llvm/test/Transforms/LoopUnroll/peel-to-turn-invariant-accesses-dereferenceable.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -loop-unroll -S %s | FileCheck %s

declare void @foo()

define i32 @peel_readonly_to_make_loads_derefenceable(i32* %ptr, i32 %N, i32* %inv, i1 %c.1) {
; CHECK-LABEL: @peel_readonly_to_make_loads_derefenceable(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER_PEEL_BEGIN:%.*]]
; CHECK:       loop.header.peel.begin:
; CHECK-NEXT:    br label [[LOOP_HEADER_PEEL:%.*]]
; CHECK:       loop.header.peel:
; CHECK-NEXT:    br i1 [[C_1:%.*]], label [[THEN_PEEL:%.*]], label [[UNREACHABLE_EXIT:%.*]]
; CHECK:       then.peel:
; CHECK-NEXT:    [[I_PEEL:%.*]] = load i32, i32* [[INV:%.*]], align 4
; CHECK-NEXT:    [[C_2_PEEL:%.*]] = icmp ult i32 [[I_PEEL]], 2
; CHECK-NEXT:    br i1 [[C_2_PEEL]], label [[LOOP_LATCH_PEEL:%.*]], label [[UNREACHABLE_EXIT]]
; CHECK:       loop.latch.peel:
; CHECK-NEXT:    [[GEP_PEEL:%.*]] = getelementptr i32, i32* [[PTR:%.*]], i32 1
; CHECK-NEXT:    [[LV_PEEL:%.*]] = load i32, i32* [[GEP_PEEL]], align 4
; CHECK-NEXT:    [[SUM_NEXT_PEEL:%.*]] = add i32 0, [[LV_PEEL]]
; CHECK-NEXT:    [[IV_NEXT_PEEL:%.*]] = add nuw nsw i32 1, 1
; CHECK-NEXT:    [[C_3_PEEL:%.*]] = icmp ult i32 1, 1000
; CHECK-NEXT:    br i1 [[C_3_PEEL]], label [[LOOP_HEADER_PEEL_NEXT:%.*]], label [[EXIT:%.*]]
; CHECK:       loop.header.peel.next:
; CHECK-NEXT:    br label [[LOOP_HEADER_PEEL_NEXT1:%.*]]
; CHECK:       loop.header.peel.next1:
; CHECK-NEXT:    br label [[ENTRY_PEEL_NEWPH:%.*]]
; CHECK:       entry.peel.newph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[IV_NEXT_PEEL]], [[ENTRY_PEEL_NEWPH]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ [[SUM_NEXT_PEEL]], [[ENTRY_PEEL_NEWPH]] ], [ [[SUM_NEXT:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[UNREACHABLE_EXIT_LOOPEXIT:%.*]]
; CHECK:       then:
; CHECK-NEXT:    [[I:%.*]] = load i32, i32* [[INV]], align 4
; CHECK-NEXT:    [[C_2:%.*]] = icmp ult i32 [[I]], 2
; CHECK-NEXT:    br i1 [[C_2]], label [[LOOP_LATCH]], label [[UNREACHABLE_EXIT_LOOPEXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, i32* [[PTR]], i32 [[IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, i32* [[GEP]], align 4
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[LV]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult i32 [[IV]], 1000
; CHECK-NEXT:    br i1 [[C_3]], label [[LOOP_HEADER]], label [[EXIT_LOOPEXIT:%.*]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA_PH:%.*]] = phi i32 [ [[SUM_NEXT]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT_PEEL]], [[LOOP_LATCH_PEEL]] ], [ [[SUM_NEXT_LCSSA_PH]], [[EXIT_LOOPEXIT]] ]
; CHECK-NEXT:    ret i32 [[SUM_NEXT_LCSSA]]
; CHECK:       unreachable.exit.loopexit:
; CHECK-NEXT:    br label [[UNREACHABLE_EXIT]]
; CHECK:       unreachable.exit:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    unreachable
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i32 [ 1, %entry ], [ %iv.next, %loop.latch ]
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %loop.latch ]
  br i1 %c.1, label %then, label %unreachable.exit

then:
  %i = load i32, i32* %inv
  %c.2 = icmp ult i32 %i, 2
  br i1 %c.2, label %loop.latch, label %unreachable.exit

loop.latch:
  %gep = getelementptr i32, i32* %ptr, i32 %iv
  %lv = load i32, i32* %gep
  %sum.next = add i32 %sum, %lv
  %iv.next = add nuw nsw i32  %iv, 1
  %c.3 = icmp ult i32 %iv, 1000
  br i1 %c.3, label %loop.header, label %exit

exit:
  ret i32 %sum.next

unreachable.exit:
  call void @foo()
  unreachable
}

define i32 @peel_readonly_to_make_loads_derefenceable_exits_lead_to_unreachable(i32* %ptr, i32 %N, i32* %inv, i1 %c.1) {
; CHECK-LABEL: @peel_readonly_to_make_loads_derefenceable_exits_lead_to_unreachable(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SUM_NEXT:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    br i1 [[C_1:%.*]], label [[THEN:%.*]], label [[EXIT_2:%.*]]
; CHECK:       then:
; CHECK-NEXT:    [[I:%.*]] = load i32, i32* [[INV:%.*]], align 4
; CHECK-NEXT:    [[C_2:%.*]] = icmp ult i32 [[I]], 2
; CHECK-NEXT:    br i1 [[C_2]], label [[THEN_2:%.*]], label [[EXIT_2]]
; CHECK:       then.2:
; CHECK-NEXT:    [[C_4:%.*]] = icmp ult i32 [[I]], 4
; CHECK-NEXT:    br i1 [[C_4]], label [[LOOP_LATCH]], label [[EXIT_3:%.*]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, i32* [[PTR:%.*]], i32 [[IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, i32* [[GEP]], align 4
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[LV]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult i32 [[IV]], 1000
; CHECK-NEXT:    br i1 [[C_3]], label [[LOOP_HEADER]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    ret i32 [[SUM_NEXT_LCSSA]]
; CHECK:       exit.2:
; CHECK-NEXT:    br label [[UNREACHABLE_BB:%.*]]
; CHECK:       exit.3:
; CHECK-NEXT:    br label [[UNREACHABLE_BB]]
; CHECK:       unreachable.bb:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    unreachable
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i32 [ 1, %entry ], [ %iv.next, %loop.latch ]
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %loop.latch ]
  br i1 %c.1, label %then, label %exit.2

then:
  %i = load i32, i32* %inv
  %c.2 = icmp ult i32 %i, 2
  br i1 %c.2, label %then.2, label %exit.2

then.2:
  %c.4 = icmp ult i32 %i, 4
  br i1 %c.4, label %loop.latch, label %exit.3

loop.latch:
  %gep = getelementptr i32, i32* %ptr, i32 %iv
  %lv = load i32, i32* %gep
  %sum.next = add i32 %sum, %lv
  %iv.next = add nuw nsw i32  %iv, 1
  %c.3 = icmp ult i32 %iv, 1000
  br i1 %c.3, label %loop.header, label %exit

exit:
  ret i32 %sum.next

exit.2:
  br label %unreachable.bb

exit.3:
  br label %unreachable.bb

unreachable.bb:
  call void @foo()
  unreachable
}

define i32 @do_not_peel_readonly_load_in_header(i32* %ptr, i32 %N, i32* %inv, i1 %c.1) {
; CHECK-LABEL: @do_not_peel_readonly_load_in_header(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SUM_NEXT:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    [[I:%.*]] = load i32, i32* [[INV:%.*]], align 4
; CHECK-NEXT:    [[C_2:%.*]] = icmp ult i32 [[I]], 2
; CHECK-NEXT:    br i1 [[C_2]], label [[THEN:%.*]], label [[UNREACHABLE_EXIT:%.*]]
; CHECK:       then:
; CHECK-NEXT:    br i1 [[C_1:%.*]], label [[LOOP_LATCH]], label [[UNREACHABLE_EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, i32* [[PTR:%.*]], i32 [[IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, i32* [[GEP]], align 4
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[LV]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult i32 [[IV]], 1000
; CHECK-NEXT:    br i1 [[C_3]], label [[LOOP_HEADER]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    ret i32 [[SUM_NEXT_LCSSA]]
; CHECK:       unreachable.exit:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    unreachable
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i32 [ 1, %entry ], [ %iv.next, %loop.latch ]
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %loop.latch ]
  %i = load i32, i32* %inv
  %c.2 = icmp ult i32 %i, 2
  br i1 %c.2, label %then, label %unreachable.exit

then:
  br i1 %c.1, label %loop.latch, label %unreachable.exit

loop.latch:
  %gep = getelementptr i32, i32* %ptr, i32 %iv
  %lv = load i32, i32* %gep
  %sum.next = add i32 %sum, %lv
  %iv.next = add nuw nsw i32  %iv, 1
  %c.3 = icmp ult i32 %iv, 1000
  br i1 %c.3, label %loop.header, label %exit

exit:
  ret i32 %sum.next

unreachable.exit:
  call void @foo()
  unreachable
}

define i32 @do_not_peel_readonly_but_wont_turn_dereferenceable(i32* %ptr, i32 %N, i32 %x, i32* %inv) {
; CHECK-LABEL: @do_not_peel_readonly_but_wont_turn_dereferenceable(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SUM_NEXT:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    [[C_1:%.*]] = icmp eq i32 [[IV]], [[X:%.*]]
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[ELSE:%.*]]
; CHECK:       then:
; CHECK-NEXT:    [[I:%.*]] = load i32, i32* [[INV:%.*]], align 4
; CHECK-NEXT:    [[C_2:%.*]] = icmp eq i32 [[I]], 20
; CHECK-NEXT:    br i1 [[C_2]], label [[UNREACHABLE_EXIT:%.*]], label [[LOOP_LATCH]]
; CHECK:       else:
; CHECK-NEXT:    br label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[P:%.*]] = phi i32 [ [[I]], [[THEN]] ], [ 0, [[ELSE]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, i32* [[PTR:%.*]], i32 [[IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, i32* [[GEP]], align 4
; CHECK-NEXT:    [[ADD_1:%.*]] = add i32 [[LV]], [[P]]
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[ADD_1]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult i32 [[IV]], 1000
; CHECK-NEXT:    br i1 [[C_3]], label [[LOOP_HEADER]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    ret i32 [[SUM_NEXT_LCSSA]]
; CHECK:       unreachable.exit:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    unreachable
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i32 [ 1, %entry ], [ %iv.next, %loop.latch ]
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %loop.latch ]
  %c.1 = icmp eq i32 %iv, %x
  br i1 %c.1, label %then, label %else

then:
  %i = load i32, i32* %inv
  %c.2 = icmp eq i32 %i, 20
  br i1 %c.2, label %unreachable.exit, label %loop.latch

else:
  br label %loop.latch

loop.latch:
  %p = phi i32 [ %i, %then ], [ 0, %else ]
  %gep = getelementptr i32, i32* %ptr, i32 %iv
  %lv = load i32, i32* %gep
  %add.1 = add i32 %lv, %p
  %sum.next = add i32 %sum, %add.1
  %iv.next = add nuw nsw i32  %iv, 1
  %c.3 = icmp ult i32 %iv, 1000
  br i1 %c.3, label %loop.header, label %exit

exit:
  ret i32 %sum.next

unreachable.exit:
  call void @foo()
  unreachable
}

define i32 @do_not_peel_write1(i32* %ptr, i32 %N, i32 %x, i32* %inv, i32* %dst, i1 %c.1) {
; CHECK-LABEL: @do_not_peel_write1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SUM_NEXT:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    br i1 [[C_1:%.*]], label [[THEN:%.*]], label [[UNREACHABLE_EXIT:%.*]]
; CHECK:       then:
; CHECK-NEXT:    [[I:%.*]] = load i32, i32* [[INV:%.*]], align 4
; CHECK-NEXT:    [[C_2:%.*]] = icmp ult i32 [[I]], 2
; CHECK-NEXT:    br i1 [[C_2]], label [[LOOP_LATCH]], label [[UNREACHABLE_EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, i32* [[PTR:%.*]], i32 [[IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, i32* [[GEP]], align 4
; CHECK-NEXT:    store i32 [[LV]], i32* [[DST:%.*]], align 4
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[LV]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult i32 [[IV]], 1000
; CHECK-NEXT:    br i1 [[C_3]], label [[LOOP_HEADER]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    ret i32 [[SUM_NEXT_LCSSA]]
; CHECK:       unreachable.exit:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    unreachable
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i32 [ 1, %entry ], [ %iv.next, %loop.latch ]
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %loop.latch ]
  br i1 %c.1, label %then, label %unreachable.exit

then:
  %i = load i32, i32* %inv
  %c.2 = icmp ult i32 %i, 2
  br i1 %c.2, label %loop.latch, label %unreachable.exit

loop.latch:
  %gep = getelementptr i32, i32* %ptr, i32 %iv
  %lv = load i32, i32* %gep
  store i32 %lv, i32* %dst
  %sum.next = add i32 %sum, %lv
  %iv.next = add nuw nsw i32  %iv, 1
  %c.3 = icmp ult i32 %iv, 1000
  br i1 %c.3, label %loop.header, label %exit

exit:
  ret i32 %sum.next

unreachable.exit:
  call void @foo()
  unreachable
}

define i32 @do_not_peel_write2(i32* %ptr, i32 %N, i32* %inv, i32* %dst) {
; CHECK-LABEL: @do_not_peel_write2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SUM_NEXT:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    [[I:%.*]] = load i32, i32* [[INV:%.*]], align 4
; CHECK-NEXT:    [[C_1:%.*]] = icmp eq i32 [[I]], 20
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[ELSE:%.*]]
; CHECK:       then:
; CHECK-NEXT:    store i32 [[I]], i32* [[DST:%.*]], align 4
; CHECK-NEXT:    br label [[LOOP_LATCH]]
; CHECK:       else:
; CHECK-NEXT:    br label [[UNREACHABLE_EXIT:%.*]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, i32* [[PTR:%.*]], i32 [[IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, i32* [[GEP]], align 4
; CHECK-NEXT:    [[ADD_1:%.*]] = add i32 [[LV]], [[I]]
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[ADD_1]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult i32 [[IV]], 1000
; CHECK-NEXT:    br i1 [[C_3]], label [[LOOP_HEADER]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    ret i32 [[SUM_NEXT_LCSSA]]
; CHECK:       unreachable.exit:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    unreachable
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i32 [ 1, %entry ], [ %iv.next, %loop.latch ]
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %loop.latch ]
  %i = load i32, i32* %inv
  %c.1 = icmp eq i32 %i, 20
  br i1 %c.1, label %then, label %else

then:
  store i32 %i, i32* %dst
  br label %loop.latch

else:
  br label %unreachable.exit

loop.latch:
  %gep = getelementptr i32, i32* %ptr, i32 %iv
  %lv = load i32, i32* %gep
  %add.1 = add i32 %lv, %i
  %sum.next = add i32 %sum, %add.1
  %iv.next = add nuw nsw i32  %iv, 1
  %c.3 = icmp ult i32 %iv, 1000
  br i1 %c.3, label %loop.header, label %exit

exit:
  ret i32 %sum.next

unreachable.exit:
  call void @foo()
  unreachable
}

declare i32 @llvm.experimental.deoptimize.i32(...)

define i32 @peel_with_deopt_exit(i32* %ptr, i32 %N, i32* %inv, i1 %c.1) {
; CHECK-LABEL: @peel_with_deopt_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SUM_NEXT:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    br i1 [[C_1:%.*]], label [[THEN:%.*]], label [[DEOPT_EXIT:%.*]]
; CHECK:       then:
; CHECK-NEXT:    [[I:%.*]] = load i32, i32* [[INV:%.*]], align 4
; CHECK-NEXT:    [[C_2:%.*]] = icmp ult i32 [[I]], 2
; CHECK-NEXT:    br i1 [[C_2]], label [[LOOP_LATCH]], label [[DEOPT_EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, i32* [[PTR:%.*]], i32 [[IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, i32* [[GEP]], align 4
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[LV]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult i32 [[IV]], 1000
; CHECK-NEXT:    br i1 [[C_3]], label [[LOOP_HEADER]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    ret i32 [[SUM_NEXT_LCSSA]]
; CHECK:       deopt.exit:
; CHECK-NEXT:    [[SUM_LCSSA:%.*]] = phi i32 [ [[SUM]], [[THEN]] ], [ [[SUM]], [[LOOP_HEADER]] ]
; CHECK-NEXT:    [[RVAL:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[SUM_LCSSA]]) ]
; CHECK-NEXT:    ret i32 [[RVAL]]
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i32 [ 1, %entry ], [ %iv.next, %loop.latch ]
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %loop.latch ]
  br i1 %c.1, label %then, label %deopt.exit

then:
  %i = load i32, i32* %inv
  %c.2 = icmp ult i32 %i, 2
  br i1 %c.2, label %loop.latch, label %deopt.exit

loop.latch:
  %gep = getelementptr i32, i32* %ptr, i32 %iv
  %lv = load i32, i32* %gep
  %sum.next = add i32 %sum, %lv
  %iv.next = add nuw nsw i32  %iv, 1
  %c.3 = icmp ult i32 %iv, 1000
  br i1 %c.3, label %loop.header, label %exit

exit:
  ret i32 %sum.next

deopt.exit:
  %rval = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %sum) ]
  ret i32 %rval
}

define i32 @do_not_peel_when_header_exiting(i32* %ptr, i32 %N, i32* %inv) {
; CHECK-LABEL: @do_not_peel_when_header_exiting(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SUM_NEXT:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    [[C_1:%.*]] = icmp ult i32 [[IV]], 1000
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[EXIT:%.*]]
; CHECK:       then:
; CHECK-NEXT:    [[I:%.*]] = load i32, i32* [[INV:%.*]], align 4
; CHECK-NEXT:    [[C_2:%.*]] = icmp ult i32 [[I]], 2
; CHECK-NEXT:    br i1 [[C_2]], label [[LOOP_LATCH]], label [[UNREACHABLE_EXIT:%.*]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, i32* [[PTR:%.*]], i32 [[IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, i32* [[GEP]], align 4
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[LV]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    [[SUM_LCSSA:%.*]] = phi i32 [ [[SUM]], [[LOOP_HEADER]] ]
; CHECK-NEXT:    ret i32 [[SUM_LCSSA]]
; CHECK:       unreachable.exit:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    unreachable
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i32 [ 1, %entry ], [ %iv.next, %loop.latch ]
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %loop.latch ]
  %c.1 = icmp ult i32 %iv, 1000
  br i1 %c.1, label %then, label %exit

then:
  %i = load i32, i32* %inv
  %c.2 = icmp ult i32 %i, 2
  br i1 %c.2, label %loop.latch, label %unreachable.exit

loop.latch:
  %gep = getelementptr i32, i32* %ptr, i32 %iv
  %lv = load i32, i32* %gep
  %sum.next = add i32 %sum, %lv
  %iv.next = add nuw nsw i32  %iv, 1
  br label %loop.header

exit:
  ret i32 %sum

unreachable.exit:
  call void @foo()
  unreachable
}

define i32 @do_not_peel_readonly_to_make_loads_derefenceable_but_does_not_control_exit(i32* %ptr, i32 %N, i32* %inv, i1 %c.1, i32 %N.2) {
; CHECK-LABEL: @do_not_peel_readonly_to_make_loads_derefenceable_but_does_not_control_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SUM_NEXT:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    br i1 [[C_1:%.*]], label [[THEN:%.*]], label [[UNREACHABLE_EXIT:%.*]]
; CHECK:       then:
; CHECK-NEXT:    [[I:%.*]] = load i32, i32* [[INV:%.*]], align 4
; CHECK-NEXT:    [[C_2:%.*]] = icmp ult i32 [[IV]], [[N_2:%.*]]
; CHECK-NEXT:    br i1 [[C_2]], label [[LOOP_LATCH]], label [[UNREACHABLE_EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, i32* [[PTR:%.*]], i32 [[IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, i32* [[GEP]], align 4
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[LV]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult i32 [[IV]], 1000
; CHECK-NEXT:    br i1 [[C_3]], label [[LOOP_HEADER]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    ret i32 [[SUM_NEXT_LCSSA]]
; CHECK:       unreachable.exit:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    unreachable
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i32 [ 1, %entry ], [ %iv.next, %loop.latch ]
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %loop.latch ]
  br i1 %c.1, label %then, label %unreachable.exit

then:
  %i = load i32, i32* %inv
  %c.2 = icmp ult i32 %iv, %N.2
  br i1 %c.2, label %loop.latch, label %unreachable.exit

loop.latch:
  %gep = getelementptr i32, i32* %ptr, i32 %iv
  %lv = load i32, i32* %gep
  %sum.next = add i32 %sum, %lv
  %iv.next = add nuw nsw i32  %iv, 1
  %c.3 = icmp ult i32 %iv, 1000
  br i1 %c.3, label %loop.header, label %exit

exit:
  ret i32 %sum.next

unreachable.exit:
  call void @foo()
  unreachable
}

@glob = global i32 10

define i32 @do_not_peel_readonly_but_already_deref_glob(i32* %ptr, i32 %N, i1 %c.1) {
; CHECK-LABEL: @do_not_peel_readonly_but_already_deref_glob(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SUM_NEXT:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    br i1 [[C_1:%.*]], label [[THEN:%.*]], label [[UNREACHABLE_EXIT:%.*]]
; CHECK:       then:
; CHECK-NEXT:    [[I:%.*]] = load i32, i32* @glob, align 4
; CHECK-NEXT:    [[C_2:%.*]] = icmp ult i32 [[I]], 2
; CHECK-NEXT:    br i1 [[C_2]], label [[LOOP_LATCH]], label [[UNREACHABLE_EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, i32* [[PTR:%.*]], i32 [[IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, i32* [[GEP]], align 4
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[LV]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult i32 [[IV]], 1000
; CHECK-NEXT:    br i1 [[C_3]], label [[LOOP_HEADER]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    ret i32 [[SUM_NEXT_LCSSA]]
; CHECK:       unreachable.exit:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    unreachable
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i32 [ 1, %entry ], [ %iv.next, %loop.latch ]
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %loop.latch ]
  br i1 %c.1, label %then, label %unreachable.exit

then:
  %i = load i32, i32* @glob
  %c.2 = icmp ult i32 %i, 2
  br i1 %c.2, label %loop.latch, label %unreachable.exit

loop.latch:
  %gep = getelementptr i32, i32* %ptr, i32 %iv
  %lv = load i32, i32* %gep
  %sum.next = add i32 %sum, %lv
  %iv.next = add nuw nsw i32  %iv, 1
  %c.3 = icmp ult i32 %iv, 1000
  br i1 %c.3, label %loop.header, label %exit

exit:
  ret i32 %sum.next

unreachable.exit:
  call void @foo()
  unreachable
}