llvm/test/Transforms/LoopPredication/predicate-exits.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=loop-predication -S | FileCheck %s
; RUN: opt -S -passes='require<scalar-evolution>,loop-mssa(loop-predication)' -verify-memoryssa < %s 2>&1 | FileCheck %s

declare void @prevent_merging()

; Base case - with side effects in loop
define i32 @test1(ptr %array, i32 %length, i32 %n, i1 %cond_0) {
; CHECK-LABEL: @test1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[TMP0:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[N:%.*]], i32 1)
; CHECK-NEXT:    [[UMIN:%.*]] = call i32 @llvm.umin.i32(i32 [[LENGTH:%.*]], i32 [[TMP0]])
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ugt i32 [[LENGTH]], [[UMIN]]
; CHECK-NEXT:    [[TMP2:%.*]] = freeze i1 [[TMP1]]
; CHECK-NEXT:    [[TMP3:%.*]] = and i1 [[TMP2]], [[COND_0:%.*]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP3]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0:![0-9]+]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LENGTH]]
; CHECK-NEXT:    br i1 true, label [[GUARDED]], label [[DEOPT2:%.*]], !prof [[PROF0]]
; CHECK:       deopt2:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET2]]
; CHECK:       guarded:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, %length
  br i1 %within.bounds, label %guarded, label %deopt2, !prof !0

deopt2:
  call void @unknown()
  %deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret2

guarded:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %continue = icmp ult i32 %i.next, %n
  br i1 %continue, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded ]
  ret i32 %result
}



define i32 @test_non_canonical(ptr %array, i32 %length, i1 %cond_0) {
; CHECK-LABEL: @test_non_canonical(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[UMIN:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[LENGTH:%.*]], i32 1)
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ugt i32 [[LENGTH]], [[UMIN]]
; CHECK-NEXT:    [[TMP2:%.*]] = freeze i1 [[TMP1]]
; CHECK-NEXT:    [[TMP3:%.*]] = and i1 [[TMP2]], [[COND_0:%.*]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP3]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LENGTH]]
; CHECK-NEXT:    br i1 true, label [[GUARDED]], label [[DEOPT2:%.*]], !prof [[PROF0]]
; CHECK:       deopt2:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET2]]
; CHECK:       guarded:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[LENGTH]]
; CHECK-NEXT:    br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, %length
  br i1 %within.bounds, label %guarded, label %deopt2, !prof !0

deopt2:
  call void @unknown()
  %deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret2

guarded:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %continue = icmp ult i32 %i.next, %length
  br i1 %continue, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded ]
  ret i32 %result
}


define i32 @test_two_range_checks(ptr %array, i32 %length.1, i32 %length.2, i32 %n, i1 %cond_0) {
; CHECK-LABEL: @test_two_range_checks(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[UMIN:%.*]] = call i32 @llvm.umin.i32(i32 [[LENGTH_2:%.*]], i32 [[LENGTH_1:%.*]])
; CHECK-NEXT:    [[TMP0:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[N:%.*]], i32 1)
; CHECK-NEXT:    [[UMIN1:%.*]] = call i32 @llvm.umin.i32(i32 [[UMIN]], i32 [[TMP0]])
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ugt i32 [[LENGTH_1]], [[UMIN1]]
; CHECK-NEXT:    [[TMP2:%.*]] = freeze i1 [[TMP1]]
; CHECK-NEXT:    [[TMP3:%.*]] = and i1 [[TMP2]], [[COND_0:%.*]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp ugt i32 [[LENGTH_2]], [[UMIN1]]
; CHECK-NEXT:    [[TMP5:%.*]] = freeze i1 [[TMP4]]
; CHECK-NEXT:    [[TMP6:%.*]] = and i1 [[TMP5]], [[TMP3]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP6]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED2:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED2]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LENGTH_1]]
; CHECK-NEXT:    br i1 true, label [[GUARDED:%.*]], label [[DEOPT2:%.*]], !prof [[PROF0]]
; CHECK:       deopt2:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET2]]
; CHECK:       guarded:
; CHECK-NEXT:    [[WITHIN_BOUNDS2:%.*]] = icmp ult i32 [[I]], [[LENGTH_2]]
; CHECK-NEXT:    br i1 true, label [[GUARDED2]], label [[DEOPT3:%.*]], !prof [[PROF0]]
; CHECK:       deopt3:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET3:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET3]]
; CHECK:       guarded2:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED2]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded2 ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded2 ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, %length.1
  br i1 %within.bounds, label %guarded, label %deopt2, !prof !0

deopt2:
  call void @unknown()
  %deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret2

guarded:
  %within.bounds2 = icmp ult i32 %i, %length.2
  br i1 %within.bounds2, label %guarded2, label %deopt3, !prof !0

deopt3:
  call void @unknown()
  %deoptret3 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret3

guarded2:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %continue = icmp ult i32 %i.next, %n
  br i1 %continue, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded2 ]
  ret i32 %result
}

@G = external global i32

define i32 @test_unanalyzeable_exit(ptr %array, i32 %length, i32 %n, i1 %cond_0) {
; CHECK-LABEL: @test_unanalyzeable_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED2:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED2]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[VOL:%.*]] = load volatile i32, ptr @G, align 4
; CHECK-NEXT:    [[UNKNOWN:%.*]] = icmp eq i32 [[VOL]], 0
; CHECK-NEXT:    br i1 [[UNKNOWN]], label [[GUARDED2]], label [[DEOPT3:%.*]], !prof [[PROF0]]
; CHECK:       deopt3:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET3:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET3]]
; CHECK:       guarded2:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N:%.*]]
; CHECK-NEXT:    br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED2]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded2 ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded2 ], [ 0, %loop.preheader ]
  call void @unknown()
  %vol = load volatile i32, ptr @G
  %unknown = icmp eq i32 %vol, 0
  br i1 %unknown, label %guarded2, label %deopt3, !prof !0

deopt3:
  call void @unknown()
  %deoptret3 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret3

guarded2:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %continue = icmp ult i32 %i.next, %n
  br i1 %continue, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded2 ]
  ret i32 %result
}

define i32 @test_unanalyzeable_exit2(ptr %array, i32 %length, i32 %n, i1 %cond_0) {
; CHECK-LABEL: @test_unanalyzeable_exit2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[TMP0:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[N:%.*]], i32 1)
; CHECK-NEXT:    [[UMIN:%.*]] = call i32 @llvm.umin.i32(i32 [[LENGTH:%.*]], i32 [[TMP0]])
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ugt i32 [[LENGTH]], [[UMIN]]
; CHECK-NEXT:    [[TMP2:%.*]] = freeze i1 [[TMP1]]
; CHECK-NEXT:    [[TMP3:%.*]] = and i1 [[TMP2]], [[COND_0:%.*]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP3]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED2:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED2]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LENGTH]]
; CHECK-NEXT:    br i1 true, label [[GUARDED:%.*]], label [[DEOPT2:%.*]], !prof [[PROF0]]
; CHECK:       deopt2:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET2]]
; CHECK:       guarded:
; CHECK-NEXT:    [[VOL:%.*]] = load volatile i32, ptr @G, align 4
; CHECK-NEXT:    [[UNKNOWN:%.*]] = icmp eq i32 [[VOL]], 0
; CHECK-NEXT:    br i1 [[UNKNOWN]], label [[GUARDED2]], label [[DEOPT3:%.*]], !prof [[PROF0]]
; CHECK:       deopt3:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET3:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET3]]
; CHECK:       guarded2:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED2]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded2 ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded2 ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, %length
  br i1 %within.bounds, label %guarded, label %deopt2, !prof !0

deopt2:
  call void @unknown()
  %deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret2

guarded:
  %vol = load volatile i32, ptr @G
  %unknown = icmp eq i32 %vol, 0
  br i1 %unknown, label %guarded2, label %deopt3, !prof !0

deopt3:
  call void @unknown()
  %deoptret3 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret3

guarded2:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %continue = icmp ult i32 %i.next, %n
  br i1 %continue, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded2 ]
  ret i32 %result
}


define i32 @test_unanalyzeable_latch(ptr %array, i32 %length, i32 %n, i1 %cond_0) {
; CHECK-LABEL: @test_unanalyzeable_latch(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LENGTH:%.*]]
; CHECK-NEXT:    br i1 [[WITHIN_BOUNDS]], label [[GUARDED]], label [[DEOPT2:%.*]], !prof [[PROF0]]
; CHECK:       deopt2:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET2]]
; CHECK:       guarded:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[VOL:%.*]] = load volatile i32, ptr @G, align 4
; CHECK-NEXT:    [[UNKNOWN:%.*]] = icmp eq i32 [[VOL]], 0
; CHECK-NEXT:    br i1 [[UNKNOWN]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, %length
  br i1 %within.bounds, label %guarded, label %deopt2, !prof !0

deopt2:
  call void @unknown()
  %deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret2

guarded:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %vol = load volatile i32, ptr @G
  %unknown = icmp eq i32 %vol, 0
  br i1 %unknown, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded ]
  ret i32 %result
}


define i32 @provably_taken(ptr %array, i1 %cond_0) {
; CHECK-LABEL: @provably_taken(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[TMP0:%.*]] = freeze i1 false
; CHECK-NEXT:    [[TMP1:%.*]] = and i1 [[TMP0]], [[COND_0:%.*]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP1]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], 198
; CHECK-NEXT:    br i1 true, label [[GUARDED]], label [[DEOPT2:%.*]], !prof [[PROF0]]
; CHECK:       deopt2:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET2]]
; CHECK:       guarded:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], 200
; CHECK-NEXT:    br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, 198
  br i1 %within.bounds, label %guarded, label %deopt2, !prof !0

deopt2:
  call void @unknown()
  %deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret2

guarded:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %continue = icmp ult i32 %i.next, 200
  br i1 %continue, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded ]
  ret i32 %result
}

define i32 @provably_not_taken(ptr %array, i1 %cond_0) {
; CHECK-LABEL: @provably_not_taken(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[TMP0:%.*]] = freeze i1 true
; CHECK-NEXT:    [[TMP1:%.*]] = and i1 [[TMP0]], [[COND_0:%.*]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP1]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], 205
; CHECK-NEXT:    br i1 true, label [[GUARDED]], label [[DEOPT2:%.*]], !prof [[PROF0]]
; CHECK:       deopt2:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET2]]
; CHECK:       guarded:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], 200
; CHECK-NEXT:    br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, 205
  br i1 %within.bounds, label %guarded, label %deopt2, !prof !0

deopt2:
  call void @unknown()
  %deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret2

guarded:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %continue = icmp ult i32 %i.next, 200
  br i1 %continue, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded ]
  ret i32 %result
}


;; Unswitch likes to produce some ugly exit blocks without simplifications
;; being applied.  Make sure we can handle that form.
define i32 @unswitch_exit_form(ptr %array, i32 %length, i32 %n, i1 %cond_0) {
; CHECK-LABEL: @unswitch_exit_form(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[TMP0:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[N:%.*]], i32 1)
; CHECK-NEXT:    [[UMIN:%.*]] = call i32 @llvm.umin.i32(i32 [[LENGTH:%.*]], i32 [[TMP0]])
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ugt i32 [[LENGTH]], [[UMIN]]
; CHECK-NEXT:    [[TMP2:%.*]] = freeze i1 [[TMP1]]
; CHECK-NEXT:    [[TMP3:%.*]] = and i1 [[TMP2]], [[COND_0:%.*]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP3]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt.loopexit:
; CHECK-NEXT:    br label [[DEOPT]]
; CHECK:       deopt:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ 1, [[DEOPT_LOOPEXIT:%.*]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    br label [[ACTUAL_DEOPT:%.*]]
; CHECK:       actual_deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[PHI]]) ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LENGTH]]
; CHECK-NEXT:    br i1 true, label [[GUARDED]], label [[DEOPT_LOOPEXIT]], !prof [[PROF0]]
; CHECK:       guarded:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  ;; This is written to look like an unsimplified loop exit after unswitch
  ;; (i.e. phis, merge, and branch to actual block)
  %phi = phi i32 [0, %entry], [1, %loop]
  call void @unknown() ;; it's okay to skip possible throws
  br label %actual_deopt

actual_deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %phi) ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, %length
  br i1 %within.bounds, label %guarded, label %deopt, !prof !0

guarded:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %continue = icmp ult i32 %i.next, %n
  br i1 %continue, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded ]
  ret i32 %result
}

define i32 @swapped_wb(ptr %array, i32 %length, i32 %n, i1 %cond_0) {
; CHECK-LABEL: @swapped_wb(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[TMP0:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[N:%.*]], i32 1)
; CHECK-NEXT:    [[UMIN:%.*]] = call i32 @llvm.umin.i32(i32 [[LENGTH:%.*]], i32 [[TMP0]])
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ugt i32 [[LENGTH]], [[UMIN]]
; CHECK-NEXT:    [[TMP2:%.*]] = freeze i1 [[TMP1]]
; CHECK-NEXT:    [[TMP3:%.*]] = and i1 [[TMP2]], [[COND_0:%.*]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[WIDENABLE_COND]], [[TMP3]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LENGTH]]
; CHECK-NEXT:    br i1 true, label [[GUARDED]], label [[DEOPT2:%.*]], !prof [[PROF0]]
; CHECK:       deopt2:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET2]]
; CHECK:       guarded:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %widenable_cond, %cond_0
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, %length
  br i1 %within.bounds, label %guarded, label %deopt2, !prof !0

deopt2:
  call void @unknown()
  %deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret2

guarded:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %continue = icmp ult i32 %i.next, %n
  br i1 %continue, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded ]
  ret i32 %result
}

define i32 @trivial_wb(ptr %array, i32 %length, i32 %n) {
; CHECK-LABEL: @trivial_wb(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[TMP0:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[N:%.*]], i32 1)
; CHECK-NEXT:    [[UMIN:%.*]] = call i32 @llvm.umin.i32(i32 [[LENGTH:%.*]], i32 [[TMP0]])
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ugt i32 [[LENGTH]], [[UMIN]]
; CHECK-NEXT:    [[TMP2:%.*]] = freeze i1 [[TMP1]]
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[TMP3:%.*]] = and i1 [[TMP2]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[TMP3]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LENGTH]]
; CHECK-NEXT:    br i1 true, label [[GUARDED]], label [[DEOPT2:%.*]], !prof [[PROF0]]
; CHECK:       deopt2:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET2]]
; CHECK:       guarded:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  br i1 %widenable_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, %length
  br i1 %within.bounds, label %guarded, label %deopt2, !prof !0

deopt2:
  call void @unknown()
  %deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret2

guarded:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %continue = icmp ult i32 %i.next, %n
  br i1 %continue, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded ]
  ret i32 %result
}

; TODO: Non-latch exits can still be predicated
; This is currently prevented by an overly restrictive profitability check.
define i32 @todo_unconditional_latch(ptr %array, i32 %length, i1 %cond_0) {
; CHECK-LABEL: @todo_unconditional_latch(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[COND_0:%.*]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LENGTH:%.*]]
; CHECK-NEXT:    br i1 [[WITHIN_BOUNDS]], label [[GUARDED]], label [[DEOPT2:%.*]], !prof [[PROF0]]
; CHECK:       deopt2:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET2]]
; CHECK:       guarded:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    br label [[LOOP]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, %length
  br i1 %within.bounds, label %guarded, label %deopt2, !prof !0

deopt2:
  call void @unknown()
  %deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret2

guarded:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  br label %loop
}


; If we have a stray widenable branch in the loop, we should still be able to
; run.  This can happen when unswitching's cost model avoids unswitching some
; branches.
define i32 @wb_in_loop(ptr %array, i32 %length, i32 %n, i1 %cond_0) {
; CHECK-LABEL: @wb_in_loop(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[WIDENABLE_COND:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[WC2:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[TMP0:%.*]] = call i32 @llvm.usub.sat.i32(i32 [[N:%.*]], i32 1)
; CHECK-NEXT:    [[UMIN:%.*]] = call i32 @llvm.umin.i32(i32 [[LENGTH:%.*]], i32 [[TMP0]])
; CHECK-NEXT:    [[TMP4:%.*]] = icmp ugt i32 [[LENGTH]], [[UMIN]]
; CHECK-NEXT:    [[TMP5:%.*]] = freeze i1 [[TMP4]]
; CHECK-NEXT:    [[TMP6:%.*]] = and i1 [[TMP5]], [[TMP3:%.*]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP6]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof [[PROF0]]
; CHECK:       deopt:
; CHECK-NEXT:    [[DEOPTRET:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[GUARDED2:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[GUARDED2]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LENGTH]]
; CHECK-NEXT:    br i1 true, label [[GUARDED:%.*]], label [[DEOPT2:%.*]], !prof [[PROF0]]
; CHECK:       deopt2:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET2]]
; CHECK:       guarded:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[WITHIN_BOUNDS2:%.*]] = icmp ult i32 [[I]], [[LENGTH]]
; CHECK-NEXT:    [[WB_COND:%.*]] = and i1 [[WITHIN_BOUNDS2]], true
; CHECK-NEXT:    br i1 [[WB_COND]], label [[GUARDED2]], label [[DEOPT3:%.*]], !prof [[PROF0]]
; CHECK:       deopt3:
; CHECK-NEXT:    call void @unknown()
; CHECK-NEXT:    [[DEOPTRET3:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
; CHECK-NEXT:    ret i32 [[DEOPTRET3]]
; CHECK:       guarded2:
; CHECK-NEXT:    [[I_I64:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT:    [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, ptr [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[GUARDED2]] ]
; CHECK-NEXT:    ret i32 [[RESULT]]
;
entry:
  %widenable_cond = call i1 @llvm.experimental.widenable.condition()
  %wc2 = call i1 @llvm.experimental.widenable.condition()
  %exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
  br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0

deopt:
  %deoptret = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret

loop.preheader:
  br label %loop

loop:
  %loop.acc = phi i32 [ %loop.acc.next, %guarded2 ], [ 0, %loop.preheader ]
  %i = phi i32 [ %i.next, %guarded2 ], [ 0, %loop.preheader ]
  call void @unknown()
  %within.bounds = icmp ult i32 %i, %length
  br i1 %within.bounds, label %guarded, label %deopt2, !prof !0

deopt2:
  call void @unknown()
  %deoptret2 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret2

guarded:
  call void @unknown()
  %within.bounds2 = icmp ult i32 %i, %length
  %wb_cond = and i1 %within.bounds2, %wc2
  br i1 %wb_cond, label %guarded2, label %deopt3, !prof !0

deopt3:
  call void @unknown()
  %deoptret3 = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"() ]
  ret i32 %deoptret3

guarded2:
  %i.i64 = zext i32 %i to i64
  %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64
  %array.i = load i32, ptr %array.i.ptr, align 4
  store i32 0, ptr %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %continue = icmp ult i32 %i.next, %n
  br i1 %continue, label %loop, label %exit

exit:
  %result = phi i32 [ %loop.acc.next, %guarded2 ]
  ret i32 %result
}

define void @test_memssa() {
; CHECK-LABEL: @test_memssa(
; CHECK-NEXT:  bb:
; CHECK-NEXT:    [[TMP:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    [[TMP1:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT:    br i1 [[TMP]], label [[BB3:%.*]], label [[BB2:%.*]]
; CHECK:       bb2:
; CHECK-NEXT:    unreachable
; CHECK:       bb3:
; CHECK-NEXT:    br label [[BB4:%.*]]
; CHECK:       bb4:
; CHECK-NEXT:    [[TMP5:%.*]] = phi i32 [ [[TMP7:%.*]], [[BB6:%.*]] ], [ 0, [[BB3]] ]
; CHECK-NEXT:    br i1 true, label [[BB10:%.*]], label [[BB6]]
; CHECK:       bb6:
; CHECK-NEXT:    [[TMP7]] = add nuw nsw i32 [[TMP5]], 1
; CHECK-NEXT:    [[TMP8:%.*]] = icmp ult i32 [[TMP7]], undef
; CHECK-NEXT:    br i1 [[TMP8]], label [[BB4]], label [[BB9:%.*]]
; CHECK:       bb9:
; CHECK-NEXT:    ret void
; CHECK:       bb10:
; CHECK-NEXT:    ret void
;
bb:
  %tmp = call i1 @llvm.experimental.widenable.condition()
  %tmp1 = call i1 @llvm.experimental.widenable.condition()
  br i1 %tmp, label %bb3, label %bb2

bb2:                                              ; preds = %bb
  unreachable

bb3:                                              ; preds = %bb
  br label %bb4

bb4:                                              ; preds = %bb6, %bb3
  %tmp5 = phi i32 [ %tmp7, %bb6 ], [ 0, %bb3 ]
  br i1 true, label %bb10, label %bb6

bb6:                                              ; preds = %bb4
  %tmp7 = add nuw nsw i32 %tmp5, 1
  %tmp8 = icmp ult i32 %tmp7, undef
  br i1 %tmp8, label %bb4, label %bb9

bb9:                                              ; preds = %bb6
  ret void

bb10:                                             ; preds = %bb4
  ret void
}



declare void @unknown()

declare i1 @llvm.experimental.widenable.condition()
declare i32 @llvm.experimental.deoptimize.i32(...)

!0 = !{!"branch_weights", i32 1048576, i32 1}
!1 = !{i32 1, i32 -2147483648}
!2 = !{i32 0, i32 50}