; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -sink-common-insts -S | FileCheck %s -check-prefix=SIMPLIFY-CFG

define i8 @test_duplicate_preds_merging(i8 %v1, i8 %v2) {
; SIMPLIFY-CFG-LABEL: @test_duplicate_preds_merging(
; SIMPLIFY-CFG-NEXT:  entry:
; SIMPLIFY-CFG-NEXT:    switch i8 [[V1:%.*]], label [[EXIT:%.*]] [
; SIMPLIFY-CFG-NEXT:      i8 0, label [[THEN:%.*]]
; SIMPLIFY-CFG-NEXT:      i8 1, label [[ELSE:%.*]]
; SIMPLIFY-CFG-NEXT:    ]
; SIMPLIFY-CFG:       then:
; SIMPLIFY-CFG-NEXT:    switch i8 [[V2:%.*]], label [[EXIT]] [
; SIMPLIFY-CFG-NEXT:      i8 0, label [[ELSE]]
; SIMPLIFY-CFG-NEXT:      i8 1, label [[SWITCH_CASE_1:%.*]]
; SIMPLIFY-CFG-NEXT:      i8 2, label [[SWITCH_CASE_1]]
; SIMPLIFY-CFG-NEXT:    ]
; SIMPLIFY-CFG:       switch.case.1:
; SIMPLIFY-CFG-NEXT:    br label [[EXIT]]
; SIMPLIFY-CFG:       else:
; SIMPLIFY-CFG-NEXT:    br label [[EXIT]]
; SIMPLIFY-CFG:       exit:
; SIMPLIFY-CFG-NEXT:    [[RET:%.*]] = phi i8 [ 0, [[ELSE]] ], [ 2, [[THEN]] ], [ 1, [[SWITCH_CASE_1]] ], [ 3, [[ENTRY:%.*]] ]
; SIMPLIFY-CFG-NEXT:    ret i8 [[RET]]
;
entry:
  switch i8 %v1, label %exit [
  i8 0, label %then
  i8 1, label %else
  ]

then:                                             ; preds = %entry
  switch i8 %v2, label %exit [
  i8 0, label %switch.case.0
  i8 1, label %switch.case.1
  i8 2, label %switch.case.2
  ]

switch.case.0:                                    ; preds = %then
  br label %exit

switch.case.1:                                    ; preds = %then
  br label %exit

switch.case.2:                                    ; preds = %then
  br label %exit

else:                                             ; preds = %entry
  br label %exit

exit:                                             ; preds = %else, %switch.case.2, %switch.case.1, %switch.case.0, %then, %entry
  %ret = phi i8 [ 0, %else ], [ 0, %switch.case.0 ], [ 1, %switch.case.1 ], [ 1, %switch.case.2 ], [ 2, %then ], [ 3, %entry ]
  ret i8 %ret
}

define i8 @test_no_merge_address_taken(i8 %v1, i8 %v2, ptr %p) {
; SIMPLIFY-CFG-LABEL: @test_no_merge_address_taken(
; SIMPLIFY-CFG-NEXT:  entry:
; SIMPLIFY-CFG-NEXT:    store ptr blockaddress(@test_no_merge_address_taken, [[SWITCH_CASE_0:%.*]]), ptr [[P:%.*]], align 8
; SIMPLIFY-CFG-NEXT:    switch i8 [[V1:%.*]], label [[EXIT:%.*]] [
; SIMPLIFY-CFG-NEXT:      i8 0, label [[THEN:%.*]]
; SIMPLIFY-CFG-NEXT:      i8 1, label [[ELSE:%.*]]
; SIMPLIFY-CFG-NEXT:    ]
; SIMPLIFY-CFG:       then:
; SIMPLIFY-CFG-NEXT:    switch i8 [[V2:%.*]], label [[EXIT]] [
; SIMPLIFY-CFG-NEXT:      i8 0, label [[SWITCH_CASE_0]]
; SIMPLIFY-CFG-NEXT:      i8 1, label [[SWITCH_CASE_1:%.*]]
; SIMPLIFY-CFG-NEXT:      i8 2, label [[SWITCH_CASE_1]]
; SIMPLIFY-CFG-NEXT:    ]
; SIMPLIFY-CFG:       switch.case.0:
; SIMPLIFY-CFG-NEXT:    br label [[EXIT]]
; SIMPLIFY-CFG:       switch.case.1:
; SIMPLIFY-CFG-NEXT:    br label [[EXIT]]
; SIMPLIFY-CFG:       else:
; SIMPLIFY-CFG-NEXT:    br label [[EXIT]]
; SIMPLIFY-CFG:       exit:
; SIMPLIFY-CFG-NEXT:    [[RET:%.*]] = phi i8 [ 0, [[ELSE]] ], [ 0, [[SWITCH_CASE_0]] ], [ 1, [[SWITCH_CASE_1]] ], [ 3, [[ENTRY:%.*]] ], [ 2, [[THEN]] ]
; SIMPLIFY-CFG-NEXT:    ret i8 [[RET]]
;
entry:
  store ptr blockaddress(@test_no_merge_address_taken, %switch.case.0), ptr %p
  switch i8 %v1, label %exit [
  i8 0, label %then
  i8 1, label %else
  ]

then:                                             ; preds = %entry
  switch i8 %v2, label %exit [
  i8 0, label %switch.case.0
  i8 1, label %switch.case.1
  i8 2, label %switch.case.2
  ]

switch.case.0:                                    ; preds = %then
  br label %exit

switch.case.1:                                    ; preds = %then
  br label %exit

switch.case.2:                                    ; preds = %then
  br label %exit

else:                                             ; preds = %entry
  br label %exit

exit:                                             ; preds = %else, %switch.case.2, %switch.case.1, %switch.case.0, %then, %entry
  %ret = phi i8 [ 0, %else ], [ 0, %switch.case.0 ], [ 1, %switch.case.1 ], [ 1, %switch.case.2 ], [ 2, %then ], [ 3, %entry ]
  ret i8 %ret
}