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[VPlan] Fix crash caused by not updating all users properly.

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Users of VPValues are managed in a vector, so we need to be more
careful when iterating over users while updating them. For now, just
copy them.

Fixes 51798.

(cherry picked from commit 368af7558e55039e4e93c3eed68ce00da86e5e35)
This commit is contained in:
Florian Hahn 2021-09-12 17:53:40 +01:00 committed by Tom Stellard
parent 7b93a88a1e
commit fca643847d
2 changed files with 71 additions and 2 deletions
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7
lib/Transforms/Vectorize/VPlanTransforms.cpp
View File

@ -234,12 +234,15 @@ bool VPlanTransforms::mergeReplicateRegions(VPlan &Plan) {
for (VPRecipeBase &Phi1ToMove : make_early_inc_range(reverse(*Merge1))) {
VPValue *PredInst1 =
cast<VPPredInstPHIRecipe>(&Phi1ToMove)->getOperand(0);
for (VPUser *U : Phi1ToMove.getVPSingleValue()->users()) {
VPValue *Phi1ToMoveV = Phi1ToMove.getVPSingleValue();
SmallVector<VPUser *> Users(Phi1ToMoveV->user_begin(),
Phi1ToMoveV->user_end());
for (VPUser *U : Users) {
auto *UI = dyn_cast<VPRecipeBase>(U);
if (!UI || UI->getParent() != Then2)
continue;
for (unsigned I = 0, E = U->getNumOperands(); I != E; ++I) {
if (Phi1ToMove.getVPSingleValue() != U->getOperand(I))
if (Phi1ToMoveV != U->getOperand(I))
continue;
U->setOperand(I, PredInst1);
}

66
test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge.ll
View File

@ -836,3 +836,69 @@ loop:
exit:
ret void
}
define void @update_multiple_users(i16* noalias %src, i8* noalias %dst, i1 %c) {
; CHECK-LABEL: LV: Checking a loop in "update_multiple_users"
; CHECK: VPlan 'Initial VPlan for VF={2},UF>=1' {
; CHECK-NEXT: loop.header:
; CHECK-NEXT: WIDEN-INDUCTION %iv = phi 0, %iv.next
; CHECK-NEXT: Successor(s): loop.then
; CHECK-EMPTY:
; CHECK-NEXT: loop.then:
; CHECK-NEXT: Successor(s): loop.then.0
; CHECK-EMPTY:
; CHECK-NEXT: loop.then.0:
; CHECK-NEXT: Successor(s): pred.store
; CHECK-EMPTY:
; CHECK-NEXT: <xVFxUF> pred.store: {
; CHECK-NEXT: pred.store.entry:
; CHECK-NEXT: BRANCH-ON-MASK ir<%c>
; CHECK-NEXT: Successor(s): pred.store.if, pred.store.continue
; CHECK-NEXT: CondBit: ir<%c>
; CHECK-EMPTY:
; CHECK-NEXT: pred.store.if:
; CHECK-NEXT: REPLICATE ir<%l1> = load ir<%src>
; CHECK-NEXT: REPLICATE ir<%cmp> = icmp ir<%l1>, ir<0>
; CHECK-NEXT: REPLICATE ir<%l2> = trunc ir<%l1>
; CHECK-NEXT: REPLICATE ir<%sel> = select ir<%cmp>, ir<5>, ir<%l2>
; CHECK-NEXT: REPLICATE store ir<%sel>, ir<%dst>
; CHECK-NEXT: Successor(s): pred.store.continue
; CHECK-EMPTY:
; CHECK-NEXT: pred.store.continue:
; CHECK-NEXT: PHI-PREDICATED-INSTRUCTION vp<%6> = ir<%l1>
; CHECK-NEXT: No successors
; CHECK-NEXT: }
; CHECK-NEXT: Successor(s): loop.then.1
; CHECK-EMPTY:
; CHECK-NEXT: loop.then.1:
; CHECK-NEXT: WIDEN ir<%sext.l1> = sext vp<%6>
; CHECK-NEXT: Successor(s): loop.latch
; CHECK-EMPTY:
; CHECK-NEXT: loop.latch:
; CHECK-NEXT: No successors
; CHECK-NEXT: }
;
entry:
br label %loop.header
loop.header:
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
br i1 %c, label %loop.then, label %loop.latch
loop.then:
%l1 = load i16, i16* %src, align 2
%l2 = trunc i16 %l1 to i8
%cmp = icmp eq i16 %l1, 0
%sel = select i1 %cmp, i8 5, i8 %l2
store i8 %sel, i8* %dst, align 1
%sext.l1 = sext i16 %l1 to i32
br label %loop.latch
loop.latch:
%iv.next = add nsw i64 %iv, 1
%ec = icmp eq i64 %iv.next, 999
br i1 %ec, label %exit, label %loop.header
exit:
ret void
}