xref: /llvm-project-15.0.7/llvm/test/Transforms/JumpThreading/select.ll (revision 6f0ca6fd)

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

declare void @foo()
declare void @bar()
declare void @baz()
declare void @quux()


; Jump threading of branch with select as condition.
; Mostly theoretical since instruction combining simplifies all selects of
; booleans where at least one operand is true/false/undef.

define void @test_br(i1 %cond, i1 %value) nounwind {
; CHECK-LABEL: @test_br(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[L1:%.*]], label [[L0:%.*]]
; CHECK:       L0:
; CHECK-NEXT:    call void @baz()
; CHECK-NEXT:    [[EXPR:%.*]] = select i1 [[COND]], i1 true, i1 [[VALUE:%.*]]
; CHECK-NEXT:    br i1 [[EXPR]], label [[L1]], label [[L2:%.*]]
; CHECK:       L1:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    ret void
; CHECK:       L2:
; CHECK-NEXT:    call void @bar()
; CHECK-NEXT:    ret void
;
entry:
  br i1 %cond, label %L0, label %L3
L0:
  %expr = select i1 %cond, i1 true, i1 %value
  br i1 %expr, label %L1, label %L2

L1:
  call void @foo()
  ret void
L2:
  call void @bar()
  ret void
L3:
  call void @baz()
  br label %L0
}


; Jump threading of switch with select as condition.

define void @test_switch(i1 %cond, i8 %value) nounwind {
; CHECK-LABEL: @test_switch(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[L1:%.*]], label [[L0:%.*]]
; CHECK:       L0:
; CHECK-NEXT:    call void @quux()
; CHECK-NEXT:    [[EXPR:%.*]] = select i1 [[COND]], i8 1, i8 [[VALUE:%.*]]
; CHECK-NEXT:    switch i8 [[EXPR]], label [[L3:%.*]] [
; CHECK-NEXT:    i8 1, label [[L1]]
; CHECK-NEXT:    i8 2, label [[L2:%.*]]
; CHECK-NEXT:    ]
; CHECK:       L1:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    ret void
; CHECK:       L2:
; CHECK-NEXT:    call void @bar()
; CHECK-NEXT:    ret void
; CHECK:       L3:
; CHECK-NEXT:    call void @baz()
; CHECK-NEXT:    ret void
;
entry:
  br i1 %cond, label %L0, label %L4
L0:
  %expr = select i1 %cond, i8 1, i8 %value
  switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]

L1:
  call void @foo()
  ret void
L2:
  call void @bar()
  ret void
L3:
  call void @baz()
  ret void
L4:
  call void @quux()
  br label %L0
}

; Make sure the blocks in the indirectbr test aren't trivially removable as
; successors by taking their addresses.
@anchor = constant [3 x i8*] [
  i8* blockaddress(@test_indirectbr, %L1),
  i8* blockaddress(@test_indirectbr, %L2),
  i8* blockaddress(@test_indirectbr, %L3)
]


; Jump threading of indirectbr with select as address.

define void @test_indirectbr(i1 %cond, i8* %address) nounwind {
; CHECK-LABEL: @test_indirectbr(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[L1:%.*]], label [[L3:%.*]]
; CHECK:       L1:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    ret void
; CHECK:       L3:
; CHECK-NEXT:    call void @baz()
; CHECK-NEXT:    ret void
;
entry:
  br i1 %cond, label %L0, label %L3
L0:
  %indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr, %L1), i8* %address
  indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]

L1:
  call void @foo()
  ret void
L2:
  call void @bar()
  ret void
L3:
  call void @baz()
  ret void
}


; Jump threading of indirectbr with select as address.  Test increased
; duplication threshold for cases where indirectbr is being threaded
; through.

define void @test_indirectbr_thresh(i1 %cond, i8* %address) nounwind {
; CHECK-LABEL: @test_indirectbr_thresh(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[L1:%.*]], label [[L3:%.*]]
; CHECK:       L1:
; CHECK-NEXT:    call void @quux()
; CHECK-NEXT:    call void @quux()
; CHECK-NEXT:    call void @quux()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    ret void
; CHECK:       L3:
; CHECK-NEXT:    call void @baz()
; CHECK-NEXT:    ret void
;
entry:
  br i1 %cond, label %L0, label %L3
L0:
  %indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr_thresh, %L1), i8* %address
  call void @quux()
  call void @quux()
  call void @quux()
  indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]

L1:
  call void @foo()
  ret void
L2:
  call void @bar()
  ret void
L3:
  call void @baz()
  ret void
}


; A more complicated case: the condition is a select based on a comparison.

define void @test_switch_cmp(i1 %cond, i32 %val, i8 %value) nounwind {
; CHECK-LABEL: @test_switch_cmp(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[L0:%.*]], label [[L0_THREAD:%.*]]
; CHECK:       L0:
; CHECK-NEXT:    [[VAL_PHI:%.*]] = phi i32 [ [[VAL:%.*]], [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[VAL_PHI]], 0
; CHECK-NEXT:    [[COND_FR:%.*]] = freeze i1 [[CMP]]
; CHECK-NEXT:    br i1 [[COND_FR]], label [[L1:%.*]], label [[TMP0:%.*]]
; CHECK:       0:
; CHECK-NEXT:    [[TMP1:%.*]] = phi i8 [ [[VALUE:%.*]], [[L0]] ]
; CHECK-NEXT:    switch i8 [[TMP1]], label [[L3:%.*]] [
; CHECK-NEXT:    i8 1, label [[L1]]
; CHECK-NEXT:    i8 2, label [[L2:%.*]]
; CHECK-NEXT:    ]
; CHECK:       L1:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    ret void
; CHECK:       L2:
; CHECK-NEXT:    call void @bar()
; CHECK-NEXT:    ret void
; CHECK:       L3:
; CHECK-NEXT:    call void @baz()
; CHECK-NEXT:    ret void
; CHECK:       L0.thread:
; CHECK-NEXT:    call void @quux()
; CHECK-NEXT:    br label [[L1]]
;
entry:
  br i1 %cond, label %L0, label %L4
L0:
  %val.phi = phi i32 [%val, %entry], [-1, %L4]
  %cmp = icmp slt i32 %val.phi, 0
  %expr = select i1 %cmp, i8 1, i8 %value
  switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]

L1:
  call void @foo()
  ret void
L2:
  call void @bar()
  ret void
L3:
  call void @baz()
  ret void
L4:
  call void @quux()
  br label %L0
}

; Make sure the edge value of %0 from entry to L2 includes 0 and L3 is
; reachable.
define void @test_switch_default(i32* nocapture %status) nounwind {
; CHECK-LABEL: @test_switch_default(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[TMP0:%.*]] = load i32, i32* [[STATUS:%.*]], align 4
; CHECK-NEXT:    switch i32 [[TMP0]], label [[L2:%.*]] [
; CHECK-NEXT:    i32 5061, label [[L2_THREAD:%.*]]
; CHECK-NEXT:    i32 0, label [[L2]]
; CHECK-NEXT:    ]
; CHECK:       L2.thread:
; CHECK-NEXT:    store i32 10025, i32* [[STATUS]], align 4
; CHECK-NEXT:    br label [[L4:%.*]]
; CHECK:       L2:
; CHECK-NEXT:    [[TMP1:%.*]] = phi i32 [ [[TMP0]], [[ENTRY:%.*]] ], [ [[TMP0]], [[ENTRY]] ]
; CHECK-NEXT:    [[CMP57_I:%.*]] = icmp eq i32 [[TMP1]], 0
; CHECK-NEXT:    br i1 [[CMP57_I]], label [[L3:%.*]], label [[L4]]
; CHECK:       L3:
; CHECK-NEXT:    store i32 10000, i32* [[STATUS]], align 4
; CHECK-NEXT:    br label [[L4]]
; CHECK:       L4:
; CHECK-NEXT:    ret void
;
entry:
  %0 = load i32, i32* %status, align 4
  switch i32 %0, label %L2 [
  i32 5061, label %L1
  i32 0, label %L2
  ]

L1:
  store i32 10025, i32* %status, align 4
  br label %L2

L2:
  %1 = load i32, i32* %status, align 4
  %cmp57.i = icmp eq i32 %1, 0
  br i1 %cmp57.i, label %L3, label %L4

L3:
  store i32 10000, i32* %status, align 4
  br label %L4

L4:
  ret void
}

define void @unfold1(double %x, double %y) nounwind {
; CHECK-LABEL: @unfold1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SUB:%.*]] = fsub double [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[CMP:%.*]] = fcmp ogt double [[SUB]], 1.000000e+01
; CHECK-NEXT:    br i1 [[CMP]], label [[COND_END4:%.*]], label [[COND_FALSE:%.*]]
; CHECK:       cond.false:
; CHECK-NEXT:    [[ADD:%.*]] = fadd double [[X]], [[Y]]
; CHECK-NEXT:    [[CMP1:%.*]] = fcmp ogt double [[ADD]], 1.000000e+01
; CHECK-NEXT:    br i1 [[CMP1]], label [[COND_END4]], label [[IF_THEN:%.*]]
; CHECK:       cond.end4:
; CHECK-NEXT:    [[COND5:%.*]] = phi double [ [[SUB]], [[ENTRY:%.*]] ], [ [[ADD]], [[COND_FALSE]] ]
; CHECK-NEXT:    [[CMP6:%.*]] = fcmp oeq double [[COND5]], 0.000000e+00
; CHECK-NEXT:    br i1 [[CMP6]], label [[IF_THEN]], label [[IF_END:%.*]]
; CHECK:       if.then:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[IF_END]]
; CHECK:       if.end:
; CHECK-NEXT:    ret void
;
entry:
  %sub = fsub double %x, %y
  %cmp = fcmp ogt double %sub, 1.000000e+01
  br i1 %cmp, label %cond.end4, label %cond.false

cond.false:                                       ; preds = %entry
  %add = fadd double %x, %y
  %cmp1 = fcmp ogt double %add, 1.000000e+01
  %add. = select i1 %cmp1, double %add, double 0.000000e+00
  br label %cond.end4

cond.end4:                                        ; preds = %entry, %cond.false
  %cond5 = phi double [ %add., %cond.false ], [ %sub, %entry ]
  %cmp6 = fcmp oeq double %cond5, 0.000000e+00
  br i1 %cmp6, label %if.then, label %if.end

if.then:                                          ; preds = %cond.end4
  call void @foo()
  br label %if.end

if.end:                                           ; preds = %if.then, %cond.end4
  ret void

}


define void @unfold2(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @unfold2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SUB:%.*]] = sub nsw i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[SUB]], 10
; CHECK-NEXT:    br i1 [[CMP]], label [[IF_END:%.*]], label [[COND_FALSE:%.*]]
; CHECK:       cond.false:
; CHECK-NEXT:    [[ADD:%.*]] = add nsw i32 [[X]], [[Y]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp sgt i32 [[ADD]], 10
; CHECK-NEXT:    br i1 [[CMP1]], label [[IF_THEN:%.*]], label [[COND_END4:%.*]]
; CHECK:       cond.end4:
; CHECK-NEXT:    [[COND5:%.*]] = phi i32 [ [[ADD]], [[COND_FALSE]] ]
; CHECK-NEXT:    [[CMP6:%.*]] = icmp eq i32 [[COND5]], 0
; CHECK-NEXT:    br i1 [[CMP6]], label [[IF_THEN]], label [[IF_END]]
; CHECK:       if.then:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[IF_END]]
; CHECK:       if.end:
; CHECK-NEXT:    ret void
;
entry:
  %sub = sub nsw i32 %x, %y
  %cmp = icmp sgt i32 %sub, 10
  br i1 %cmp, label %cond.end4, label %cond.false

cond.false:                                       ; preds = %entry
  %add = add nsw i32 %x, %y
  %cmp1 = icmp sgt i32 %add, 10
  %add. = select i1 %cmp1, i32 0, i32 %add
  br label %cond.end4

cond.end4:                                        ; preds = %entry, %cond.false
  %cond5 = phi i32 [ %add., %cond.false ], [ %sub, %entry ]
  %cmp6 = icmp eq i32 %cond5, 0
  br i1 %cmp6, label %if.then, label %if.end

if.then:                                          ; preds = %cond.end4
  call void @foo()
  br label %if.end

if.end:                                           ; preds = %if.then, %cond.end4
  ret void

}


define i32 @unfold3(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
; CHECK-LABEL: @unfold3(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[ADD3:%.*]] = add nsw i32 [[J:%.*]], 2
; CHECK-NEXT:    [[CMP_I:%.*]] = icmp slt i32 [[U:%.*]], [[V:%.*]]
; CHECK-NEXT:    br i1 [[CMP_I]], label [[DOTEXIT_THREAD4:%.*]], label [[COND_FALSE_I:%.*]]
; CHECK:       cond.false.i:
; CHECK-NEXT:    [[CMP4_I:%.*]] = icmp sgt i32 [[U]], [[V]]
; CHECK-NEXT:    br i1 [[CMP4_I]], label [[DOTEXIT_THREAD:%.*]], label [[COND_FALSE_6_I:%.*]]
; CHECK:       cond.false.6.i:
; CHECK-NEXT:    [[CMP8_I:%.*]] = icmp slt i32 [[W:%.*]], [[X:%.*]]
; CHECK-NEXT:    br i1 [[CMP8_I]], label [[DOTEXIT_THREAD4]], label [[COND_FALSE_10_I:%.*]]
; CHECK:       cond.false.10.i:
; CHECK-NEXT:    [[CMP13_I:%.*]] = icmp sgt i32 [[W]], [[X]]
; CHECK-NEXT:    br i1 [[CMP13_I]], label [[DOTEXIT_THREAD]], label [[DOTEXIT:%.*]]
; CHECK:       .exit:
; CHECK-NEXT:    [[PHITMP:%.*]] = icmp sge i32 [[Y:%.*]], [[Z:%.*]]
; CHECK-NEXT:    [[COND_FR:%.*]] = freeze i1 [[PHITMP]]
; CHECK-NEXT:    br i1 [[COND_FR]], label [[DOTEXIT_THREAD]], label [[DOTEXIT_THREAD4]]
; CHECK:       .exit.thread:
; CHECK-NEXT:    br label [[DOTEXIT_THREAD4]]
; CHECK:       .exit.thread4:
; CHECK-NEXT:    [[TMP0:%.*]] = phi i32 [ [[J]], [[DOTEXIT_THREAD]] ], [ [[ADD3]], [[DOTEXIT]] ], [ [[ADD3]], [[ENTRY:%.*]] ], [ [[ADD3]], [[COND_FALSE_6_I]] ]
; CHECK-NEXT:    ret i32 [[TMP0]]
;
entry:
  %add3 = add nsw i32 %j, 2
  %cmp.i = icmp slt i32 %u, %v
  br i1 %cmp.i, label %.exit, label %cond.false.i

cond.false.i:                                     ; preds = %entry
  %cmp4.i = icmp sgt i32 %u, %v
  br i1 %cmp4.i, label %.exit, label %cond.false.6.i

cond.false.6.i:                                   ; preds = %cond.false.i
  %cmp8.i = icmp slt i32 %w, %x
  br i1 %cmp8.i, label %.exit, label %cond.false.10.i

cond.false.10.i:                                  ; preds = %cond.false.6.i
  %cmp13.i = icmp sgt i32 %w, %x
  br i1 %cmp13.i, label %.exit, label %cond.false.15.i

cond.false.15.i:                                  ; preds = %cond.false.10.i
  %phitmp = icmp sge i32 %y, %z
  br label %.exit

.exit:                                  ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
  %cond23.i = phi i1 [ false, %entry ], [ true, %cond.false.i ], [ false, %cond.false.6.i ], [ %phitmp, %cond.false.15.i ], [ true, %cond.false.10.i ]
  %j.add3 = select i1 %cond23.i, i32 %j, i32 %add3
  ret i32 %j.add3

}

define i32 @unfold4(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
; CHECK-LABEL: @unfold4(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[ADD3:%.*]] = add nsw i32 [[J:%.*]], 2
; CHECK-NEXT:    [[CMP_I:%.*]] = icmp slt i32 [[U:%.*]], [[V:%.*]]
; CHECK-NEXT:    br i1 [[CMP_I]], label [[DOTEXIT_THREAD:%.*]], label [[COND_FALSE_I:%.*]]
; CHECK:       cond.false.i:
; CHECK-NEXT:    [[CMP4_I:%.*]] = icmp sgt i32 [[U]], [[V]]
; CHECK-NEXT:    br i1 [[CMP4_I]], label [[DOTEXIT_THREAD5:%.*]], label [[COND_FALSE_6_I:%.*]]
; CHECK:       cond.false.6.i:
; CHECK-NEXT:    [[CMP8_I:%.*]] = icmp slt i32 [[W:%.*]], [[X:%.*]]
; CHECK-NEXT:    br i1 [[CMP8_I]], label [[DOTEXIT_THREAD]], label [[COND_FALSE_10_I:%.*]]
; CHECK:       cond.false.10.i:
; CHECK-NEXT:    [[CMP13_I:%.*]] = icmp sgt i32 [[W]], [[X]]
; CHECK-NEXT:    br i1 [[CMP13_I]], label [[DOTEXIT_THREAD5]], label [[DOTEXIT:%.*]]
; CHECK:       .exit:
; CHECK-NEXT:    [[CMP19_I:%.*]] = icmp sge i32 [[Y:%.*]], [[Z:%.*]]
; CHECK-NEXT:    [[CONV:%.*]] = zext i1 [[CMP19_I]] to i32
; CHECK-NEXT:    [[LNOT_I18:%.*]] = icmp eq i32 [[CONV]], 1
; CHECK-NEXT:    [[COND_FR:%.*]] = freeze i1 [[LNOT_I18]]
; CHECK-NEXT:    br i1 [[COND_FR]], label [[DOTEXIT_THREAD]], label [[DOTEXIT_THREAD5]]
; CHECK:       .exit.thread:
; CHECK-NEXT:    br label [[DOTEXIT_THREAD5]]
; CHECK:       .exit.thread5:
; CHECK-NEXT:    [[TMP0:%.*]] = phi i32 [ [[J]], [[DOTEXIT_THREAD]] ], [ [[ADD3]], [[DOTEXIT]] ], [ [[ADD3]], [[COND_FALSE_I]] ], [ [[ADD3]], [[COND_FALSE_10_I]] ]
; CHECK-NEXT:    ret i32 [[TMP0]]
;
entry:
  %add3 = add nsw i32 %j, 2
  %cmp.i = icmp slt i32 %u, %v
  br i1 %cmp.i, label %.exit, label %cond.false.i

cond.false.i:                                     ; preds = %entry
  %cmp4.i = icmp sgt i32 %u, %v
  br i1 %cmp4.i, label %.exit, label %cond.false.6.i

cond.false.6.i:                                   ; preds = %cond.false.i
  %cmp8.i = icmp slt i32 %w, %x
  br i1 %cmp8.i, label %.exit, label %cond.false.10.i

cond.false.10.i:                                  ; preds = %cond.false.6.i
  %cmp13.i = icmp sgt i32 %w, %x
  br i1 %cmp13.i, label %.exit, label %cond.false.15.i

cond.false.15.i:                                  ; preds = %cond.false.10.i
  %cmp19.i = icmp sge i32 %y, %z
  %conv = zext i1 %cmp19.i to i32
  br label %.exit

.exit:                                  ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
  %cond23.i = phi i32 [ 1, %entry ], [ 0, %cond.false.i ], [ 1, %cond.false.6.i ], [ %conv, %cond.false.15.i ], [ 0, %cond.false.10.i ]
  %lnot.i18 = icmp eq i32 %cond23.i, 1
  %j.add3 = select i1 %lnot.i18, i32 %j, i32 %add3
  ret i32 %j.add3

}

define i32 @unfold5(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
; CHECK-LABEL: @unfold5(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[ADD3:%.*]] = add nsw i32 [[J:%.*]], 2
; CHECK-NEXT:    [[CMP_I:%.*]] = icmp slt i32 [[U:%.*]], [[V:%.*]]
; CHECK-NEXT:    br i1 [[CMP_I]], label [[DOTEXIT:%.*]], label [[COND_FALSE_I:%.*]]
; CHECK:       cond.false.i:
; CHECK-NEXT:    [[CMP4_I:%.*]] = icmp sgt i32 [[U]], [[V]]
; CHECK-NEXT:    br i1 [[CMP4_I]], label [[DOTEXIT]], label [[COND_FALSE_6_I:%.*]]
; CHECK:       cond.false.6.i:
; CHECK-NEXT:    [[CMP8_I:%.*]] = icmp slt i32 [[W:%.*]], [[X:%.*]]
; CHECK-NEXT:    br i1 [[CMP8_I]], label [[DOTEXIT]], label [[COND_FALSE_10_I:%.*]]
; CHECK:       cond.false.10.i:
; CHECK-NEXT:    [[CMP13_I:%.*]] = icmp sgt i32 [[W]], [[X]]
; CHECK-NEXT:    br i1 [[CMP13_I]], label [[DOTEXIT]], label [[COND_FALSE_15_I:%.*]]
; CHECK:       cond.false.15.i:
; CHECK-NEXT:    [[CMP19_I:%.*]] = icmp sge i32 [[Y:%.*]], [[Z:%.*]]
; CHECK-NEXT:    [[CONV:%.*]] = zext i1 [[CMP19_I]] to i32
; CHECK-NEXT:    br label [[DOTEXIT]]
; CHECK:       .exit:
; CHECK-NEXT:    [[TMP0:%.*]] = phi i32 [ [[J]], [[COND_FALSE_10_I]] ], [ [[CONV]], [[COND_FALSE_15_I]] ], [ 1, [[COND_FALSE_6_I]] ], [ 3, [[COND_FALSE_I]] ], [ 2, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i32 [[TMP0]]
;
entry:
  %add3 = add nsw i32 %j, 2
  %cmp.i = icmp slt i32 %u, %v
  br i1 %cmp.i, label %.exit, label %cond.false.i

cond.false.i:                                     ; preds = %entry
  %cmp4.i = icmp sgt i32 %u, %v
  br i1 %cmp4.i, label %.exit, label %cond.false.6.i

cond.false.6.i:                                   ; preds = %cond.false.i
  %cmp8.i = icmp slt i32 %w, %x
  br i1 %cmp8.i, label %.exit, label %cond.false.10.i

cond.false.10.i:                                  ; preds = %cond.false.6.i
  %cmp13.i = icmp sgt i32 %w, %x
  br i1 %cmp13.i, label %.exit, label %cond.false.15.i

cond.false.15.i:                                  ; preds = %cond.false.10.i
  %cmp19.i = icmp sge i32 %y, %z
  %conv = zext i1 %cmp19.i to i32
  br label %.exit

.exit:                                  ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
  %cond23.i = phi i32 [ 2, %entry ], [ 3, %cond.false.i ], [ 1, %cond.false.6.i ], [ %conv, %cond.false.15.i ], [ 7, %cond.false.10.i ]
  %lnot.i18 = icmp sgt i32 %cond23.i, 5
  %j.add3 = select i1 %lnot.i18, i32 %j, i32 %cond23.i
  ret i32 %j.add3

}

; When a select has a constant operand in one branch, and it feeds a phi node
; and the phi node feeds a switch we unfold the select
define void @test_func(i32* nocapture readonly %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %n) local_unnamed_addr #0 {
; CHECK-LABEL: @test_func(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_COND:%.*]]
; CHECK:       for.cond:
; CHECK-NEXT:    [[I_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[SW_DEFAULT:%.*]] ]
; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[I_0]], [[N:%.*]]
; CHECK-NEXT:    br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[FOR_COND_CLEANUP:%.*]]
; CHECK:       for.cond.cleanup:
; CHECK-NEXT:    ret void
; CHECK:       for.body:
; CHECK-NEXT:    [[TMP0:%.*]] = zext i32 [[I_0]] to i64
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[A:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[TMP1:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i32 [[TMP1]], 4
; CHECK-NEXT:    br i1 [[CMP1]], label [[LAND_LHS_TRUE:%.*]], label [[IF_END:%.*]]
; CHECK:       land.lhs.true:
; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds i32, i32* [[B:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[TMP2:%.*]] = load i32, i32* [[ARRAYIDX3]], align 4
; CHECK-NEXT:    [[ARRAYIDX5:%.*]] = getelementptr inbounds i32, i32* [[C:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[TMP3:%.*]] = load i32, i32* [[ARRAYIDX5]], align 4
; CHECK-NEXT:    [[CMP6:%.*]] = icmp eq i32 [[TMP2]], [[TMP3]]
; CHECK-NEXT:    br i1 [[CMP6]], label [[SW_BB:%.*]], label [[SW_BB7:%.*]]
; CHECK:       if.end:
; CHECK-NEXT:    [[LOCAL_VAR_0:%.*]] = phi i32 [ [[TMP1]], [[FOR_BODY]] ]
; CHECK-NEXT:    switch i32 [[LOCAL_VAR_0]], label [[SW_DEFAULT]] [
; CHECK-NEXT:    i32 2, label [[SW_BB]]
; CHECK-NEXT:    i32 4, label [[SW_BB7]]
; CHECK-NEXT:    i32 5, label [[SW_BB8:%.*]]
; CHECK-NEXT:    i32 7, label [[SW_BB9:%.*]]
; CHECK-NEXT:    ]
; CHECK:       sw.bb:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[SW_BB7]]
; CHECK:       sw.bb7:
; CHECK-NEXT:    call void @bar()
; CHECK-NEXT:    br label [[SW_BB8]]
; CHECK:       sw.bb8:
; CHECK-NEXT:    call void @baz()
; CHECK-NEXT:    br label [[SW_BB9]]
; CHECK:       sw.bb9:
; CHECK-NEXT:    call void @quux()
; CHECK-NEXT:    br label [[SW_DEFAULT]]
; CHECK:       sw.default:
; CHECK-NEXT:    call void @baz()
; CHECK-NEXT:    [[INC]] = add nuw nsw i32 [[I_0]], 1
; CHECK-NEXT:    br label [[FOR_COND]]
;
entry:
  br label %for.cond

for.cond:                                         ; preds = %sw.default, %entry
  %i.0 = phi i32 [ 0, %entry ], [ %inc, %sw.default ]
  %cmp = icmp slt i32 %i.0, %n
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:                                 ; preds = %for.cond
  ret void

for.body:                                         ; preds = %for.cond
  %0 = zext i32 %i.0 to i64
  %arrayidx = getelementptr inbounds i32, i32* %a, i64 %0
  %1 = load i32, i32* %arrayidx, align 4
  %cmp1 = icmp eq i32 %1, 4
  br i1 %cmp1, label %land.lhs.true, label %if.end

land.lhs.true:                                    ; preds = %for.body
  %arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %0
  %2 = load i32, i32* %arrayidx3, align 4
  %arrayidx5 = getelementptr inbounds i32, i32* %c, i64 %0
  %3 = load i32, i32* %arrayidx5, align 4
  %cmp6 = icmp eq i32 %2, %3
  %spec.select = select i1 %cmp6, i32 2, i32 4
  br label %if.end

if.end:                                           ; preds = %land.lhs.true, %for.body
  %local_var.0 = phi i32 [ %1, %for.body ], [ %spec.select, %land.lhs.true ]
  switch i32 %local_var.0, label %sw.default [
  i32 2, label %sw.bb
  i32 4, label %sw.bb7
  i32 5, label %sw.bb8
  i32 7, label %sw.bb9
  ]

sw.bb:                                            ; preds = %if.end
  call void @foo()
  br label %sw.bb7

sw.bb7:                                           ; preds = %if.end, %sw.bb
  call void @bar()
  br label %sw.bb8

sw.bb8:                                           ; preds = %if.end, %sw.bb7
  call void @baz()
  br label %sw.bb9

sw.bb9:                                           ; preds = %if.end, %sw.bb8
  call void @quux()
  br label %sw.default

sw.default:                                       ; preds = %if.end, %sw.bb9
  call void @baz()
  %inc = add nuw nsw i32 %i.0, 1
  br label %for.cond
}

define i32 @TryToUnfoldSelectInCurrBB(i1 %b, i1 %ui, i32 %s, i1 %x) {
; CHECK-LABEL: @TryToUnfoldSelectInCurrBB(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[B:%.*]], label [[IF_END_THREAD:%.*]], label [[IF_END:%.*]]
; CHECK:       if.end:
; CHECK-NEXT:    [[COND_FR:%.*]] = freeze i1 [[X:%.*]]
; CHECK-NEXT:    br i1 [[COND_FR]], label [[TMP0:%.*]], label [[IF_END_THREAD]]
; CHECK:       0:
; CHECK-NEXT:    br label [[IF_END_THREAD]]
; CHECK:       if.end.thread:
; CHECK-NEXT:    [[TMP1:%.*]] = phi i32 [ [[S:%.*]], [[TMP0]] ], [ 42, [[IF_END]] ], [ 42, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i32 [[TMP1]]
;
entry:
  br i1 %b, label %if.end, label %if.else

if.else:
  br label %if.end

if.end:
  %v = phi i1 [ %x, %if.else ], [ false, %entry ]
  %v1 = select i1 %v, i32 %s, i32 42
  ret i32 %v1
}