:%.*]] = select i1 true, i1 true, i1 false
-; CHECK-NEXT: br i1 [[SEL]], label [[LOOP]], label [[EXIT_SPLIT:%.*]]
+; CHECK-NEXT: [[TMP3:%.*]] = call i32 @a()
+; CHECK-NEXT: br label [[TMP4:%.*]]
+; CHECK: 4:
+; CHECK-NEXT: br i1 false, label [[LOOP]], label [[EXIT_SPLIT:%.*]]
; CHECK: exit.split:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
diff --git a/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-select.ll b/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-select.ll
index b44f09ca81c4d..f33b76fb03a79 100644
--- a/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-select.ll
+++ b/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-select.ll
@@ -10,20 +10,46 @@ define i32 @basic(i32 %N, i1 %cond, i32 %select_input) {
; CHECK-LABEL: define i32 @basic
; CHECK-SAME: (i32 [[N:%.*]], i1 [[COND:%.*]], i32 [[SELECT_INPUT:%.*]]) {
; CHECK-NEXT: entry:
+; CHECK-NEXT: [[COND_FR:%.*]] = freeze i1 [[COND]]
+; CHECK-NEXT: br i1 [[COND_FR]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
+; CHECK: entry.split.us:
+; CHECK-NEXT: br label [[FOR_COND_US:%.*]]
+; CHECK: for.cond.us:
+; CHECK-NEXT: [[RES_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[ADD_US:%.*]], [[TMP1:%.*]] ]
+; CHECK-NEXT: [[I_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[INC_US:%.*]], [[TMP1]] ]
+; CHECK-NEXT: [[CMP_US:%.*]] = icmp slt i32 [[I_US]], [[N]]
+; CHECK-NEXT: br i1 [[CMP_US]], label [[FOR_BODY_US:%.*]], label [[FOR_COND_CLEANUP_SPLIT_US:%.*]]
+; CHECK: for.body.us:
+; CHECK-NEXT: br label [[TMP0:%.*]]
+; CHECK: 0:
+; CHECK-NEXT: br label [[TMP1]]
+; CHECK: 1:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US:%.*]] = phi i32 [ [[SELECT_INPUT]], [[TMP0]] ]
+; CHECK-NEXT: [[ADD_US]] = add nuw nsw i32 [[UNSWITCHED_SELECT_US]], [[RES_US]]
+; CHECK-NEXT: [[INC_US]] = add nuw nsw i32 [[I_US]], 1
+; CHECK-NEXT: br label [[FOR_COND_US]]
+; CHECK: for.cond.cleanup.split.us:
+; CHECK-NEXT: [[RES_LCSSA_US:%.*]] = phi i32 [ [[RES_US]], [[FOR_COND_US]] ]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP:%.*]]
+; CHECK: entry.split:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
-; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ADD:%.*]], [[FOR_BODY:%.*]] ]
-; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[INC:%.*]], [[FOR_BODY]] ]
+; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[ADD:%.*]], [[TMP2:%.*]] ]
+; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[INC:%.*]], [[TMP2]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
-; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_COND_CLEANUP:%.*]]
+; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[FOR_COND_CLEANUP_SPLIT:%.*]]
; CHECK: for.body:
-; CHECK-NEXT: [[COND1:%.*]] = select i1 [[COND]], i32 [[SELECT_INPUT]], i32 42
-; CHECK-NEXT: [[ADD]] = add nuw nsw i32 [[COND1]], [[RES]]
+; CHECK-NEXT: br label [[TMP2]]
+; CHECK: 2:
+; CHECK-NEXT: [[ADD]] = add nuw nsw i32 42, [[RES]]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I]], 1
; CHECK-NEXT: br label [[FOR_COND]]
-; CHECK: for.cond.cleanup:
+; CHECK: for.cond.cleanup.split:
; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi i32 [ [[RES]], [[FOR_COND]] ]
-; CHECK-NEXT: ret i32 [[RES_LCSSA]]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP]]
+; CHECK: for.cond.cleanup:
+; CHECK-NEXT: [[DOTUS_PHI:%.*]] = phi i32 [ [[RES_LCSSA]], [[FOR_COND_CLEANUP_SPLIT]] ], [ [[RES_LCSSA_US]], [[FOR_COND_CLEANUP_SPLIT_US]] ]
+; CHECK-NEXT: ret i32 [[DOTUS_PHI]]
;
entry:
br label %for.cond
@@ -48,20 +74,46 @@ define i32 @select_phi_input(i32 %N, i1 %cond) {
; CHECK-LABEL: define i32 @select_phi_input
; CHECK-SAME: (i32 [[N:%.*]], i1 [[COND:%.*]]) {
; CHECK-NEXT: entry:
+; CHECK-NEXT: [[COND_FR:%.*]] = freeze i1 [[COND]]
+; CHECK-NEXT: br i1 [[COND_FR]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
+; CHECK: entry.split.us:
+; CHECK-NEXT: br label [[FOR_COND_US:%.*]]
+; CHECK: for.cond.us:
+; CHECK-NEXT: [[RES_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[ADD_US:%.*]], [[TMP1:%.*]] ]
+; CHECK-NEXT: [[I_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[INC_US:%.*]], [[TMP1]] ]
+; CHECK-NEXT: [[CMP_US:%.*]] = icmp slt i32 [[I_US]], [[N]]
+; CHECK-NEXT: br i1 [[CMP_US]], label [[FOR_BODY_US:%.*]], label [[FOR_COND_CLEANUP_SPLIT_US:%.*]]
+; CHECK: for.body.us:
+; CHECK-NEXT: br label [[TMP0:%.*]]
+; CHECK: 0:
+; CHECK-NEXT: br label [[TMP1]]
+; CHECK: 1:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US:%.*]] = phi i32 [ [[I_US]], [[TMP0]] ]
+; CHECK-NEXT: [[ADD_US]] = add nuw nsw i32 [[UNSWITCHED_SELECT_US]], [[RES_US]]
+; CHECK-NEXT: [[INC_US]] = add nuw nsw i32 [[I_US]], 1
+; CHECK-NEXT: br label [[FOR_COND_US]]
+; CHECK: for.cond.cleanup.split.us:
+; CHECK-NEXT: [[RES_LCSSA_US:%.*]] = phi i32 [ [[RES_US]], [[FOR_COND_US]] ]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP:%.*]]
+; CHECK: entry.split:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
-; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ADD:%.*]], [[FOR_BODY:%.*]] ]
-; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[INC:%.*]], [[FOR_BODY]] ]
+; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[ADD:%.*]], [[TMP2:%.*]] ]
+; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[INC:%.*]], [[TMP2]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
-; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_COND_CLEANUP:%.*]]
+; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[FOR_COND_CLEANUP_SPLIT:%.*]]
; CHECK: for.body:
-; CHECK-NEXT: [[COND1:%.*]] = select i1 [[COND]], i32 [[I]], i32 42
-; CHECK-NEXT: [[ADD]] = add nuw nsw i32 [[COND1]], [[RES]]
+; CHECK-NEXT: br label [[TMP2]]
+; CHECK: 2:
+; CHECK-NEXT: [[ADD]] = add nuw nsw i32 42, [[RES]]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I]], 1
; CHECK-NEXT: br label [[FOR_COND]]
-; CHECK: for.cond.cleanup:
+; CHECK: for.cond.cleanup.split:
; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi i32 [ [[RES]], [[FOR_COND]] ]
-; CHECK-NEXT: ret i32 [[RES_LCSSA]]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP]]
+; CHECK: for.cond.cleanup:
+; CHECK-NEXT: [[DOTUS_PHI:%.*]] = phi i32 [ [[RES_LCSSA]], [[FOR_COND_CLEANUP_SPLIT]] ], [ [[RES_LCSSA_US]], [[FOR_COND_CLEANUP_SPLIT_US]] ]
+; CHECK-NEXT: ret i32 [[DOTUS_PHI]]
;
entry:
br label %for.cond
@@ -86,20 +138,45 @@ define i32 @basic_cond_noundef(i32 %N, i1 noundef %cond) {
; CHECK-LABEL: define i32 @basic_cond_noundef
; CHECK-SAME: (i32 [[N:%.*]], i1 noundef [[COND:%.*]]) {
; CHECK-NEXT: entry:
+; CHECK-NEXT: br i1 [[COND]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
+; CHECK: entry.split.us:
+; CHECK-NEXT: br label [[FOR_COND_US:%.*]]
+; CHECK: for.cond.us:
+; CHECK-NEXT: [[RES_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[ADD_US:%.*]], [[TMP1:%.*]] ]
+; CHECK-NEXT: [[I_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[INC_US:%.*]], [[TMP1]] ]
+; CHECK-NEXT: [[CMP_US:%.*]] = icmp slt i32 [[I_US]], [[N]]
+; CHECK-NEXT: br i1 [[CMP_US]], label [[FOR_BODY_US:%.*]], label [[FOR_COND_CLEANUP_SPLIT_US:%.*]]
+; CHECK: for.body.us:
+; CHECK-NEXT: br label [[TMP0:%.*]]
+; CHECK: 0:
+; CHECK-NEXT: br label [[TMP1]]
+; CHECK: 1:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US:%.*]] = phi i32 [ [[I_US]], [[TMP0]] ]
+; CHECK-NEXT: [[ADD_US]] = add nuw nsw i32 [[UNSWITCHED_SELECT_US]], [[RES_US]]
+; CHECK-NEXT: [[INC_US]] = add nuw nsw i32 [[I_US]], 1
+; CHECK-NEXT: br label [[FOR_COND_US]]
+; CHECK: for.cond.cleanup.split.us:
+; CHECK-NEXT: [[RES_LCSSA_US:%.*]] = phi i32 [ [[RES_US]], [[FOR_COND_US]] ]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP:%.*]]
+; CHECK: entry.split:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
-; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ADD:%.*]], [[FOR_BODY:%.*]] ]
-; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[INC:%.*]], [[FOR_BODY]] ]
+; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[ADD:%.*]], [[TMP2:%.*]] ]
+; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[INC:%.*]], [[TMP2]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
-; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_COND_CLEANUP:%.*]]
+; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[FOR_COND_CLEANUP_SPLIT:%.*]]
; CHECK: for.body:
-; CHECK-NEXT: [[COND1:%.*]] = select i1 [[COND]], i32 [[I]], i32 42
-; CHECK-NEXT: [[ADD]] = add nuw nsw i32 [[COND1]], [[RES]]
+; CHECK-NEXT: br label [[TMP2]]
+; CHECK: 2:
+; CHECK-NEXT: [[ADD]] = add nuw nsw i32 42, [[RES]]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I]], 1
; CHECK-NEXT: br label [[FOR_COND]]
-; CHECK: for.cond.cleanup:
+; CHECK: for.cond.cleanup.split:
; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi i32 [ [[RES]], [[FOR_COND]] ]
-; CHECK-NEXT: ret i32 [[RES_LCSSA]]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP]]
+; CHECK: for.cond.cleanup:
+; CHECK-NEXT: [[DOTUS_PHI:%.*]] = phi i32 [ [[RES_LCSSA]], [[FOR_COND_CLEANUP_SPLIT]] ], [ [[RES_LCSSA_US]], [[FOR_COND_CLEANUP_SPLIT_US]] ]
+; CHECK-NEXT: ret i32 [[DOTUS_PHI]]
;
entry:
br label %for.cond
@@ -164,21 +241,107 @@ define i32 @chained_select(i32 %N, i1 %cond, i1 %cond2) {
; CHECK-LABEL: define i32 @chained_select
; CHECK-SAME: (i32 [[N:%.*]], i1 [[COND:%.*]], i1 [[COND2:%.*]]) {
; CHECK-NEXT: entry:
+; CHECK-NEXT: [[COND_FR:%.*]] = freeze i1 [[COND]]
+; CHECK-NEXT: br i1 [[COND_FR]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
+; CHECK: entry.split.us:
+; CHECK-NEXT: [[COND2_FR13:%.*]] = freeze i1 [[COND2]]
+; CHECK-NEXT: br i1 [[COND2_FR13]], label [[ENTRY_SPLIT_US_SPLIT_US:%.*]], label [[ENTRY_SPLIT_US_SPLIT:%.*]]
+; CHECK: entry.split.us.split.us:
+; CHECK-NEXT: br label [[FOR_COND_US_US:%.*]]
+; CHECK: for.cond.us.us:
+; CHECK-NEXT: [[RES_US_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US_SPLIT_US]] ], [ [[ADD_US_US:%.*]], [[TMP3:%.*]] ]
+; CHECK-NEXT: [[I_US_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US_SPLIT_US]] ], [ [[INC_US_US:%.*]], [[TMP3]] ]
+; CHECK-NEXT: [[CMP_US_US:%.*]] = icmp slt i32 [[I_US_US]], [[N]]
+; CHECK-NEXT: br i1 [[CMP_US_US]], label [[FOR_BODY_US_US:%.*]], label [[FOR_COND_CLEANUP_SPLIT_US_SPLIT_US:%.*]]
+; CHECK: for.body.us.us:
+; CHECK-NEXT: br label [[TMP0:%.*]]
+; CHECK: 0:
+; CHECK-NEXT: br label [[TMP1:%.*]]
+; CHECK: 1:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US_US:%.*]] = phi i32 [ [[I_US_US]], [[TMP0]] ]
+; CHECK-NEXT: br label [[TMP2:%.*]]
+; CHECK: 2:
+; CHECK-NEXT: br label [[TMP3]]
+; CHECK: 3:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US11:%.*]] = phi i32 [ [[UNSWITCHED_SELECT_US_US]], [[TMP2]] ]
+; CHECK-NEXT: [[ADD_US_US]] = add nuw nsw i32 [[UNSWITCHED_SELECT_US11]], [[RES_US_US]]
+; CHECK-NEXT: [[INC_US_US]] = add nuw nsw i32 [[I_US_US]], 1
+; CHECK-NEXT: br label [[FOR_COND_US_US]]
+; CHECK: for.cond.cleanup.split.us.split.us:
+; CHECK-NEXT: [[RES_LCSSA_US_US:%.*]] = phi i32 [ [[RES_US_US]], [[FOR_COND_US_US]] ]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP_SPLIT_US:%.*]]
+; CHECK: entry.split.us.split:
+; CHECK-NEXT: br label [[FOR_COND_US:%.*]]
+; CHECK: for.cond.us:
+; CHECK-NEXT: [[RES_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US_SPLIT]] ], [ [[ADD_US:%.*]], [[TMP6:%.*]] ]
+; CHECK-NEXT: [[I_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US_SPLIT]] ], [ [[INC_US:%.*]], [[TMP6]] ]
+; CHECK-NEXT: [[CMP_US:%.*]] = icmp slt i32 [[I_US]], [[N]]
+; CHECK-NEXT: br i1 [[CMP_US]], label [[FOR_BODY_US:%.*]], label [[FOR_COND_CLEANUP_SPLIT_US_SPLIT:%.*]]
+; CHECK: for.body.us:
+; CHECK-NEXT: br label [[TMP4:%.*]]
+; CHECK: 4:
+; CHECK-NEXT: br label [[TMP5:%.*]]
+; CHECK: 5:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US:%.*]] = phi i32 [ [[I_US]], [[TMP4]] ]
+; CHECK-NEXT: br label [[TMP6]]
+; CHECK: 6:
+; CHECK-NEXT: [[ADD_US]] = add nuw nsw i32 24, [[RES_US]]
+; CHECK-NEXT: [[INC_US]] = add nuw nsw i32 [[I_US]], 1
+; CHECK-NEXT: br label [[FOR_COND_US]]
+; CHECK: for.cond.cleanup.split.us.split:
+; CHECK-NEXT: [[RES_LCSSA_US:%.*]] = phi i32 [ [[RES_US]], [[FOR_COND_US]] ]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP_SPLIT_US]]
+; CHECK: for.cond.cleanup.split.us:
+; CHECK-NEXT: [[DOTUS_PHI12:%.*]] = phi i32 [ [[RES_LCSSA_US]], [[FOR_COND_CLEANUP_SPLIT_US_SPLIT]] ], [ [[RES_LCSSA_US_US]], [[FOR_COND_CLEANUP_SPLIT_US_SPLIT_US]] ]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP:%.*]]
+; CHECK: entry.split:
+; CHECK-NEXT: [[COND2_FR:%.*]] = freeze i1 [[COND2]]
+; CHECK-NEXT: br i1 [[COND2_FR]], label [[ENTRY_SPLIT_SPLIT_US:%.*]], label [[ENTRY_SPLIT_SPLIT:%.*]]
+; CHECK: entry.split.split.us:
+; CHECK-NEXT: br label [[FOR_COND_US1:%.*]]
+; CHECK: for.cond.us1:
+; CHECK-NEXT: [[RES_US2:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_SPLIT_US]] ], [ [[ADD_US7:%.*]], [[TMP9:%.*]] ]
+; CHECK-NEXT: [[I_US3:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_SPLIT_US]] ], [ [[INC_US8:%.*]], [[TMP9]] ]
+; CHECK-NEXT: [[CMP_US4:%.*]] = icmp slt i32 [[I_US3]], [[N]]
+; CHECK-NEXT: br i1 [[CMP_US4]], label [[FOR_BODY_US5:%.*]], label [[FOR_COND_CLEANUP_SPLIT_SPLIT_US:%.*]]
+; CHECK: for.body.us5:
+; CHECK-NEXT: br label [[TMP7:%.*]]
+; CHECK: 7:
+; CHECK-NEXT: br label [[TMP8:%.*]]
+; CHECK: 8:
+; CHECK-NEXT: br label [[TMP9]]
+; CHECK: 9:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US6:%.*]] = phi i32 [ 42, [[TMP8]] ]
+; CHECK-NEXT: [[ADD_US7]] = add nuw nsw i32 [[UNSWITCHED_SELECT_US6]], [[RES_US2]]
+; CHECK-NEXT: [[INC_US8]] = add nuw nsw i32 [[I_US3]], 1
+; CHECK-NEXT: br label [[FOR_COND_US1]]
+; CHECK: for.cond.cleanup.split.split.us:
+; CHECK-NEXT: [[RES_LCSSA_US9:%.*]] = phi i32 [ [[RES_US2]], [[FOR_COND_US1]] ]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP_SPLIT:%.*]]
+; CHECK: entry.split.split:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
-; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ADD:%.*]], [[FOR_BODY:%.*]] ]
-; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[INC:%.*]], [[FOR_BODY]] ]
+; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_SPLIT]] ], [ [[ADD:%.*]], [[TMP11:%.*]] ]
+; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_SPLIT]] ], [ [[INC:%.*]], [[TMP11]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
-; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_COND_CLEANUP:%.*]]
+; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[FOR_COND_CLEANUP_SPLIT_SPLIT:%.*]]
; CHECK: for.body:
-; CHECK-NEXT: [[SELECT1:%.*]] = select i1 [[COND]], i32 [[I]], i32 42
-; CHECK-NEXT: [[SELECT2:%.*]] = select i1 [[COND2]], i32 [[SELECT1]], i32 24
-; CHECK-NEXT: [[ADD]] = add nuw nsw i32 [[SELECT2]], [[RES]]
+; CHECK-NEXT: br label [[TMP10:%.*]]
+; CHECK: 10:
+; CHECK-NEXT: br label [[TMP11]]
+; CHECK: 11:
+; CHECK-NEXT: [[ADD]] = add nuw nsw i32 24, [[RES]]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I]], 1
; CHECK-NEXT: br label [[FOR_COND]]
-; CHECK: for.cond.cleanup:
+; CHECK: for.cond.cleanup.split.split:
; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi i32 [ [[RES]], [[FOR_COND]] ]
-; CHECK-NEXT: ret i32 [[RES_LCSSA]]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP_SPLIT]]
+; CHECK: for.cond.cleanup.split:
+; CHECK-NEXT: [[DOTUS_PHI10:%.*]] = phi i32 [ [[RES_LCSSA]], [[FOR_COND_CLEANUP_SPLIT_SPLIT]] ], [ [[RES_LCSSA_US9]], [[FOR_COND_CLEANUP_SPLIT_SPLIT_US]] ]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP]]
+; CHECK: for.cond.cleanup:
+; CHECK-NEXT: [[DOTUS_PHI:%.*]] = phi i32 [ [[DOTUS_PHI10]], [[FOR_COND_CLEANUP_SPLIT]] ], [ [[DOTUS_PHI12]], [[FOR_COND_CLEANUP_SPLIT_US]] ]
+; CHECK-NEXT: ret i32 [[DOTUS_PHI]]
;
entry:
br label %for.cond
@@ -204,27 +367,60 @@ define i32 @select_in_if(i32 %N, i1 %cond) {
; CHECK-LABEL: define i32 @select_in_if
; CHECK-SAME: (i32 [[N:%.*]], i1 [[COND:%.*]]) {
; CHECK-NEXT: entry:
+; CHECK-NEXT: [[COND_FR:%.*]] = freeze i1 [[COND]]
+; CHECK-NEXT: br i1 [[COND_FR]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
+; CHECK: entry.split.us:
+; CHECK-NEXT: br label [[FOR_COND_US:%.*]]
+; CHECK: for.cond.us:
+; CHECK-NEXT: [[RES_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[ADD_US:%.*]], [[FOR_BODY_END_US:%.*]] ]
+; CHECK-NEXT: [[I_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[INC_US:%.*]], [[FOR_BODY_END_US]] ]
+; CHECK-NEXT: [[CMP_US:%.*]] = icmp slt i32 [[I_US]], [[N]]
+; CHECK-NEXT: br i1 [[CMP_US]], label [[FOR_BODY_US:%.*]], label [[FOR_COND_CLEANUP_SPLIT_US:%.*]]
+; CHECK: for.body.us:
+; CHECK-NEXT: [[UREM_US:%.*]] = urem i32 [[I_US]], 2
+; CHECK-NEXT: [[IF_COND_US:%.*]] = icmp eq i32 [[UREM_US]], 0
+; CHECK-NEXT: br i1 [[IF_COND_US]], label [[FOR_BODY_IF_US:%.*]], label [[FOR_BODY_END_US]]
+; CHECK: for.body.if.us:
+; CHECK-NEXT: br label [[TMP0:%.*]]
+; CHECK: for.body.end.us:
+; CHECK-NEXT: [[P_US:%.*]] = phi i32 [ [[UNSWITCHED_SELECT_US:%.*]], [[TMP1:%.*]] ], [ 24, [[FOR_BODY_US]] ]
+; CHECK-NEXT: [[ADD_US]] = add nuw nsw i32 [[P_US]], [[RES_US]]
+; CHECK-NEXT: [[INC_US]] = add nuw nsw i32 [[I_US]], 1
+; CHECK-NEXT: br label [[FOR_COND_US]]
+; CHECK: 0:
+; CHECK-NEXT: br label [[TMP1]]
+; CHECK: 1:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US]] = phi i32 [ [[I_US]], [[TMP0]] ]
+; CHECK-NEXT: br label [[FOR_BODY_END_US]]
+; CHECK: for.cond.cleanup.split.us:
+; CHECK-NEXT: [[RES_LCSSA_US:%.*]] = phi i32 [ [[RES_US]], [[FOR_COND_US]] ]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP:%.*]]
+; CHECK: entry.split:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
-; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ADD:%.*]], [[FOR_BODY_END:%.*]] ]
-; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[INC:%.*]], [[FOR_BODY_END]] ]
+; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[ADD:%.*]], [[FOR_BODY_END:%.*]] ]
+; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[INC:%.*]], [[FOR_BODY_END]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
-; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[FOR_COND_CLEANUP:%.*]]
+; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[FOR_COND_CLEANUP_SPLIT:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[UREM:%.*]] = urem i32 [[I]], 2
; CHECK-NEXT: [[IF_COND:%.*]] = icmp eq i32 [[UREM]], 0
; CHECK-NEXT: br i1 [[IF_COND]], label [[FOR_BODY_IF:%.*]], label [[FOR_BODY_END]]
; CHECK: for.body.if:
-; CHECK-NEXT: [[COND1:%.*]] = select i1 [[COND]], i32 [[I]], i32 42
+; CHECK-NEXT: br label [[TMP2:%.*]]
+; CHECK: 2:
; CHECK-NEXT: br label [[FOR_BODY_END]]
; CHECK: for.body.end:
-; CHECK-NEXT: [[P:%.*]] = phi i32 [ [[COND1]], [[FOR_BODY_IF]] ], [ 24, [[FOR_BODY]] ]
+; CHECK-NEXT: [[P:%.*]] = phi i32 [ 42, [[TMP2]] ], [ 24, [[FOR_BODY]] ]
; CHECK-NEXT: [[ADD]] = add nuw nsw i32 [[P]], [[RES]]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I]], 1
; CHECK-NEXT: br label [[FOR_COND]]
-; CHECK: for.cond.cleanup:
+; CHECK: for.cond.cleanup.split:
; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi i32 [ [[RES]], [[FOR_COND]] ]
-; CHECK-NEXT: ret i32 [[RES_LCSSA]]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP]]
+; CHECK: for.cond.cleanup:
+; CHECK-NEXT: [[DOTUS_PHI:%.*]] = phi i32 [ [[RES_LCSSA]], [[FOR_COND_CLEANUP_SPLIT]] ], [ [[RES_LCSSA_US]], [[FOR_COND_CLEANUP_SPLIT_US]] ]
+; CHECK-NEXT: ret i32 [[DOTUS_PHI]]
;
entry:
br label %for.cond
@@ -258,30 +454,66 @@ define i32 @select_in_if_else(i32 %N, i1 %cond) {
; CHECK-LABEL: define i32 @select_in_if_else
; CHECK-SAME: (i32 [[N:%.*]], i1 [[COND:%.*]]) {
; CHECK-NEXT: entry:
+; CHECK-NEXT: [[COND_FR:%.*]] = freeze i1 [[COND]]
+; CHECK-NEXT: br i1 [[COND_FR]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
+; CHECK: entry.split.us:
+; CHECK-NEXT: br label [[FOR_COND_US:%.*]]
+; CHECK: for.cond.us:
+; CHECK-NEXT: [[RES_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[ADD_US:%.*]], [[FOR_BODY_END_US:%.*]] ]
+; CHECK-NEXT: [[I_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[INC_US:%.*]], [[FOR_BODY_END_US]] ]
+; CHECK-NEXT: [[CMP_US:%.*]] = icmp slt i32 [[I_US]], [[N]]
+; CHECK-NEXT: br i1 [[CMP_US]], label [[FOR_BODY_US:%.*]], label [[FOR_COND_CLEANUP_SPLIT_US:%.*]]
+; CHECK: for.body.us:
+; CHECK-NEXT: [[UREM_US:%.*]] = urem i32 [[I_US]], 2
+; CHECK-NEXT: [[IF_COND_US:%.*]] = icmp eq i32 [[UREM_US]], 0
+; CHECK-NEXT: br i1 [[IF_COND_US]], label [[FOR_BODY_IF_US:%.*]], label [[FOR_BODY_ELSE_US:%.*]]
+; CHECK: for.body.else.us:
+; CHECK-NEXT: br label [[TMP0:%.*]]
+; CHECK: for.body.if.us:
+; CHECK-NEXT: [[COND1A_US:%.*]] = select i1 true, i32 [[I_US]], i32 42
+; CHECK-NEXT: br label [[FOR_BODY_END_US]]
+; CHECK: for.body.end.us:
+; CHECK-NEXT: [[P_US:%.*]] = phi i32 [ [[COND1A_US]], [[FOR_BODY_IF_US]] ], [ [[UNSWITCHED_SELECT_US:%.*]], [[TMP1:%.*]] ]
+; CHECK-NEXT: [[ADD_US]] = add nuw nsw i32 [[P_US]], [[RES_US]]
+; CHECK-NEXT: [[INC_US]] = add nuw nsw i32 [[I_US]], 1
+; CHECK-NEXT: br label [[FOR_COND_US]]
+; CHECK: 0:
+; CHECK-NEXT: br label [[TMP1]]
+; CHECK: 1:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US]] = phi i32 [ 24, [[TMP0]] ]
+; CHECK-NEXT: br label [[FOR_BODY_END_US]]
+; CHECK: for.cond.cleanup.split.us:
+; CHECK-NEXT: [[RES_LCSSA_US:%.*]] = phi i32 [ [[RES_US]], [[FOR_COND_US]] ]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP:%.*]]
+; CHECK: entry.split:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
-; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ADD:%.*]], [[FOR_BODY_END:%.*]] ]
-; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[INC:%.*]], [[FOR_BODY_END]] ]
+; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[ADD:%.*]], [[FOR_BODY_END:%.*]] ]
+; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[INC:%.*]], [[FOR_BODY_END]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]]
-; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[FOR_COND_CLEANUP:%.*]]
+; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[FOR_COND_CLEANUP_SPLIT:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[UREM:%.*]] = urem i32 [[I]], 2
; CHECK-NEXT: [[IF_COND:%.*]] = icmp eq i32 [[UREM]], 0
; CHECK-NEXT: br i1 [[IF_COND]], label [[FOR_BODY_IF:%.*]], label [[FOR_BODY_ELSE:%.*]]
; CHECK: for.body.if:
-; CHECK-NEXT: [[COND1A:%.*]] = select i1 [[COND]], i32 [[I]], i32 42
+; CHECK-NEXT: [[COND1A:%.*]] = select i1 false, i32 [[I]], i32 42
; CHECK-NEXT: br label [[FOR_BODY_END]]
; CHECK: for.body.else:
-; CHECK-NEXT: [[COND1B:%.*]] = select i1 [[COND]], i32 24, i32 [[I]]
+; CHECK-NEXT: br label [[TMP2:%.*]]
+; CHECK: 2:
; CHECK-NEXT: br label [[FOR_BODY_END]]
; CHECK: for.body.end:
-; CHECK-NEXT: [[P:%.*]] = phi i32 [ [[COND1A]], [[FOR_BODY_IF]] ], [ [[COND1B]], [[FOR_BODY_ELSE]] ]
+; CHECK-NEXT: [[P:%.*]] = phi i32 [ [[COND1A]], [[FOR_BODY_IF]] ], [ [[I]], [[TMP2]] ]
; CHECK-NEXT: [[ADD]] = add nuw nsw i32 [[P]], [[RES]]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I]], 1
; CHECK-NEXT: br label [[FOR_COND]]
-; CHECK: for.cond.cleanup:
+; CHECK: for.cond.cleanup.split:
; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi i32 [ [[RES]], [[FOR_COND]] ]
-; CHECK-NEXT: ret i32 [[RES_LCSSA]]
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP]]
+; CHECK: for.cond.cleanup:
+; CHECK-NEXT: [[DOTUS_PHI:%.*]] = phi i32 [ [[RES_LCSSA]], [[FOR_COND_CLEANUP_SPLIT]] ], [ [[RES_LCSSA_US]], [[FOR_COND_CLEANUP_SPLIT_US]] ]
+; CHECK-NEXT: ret i32 [[DOTUS_PHI]]
;
entry:
br label %for.cond
@@ -324,21 +556,56 @@ define dso_local void @select_nested_loop(i1 noundef zeroext %cond, i32 noundef
; CHECK-NEXT: [[OR_COND:%.*]] = or i1 [[CMP17_NOT]], [[CMP215_NOT]]
; CHECK-NEXT: br i1 [[OR_COND]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_COND1_PREHEADER_US_PREHEADER:%.*]]
; CHECK: for.cond1.preheader.us.preheader:
+; CHECK-NEXT: br i1 [[COND]], label [[FOR_COND1_PREHEADER_US_PREHEADER_SPLIT_US:%.*]], label [[FOR_COND1_PREHEADER_US_PREHEADER_SPLIT:%.*]]
+; CHECK: for.cond1.preheader.us.preheader.split.us:
+; CHECK-NEXT: br label [[FOR_COND1_PREHEADER_US_US:%.*]]
+; CHECK: for.cond1.preheader.us.us:
+; CHECK-NEXT: [[I_018_US_US:%.*]] = phi i32 [ [[INC7_US_US:%.*]], [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US_US:%.*]] ], [ 0, [[FOR_COND1_PREHEADER_US_PREHEADER_SPLIT_US]] ]
+; CHECK-NEXT: br label [[FOR_COND1_PREHEADER_US_SPLIT_US_US:%.*]]
+; CHECK: for.cond1.for.cond.cleanup3_crit_edge.us.us:
+; CHECK-NEXT: [[INC7_US_US]] = add nuw i32 [[I_018_US_US]], 1
+; CHECK-NEXT: [[EXITCOND21_NOT_US:%.*]] = icmp eq i32 [[INC7_US_US]], [[N]]
+; CHECK-NEXT: br i1 [[EXITCOND21_NOT_US]], label [[FOR_COND_CLEANUP_LOOPEXIT_SPLIT_US:%.*]], label [[FOR_COND1_PREHEADER_US_US]]
+; CHECK: for.cond1.preheader.us.split.us.us:
+; CHECK-NEXT: br label [[FOR_BODY4_US_US_US:%.*]]
+; CHECK: for.body4.us.us.us:
+; CHECK-NEXT: [[J_016_US_US_US:%.*]] = phi i32 [ 0, [[FOR_COND1_PREHEADER_US_SPLIT_US_US]] ], [ [[INC_US_US_US:%.*]], [[TMP1:%.*]] ]
+; CHECK-NEXT: br label [[TMP0:%.*]]
+; CHECK: 0:
+; CHECK-NEXT: br label [[TMP1]]
+; CHECK: 1:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US_US:%.*]] = phi i32 [ [[I_018_US_US]], [[TMP0]] ]
+; CHECK-NEXT: tail call void @bar(i32 noundef [[UNSWITCHED_SELECT_US_US]])
+; CHECK-NEXT: [[INC_US_US_US]] = add nuw i32 [[J_016_US_US_US]], 1
+; CHECK-NEXT: [[EXITCOND_NOT_US_US:%.*]] = icmp eq i32 [[INC_US_US_US]], [[M]]
+; CHECK-NEXT: br i1 [[EXITCOND_NOT_US_US]], label [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US_SPLIT_US_US:%.*]], label [[FOR_BODY4_US_US_US]]
+; CHECK: for.cond1.for.cond.cleanup3_crit_edge.us.split.us.us:
+; CHECK-NEXT: br label [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US_US]]
+; CHECK: for.cond.cleanup.loopexit.split.us:
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP_LOOPEXIT:%.*]]
+; CHECK: for.cond1.preheader.us.preheader.split:
; CHECK-NEXT: br label [[FOR_COND1_PREHEADER_US:%.*]]
; CHECK: for.cond1.preheader.us:
-; CHECK-NEXT: [[I_018_US:%.*]] = phi i32 [ [[INC7_US:%.*]], [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US:%.*]] ], [ 0, [[FOR_COND1_PREHEADER_US_PREHEADER]] ]
+; CHECK-NEXT: [[I_018_US:%.*]] = phi i32 [ [[INC7_US:%.*]], [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US:%.*]] ], [ 0, [[FOR_COND1_PREHEADER_US_PREHEADER_SPLIT]] ]
+; CHECK-NEXT: br label [[FOR_COND1_PREHEADER_US_SPLIT:%.*]]
+; CHECK: for.cond1.preheader.us.split:
; CHECK-NEXT: br label [[FOR_BODY4_US:%.*]]
; CHECK: for.body4.us:
-; CHECK-NEXT: [[J_016_US:%.*]] = phi i32 [ 0, [[FOR_COND1_PREHEADER_US]] ], [ [[INC_US:%.*]], [[FOR_BODY4_US]] ]
-; CHECK-NEXT: [[COND5_US:%.*]] = select i1 [[COND]], i32 [[I_018_US]], i32 [[J_016_US]]
-; CHECK-NEXT: tail call void @bar(i32 noundef [[COND5_US]])
+; CHECK-NEXT: [[J_016_US:%.*]] = phi i32 [ 0, [[FOR_COND1_PREHEADER_US_SPLIT]] ], [ [[INC_US:%.*]], [[TMP2:%.*]] ]
+; CHECK-NEXT: br label [[TMP2]]
+; CHECK: 2:
+; CHECK-NEXT: tail call void @bar(i32 noundef [[J_016_US]])
; CHECK-NEXT: [[INC_US]] = add nuw i32 [[J_016_US]], 1
; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i32 [[INC_US]], [[M]]
-; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US]], label [[FOR_BODY4_US]]
+; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US_SPLIT:%.*]], label [[FOR_BODY4_US]]
+; CHECK: for.cond1.for.cond.cleanup3_crit_edge.us.split:
+; CHECK-NEXT: br label [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US]]
; CHECK: for.cond1.for.cond.cleanup3_crit_edge.us:
; CHECK-NEXT: [[INC7_US]] = add nuw i32 [[I_018_US]], 1
; CHECK-NEXT: [[EXITCOND21_NOT:%.*]] = icmp eq i32 [[INC7_US]], [[N]]
-; CHECK-NEXT: br i1 [[EXITCOND21_NOT]], label [[FOR_COND_CLEANUP_LOOPEXIT:%.*]], label [[FOR_COND1_PREHEADER_US]]
+; CHECK-NEXT: br i1 [[EXITCOND21_NOT]], label [[FOR_COND_CLEANUP_LOOPEXIT_SPLIT:%.*]], label [[FOR_COND1_PREHEADER_US]]
+; CHECK: for.cond.cleanup.loopexit.split:
+; CHECK-NEXT: br label [[FOR_COND_CLEANUP_LOOPEXIT]]
; CHECK: for.cond.cleanup.loopexit:
; CHECK-NEXT: br label [[FOR_COND_CLEANUP]]
; CHECK: for.cond.cleanup:
@@ -385,14 +652,35 @@ define dso_local void @select_invariant_outer_loop(i1 noundef zeroext %cond, i32
; CHECK-NEXT: [[I_021_US:%.*]] = phi i32 [ [[INC9_US:%.*]], [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US:%.*]] ], [ 0, [[FOR_COND1_PREHEADER_US_PREHEADER]] ]
; CHECK-NEXT: [[REM_US:%.*]] = and i32 [[I_021_US]], 1
; CHECK-NEXT: [[CMP5_US:%.*]] = icmp eq i32 [[REM_US]], 0
+; CHECK-NEXT: [[CMP5_US_FR:%.*]] = freeze i1 [[CMP5_US]]
+; CHECK-NEXT: br i1 [[CMP5_US_FR]], label [[FOR_COND1_PREHEADER_US_SPLIT_US:%.*]], label [[FOR_COND1_PREHEADER_US_SPLIT:%.*]]
+; CHECK: for.cond1.preheader.us.split.us:
+; CHECK-NEXT: br label [[FOR_BODY4_US_US:%.*]]
+; CHECK: for.body4.us.us:
+; CHECK-NEXT: [[J_019_US_US:%.*]] = phi i32 [ 0, [[FOR_COND1_PREHEADER_US_SPLIT_US]] ], [ [[INC_US_US:%.*]], [[TMP1:%.*]] ]
+; CHECK-NEXT: br label [[TMP0:%.*]]
+; CHECK: 0:
+; CHECK-NEXT: br label [[TMP1]]
+; CHECK: 1:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US:%.*]] = phi i32 [ [[I_021_US]], [[TMP0]] ]
+; CHECK-NEXT: tail call void @bar(i32 noundef [[UNSWITCHED_SELECT_US]])
+; CHECK-NEXT: [[INC_US_US]] = add nuw i32 [[J_019_US_US]], 1
+; CHECK-NEXT: [[EXITCOND_NOT_US:%.*]] = icmp eq i32 [[INC_US_US]], [[M]]
+; CHECK-NEXT: br i1 [[EXITCOND_NOT_US]], label [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US_SPLIT_US:%.*]], label [[FOR_BODY4_US_US]]
+; CHECK: for.cond1.for.cond.cleanup3_crit_edge.us.split.us:
+; CHECK-NEXT: br label [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US]]
+; CHECK: for.cond1.preheader.us.split:
; CHECK-NEXT: br label [[FOR_BODY4_US:%.*]]
; CHECK: for.body4.us:
-; CHECK-NEXT: [[J_019_US:%.*]] = phi i32 [ 0, [[FOR_COND1_PREHEADER_US]] ], [ [[INC_US:%.*]], [[FOR_BODY4_US]] ]
-; CHECK-NEXT: [[COND7_US:%.*]] = select i1 [[CMP5_US]], i32 [[I_021_US]], i32 [[J_019_US]]
-; CHECK-NEXT: tail call void @bar(i32 noundef [[COND7_US]])
+; CHECK-NEXT: [[J_019_US:%.*]] = phi i32 [ 0, [[FOR_COND1_PREHEADER_US_SPLIT]] ], [ [[INC_US:%.*]], [[TMP2:%.*]] ]
+; CHECK-NEXT: br label [[TMP2]]
+; CHECK: 2:
+; CHECK-NEXT: tail call void @bar(i32 noundef [[J_019_US]])
; CHECK-NEXT: [[INC_US]] = add nuw i32 [[J_019_US]], 1
; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i32 [[INC_US]], [[M]]
-; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US]], label [[FOR_BODY4_US]]
+; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US_SPLIT:%.*]], label [[FOR_BODY4_US]]
+; CHECK: for.cond1.for.cond.cleanup3_crit_edge.us.split:
+; CHECK-NEXT: br label [[FOR_COND1_FOR_COND_CLEANUP3_CRIT_EDGE_US]]
; CHECK: for.cond1.for.cond.cleanup3_crit_edge.us:
; CHECK-NEXT: [[INC9_US]] = add nuw i32 [[I_021_US]], 1
; CHECK-NEXT: [[EXITCOND24_NOT:%.*]] = icmp eq i32 [[INC9_US]], [[N]]
diff --git a/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-trivial-select.ll b/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-trivial-select.ll
index 5280aa7d3e284..a75c60dfd27fb 100644
--- a/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-trivial-select.ll
+++ b/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-trivial-select.ll
@@ -88,21 +88,34 @@ define i32 @unswitch_trivial_select_cmp_outside(i32 %x) {
; CHECK-LABEL: @unswitch_trivial_select_cmp_outside(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[C:%.*]] = icmp ult i32 [[X:%.*]], 100
-; CHECK-NEXT: br i1 [[C]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
+; CHECK-NEXT: [[C_FR:%.*]] = freeze i1 [[C]]
+; CHECK-NEXT: br i1 [[C_FR]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
; CHECK: entry.split.us:
; CHECK-NEXT: br label [[LOOP_US:%.*]]
; CHECK: loop.us:
-; CHECK-NEXT: [[P_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ 35, [[LOOP_US]] ]
-; CHECK-NEXT: br label [[LOOP_US]]
+; CHECK-NEXT: [[P_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ 35, [[TMP1:%.*]] ]
+; CHECK-NEXT: br label [[TMP0:%.*]]
+; CHECK: 0:
+; CHECK-NEXT: br label [[TMP1]]
+; CHECK: 1:
+; CHECK-NEXT: [[UNSWITCHED_SELECT_US:%.*]] = phi i1 [ true, [[TMP0]] ]
+; CHECK-NEXT: br i1 [[UNSWITCHED_SELECT_US]], label [[LOOP_US]], label [[EXIT_SPLIT_US:%.*]]
+; CHECK: exit.split.us:
+; CHECK-NEXT: [[LCSSA_US:%.*]] = phi i32 [ [[P_US]], [[TMP1]] ]
+; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: entry.split:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
-; CHECK-NEXT: [[P:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ]
-; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 false, i1 true, i1 false
-; CHECK-NEXT: br label [[EXIT:%.*]]
+; CHECK-NEXT: [[P:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ 35, [[TMP2:%.*]] ]
+; CHECK-NEXT: br label [[TMP2]]
+; CHECK: 2:
+; CHECK-NEXT: br i1 false, label [[LOOP]], label [[EXIT_SPLIT:%.*]]
+; CHECK: exit.split:
+; CHECK-NEXT: [[LCSSA:%.*]] = phi i32 [ [[P]], [[TMP2]] ]
+; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
-; CHECK-NEXT: [[LCSSA:%.*]] = phi i32 [ [[P]], [[LOOP]] ]
-; CHECK-NEXT: ret i32 [[LCSSA]]
+; CHECK-NEXT: [[DOTUS_PHI:%.*]] = phi i32 [ [[LCSSA]], [[EXIT_SPLIT]] ], [ [[LCSSA_US]], [[EXIT_SPLIT_US]] ]
+; CHECK-NEXT: ret i32 [[DOTUS_PHI]]
;
entry:
%c = icmp ult i32 %x, 100
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