const SmallDenseMap<BasicBlock *, BasicBlock *, 16> &DominatingSucc,
ValueToValueMapTy &VMap,
SmallVectorImpl<DominatorTree::UpdateType> &DTUpdates, AssumptionCache &AC,
- DominatorTree &DT, LoopInfo &LI, MemorySSAUpdater *MSSAU) {
+ DominatorTree &DT, LoopInfo &LI, MemorySSAUpdater *MSSAU,
+ ScalarEvolution *SE) {
SmallVector<BasicBlock *, 4> NewBlocks;
NewBlocks.reserve(L.getNumBlocks() + ExitBlocks.size());
// We should have a value map between the instruction and its clone.
assert(VMap.lookup(&I) == &ClonedI && "Mismatch in the value map!");
+ // Forget SCEVs based on exit phis in case SCEV looked through the phi.
+ if (SE && isa<PHINode>(I))
+ SE->forgetValue(&I);
+
auto *MergePN =
PHINode::Create(I.getType(), /*NumReservedValues*/ 2, ".us-phi",
&*MergeBB->getFirstInsertionPt());
VMaps.emplace_back(new ValueToValueMapTy());
ClonedPHs[SuccBB] = buildClonedLoopBlocks(
L, LoopPH, SplitBB, ExitBlocks, ParentBB, SuccBB, RetainedSuccBB,
- DominatingSucc, *VMaps.back(), DTUpdates, AC, DT, LI, MSSAU);
+ DominatingSucc, *VMaps.back(), DTUpdates, AC, DT, LI, MSSAU, SE);
}
// Drop metadata if we may break its semantics by moving this instr into the
--- /dev/null
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -passes="loop-mssa(loop-deletion,simple-loop-unswitch<nontrivial;trivial>),loop(indvars)" -verify-scev -S %s | FileCheck %s
+
+define void @pr58868(i1 %c.1, ptr %src, ptr %dst) {
+; CHECK-LABEL: @pr58868(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: br i1 [[C_1:%.*]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
+; CHECK: entry.split.us:
+; CHECK-NEXT: br label [[OUTER_HEADER_US:%.*]]
+; CHECK: outer.header.us:
+; CHECK-NEXT: br label [[OUTER_BB1_US:%.*]]
+; CHECK: outer.bb1.us:
+; CHECK-NEXT: br label [[OUTER_BB2_US:%.*]]
+; CHECK: outer.bb2.us:
+; CHECK-NEXT: [[LV_US:%.*]] = load i16, ptr [[SRC:%.*]], align 1
+; CHECK-NEXT: br i1 true, label [[OUTER_HEADER_LOOPEXIT_US:%.*]], label [[OUTER_BB2_SPLIT_SPLIT_US:%.*]]
+; CHECK: outer.header.loopexit.us:
+; CHECK-NEXT: br label [[OUTER_HEADER_US]]
+; CHECK: outer.bb2.split.split.us:
+; CHECK-NEXT: [[LV_LCSSA_US:%.*]] = phi i16 [ [[LV_US]], [[OUTER_BB2_US]] ]
+; CHECK-NEXT: br label [[OUTER_BB2_SPLIT:%.*]]
+; CHECK: entry.split:
+; CHECK-NEXT: br label [[OUTER_HEADER:%.*]]
+; CHECK: outer.header.loopexit:
+; CHECK-NEXT: unreachable
+; CHECK: outer.header:
+; CHECK-NEXT: br label [[OUTER_BB2:%.*]]
+; CHECK: outer.bb2:
+; CHECK-NEXT: [[LV:%.*]] = load i16, ptr [[SRC]], align 1
+; CHECK-NEXT: br i1 false, label [[OUTER_HEADER_LOOPEXIT:%.*]], label [[OUTER_BB2_SPLIT_SPLIT:%.*]]
+; CHECK: outer.bb2.split.split:
+; CHECK-NEXT: [[LV_LCSSA:%.*]] = phi i16 [ [[LV]], [[OUTER_BB2]] ]
+; CHECK-NEXT: br label [[OUTER_BB2_SPLIT]]
+; CHECK: outer.bb2.split:
+; CHECK-NEXT: [[DOTUS_PHI:%.*]] = phi i16 [ [[LV_LCSSA]], [[OUTER_BB2_SPLIT_SPLIT]] ], [ [[LV_LCSSA_US]], [[OUTER_BB2_SPLIT_SPLIT_US]] ]
+; CHECK-NEXT: br label [[INNER_HEADER:%.*]]
+; CHECK: inner.header:
+; CHECK-NEXT: [[IV:%.*]] = phi i16 [ [[DOTUS_PHI]], [[OUTER_BB2_SPLIT]] ], [ [[IV_NEXT:%.*]], [[INNER_LATCH:%.*]] ]
+; CHECK-NEXT: br label [[INNER_LATCH]]
+; CHECK: inner.latch:
+; CHECK-NEXT: [[IV_NEXT]] = add nsw i16 [[IV]], 1
+; CHECK-NEXT: store i16 0, ptr [[DST:%.*]], align 1
+; CHECK-NEXT: [[C_2:%.*]] = icmp ne i16 [[IV]], 0
+; CHECK-NEXT: br i1 [[C_2]], label [[INNER_HEADER]], label [[EXIT:%.*]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ br label %outer.header
+
+outer.header:
+ br i1 %c.1, label %outer.bb1, label %outer.bb2
+
+outer.bb1:
+ br label %outer.bb2
+
+outer.bb2:
+ %lv = load i16, ptr %src, align 1
+ br label %inner.header
+
+inner.header:
+ %iv = phi i16 [ %lv, %outer.bb2 ], [ %iv.next, %inner.latch ]
+ br i1 %c.1, label %outer.header, label %inner.latch
+
+inner.latch:
+ %iv.next = add nsw i16 %iv, 1
+ store i16 0, ptr %dst, align 1
+ %c.2 = icmp ne i16 %iv, 0
+ br i1 %c.2, label %inner.header, label %exit
+
+exit:
+ ret void
+}