llvm/test/Transforms/DFAJumpThreading/dfa-unfold-select.ll

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

; These tests check if selects are unfolded properly for jump threading
; opportunities. There are three different patterns to consider:
; 1) Both operands are constant and the false branch is unfolded by default
; 2) One operand is constant and the other is another select to be unfolded. In
;    this case a single select is sunk to a new block to unfold.
; 3) Both operands are a select, and both should be sunk to new blocks.
define i32 @test1(i32 %num) {
; CHECK-LABEL: @test1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[COUNT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ]
; CHECK-NEXT:    [[STATE:%.*]] = phi i32 [ 1, [[ENTRY]] ], [ undef, [[FOR_INC]] ]
; CHECK-NEXT:    switch i32 [[STATE]], label [[FOR_INC_JT1:%.*]] [
; CHECK-NEXT:    i32 1, label [[CASE1:%.*]]
; CHECK-NEXT:    i32 2, label [[CASE2:%.*]]
; CHECK-NEXT:    ]
; CHECK:       for.body.jt2:
; CHECK-NEXT:    [[COUNT_JT2:%.*]] = phi i32 [ [[INC_JT2:%.*]], [[FOR_INC_JT2:%.*]] ]
; CHECK-NEXT:    [[STATE_JT2:%.*]] = phi i32 [ [[STATE_NEXT_JT2:%.*]], [[FOR_INC_JT2]] ]
; CHECK-NEXT:    br label [[CASE2]]
; CHECK:       for.body.jt1:
; CHECK-NEXT:    [[COUNT_JT1:%.*]] = phi i32 [ [[INC_JT1:%.*]], [[FOR_INC_JT1]] ]
; CHECK-NEXT:    [[STATE_JT1:%.*]] = phi i32 [ [[STATE_NEXT_JT1:%.*]], [[FOR_INC_JT1]] ]
; CHECK-NEXT:    br label [[CASE1]]
; CHECK:       case1:
; CHECK-NEXT:    [[COUNT2:%.*]] = phi i32 [ [[COUNT_JT1]], [[FOR_BODY_JT1:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ]
; CHECK-NEXT:    br label [[FOR_INC_JT2]]
; CHECK:       case2:
; CHECK-NEXT:    [[COUNT1:%.*]] = phi i32 [ [[COUNT_JT2]], [[FOR_BODY_JT2:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[COUNT1]], 50
; CHECK-NEXT:    br i1 [[CMP]], label [[FOR_INC_JT1]], label [[SI_UNFOLD_FALSE:%.*]]
; CHECK:       si.unfold.false:
; CHECK-NEXT:    br label [[FOR_INC_JT2]]
; CHECK:       for.inc:
; CHECK-NEXT:    [[INC]] = add nsw i32 undef, 1
; CHECK-NEXT:    [[CMP_EXIT:%.*]] = icmp slt i32 [[INC]], [[NUM:%.*]]
; CHECK-NEXT:    br i1 [[CMP_EXIT]], label [[FOR_BODY]], label [[FOR_END:%.*]]
; CHECK:       for.inc.jt2:
; CHECK-NEXT:    [[COUNT4:%.*]] = phi i32 [ [[COUNT1]], [[SI_UNFOLD_FALSE]] ], [ [[COUNT2]], [[CASE1]] ]
; CHECK-NEXT:    [[STATE_NEXT_JT2]] = phi i32 [ 2, [[CASE1]] ], [ 2, [[SI_UNFOLD_FALSE]] ]
; CHECK-NEXT:    [[INC_JT2]] = add nsw i32 [[COUNT4]], 1
; CHECK-NEXT:    [[CMP_EXIT_JT2:%.*]] = icmp slt i32 [[INC_JT2]], [[NUM]]
; CHECK-NEXT:    br i1 [[CMP_EXIT_JT2]], label [[FOR_BODY_JT2]], label [[FOR_END]]
; CHECK:       for.inc.jt1:
; CHECK-NEXT:    [[COUNT3:%.*]] = phi i32 [ [[COUNT1]], [[CASE2]] ], [ [[COUNT]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[STATE_NEXT_JT1]] = phi i32 [ 1, [[CASE2]] ], [ 1, [[FOR_BODY]] ]
; CHECK-NEXT:    [[INC_JT1]] = add nsw i32 [[COUNT3]], 1
; CHECK-NEXT:    [[CMP_EXIT_JT1:%.*]] = icmp slt i32 [[INC_JT1]], [[NUM]]
; CHECK-NEXT:    br i1 [[CMP_EXIT_JT1]], label [[FOR_BODY_JT1]], label [[FOR_END]]
; CHECK:       for.end:
; CHECK-NEXT:    ret i32 0
;
entry:
  br label %for.body

for.body:
  %count = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
  %state = phi i32 [ 1, %entry ], [ %state.next, %for.inc ]
  switch i32 %state, label %for.inc [
  i32 1, label %case1
  i32 2, label %case2
  ]

case1:
  br label %for.inc

case2:
  %cmp = icmp slt i32 %count, 50
  %sel = select i1 %cmp, i32 1, i32 2
  br label %for.inc

for.inc:
  %state.next = phi i32 [ %sel, %case2 ], [ 1, %for.body ], [ 2, %case1 ]
  %inc = add nsw i32 %count, 1
  %cmp.exit = icmp slt i32 %inc, %num
  br i1 %cmp.exit, label %for.body, label %for.end

for.end:
  ret i32 0
}

define i32 @test2(i32 %num) {
; CHECK-LABEL: @test2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[COUNT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ]
; CHECK-NEXT:    [[STATE:%.*]] = phi i32 [ 1, [[ENTRY]] ], [ undef, [[FOR_INC]] ]
; CHECK-NEXT:    switch i32 [[STATE]], label [[FOR_INC_JT1:%.*]] [
; CHECK-NEXT:    i32 1, label [[CASE1:%.*]]
; CHECK-NEXT:    i32 2, label [[CASE2:%.*]]
; CHECK-NEXT:    ]
; CHECK:       for.body.jt3:
; CHECK-NEXT:    [[COUNT_JT3:%.*]] = phi i32 [ [[INC_JT3:%.*]], [[FOR_INC_JT3:%.*]] ]
; CHECK-NEXT:    [[STATE_JT3:%.*]] = phi i32 [ [[STATE_NEXT_JT3:%.*]], [[FOR_INC_JT3]] ]
; CHECK-NEXT:    br label [[FOR_INC_JT1]]
; CHECK:       for.body.jt2:
; CHECK-NEXT:    [[COUNT_JT2:%.*]] = phi i32 [ [[INC_JT2:%.*]], [[FOR_INC_JT2:%.*]] ]
; CHECK-NEXT:    [[STATE_JT2:%.*]] = phi i32 [ [[STATE_NEXT_JT2:%.*]], [[FOR_INC_JT2]] ]
; CHECK-NEXT:    br label [[CASE2]]
; CHECK:       for.body.jt1:
; CHECK-NEXT:    [[COUNT_JT1:%.*]] = phi i32 [ [[INC_JT1:%.*]], [[FOR_INC_JT1]] ]
; CHECK-NEXT:    [[STATE_JT1:%.*]] = phi i32 [ [[STATE_NEXT_JT1:%.*]], [[FOR_INC_JT1]] ]
; CHECK-NEXT:    br label [[CASE1]]
; CHECK:       case1:
; CHECK-NEXT:    [[COUNT5:%.*]] = phi i32 [ [[COUNT_JT1]], [[FOR_BODY_JT1:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[CMP_C1:%.*]] = icmp slt i32 [[COUNT5]], 50
; CHECK-NEXT:    [[CMP2_C1:%.*]] = icmp slt i32 [[COUNT5]], 100
; CHECK-NEXT:    br i1 [[CMP2_C1]], label [[SI_UNFOLD_TRUE:%.*]], label [[FOR_INC_JT3]]
; CHECK:       case2:
; CHECK-NEXT:    [[COUNT3:%.*]] = phi i32 [ [[COUNT_JT2]], [[FOR_BODY_JT2:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[CMP_C2:%.*]] = icmp slt i32 [[COUNT3]], 50
; CHECK-NEXT:    [[CMP2_C2:%.*]] = icmp sgt i32 [[COUNT3]], 100
; CHECK-NEXT:    br i1 [[CMP2_C2]], label [[FOR_INC_JT3]], label [[SI_UNFOLD_FALSE:%.*]]
; CHECK:       si.unfold.false:
; CHECK-NEXT:    br i1 [[CMP_C2]], label [[FOR_INC_JT1]], label [[SI_UNFOLD_FALSE1:%.*]]
; CHECK:       si.unfold.false1:
; CHECK-NEXT:    br label [[FOR_INC_JT2]]
; CHECK:       si.unfold.true:
; CHECK-NEXT:    br i1 [[CMP_C1]], label [[FOR_INC_JT1]], label [[SI_UNFOLD_FALSE2:%.*]]
; CHECK:       si.unfold.false2:
; CHECK-NEXT:    br label [[FOR_INC_JT2]]
; CHECK:       for.inc:
; CHECK-NEXT:    [[INC]] = add nsw i32 undef, 1
; CHECK-NEXT:    [[CMP_EXIT:%.*]] = icmp slt i32 [[INC]], [[NUM:%.*]]
; CHECK-NEXT:    br i1 [[CMP_EXIT]], label [[FOR_BODY]], label [[FOR_END:%.*]]
; CHECK:       for.inc.jt3:
; CHECK-NEXT:    [[COUNT6:%.*]] = phi i32 [ [[COUNT3]], [[CASE2]] ], [ [[COUNT5]], [[CASE1]] ]
; CHECK-NEXT:    [[STATE_NEXT_JT3]] = phi i32 [ 3, [[CASE1]] ], [ 3, [[CASE2]] ]
; CHECK-NEXT:    [[INC_JT3]] = add nsw i32 [[COUNT6]], 1
; CHECK-NEXT:    [[CMP_EXIT_JT3:%.*]] = icmp slt i32 [[INC_JT3]], [[NUM]]
; CHECK-NEXT:    br i1 [[CMP_EXIT_JT3]], label [[FOR_BODY_JT3:%.*]], label [[FOR_END]]
; CHECK:       for.inc.jt2:
; CHECK-NEXT:    [[COUNT7:%.*]] = phi i32 [ [[COUNT3]], [[SI_UNFOLD_FALSE1]] ], [ [[COUNT5]], [[SI_UNFOLD_FALSE2]] ]
; CHECK-NEXT:    [[STATE_NEXT_JT2]] = phi i32 [ 2, [[SI_UNFOLD_FALSE1]] ], [ 2, [[SI_UNFOLD_FALSE2]] ]
; CHECK-NEXT:    [[INC_JT2]] = add nsw i32 [[COUNT7]], 1
; CHECK-NEXT:    [[CMP_EXIT_JT2:%.*]] = icmp slt i32 [[INC_JT2]], [[NUM]]
; CHECK-NEXT:    br i1 [[CMP_EXIT_JT2]], label [[FOR_BODY_JT2]], label [[FOR_END]]
; CHECK:       for.inc.jt1:
; CHECK-NEXT:    [[COUNT4:%.*]] = phi i32 [ [[COUNT_JT3]], [[FOR_BODY_JT3]] ], [ [[COUNT3]], [[SI_UNFOLD_FALSE]] ], [ [[COUNT5]], [[SI_UNFOLD_TRUE]] ], [ [[COUNT]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[STATE_NEXT_JT1]] = phi i32 [ 1, [[FOR_BODY]] ], [ 1, [[SI_UNFOLD_FALSE]] ], [ 1, [[SI_UNFOLD_TRUE]] ], [ 1, [[FOR_BODY_JT3]] ]
; CHECK-NEXT:    [[INC_JT1]] = add nsw i32 [[COUNT4]], 1
; CHECK-NEXT:    [[CMP_EXIT_JT1:%.*]] = icmp slt i32 [[INC_JT1]], [[NUM]]
; CHECK-NEXT:    br i1 [[CMP_EXIT_JT1]], label [[FOR_BODY_JT1]], label [[FOR_END]]
; CHECK:       for.end:
; CHECK-NEXT:    ret i32 0
;
entry:
  br label %for.body

for.body:
  %count = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
  %state = phi i32 [ 1, %entry ], [ %state.next, %for.inc ]
  switch i32 %state, label %for.inc [
  i32 1, label %case1
  i32 2, label %case2
  ]

case1:
  %cmp.c1 = icmp slt i32 %count, 50
  %cmp2.c1 = icmp slt i32 %count, 100
  %state1.1 = select i1 %cmp.c1, i32 1, i32 2
  %state1.2 = select i1 %cmp2.c1, i32 %state1.1, i32 3
  br label %for.inc

case2:
  %cmp.c2 = icmp slt i32 %count, 50
  %cmp2.c2 = icmp sgt i32 %count, 100
  %state2.1 = select i1 %cmp.c2, i32 1, i32 2
  %state2.2 = select i1 %cmp2.c2, i32 3, i32 %state2.1
  br label %for.inc

for.inc:
  %state.next = phi i32 [ %state1.2, %case1 ], [ %state2.2, %case2 ], [ 1, %for.body ]
  %inc = add nsw i32 %count, 1
  %cmp.exit = icmp slt i32 %inc, %num
  br i1 %cmp.exit, label %for.body, label %for.end

for.end:
  ret i32 0
}

define i32 @test3(i32 %num) {
; CHECK-LABEL: @test3(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[COUNT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ]
; CHECK-NEXT:    [[STATE:%.*]] = phi i32 [ 1, [[ENTRY]] ], [ undef, [[FOR_INC]] ]
; CHECK-NEXT:    switch i32 [[STATE]], label [[FOR_INC_JT1:%.*]] [
; CHECK-NEXT:    i32 1, label [[CASE1:%.*]]
; CHECK-NEXT:    i32 2, label [[CASE2:%.*]]
; CHECK-NEXT:    ]
; CHECK:       for.body.jt4:
; CHECK-NEXT:    [[COUNT_JT4:%.*]] = phi i32 [ [[INC_JT4:%.*]], [[FOR_INC_JT4:%.*]] ]
; CHECK-NEXT:    [[STATE_JT4:%.*]] = phi i32 [ [[STATE_NEXT_JT4:%.*]], [[FOR_INC_JT4]] ]
; CHECK-NEXT:    br label [[FOR_INC_JT1]]
; CHECK:       for.body.jt3:
; CHECK-NEXT:    [[COUNT_JT3:%.*]] = phi i32 [ [[INC_JT3:%.*]], [[FOR_INC_JT3:%.*]] ]
; CHECK-NEXT:    [[STATE_JT3:%.*]] = phi i32 [ [[STATE_NEXT_JT3:%.*]], [[FOR_INC_JT3]] ]
; CHECK-NEXT:    br label [[FOR_INC_JT1]]
; CHECK:       for.body.jt2:
; CHECK-NEXT:    [[COUNT_JT2:%.*]] = phi i32 [ [[INC_JT2:%.*]], [[FOR_INC_JT2:%.*]] ]
; CHECK-NEXT:    [[STATE_JT2:%.*]] = phi i32 [ [[STATE_NEXT_JT2:%.*]], [[FOR_INC_JT2]] ]
; CHECK-NEXT:    br label [[CASE2]]
; CHECK:       for.body.jt1:
; CHECK-NEXT:    [[COUNT_JT1:%.*]] = phi i32 [ [[INC_JT1:%.*]], [[FOR_INC_JT1]] ]
; CHECK-NEXT:    [[STATE_JT1:%.*]] = phi i32 [ [[STATE_NEXT_JT1:%.*]], [[FOR_INC_JT1]] ]
; CHECK-NEXT:    br label [[CASE1]]
; CHECK:       case1:
; CHECK-NEXT:    [[COUNT5:%.*]] = phi i32 [ [[COUNT_JT1]], [[FOR_BODY_JT1:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ]
; CHECK-NEXT:    br label [[FOR_INC_JT2]]
; CHECK:       case2:
; CHECK-NEXT:    [[COUNT4:%.*]] = phi i32 [ [[COUNT_JT2]], [[FOR_BODY_JT2:%.*]] ], [ [[COUNT]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[CMP_1:%.*]] = icmp slt i32 [[COUNT4]], 50
; CHECK-NEXT:    [[CMP_2:%.*]] = icmp slt i32 [[COUNT4]], 100
; CHECK-NEXT:    [[TMP0:%.*]] = and i32 [[COUNT4]], 1
; CHECK-NEXT:    [[CMP_3:%.*]] = icmp eq i32 [[TMP0]], 0
; CHECK-NEXT:    br i1 [[CMP_3]], label [[SI_UNFOLD_TRUE:%.*]], label [[SI_UNFOLD_FALSE:%.*]]
; CHECK:       si.unfold.true:
; CHECK-NEXT:    br i1 [[CMP_1]], label [[FOR_INC_JT1]], label [[SI_UNFOLD_FALSE2:%.*]]
; CHECK:       si.unfold.false:
; CHECK-NEXT:    br i1 [[CMP_2]], label [[FOR_INC_JT3]], label [[SI_UNFOLD_FALSE1:%.*]]
; CHECK:       si.unfold.false1:
; CHECK-NEXT:    br label [[FOR_INC_JT4]]
; CHECK:       si.unfold.false2:
; CHECK-NEXT:    br label [[FOR_INC_JT2]]
; CHECK:       for.inc:
; CHECK-NEXT:    [[INC]] = add nsw i32 undef, 1
; CHECK-NEXT:    [[CMP_EXIT:%.*]] = icmp slt i32 [[INC]], [[NUM:%.*]]
; CHECK-NEXT:    br i1 [[CMP_EXIT]], label [[FOR_BODY]], label [[FOR_END:%.*]]
; CHECK:       for.inc.jt4:
; CHECK-NEXT:    [[STATE_NEXT_JT4]] = phi i32 [ 4, [[SI_UNFOLD_FALSE1]] ]
; CHECK-NEXT:    [[INC_JT4]] = add nsw i32 [[COUNT4]], 1
; CHECK-NEXT:    [[CMP_EXIT_JT4:%.*]] = icmp slt i32 [[INC_JT4]], [[NUM]]
; CHECK-NEXT:    br i1 [[CMP_EXIT_JT4]], label [[FOR_BODY_JT4:%.*]], label [[FOR_END]]
; CHECK:       for.inc.jt3:
; CHECK-NEXT:    [[STATE_NEXT_JT3]] = phi i32 [ 3, [[SI_UNFOLD_FALSE]] ]
; CHECK-NEXT:    [[INC_JT3]] = add nsw i32 [[COUNT4]], 1
; CHECK-NEXT:    [[CMP_EXIT_JT3:%.*]] = icmp slt i32 [[INC_JT3]], [[NUM]]
; CHECK-NEXT:    br i1 [[CMP_EXIT_JT3]], label [[FOR_BODY_JT3:%.*]], label [[FOR_END]]
; CHECK:       for.inc.jt2:
; CHECK-NEXT:    [[COUNT6:%.*]] = phi i32 [ [[COUNT4]], [[SI_UNFOLD_FALSE2]] ], [ [[COUNT5]], [[CASE1]] ]
; CHECK-NEXT:    [[STATE_NEXT_JT2]] = phi i32 [ 2, [[CASE1]] ], [ 2, [[SI_UNFOLD_FALSE2]] ]
; CHECK-NEXT:    [[INC_JT2]] = add nsw i32 [[COUNT6]], 1
; CHECK-NEXT:    [[CMP_EXIT_JT2:%.*]] = icmp slt i32 [[INC_JT2]], [[NUM]]
; CHECK-NEXT:    br i1 [[CMP_EXIT_JT2]], label [[FOR_BODY_JT2]], label [[FOR_END]]
; CHECK:       for.inc.jt1:
; CHECK-NEXT:    [[COUNT3:%.*]] = phi i32 [ [[COUNT_JT4]], [[FOR_BODY_JT4]] ], [ [[COUNT_JT3]], [[FOR_BODY_JT3]] ], [ [[COUNT4]], [[SI_UNFOLD_TRUE]] ], [ [[COUNT]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[STATE_NEXT_JT1]] = phi i32 [ 1, [[FOR_BODY]] ], [ 1, [[SI_UNFOLD_TRUE]] ], [ 1, [[FOR_BODY_JT3]] ], [ 1, [[FOR_BODY_JT4]] ]
; CHECK-NEXT:    [[INC_JT1]] = add nsw i32 [[COUNT3]], 1
; CHECK-NEXT:    [[CMP_EXIT_JT1:%.*]] = icmp slt i32 [[INC_JT1]], [[NUM]]
; CHECK-NEXT:    br i1 [[CMP_EXIT_JT1]], label [[FOR_BODY_JT1]], label [[FOR_END]]
; CHECK:       for.end:
; CHECK-NEXT:    ret i32 0
;
entry:
  br label %for.body

for.body:
  %count = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
  %state = phi i32 [ 1, %entry ], [ %state.next, %for.inc ]
  switch i32 %state, label %for.inc [
  i32 1, label %case1
  i32 2, label %case2
  ]

case1:
  br label %for.inc

case2:
  %cmp.1 = icmp slt i32 %count, 50
  %cmp.2 = icmp slt i32 %count, 100
  %0 = and i32 %count, 1
  %cmp.3 = icmp eq i32 %0, 0
  %sel.1 = select i1 %cmp.1, i32 1, i32 2
  %sel.2 = select i1 %cmp.2, i32 3, i32 4
  %sel.3 = select i1 %cmp.3, i32 %sel.1, i32 %sel.2
  br label %for.inc

for.inc:
  %state.next = phi i32 [ %sel.3, %case2 ], [ 1, %for.body ], [ 2, %case1 ]
  %inc = add nsw i32 %count, 1
  %cmp.exit = icmp slt i32 %inc, %num
  br i1 %cmp.exit, label %for.body, label %for.end

for.end:
  ret i32 0
}