llvm/test/Transforms/SimplifyCFG/iterative-simplify.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
; PR1786

define i32 @main() {
; CHECK-LABEL: @main(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[RETVAL:%.*]] = alloca i32, align 4
; CHECK-NEXT:    [[I:%.*]] = alloca i32, align 4
; CHECK-NEXT:    [[Z:%.*]] = alloca i32, align 4
; CHECK-NEXT:    [[Z16:%.*]] = alloca i32, align 4
; CHECK-NEXT:    %"alloca point" = bitcast i32 0 to i32
; CHECK-NEXT:    store i32 0, i32* [[I]], align 4
; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp ne i8 1, 0
; CHECK-NEXT:    br i1 [[TOBOOL]], label [[COND_TRUE:%.*]], label [[COND_FALSE33:%.*]]
; CHECK:       cond_true:
; CHECK-NEXT:    store i32 0, i32* [[Z]], align 4
; CHECK-NEXT:    br label [[BB:%.*]]
; CHECK:       bb:
; CHECK-NEXT:    [[TMP:%.*]] = load i32, i32* [[Z]], align 4
; CHECK-NEXT:    [[TMP1:%.*]] = sub i32 [[TMP]], 16384
; CHECK-NEXT:    store i32 [[TMP1]], i32* [[Z]], align 4
; CHECK-NEXT:    [[TMP2:%.*]] = load i32, i32* [[I]], align 4
; CHECK-NEXT:    [[TMP3:%.*]] = add i32 [[TMP2]], 1
; CHECK-NEXT:    store i32 [[TMP3]], i32* [[I]], align 4
; CHECK-NEXT:    [[TMP4:%.*]] = load i32, i32* [[I]], align 4
; CHECK-NEXT:    [[TMP5:%.*]] = icmp sgt i32 [[TMP4]], 262144
; CHECK-NEXT:    [[TMP56:%.*]] = zext i1 [[TMP5]] to i8
; CHECK-NEXT:    [[TOBOOL7:%.*]] = icmp ne i8 [[TMP56]], 0
; CHECK-NEXT:    br i1 [[TOBOOL7]], label [[COND_TRUE8:%.*]], label [[COND_NEXT:%.*]]
; CHECK:       cond_true8:
; CHECK-NEXT:    call void @abort()
; CHECK-NEXT:    unreachable
; CHECK:       cond_next:
; CHECK-NEXT:    [[TMP9:%.*]] = load i32, i32* [[Z]], align 4
; CHECK-NEXT:    [[TMP10:%.*]] = icmp ne i32 [[TMP9]], 0
; CHECK-NEXT:    [[TMP1011:%.*]] = zext i1 [[TMP10]] to i8
; CHECK-NEXT:    [[TOBOOL12:%.*]] = icmp ne i8 [[TMP1011]], 0
; CHECK-NEXT:    br i1 [[TOBOOL12]], label [[BB]], label [[BB13:%.*]]
; CHECK:       bb13:
; CHECK-NEXT:    call void @exit(i32 0)
; CHECK-NEXT:    unreachable
; CHECK:       cond_false33:
; CHECK-NEXT:    call void @exit(i32 0)
; CHECK-NEXT:    unreachable
;
entry:
  %retval = alloca i32, align 4		; <i32*> [#uses=1]
  %i = alloca i32, align 4		; <i32*> [#uses=7]
  %z = alloca i32, align 4		; <i32*> [#uses=4]
  %z16 = alloca i32, align 4		; <i32*> [#uses=4]
  %"alloca point" = bitcast i32 0 to i32		; <i32> [#uses=0]
  store i32 0, i32* %i
  %toBool = icmp ne i8 1, 0		; <i1> [#uses=1]
  br i1 %toBool, label %cond_true, label %cond_false

cond_true:		; preds = %entry
  store i32 0, i32* %z
  br label %bb

bb:		; preds = %cond_next, %cond_true
  %tmp = load i32, i32* %z		; <i32> [#uses=1]
  %tmp1 = sub i32 %tmp, 16384		; <i32> [#uses=1]
  store i32 %tmp1, i32* %z
  %tmp2 = load i32, i32* %i		; <i32> [#uses=1]
  %tmp3 = add i32 %tmp2, 1		; <i32> [#uses=1]
  store i32 %tmp3, i32* %i
  %tmp4 = load i32, i32* %i		; <i32> [#uses=1]
  %tmp5 = icmp sgt i32 %tmp4, 262144		; <i1> [#uses=1]
  %tmp56 = zext i1 %tmp5 to i8		; <i8> [#uses=1]
  %toBool7 = icmp ne i8 %tmp56, 0		; <i1> [#uses=1]
  br i1 %toBool7, label %cond_true8, label %cond_next

cond_true8:		; preds = %bb
  call void @abort( )
  unreachable

cond_next:		; preds = %bb
  %tmp9 = load i32, i32* %z		; <i32> [#uses=1]
  %tmp10 = icmp ne i32 %tmp9, 0		; <i1> [#uses=1]
  %tmp1011 = zext i1 %tmp10 to i8		; <i8> [#uses=1]
  %toBool12 = icmp ne i8 %tmp1011, 0		; <i1> [#uses=1]
  br i1 %toBool12, label %bb, label %bb13

bb13:		; preds = %cond_next
  call void @exit( i32 0 )
  unreachable

cond_false:		; preds = %entry
  %toBool14 = icmp ne i8 1, 0		; <i1> [#uses=1]
  br i1 %toBool14, label %cond_true15, label %cond_false33

cond_true15:		; preds = %cond_false
  store i32 0, i32* %z16
  br label %bb17

bb17:		; preds = %cond_next27, %cond_true15
  %tmp18 = load i32, i32* %z16		; <i32> [#uses=1]
  %tmp19 = sub i32 %tmp18, 16384		; <i32> [#uses=1]
  store i32 %tmp19, i32* %z16
  %tmp20 = load i32, i32* %i		; <i32> [#uses=1]
  %tmp21 = add i32 %tmp20, 1		; <i32> [#uses=1]
  store i32 %tmp21, i32* %i
  %tmp22 = load i32, i32* %i		; <i32> [#uses=1]
  %tmp23 = icmp sgt i32 %tmp22, 262144		; <i1> [#uses=1]
  %tmp2324 = zext i1 %tmp23 to i8		; <i8> [#uses=1]
  %toBool25 = icmp ne i8 %tmp2324, 0		; <i1> [#uses=1]
  br i1 %toBool25, label %cond_true26, label %cond_next27

cond_true26:		; preds = %bb17
  call void @abort( )
  unreachable

cond_next27:		; preds = %bb17
  %tmp28 = load i32, i32* %z16		; <i32> [#uses=1]
  %tmp29 = icmp ne i32 %tmp28, 0		; <i1> [#uses=1]
  %tmp2930 = zext i1 %tmp29 to i8		; <i8> [#uses=1]
  %toBool31 = icmp ne i8 %tmp2930, 0		; <i1> [#uses=1]
  br i1 %toBool31, label %bb17, label %bb32

bb32:		; preds = %cond_next27
  call void @exit( i32 0 )
  unreachable

cond_false33:		; preds = %cond_false
  call void @exit( i32 0 )
  unreachable

cond_next34:		; No predecessors!
  br label %cond_next35

cond_next35:		; preds = %cond_next34
  br label %return

return:		; preds = %cond_next35
  %retval36 = load i32, i32* %retval		; <i32> [#uses=1]
  ret i32 %retval36
}

declare void @abort()

declare void @exit(i32)