xref: /llvm-project-15.0.7/llvm/test/Transforms/LoopPredication/predicate-exits.ll (revision ad5a84c8)

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

declare void @prevent_merging()

; Base case - with side effects in loop
define i32 @test1(i32* %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:%.*]] = icmp ugt i32 [[N:%.*]], 1
; CHECK-NEXT:    [[UMAX:%.*]] = select i1 [[TMP0]], i32 [[N]], i32 1
; CHECK-NEXT:    [[TMP1:%.*]] = add i32 [[UMAX]], -1
; CHECK-NEXT:    [[TMP2:%.*]] = icmp ult i32 [[LENGTH:%.*]], [[TMP1]]
; CHECK-NEXT:    [[UMIN:%.*]] = select i1 [[TMP2]], i32 [[LENGTH]], i32 [[TMP1]]
; CHECK-NEXT:    [[TMP3:%.*]] = icmp ugt i32 [[LENGTH]], [[UMIN]]
; CHECK-NEXT:    [[TMP4:%.*]] = freeze i1 [[TMP3]]
; CHECK-NEXT:    [[TMP5:%.*]] = and i1 [[TMP4]], [[COND_0:%.*]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP5]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof !0
; 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 !0
; 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, i32* [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, i32* [[ARRAY_I_PTR]]
; 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, i32* %array, i64 %i.i64
  %array.i = load i32, i32* %array.i.ptr, align 4
  store i32 0, i32* %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(i32* %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:    [[TMP0:%.*]] = icmp ugt i32 [[LENGTH:%.*]], 1
; CHECK-NEXT:    [[UMAX:%.*]] = select i1 [[TMP0]], i32 [[LENGTH]], i32 1
; CHECK-NEXT:    [[TMP1:%.*]] = add i32 [[UMAX]], -1
; CHECK-NEXT:    [[TMP2:%.*]] = icmp ult i32 [[LENGTH]], [[TMP1]]
; CHECK-NEXT:    [[UMIN:%.*]] = select i1 [[TMP2]], i32 [[LENGTH]], i32 [[TMP1]]
; CHECK-NEXT:    [[TMP3:%.*]] = icmp ugt i32 [[LENGTH]], [[UMIN]]
; CHECK-NEXT:    [[TMP4:%.*]] = freeze i1 [[TMP3]]
; CHECK-NEXT:    [[TMP5:%.*]] = and i1 [[TMP4]], [[COND_0:%.*]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP5]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof !0
; 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 !0
; 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, i32* [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, i32* [[ARRAY_I_PTR]]
; 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, i32* %array, i64 %i.i64
  %array.i = load i32, i32* %array.i.ptr, align 4
  store i32 0, i32* %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(i32* %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:    [[TMP0:%.*]] = icmp ult i32 [[LENGTH_2:%.*]], [[LENGTH_1:%.*]]
; CHECK-NEXT:    [[UMIN:%.*]] = select i1 [[TMP0]], i32 [[LENGTH_2]], i32 [[LENGTH_1]]
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ugt i32 [[N:%.*]], 1
; CHECK-NEXT:    [[UMAX:%.*]] = select i1 [[TMP1]], i32 [[N]], i32 1
; CHECK-NEXT:    [[TMP2:%.*]] = add i32 [[UMAX]], -1
; CHECK-NEXT:    [[TMP3:%.*]] = icmp ult i32 [[UMIN]], [[TMP2]]
; CHECK-NEXT:    [[UMIN1:%.*]] = select i1 [[TMP3]], i32 [[UMIN]], i32 [[TMP2]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp ugt i32 [[LENGTH_1]], [[UMIN1]]
; CHECK-NEXT:    [[TMP5:%.*]] = freeze i1 [[TMP4]]
; CHECK-NEXT:    [[TMP6:%.*]] = and i1 [[TMP5]], [[COND_0:%.*]]
; CHECK-NEXT:    [[TMP7:%.*]] = icmp ugt i32 [[LENGTH_2]], [[UMIN1]]
; CHECK-NEXT:    [[TMP8:%.*]] = freeze i1 [[TMP7]]
; CHECK-NEXT:    [[TMP9:%.*]] = and i1 [[TMP8]], [[TMP6]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP9]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof !0
; 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 !0
; 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 !0
; 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, i32* [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, i32* [[ARRAY_I_PTR]]
; 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, i32* %array, i64 %i.i64
  %array.i = load i32, i32* %array.i.ptr, align 4
  store i32 0, i32* %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(i32* %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 !0
; 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, i32* @G
; CHECK-NEXT:    [[UNKNOWN:%.*]] = icmp eq i32 [[VOL]], 0
; CHECK-NEXT:    br i1 [[UNKNOWN]], label [[GUARDED2]], label [[DEOPT3:%.*]], !prof !0
; 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, i32* [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, i32* [[ARRAY_I_PTR]]
; 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, i32* @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, i32* %array, i64 %i.i64
  %array.i = load i32, i32* %array.i.ptr, align 4
  store i32 0, i32* %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(i32* %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:%.*]] = icmp ugt i32 [[N:%.*]], 1
; CHECK-NEXT:    [[UMAX:%.*]] = select i1 [[TMP0]], i32 [[N]], i32 1
; CHECK-NEXT:    [[TMP1:%.*]] = add i32 [[UMAX]], -1
; CHECK-NEXT:    [[TMP2:%.*]] = icmp ult i32 [[LENGTH:%.*]], [[TMP1]]
; CHECK-NEXT:    [[UMIN:%.*]] = select i1 [[TMP2]], i32 [[LENGTH]], i32 [[TMP1]]
; CHECK-NEXT:    [[TMP3:%.*]] = icmp ugt i32 [[LENGTH]], [[UMIN]]
; CHECK-NEXT:    [[TMP4:%.*]] = freeze i1 [[TMP3]]
; CHECK-NEXT:    [[TMP5:%.*]] = and i1 [[TMP4]], [[COND_0:%.*]]
; CHECK-NEXT:    [[EXIPLICIT_GUARD_COND:%.*]] = and i1 [[TMP5]], [[WIDENABLE_COND]]
; CHECK-NEXT:    br i1 [[EXIPLICIT_GUARD_COND]], label [[LOOP_PREHEADER:%.*]], label [[DEOPT:%.*]], !prof !0
; 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 !0
; 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, i32* @G
; CHECK-NEXT:    [[UNKNOWN:%.*]] = icmp eq i32 [[VOL]], 0
; CHECK-NEXT:    br i1 [[UNKNOWN]], label [[GUARDED2]], label [[DEOPT3:%.*]], !prof !0
; 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, i32* [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, i32* [[ARRAY_I_PTR]]
; 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, i32* @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, i32* %array, i64 %i.i64
  %array.i = load i32, i32* %array.i.ptr, align 4
  store i32 0, i32* %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(i32* %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 !0
; 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 !0
; 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, i32* [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, i32* [[ARRAY_I_PTR]]
; 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, i32* @G
; 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, i32* %array, i64 %i.i64
  %array.i = load i32, i32* %array.i.ptr, align 4
  store i32 0, i32* %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  %vol = load volatile i32, i32* @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(i32* %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 !0
; 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 !0
; 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, i32* [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, i32* [[ARRAY_I_PTR]]
; 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, i32* %array, i64 %i.i64
  %array.i = load i32, i32* %array.i.ptr, align 4
  store i32 0, i32* %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(i32* %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 !0
; 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 !0
; 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, i32* [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, i32* [[ARRAY_I_PTR]]
; 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, i32* %array, i64 %i.i64
  %array.i = load i32, i32* %array.i.ptr, align 4
  store i32 0, i32* %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
}








; TODO: Non-latch exits can still be predicated
; This is currently prevented by an overly restrictive profitability check.
define i32 @todo_unconditional_latch(i32* %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 !0
; 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 !0
; 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, i32* [[ARRAY:%.*]], i64 [[I_I64]]
; CHECK-NEXT:    [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4
; CHECK-NEXT:    store i32 0, i32* [[ARRAY_I_PTR]]
; 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, i32* %array, i64 %i.i64
  %array.i = load i32, i32* %array.i.ptr, align 4
  store i32 0, i32* %array.i.ptr
  %loop.acc.next = add i32 %loop.acc, %array.i
  %i.next = add nuw i32 %i, 1
  br label %loop
}


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}