llvm/test/Transforms/SimplifyCFG/pr165088.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -S -passes="simplifycfg<switch-range-to-icmp>" < %s | FileCheck %s

; Avoid getting stuck in the cycle pr165088_cycle_[1-4].

define void @pr165088_cycle_1(i8 %x) {
; CHECK-LABEL: define void @pr165088_cycle_1(
; CHECK-SAME: i8 [[X:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[TMP0:%.*]] = icmp ult i8 [[X]], 2
; CHECK-NEXT:    br i1 [[TMP0]], label %[[BLOCK2:.*]], label %[[BLOCK3:.*]]
; CHECK:       [[BLOCK1:.*]]:
; CHECK-NEXT:    [[COND2:%.*]] = icmp ugt i8 [[X]], 1
; CHECK-NEXT:    br i1 [[COND2]], label %[[BLOCK3]], label %[[BLOCK2]]
; CHECK:       [[BLOCK2]]:
; CHECK-NEXT:    br label %[[BLOCK3]]
; CHECK:       [[BLOCK3]]:
; CHECK-NEXT:    [[COND3:%.*]] = icmp eq i8 [[X]], 0
; CHECK-NEXT:    br i1 [[COND3]], label %[[EXIT:.*]], label %[[BLOCK1]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  %switch = icmp uge i8 %x, 2
  %cond1 = icmp ugt i8 %x, 1
  %or.cond = and i1 %switch, %cond1
  br i1 %or.cond, label %block3, label %block2

block1:
  %cond2 = icmp ugt i8 %x, 1
  br i1 %cond2, label %block3, label %block2

block2:
  br label %block3

block3:
  %cond3 = icmp eq i8 %x, 0
  br i1 %cond3, label %exit, label %block1

exit:
  ret void
}

define void @pr165088_cycle_2(i8 %x) {
; CHECK-LABEL: define void @pr165088_cycle_2(
; CHECK-SAME: i8 [[X:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[SWITCH:%.*]] = icmp ult i8 [[X]], 2
; CHECK-NEXT:    br i1 [[SWITCH]], label %[[BLOCK2:.*]], label %[[BLOCK3:.*]]
; CHECK:       [[BLOCK1:.*]]:
; CHECK-NEXT:    [[COND2:%.*]] = icmp ugt i8 [[X]], 1
; CHECK-NEXT:    br i1 [[COND2]], label %[[BLOCK3]], label %[[BLOCK2]]
; CHECK:       [[BLOCK2]]:
; CHECK-NEXT:    br label %[[BLOCK3]]
; CHECK:       [[BLOCK3]]:
; CHECK-NEXT:    [[COND3:%.*]] = icmp eq i8 [[X]], 0
; CHECK-NEXT:    br i1 [[COND3]], label %[[EXIT:.*]], label %[[BLOCK1]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  switch i8 %x, label %block3 [
  i8 1, label %block2
  i8 0, label %block2
  ]

block1:                                              ; preds = %block3
  %cond2 = icmp ugt i8 %x, 1
  br i1 %cond2, label %block3, label %block2

block2:                                              ; preds = %entry, %entry, %block1
  br label %block3

block3:                                              ; preds = %entry, %block2, %block1
  %cond3 = icmp eq i8 %x, 0
  br i1 %cond3, label %exit, label %block1

exit:                                             ; preds = %block3
  ret void
}

define void @pr165088_cycle_3(i8 %x) {
; CHECK-LABEL: define void @pr165088_cycle_3(
; CHECK-SAME: i8 [[X:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[BLOCK3:.*]]
; CHECK:       [[BLOCK3]]:
; CHECK-NEXT:    [[COND3:%.*]] = icmp eq i8 [[X]], 0
; CHECK-NEXT:    br i1 [[COND3]], label %[[EXIT:.*]], label %[[BLOCK3]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  switch i8 %x, label %block1 [
  i8 1, label %block2
  i8 0, label %block2
  ]

block1:                                              ; preds = %entry, %block3
  %cond2 = icmp ugt i8 %x, 1
  br i1 %cond2, label %block3, label %block2

block2:                                              ; preds = %entry, %entry, %block1
  br label %block3

block3:                                              ; preds = %block2, %block1
  %cond3 = icmp eq i8 %x, 0
  br i1 %cond3, label %exit, label %block1

exit:                                             ; preds = %block3
  ret void
}

define void @pr165088_cycle_4(i8 %x) {
; CHECK-LABEL: define void @pr165088_cycle_4(
; CHECK-SAME: i8 [[X:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[TMP0:%.*]] = icmp ult i8 [[X]], 2
; CHECK-NEXT:    br i1 [[TMP0]], label %[[BLOCK2:.*]], label %[[BLOCK3:.*]]
; CHECK:       [[BLOCK1:.*]]:
; CHECK-NEXT:    [[COND2_OLD:%.*]] = icmp ugt i8 [[X]], 1
; CHECK-NEXT:    br i1 [[COND2_OLD]], label %[[BLOCK3]], label %[[BLOCK2]]
; CHECK:       [[BLOCK2]]:
; CHECK-NEXT:    br label %[[BLOCK3]]
; CHECK:       [[BLOCK3]]:
; CHECK-NEXT:    [[COND3:%.*]] = icmp eq i8 [[X]], 0
; CHECK-NEXT:    br i1 [[COND3]], label %[[EXIT:.*]], label %[[BLOCK1]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  %switch = icmp ult i8 %x, 2
  br i1 %switch, label %block2, label %block1

block1:                                              ; preds = %entry, %block3
  %cond2 = icmp ugt i8 %x, 1
  br i1 %cond2, label %block3, label %block2

block2:                                              ; preds = %entry, %block1
  br label %block3

block3:                                              ; preds = %block2, %block1
  %cond3 = icmp eq i8 %x, 0
  br i1 %cond3, label %exit, label %block1

exit:                                             ; preds = %block3
  ret void
}

define void @pr165088_original(i8 %x) {
; CHECK-LABEL: define void @pr165088_original(
; CHECK-SAME: i8 [[X:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[TMP0:%.*]] = icmp ult i8 [[X]], 2
; CHECK-NEXT:    br i1 [[TMP0]], label %[[BLOCK2:.*]], label %[[BLOCK3:.*]]
; CHECK:       [[BLOCK1:.*]]:
; CHECK-NEXT:    [[COND3_OLD_OLD:%.*]] = icmp ugt i8 [[X]], 1
; CHECK-NEXT:    br i1 [[COND3_OLD_OLD]], label %[[BLOCK3]], label %[[BLOCK2]]
; CHECK:       [[BLOCK2]]:
; CHECK-NEXT:    br label %[[BLOCK3]]
; CHECK:       [[BLOCK3]]:
; CHECK-NEXT:    [[COND4:%.*]] = icmp eq i8 [[X]], 0
; CHECK-NEXT:    br i1 [[COND4]], label %[[EXIT:.*]], label %[[BLOCK1]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  %cond = icmp ne i8 %x, 0
  %cond3 = icmp ne i8 %x, 0
  %or.cond = and i1 %cond, %cond3
  br i1 %or.cond, label %block3, label %block2

block1:                                              ; preds = %block3
  %cond3.old = icmp ugt i8 %x, 1
  br i1 %cond3.old, label %block3, label %block2

block2:                                              ; preds = %block1, %entry
  br label %block3

block3:                                              ; preds = %block2, %block1, %entry
  %cond4 = icmp eq i8 %x, 0
  br i1 %cond4, label %exit, label %block1

exit:                                             ; preds = %block3
  ret void
}