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[AliasSetTracker] Correct AAInfo check.

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Properly check if NewAAInfo conflicts with AAInfo.
Update local variable and alias set that a change occured when a conflict is found.
Resolves PR42969.

llvm-svn: 371139
This commit is contained in:
Alina Sbirlea 2019-09-05 23:00:36 +00:00
parent 9fd3523265
commit b1d8eeb720
2 changed files with 74 additions and 2 deletions
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5
include/llvm/Analysis/AliasSetTracker.h
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@ -87,10 +87,11 @@ class AliasSet : public ilist_node<AliasSet> {
AAInfo = NewAAInfo;
else {
AAMDNodes Intersection(AAInfo.intersect(NewAAInfo));
if (!Intersection) {
if (!Intersection.TBAA || !Intersection.Scope ||
!Intersection.NoAlias) {
// NewAAInfo conflicts with AAInfo.
AAInfo = DenseMapInfo<AAMDNodes>::getTombstoneKey();
return SizeChanged;
SizeChanged = true;
}
AAInfo = Intersection;
}

71
test/Transforms/LICM/pr42969.ll Normal file
View File

@ -0,0 +1,71 @@
; RUN: opt %s -S -scoped-noalias -enable-mssa-loop-dependency=true -licm -debug-only=licm | FileCheck %s
define i16 @main(i1 %a_b_mayalias, i16* %a, i16* %b) {
; CHECK-NOT: LICM: Promoting value stored to in loop
; CHECK: scalar.body:
; CHECK-NEXT: [[J:%.*]] = phi i64
; CHECK-NEXT: [[TMP3:%.*]] = load i16
; CHECK-NEXT: [[RESULT:%.*]] = add i16 [[TMP3]], 1
; CHECK-NEXT: store i16 [[RESULT]]
entry:
br label %outer
outer: ; preds = %scalar.cleanup, %entry
; 4 = MemoryPhi({entry,liveOnEntry},{scalar.cleanup,2})
%i = phi i16 [ 0, %entry ], [ %i.next, %scalar.cleanup ]
br i1 %a_b_mayalias, label %scalar.ph, label %vector.ph
vector.ph: ; preds = %outer
; MemoryUse(4) MayAlias
%tmp1 = load i16, i16* %a, align 1, !alias.scope !0, !tbaa !7
%tmp2 = add i16 %tmp1, 1
; 1 = MemoryDef(4)
store i16 %tmp2, i16* %b, align 1, !alias.scope !3, !noalias !0, !tbaa !7
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ %index.next, %vector.body ], [ 0, %vector.ph ]
%index.next = add i64 %index, 1
%cmp1 = icmp eq i64 %index.next, 16
br i1 %cmp1, label %middle.block, label %vector.body
middle.block: ; preds = %vector.body
br label %scalar.ph
scalar.ph: ; preds = %middle.block, %outer
; 5 = MemoryPhi({outer,4},{middle.block,1})
%j.start = phi i64 [ 0, %outer ], [ 16, %middle.block ]
br label %scalar.body
scalar.body: ; preds = %scalar.body, %scalar.ph
; 3 = MemoryPhi({scalar.ph,5},{scalar.body,2})
%j = phi i64 [ %j.next, %scalar.body ], [ %j.start, %scalar.ph ]
; MemoryUse(3) MayAlias
%tmp3 = load i16, i16* %a, align 1, !tbaa !7
%result = add i16 %tmp3, 1
; 2 = MemoryDef(3)
store i16 %result, i16* %b, align 1, !tbaa !7
%j.next = add nuw nsw i64 %j, 1
%cmp2 = icmp ult i64 %j.next, 20
br i1 %cmp2, label %scalar.body, label %scalar.cleanup
scalar.cleanup: ; preds = %scalar.body
%result.lcssa = phi i16 [ %result, %scalar.body ]
%i.next = add nuw nsw i16 %i, 1
%exitcond = icmp eq i16 %i.next, 10
br i1 %exitcond, label %exit.block, label %outer
exit.block: ; preds = %scalar.cleanup
%result.lcssa.lcssa = phi i16 [ %result.lcssa, %scalar.cleanup ]
ret i16 %result.lcssa.lcssa
}
!0 = !{!1}
!1 = distinct !{!1, !2}
!2 = distinct !{!2, !"LVerDomain"}
!3 = !{!4}
!4 = distinct !{!4, !2}
!5 = !{!"Simple C++ TBAA"}
!6 = !{!"omnipotent char", !5, i64 0}
!7 = !{!6, !6, i64 0}