llvm/test/Transforms/DFAJumpThreading/max-outer-uses.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -S -passes=dfa-jump-threading -dfa-max-out-use-blocks=5 %s | FileCheck %s

declare void @use(i32)

define void @max_outer_uses_by_switch(i32 %cond, ptr %p) {
; CHECK-LABEL: define void @max_outer_uses_by_switch(
; CHECK-SAME: i32 [[COND:%.*]], ptr [[P:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[SWITCH_BB:.*]]
; CHECK:       [[SWITCH_BB]]:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[DETERMINE:%.*]], %[[SUB_SWITCH_BB:.*]] ], [ 2, %[[CASE2:.*]] ]
; CHECK-NEXT:    switch i32 [[PHI]], label %[[DEFAULT_DEST:.*]] [
; CHECK-NEXT:      i32 0, label %[[CASE1:.*]]
; CHECK-NEXT:      i32 1, label %[[CASE2]]
; CHECK-NEXT:      i32 2, label %[[CASE3:.*]]
; CHECK-NEXT:    ]
; CHECK:       [[CASE1]]:
; CHECK-NEXT:    br label %[[SUB_SWITCH_BB]]
; CHECK:       [[CASE3]]:
; CHECK-NEXT:    br label %[[SUB_SWITCH_BB]]
; CHECK:       [[SUB_SWITCH_BB]]:
; CHECK-NEXT:    [[DETERMINE]] = phi i32 [ 1, %[[CASE1]] ], [ 3, %[[CASE3]] ]
; CHECK-NEXT:    [[DEF:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT:    switch i32 [[COND]], label %[[SWITCH_BB]] [
; CHECK-NEXT:      i32 0, label %[[OUTER1:.*]]
; CHECK-NEXT:      i32 1, label %[[OUTER2:.*]]
; CHECK-NEXT:      i32 2, label %[[OUTER3:.*]]
; CHECK-NEXT:      i32 3, label %[[OUTER4:.*]]
; CHECK-NEXT:    ]
; CHECK:       [[CASE2]]:
; CHECK-NEXT:    br label %[[SWITCH_BB]]
; CHECK:       [[OUTER1]]:
; CHECK-NEXT:    call void @use(i32 [[DEF]])
; CHECK-NEXT:    ret void
; CHECK:       [[OUTER2]]:
; CHECK-NEXT:    call void @use(i32 [[DEF]])
; CHECK-NEXT:    ret void
; CHECK:       [[OUTER3]]:
; CHECK-NEXT:    call void @use(i32 [[DEF]])
; CHECK-NEXT:    ret void
; CHECK:       [[OUTER4]]:
; CHECK-NEXT:    call void @use(i32 [[DEF]])
; CHECK-NEXT:    ret void
; CHECK:       [[DEFAULT_DEST]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %switch_bb

switch_bb:
  %phi = phi i32 [ 0, %entry ], [ %determine, %sub_switch_bb ], [ 2, %case2 ]
  switch i32 %phi, label %default_dest [
  i32 0, label %case1
  i32 1, label %case2
  i32 2, label %case3
  ]

case1:
  br label %sub_switch_bb

case3:
  br label %sub_switch_bb

sub_switch_bb:
  %determine = phi i32 [ 1, %case1 ], [ 3, %case3 ]
  %def = load i32, ptr %p
  switch i32 %cond, label %switch_bb [
  i32 0, label %outer1
  i32 1, label %outer2
  i32 2, label %outer3
  i32 3, label %outer4
  ]

case2:
  br label %switch_bb

outer1:
  call void @use(i32 %def)
  ret void

outer2:
  call void @use(i32 %def)
  ret void

outer3:
  call void @use(i32 %def)
  ret void

outer4:
  call void @use(i32 %def)
  ret void

default_dest:
  ret void
}

define void @less_outer_uses_by_switch(i32 %cond, ptr %p) {
; CHECK-LABEL: define void @less_outer_uses_by_switch(
; CHECK-SAME: i32 [[COND:%.*]], ptr [[P:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[SWITCH_BB:.*]]
; CHECK:       [[SWITCH_BB]]:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ poison, %[[SUB_SWITCH_BB:.*]] ]
; CHECK-NEXT:    switch i32 [[PHI]], label %[[DEFAULT_DEST:.*]] [
; CHECK-NEXT:      i32 0, label %[[CASE1:.*]]
; CHECK-NEXT:      i32 1, label %[[CASE2:.*]]
; CHECK-NEXT:      i32 2, label %[[CASE3:.*]]
; CHECK-NEXT:    ]
; CHECK:       [[SWITCH_BB_JT2:.*]]:
; CHECK-NEXT:    [[PHI_JT2:%.*]] = phi i32 [ 2, %[[CASE2]] ]
; CHECK-NEXT:    br label %[[CASE3]]
; CHECK:       [[SWITCH_BB_JT3:.*]]:
; CHECK-NEXT:    [[PHI_JT3:%.*]] = phi i32 [ [[DETERMINE_JT3:%.*]], %[[SUB_SWITCH_BB_JT3:.*]] ]
; CHECK-NEXT:    br label %[[DEFAULT_DEST]]
; CHECK:       [[SWITCH_BB_JT1:.*]]:
; CHECK-NEXT:    [[PHI_JT1:%.*]] = phi i32 [ [[DETERMINE_JT1:%.*]], %[[SUB_SWITCH_BB_JT1:.*]] ]
; CHECK-NEXT:    br label %[[CASE2]]
; CHECK:       [[CASE1]]:
; CHECK-NEXT:    br label %[[SUB_SWITCH_BB_JT1]]
; CHECK:       [[CASE3]]:
; CHECK-NEXT:    br label %[[SUB_SWITCH_BB_JT3]]
; CHECK:       [[SUB_SWITCH_BB]]:
; CHECK-NEXT:    [[DEF:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT:    switch i32 [[COND]], label %[[SWITCH_BB]] [
; CHECK-NEXT:      i32 0, label %[[OUTER1:.*]]
; CHECK-NEXT:    ]
; CHECK:       [[SUB_SWITCH_BB_JT3]]:
; CHECK-NEXT:    [[DETERMINE_JT3]] = phi i32 [ 3, %[[CASE3]] ]
; CHECK-NEXT:    [[DEF_JT3:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT:    switch i32 [[COND]], label %[[SWITCH_BB_JT3]] [
; CHECK-NEXT:      i32 0, label %[[OUTER1]]
; CHECK-NEXT:    ]
; CHECK:       [[SUB_SWITCH_BB_JT1]]:
; CHECK-NEXT:    [[DETERMINE_JT1]] = phi i32 [ 1, %[[CASE1]] ]
; CHECK-NEXT:    [[DEF_JT1:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT:    switch i32 [[COND]], label %[[SWITCH_BB_JT1]] [
; CHECK-NEXT:      i32 0, label %[[OUTER1]]
; CHECK-NEXT:    ]
; CHECK:       [[CASE2]]:
; CHECK-NEXT:    br label %[[SWITCH_BB_JT2]]
; CHECK:       [[OUTER1]]:
; CHECK-NEXT:    [[DEF1:%.*]] = phi i32 [ [[DEF_JT3]], %[[SUB_SWITCH_BB_JT3]] ], [ [[DEF_JT1]], %[[SUB_SWITCH_BB_JT1]] ], [ [[DEF]], %[[SUB_SWITCH_BB]] ]
; CHECK-NEXT:    call void @use(i32 [[DEF1]])
; CHECK-NEXT:    ret void
; CHECK:       [[DEFAULT_DEST]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %switch_bb

switch_bb:
  %phi = phi i32 [ 0, %entry ], [ %determine, %sub_switch_bb ], [ 2, %case2 ]
  switch i32 %phi, label %default_dest [
  i32 0, label %case1
  i32 1, label %case2
  i32 2, label %case3
  ]

case1:
  br label %sub_switch_bb

case3:
  br label %sub_switch_bb

sub_switch_bb:
  %determine = phi i32 [ 1, %case1 ], [ 3, %case3 ]
  %def = load i32, ptr %p
  switch i32 %cond, label %switch_bb [
  i32 0, label %outer1
  ]

case2:
  br label %switch_bb

outer1:
  call void @use(i32 %def)
  ret void

default_dest:
  ret void
}


define void @max_outer_uses_multi_preds(i32 %cond, ptr %p) {
; CHECK-LABEL: define void @max_outer_uses_multi_preds(
; CHECK-SAME: i32 [[COND:%.*]], ptr [[P:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[SWITCH_BB:.*]]
; CHECK:       [[SWITCH_BB]]:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ poison, %[[SUB_SWITCH_BB:.*]] ]
; CHECK-NEXT:    switch i32 [[PHI]], label %[[DEFAULT_DEST:.*]] [
; CHECK-NEXT:      i32 0, label %[[CASE1:.*]]
; CHECK-NEXT:      i32 1, label %[[CASE2:.*]]
; CHECK-NEXT:      i32 2, label %[[CASE3:.*]]
; CHECK-NEXT:      i32 3, label %[[CASE4:.*]]
; CHECK-NEXT:    ]
; CHECK:       [[SWITCH_BB_JT2:.*]]:
; CHECK-NEXT:    [[PHI_JT2:%.*]] = phi i32 [ 2, %[[CASE2]] ]
; CHECK-NEXT:    br label %[[CASE3]]
; CHECK:       [[SWITCH_BB_JT3:.*]]:
; CHECK-NEXT:    [[PHI_JT3:%.*]] = phi i32 [ [[DETERMINE_JT3:%.*]], %[[SUB_SWITCH_BB_JT3:.*]] ]
; CHECK-NEXT:    br label %[[CASE4]]
; CHECK:       [[SWITCH_BB_JT1:.*]]:
; CHECK-NEXT:    [[PHI_JT1:%.*]] = phi i32 [ [[DETERMINE_JT1:%.*]], %[[SUB_SWITCH_BB_JT1:.*]] ]
; CHECK-NEXT:    br label %[[CASE2]]
; CHECK:       [[CASE1]]:
; CHECK-NEXT:    br label %[[SUB_SWITCH_BB_JT1]]
; CHECK:       [[CASE3]]:
; CHECK-NEXT:    br label %[[SUB_SWITCH_BB_JT3]]
; CHECK:       [[SUB_SWITCH_BB]]:
; CHECK-NEXT:    [[DEF:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT:    switch i32 [[COND]], label %[[SWITCH_BB]] [
; CHECK-NEXT:      i32 0, label %[[OUTER1:.*]]
; CHECK-NEXT:      i32 1, label %[[OUTER2:.*]]
; CHECK-NEXT:      i32 2, label %[[OUTER3:.*]]
; CHECK-NEXT:      i32 3, label %[[OUTER4:.*]]
; CHECK-NEXT:    ]
; CHECK:       [[SUB_SWITCH_BB_JT3]]:
; CHECK-NEXT:    [[DETERMINE_JT3]] = phi i32 [ 3, %[[CASE3]] ]
; CHECK-NEXT:    [[DEF_JT3:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT:    switch i32 [[COND]], label %[[SWITCH_BB_JT3]] [
; CHECK-NEXT:      i32 0, label %[[OUTER1]]
; CHECK-NEXT:      i32 1, label %[[OUTER2]]
; CHECK-NEXT:      i32 2, label %[[OUTER3]]
; CHECK-NEXT:      i32 3, label %[[OUTER4]]
; CHECK-NEXT:    ]
; CHECK:       [[SUB_SWITCH_BB_JT1]]:
; CHECK-NEXT:    [[DETERMINE_JT1]] = phi i32 [ 1, %[[CASE1]] ]
; CHECK-NEXT:    [[DEF_JT1:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT:    switch i32 [[COND]], label %[[SWITCH_BB_JT1]] [
; CHECK-NEXT:      i32 0, label %[[OUTER1]]
; CHECK-NEXT:      i32 1, label %[[OUTER2]]
; CHECK-NEXT:      i32 2, label %[[OUTER3]]
; CHECK-NEXT:      i32 3, label %[[OUTER4]]
; CHECK-NEXT:    ]
; CHECK:       [[CASE4]]:
; CHECK-NEXT:    [[DEF1:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT:    switch i32 [[COND]], label %[[OUTER4]] [
; CHECK-NEXT:      i32 0, label %[[OUTER1]]
; CHECK-NEXT:      i32 1, label %[[OUTER2]]
; CHECK-NEXT:      i32 2, label %[[OUTER3]]
; CHECK-NEXT:    ]
; CHECK:       [[CASE2]]:
; CHECK-NEXT:    br label %[[SWITCH_BB_JT2]]
; CHECK:       [[OUTER1]]:
; CHECK-NEXT:    [[PHI1:%.*]] = phi i32 [ [[DEF]], %[[SUB_SWITCH_BB]] ], [ [[DEF1]], %[[CASE4]] ], [ [[DEF_JT1]], %[[SUB_SWITCH_BB_JT1]] ], [ [[DEF_JT3]], %[[SUB_SWITCH_BB_JT3]] ]
; CHECK-NEXT:    call void @use(i32 [[PHI1]])
; CHECK-NEXT:    ret void
; CHECK:       [[OUTER2]]:
; CHECK-NEXT:    [[PHI2:%.*]] = phi i32 [ [[DEF]], %[[SUB_SWITCH_BB]] ], [ [[DEF1]], %[[CASE4]] ], [ [[DEF_JT1]], %[[SUB_SWITCH_BB_JT1]] ], [ [[DEF_JT3]], %[[SUB_SWITCH_BB_JT3]] ]
; CHECK-NEXT:    call void @use(i32 [[PHI2]])
; CHECK-NEXT:    ret void
; CHECK:       [[OUTER3]]:
; CHECK-NEXT:    [[PHI3:%.*]] = phi i32 [ [[DEF]], %[[SUB_SWITCH_BB]] ], [ [[DEF1]], %[[CASE4]] ], [ [[DEF_JT1]], %[[SUB_SWITCH_BB_JT1]] ], [ [[DEF_JT3]], %[[SUB_SWITCH_BB_JT3]] ]
; CHECK-NEXT:    call void @use(i32 [[PHI3]])
; CHECK-NEXT:    ret void
; CHECK:       [[OUTER4]]:
; CHECK-NEXT:    [[PHI4:%.*]] = phi i32 [ [[DEF]], %[[SUB_SWITCH_BB]] ], [ [[DEF1]], %[[CASE4]] ], [ [[DEF_JT1]], %[[SUB_SWITCH_BB_JT1]] ], [ [[DEF_JT3]], %[[SUB_SWITCH_BB_JT3]] ]
; CHECK-NEXT:    call void @use(i32 [[PHI4]])
; CHECK-NEXT:    ret void
; CHECK:       [[DEFAULT_DEST]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %switch_bb

switch_bb:
  %phi = phi i32 [ 0, %entry ], [ %determine, %sub_switch_bb ], [ 2, %case2 ]
  switch i32 %phi, label %default_dest [
  i32 0, label %case1
  i32 1, label %case2
  i32 2, label %case3
  i32 3, label %case4
  ]

case1:
  br label %sub_switch_bb

case3:
  br label %sub_switch_bb

sub_switch_bb:
  %determine = phi i32 [ 1, %case1 ], [ 3, %case3 ]
  %def = load i32, ptr %p
  switch i32 %cond, label %switch_bb [
  i32 0, label %outer1
  i32 1, label %outer2
  i32 2, label %outer3
  i32 3, label %outer4
  ]

case4:
  %def1 = load i32, ptr %p
  switch i32 %cond, label %outer4 [
  i32 0, label %outer1
  i32 1, label %outer2
  i32 2, label %outer3
  ]

case2:
  br label %switch_bb

outer1:
  %phi1 = phi i32 [ %def, %sub_switch_bb ], [ %def1, %case4 ]
  call void @use(i32 %phi1)
  ret void

outer2:
  %phi2 = phi i32 [ %def, %sub_switch_bb ], [ %def1, %case4 ]
  call void @use(i32 %phi2)
  ret void

outer3:
  %phi3 = phi i32 [ %def, %sub_switch_bb ], [ %def1, %case4 ]
  call void @use(i32 %phi3)
  ret void

outer4:
  %phi4 = phi i32 [ %def, %sub_switch_bb ], [ %def1, %case4 ]
  call void @use(i32 %phi4)
  ret void

default_dest:
  ret void
}