llvm/test/Analysis/LoopAccessAnalysis/unsafe-and-rt-checks-convergent.ll

; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 5
; RUN: opt -passes='print<access-info>' -disable-output %s 2>&1 | FileCheck %s

; Analyze this loop:
;   for (i = 0; i < n; i++)
;    A[i + 1] = A[i] * B[i] * C[i];

; In this case, runtime checks are needed, and there is a convergent operation.
define void @rtchecks_needed(ptr %a, ptr %b, ptr %c) {
; CHECK-LABEL: 'rtchecks_needed'
; CHECK-NEXT:    for.body:
; CHECK-NEXT:      Has convergent operation in loop
; CHECK-NEXT:      Report: cannot add control dependency to convergent operation
; CHECK-NEXT:      Dependences:
; CHECK-NEXT:        Backward:
; CHECK-NEXT:            %loadA = load i16, ptr %arrayidxA, align 2 ->
; CHECK-NEXT:            store i16 %mul1, ptr %arrayidxA_plus_2, align 2
; CHECK-EMPTY:
; CHECK-NEXT:      Run-time memory checks:
; CHECK-NEXT:      Check 0:
; CHECK-NEXT:        Comparing group GRP0:
; CHECK-NEXT:          %arrayidxA = getelementptr inbounds i16, ptr %a, i64 %storemerge3
; CHECK-NEXT:          %arrayidxA_plus_2 = getelementptr inbounds i16, ptr %a, i64 %add
; CHECK-NEXT:        Against group GRP1:
; CHECK-NEXT:          %arrayidxB = getelementptr inbounds i16, ptr %b, i64 %storemerge3
; CHECK-NEXT:      Check 1:
; CHECK-NEXT:        Comparing group GRP0:
; CHECK-NEXT:          %arrayidxA = getelementptr inbounds i16, ptr %a, i64 %storemerge3
; CHECK-NEXT:          %arrayidxA_plus_2 = getelementptr inbounds i16, ptr %a, i64 %add
; CHECK-NEXT:        Against group GRP2:
; CHECK-NEXT:          %arrayidxC = getelementptr inbounds i16, ptr %c, i64 %storemerge3
; CHECK-NEXT:      Grouped accesses:
; CHECK-NEXT:        Group GRP0:
; CHECK-NEXT:          (Low: %a High: (42 + %a))
; CHECK-NEXT:            Member: {%a,+,2}<nuw><%for.body>
; CHECK-NEXT:            Member: {(2 + %a),+,2}<nw><%for.body>
; CHECK-NEXT:        Group GRP1:
; CHECK-NEXT:          (Low: %b High: (40 + %b))
; CHECK-NEXT:            Member: {%b,+,2}<nuw><%for.body>
; CHECK-NEXT:        Group GRP2:
; CHECK-NEXT:          (Low: %c High: (40 + %c))
; CHECK-NEXT:            Member: {%c,+,2}<nuw><%for.body>
; CHECK-EMPTY:
; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
; CHECK-NEXT:      SCEV assumptions:
; CHECK-EMPTY:
; CHECK-NEXT:      Expressions re-written:
;
entry:
  br label %for.body

for.body:                                         ; preds = %for.body, %entry
  %storemerge3 = phi i64 [ 0, %entry ], [ %add, %for.body ]

  %arrayidxA = getelementptr inbounds i16, ptr %a, i64 %storemerge3
  %loadA = load i16, ptr %arrayidxA, align 2

  %arrayidxB = getelementptr inbounds i16, ptr %b, i64 %storemerge3
  %loadB = load i16, ptr %arrayidxB, align 2

  %arrayidxC = getelementptr inbounds i16, ptr %c, i64 %storemerge3
  %loadC = load i16, ptr %arrayidxC, align 2

  call i16 @llvm.convergent(i16 %loadC)

  %mul = mul i16 %loadB, %loadA
  %mul1 = mul i16 %mul, %loadC

  %add = add nuw nsw i64 %storemerge3, 1
  %arrayidxA_plus_2 = getelementptr inbounds i16, ptr %a, i64 %add
  store i16 %mul1, ptr %arrayidxA_plus_2, align 2

  %exitcond = icmp eq i64 %add, 20
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.body
  ret void
}

; In this case, no runtime checks are needed, and there is a convergent operation.
define void @no_rtchecks(ptr noalias %a, ptr noalias %b, ptr noalias %c, ptr noalias %d, ptr noalias %e) {
; CHECK-LABEL: 'no_rtchecks'
; CHECK-NEXT:    for.body:
; CHECK-NEXT:      Has convergent operation in loop
; CHECK-NEXT:      Report: cannot add control dependency to convergent operation
; CHECK-NEXT:      Dependences:
; CHECK-NEXT:        Backward:
; CHECK-NEXT:            %loadA = load i16, ptr %arrayidxA, align 4 ->
; CHECK-NEXT:            store i16 %mulA, ptr %arrayidxA_plus_4, align 4
; CHECK-EMPTY:
; CHECK-NEXT:      Run-time memory checks:
; CHECK-NEXT:      Grouped accesses:
; CHECK-EMPTY:
; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
; CHECK-NEXT:      SCEV assumptions:
; CHECK-EMPTY:
; CHECK-NEXT:      Expressions re-written:
;
entry:
  br label %for.body

for.body:                                         ; preds = %for.body, %entry
  %ind = phi i64 [ 0, %entry ], [ %add, %for.body ]

  %arrayidxA = getelementptr inbounds i16, ptr %a, i64 %ind
  %loadA = load i16, ptr %arrayidxA, align 4

  %arrayidxB = getelementptr inbounds i16, ptr %b, i64 %ind
  %loadB = load i16, ptr %arrayidxB, align 4

  %mulA = mul i16 %loadB, %loadA

  %add = add nuw nsw i64 %ind, 1
  %arrayidxA_plus_4 = getelementptr inbounds i16, ptr %a, i64 %add
  store i16 %mulA, ptr %arrayidxA_plus_4, align 4

  %arrayidxD = getelementptr inbounds i16, ptr %d, i64 %ind
  %loadD = load i16, ptr %arrayidxD, align 4

  %arrayidxE = getelementptr inbounds i16, ptr %e, i64 %ind
  %loadE = load i16, ptr %arrayidxE, align 4

  %convergentD = call i16 @llvm.convergent(i16 %loadD)
  %mulC = mul i16 %convergentD, %loadE

  %arrayidxC = getelementptr inbounds i16, ptr %c, i64 %ind
  store i16 %mulC, ptr %arrayidxC, align 4

  %exitcond = icmp eq i64 %add, 20
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.body
  ret void
}

declare i16 @llvm.convergent(i16) #0

attributes #0 = { nounwind readnone convergent }