llvm/test/Transforms/LoopVersioning/add-phi-update-users.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt < %s -passes=loop-versioning -S -o - | FileCheck %s

; This test case used to end like this:
;
;    Instruction does not dominate all uses!
;      %t2 = load i16, ptr @b, align 1, !tbaa !2, !alias.scope !6
;      %tobool = icmp eq i16 %t2, 0
;    LLVM ERROR: Broken function found, compilation aborted!
;
; due to a fault where we did not replace the use of %t2 in the icmp in
; for.end, when adding a new PHI node for the versioned loops based on the
; loop-defined values used outside of the loop.
;
; Verify that the code compiles, that we get a versioned loop, and that the
; uses of %t2 in for.end and if.then are updated to use the value from the
; added phi node.

@a = dso_local global i16 0, align 1
@b = dso_local global i16 0, align 1
@c = dso_local global ptr null, align 1

define void @f1() {
; CHECK-LABEL: define void @f1() {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[T0:%.*]] = load ptr, ptr @c, align 1
; CHECK-NEXT:    [[SCEVGEP:%.*]] = getelementptr i8, ptr [[T0]], i64 2
; CHECK-NEXT:    br label %[[FOR_BODY_LVER_CHECK:.*]]
; CHECK:       [[FOR_BODY_LVER_CHECK]]:
; CHECK-NEXT:    [[BOUND0:%.*]] = icmp ult ptr [[T0]], getelementptr inbounds nuw (i8, ptr @b, i64 2)
; CHECK-NEXT:    [[BOUND1:%.*]] = icmp ult ptr @b, [[SCEVGEP]]
; CHECK-NEXT:    [[FOUND_CONFLICT:%.*]] = and i1 [[BOUND0]], [[BOUND1]]
; CHECK-NEXT:    br i1 [[FOUND_CONFLICT]], label %[[FOR_BODY_PH_LVER_ORIG:.*]], label %[[FOR_BODY_PH:.*]]
; CHECK:       [[FOR_BODY_PH_LVER_ORIG]]:
; CHECK-NEXT:    br label %[[FOR_BODY_LVER_ORIG:.*]]
; CHECK:       [[FOR_BODY_LVER_ORIG]]:
; CHECK-NEXT:    [[T1_LVER_ORIG:%.*]] = phi i64 [ 0, %[[FOR_BODY_PH_LVER_ORIG]] ], [ [[INC_LVER_ORIG:%.*]], %[[FOR_BODY_LVER_ORIG]] ]
; CHECK-NEXT:    [[T2_LVER_ORIG:%.*]] = load i16, ptr @b, align 1, !tbaa [[LONG_LONG_TBAA2:![0-9]+]]
; CHECK-NEXT:    store i16 [[T2_LVER_ORIG]], ptr [[T0]], align 1, !tbaa [[LONG_LONG_TBAA2]]
; CHECK-NEXT:    [[INC_LVER_ORIG]] = add nuw nsw i64 [[T1_LVER_ORIG]], 1
; CHECK-NEXT:    [[CMP_LVER_ORIG:%.*]] = icmp ult i64 [[INC_LVER_ORIG]], 3
; CHECK-NEXT:    br i1 [[CMP_LVER_ORIG]], label %[[FOR_BODY_LVER_ORIG]], label %[[FOR_END_LOOPEXIT:.*]]
; CHECK:       [[FOR_BODY_PH]]:
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    [[T1:%.*]] = phi i64 [ 0, %[[FOR_BODY_PH]] ], [ [[INC:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT:    [[T2:%.*]] = load i16, ptr @b, align 1, !tbaa [[LONG_LONG_TBAA2]], !alias.scope [[META6:![0-9]+]]
; CHECK-NEXT:    store i16 [[T2]], ptr [[T0]], align 1, !tbaa [[LONG_LONG_TBAA2]], !alias.scope [[META9:![0-9]+]], !noalias [[META6]]
; CHECK-NEXT:    [[INC]] = add nuw nsw i64 [[T1]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i64 [[INC]], 3
; CHECK-NEXT:    br i1 [[CMP]], label %[[FOR_BODY]], label %[[FOR_END_LOOPEXIT1:.*]]
; CHECK:       [[FOR_END_LOOPEXIT]]:
; CHECK-NEXT:    [[T2_LCSSA_PH:%.*]] = phi i16 [ [[T2_LVER_ORIG]], %[[FOR_BODY_LVER_ORIG]] ]
; CHECK-NEXT:    br label %[[FOR_END:.*]]
; CHECK:       [[FOR_END_LOOPEXIT1]]:
; CHECK-NEXT:    [[T2_LCSSA_PH2:%.*]] = phi i16 [ [[T2]], %[[FOR_BODY]] ]
; CHECK-NEXT:    br label %[[FOR_END]]
; CHECK:       [[FOR_END]]:
; CHECK-NEXT:    [[T2_LVER:%.*]] = phi i16 [ [[T2_LCSSA_PH]], %[[FOR_END_LOOPEXIT]] ], [ [[T2_LCSSA_PH2]], %[[FOR_END_LOOPEXIT1]] ]
; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp eq i16 [[T2_LVER]], 0
; CHECK-NEXT:    br i1 [[TOBOOL]], label %[[FOR_COND_BACKEDGE:.*]], label %[[IF_THEN:.*]]
; CHECK:       [[FOR_COND_BACKEDGE]]:
; CHECK-NEXT:    br label %[[FOR_BODY_LVER_CHECK]]
; CHECK:       [[IF_THEN]]:
; CHECK-NEXT:    store i16 [[T2_LVER]], ptr @a, align 1, !tbaa [[LONG_LONG_TBAA2]]
; CHECK-NEXT:    br label %[[FOR_COND_BACKEDGE]]
;
entry:
  %t0 = load ptr, ptr @c, align 1
  br label %for.cond

for.cond:                                         ; preds = %for.cond.backedge, %entry
  br label %for.body

for.body:                                         ; preds = %for.cond, %for.body
  %t1 = phi i64 [ 0, %for.cond ], [ %inc, %for.body ]
  %t2 = load i16, ptr @b, align 1, !tbaa !2
  store i16 %t2, ptr %t0, align 1, !tbaa !2
  %inc = add nuw nsw i64 %t1, 1
  %cmp = icmp ult i64 %inc, 3
  br i1 %cmp, label %for.body, label %for.end

for.end:                                          ; preds = %for.body
  %tobool = icmp eq i16 %t2, 0
  br i1 %tobool, label %for.cond.backedge, label %if.then

for.cond.backedge:                                ; preds = %for.end, %if.then
  br label %for.cond

if.then:                                          ; preds = %for.end
  store i16 %t2, ptr @a, align 1, !tbaa !2
  br label %for.cond.backedge
}

!llvm.module.flags = !{!0}
!llvm.ident = !{!1}

!0 = !{i32 1, !"wchar_size", i32 1}
!1 = !{!"clang version 7.0.0"}
!2 = !{!3, !3, i64 0}
!3 = !{!"long long", !4, i64 0}
!4 = !{!"omnipotent char", !5, i64 0}
!5 = !{!"Simple C/C++ TBAA"}
;.
; CHECK: [[LONG_LONG_TBAA2]] = !{[[META3:![0-9]+]], [[META3]], i64 0}
; CHECK: [[META3]] = !{!"long long", [[META4:![0-9]+]], i64 0}
; CHECK: [[META4]] = !{!"omnipotent char", [[META5:![0-9]+]], i64 0}
; CHECK: [[META5]] = !{!"Simple C/C++ TBAA"}
; CHECK: [[META6]] = !{[[META7:![0-9]+]]}
; CHECK: [[META7]] = distinct !{[[META7]], [[META8:![0-9]+]]}
; CHECK: [[META8]] = distinct !{[[META8]], i1 false, !"LVerDomain"}
; CHECK: [[META9]] = !{[[META10:![0-9]+]]}
; CHECK: [[META10]] = distinct !{[[META10]], [[META8]]}
;.