llvm/test/Transforms/LoopDistribute/pointer-phi-in-loop.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -aa-pipeline=basic-aa -passes='loop-distribute' -enable-loop-distribute -S %s | FileCheck %s

; Testcases inspired by PR50296, PR50288.

define void @phi_load_store_distribute(i1 %c, i16* %A, i16* %B, i16* %C) {
; CHECK-LABEL: @phi_load_store_distribute(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[IV:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[IF_END:%.*]] ]
; CHECK-NEXT:    [[LV:%.*]] = load i16, i16* [[A:%.*]], align 1
; CHECK-NEXT:    store i16 [[LV]], i16* [[A]], align 1
; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF_THEN:%.*]], label [[IF_END]]
; CHECK:       if.then:
; CHECK-NEXT:    [[LV2:%.*]] = load i16, i16* [[A]], align 1
; CHECK-NEXT:    br label [[IF_END]]
; CHECK:       if.end:
; CHECK-NEXT:    [[C_SINK:%.*]] = phi i16* [ [[B:%.*]], [[IF_THEN]] ], [ [[C:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[LV3:%.*]] = load i16, i16* [[C_SINK]], align 2
; CHECK-NEXT:    [[ADD:%.*]] = add i16 [[LV3]], 10
; CHECK-NEXT:    store i16 [[ADD]], i16* [[C_SINK]], align 1
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i16 [[IV]], 1
; CHECK-NEXT:    [[TOBOOL_NOT:%.*]] = icmp eq i16 [[IV_NEXT]], 1000
; CHECK-NEXT:    br i1 [[TOBOOL_NOT]], label [[FOR_END_LOOPEXIT:%.*]], label [[FOR_BODY]]
; CHECK:       for.end.loopexit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:                                         ; preds = %if.end, %entry
  %iv = phi i16 [ 0, %entry ], [ %iv.next, %if.end ]
  %lv = load i16, i16* %A, align 1
  store i16 %lv, i16* %A, align 1
  br i1 %c, label %if.then, label %if.end

if.then:                                          ; preds = %for.body
  %lv2 = load i16, i16* %A, align 1
  br label %if.end

if.end:                                           ; preds = %if.then, %for.body
  %c.sink = phi i16* [ %B, %if.then ], [ %C, %for.body ]
  %lv3 = load i16, i16* %c.sink
  %add = add i16 %lv3, 10
  store i16 %add, i16* %c.sink, align 1
  %iv.next = add nuw nsw i16 %iv, 1
  %tobool.not = icmp eq i16 %iv.next, 1000
  br i1 %tobool.not, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %if.end
  ret void
}

define void @phi_load_distribute(i1 %c, i16* %A, i16* %B, i16* %C) {
; CHECK-LABEL: @phi_load_distribute(
; CHECK-NEXT:  entry:
; CHECK:       for.end.loopexit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:                                         ; preds = %if.end, %entry
  %iv = phi i16 [ 0, %entry ], [ %iv.next, %if.end ]
  %lv = load i16, i16* %A, align 1
  store i16 %lv, i16* %A, align 1
  br i1 %c, label %if.then, label %if.end

if.then:                                          ; preds = %for.body
  %lv2 = load i16, i16* %A, align 1
  br label %if.end

if.end:                                           ; preds = %if.then, %for.body
  %c.sink = phi i16* [ %B, %if.then ], [ %C, %for.body ]
  %lv3 = load i16, i16* %c.sink
  %iv.next = add nuw nsw i16 %iv, 1
  %tobool.not = icmp eq i16 %iv.next, 1000
  br i1 %tobool.not, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %if.end
  ret void
}