; LLVM IR from MikeMirzayanov/testlib :: checkers/acmp.ll (ZN8InStream7skipBomEv)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%"class.std::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }
%"class.std::allocator" = type { i8 }

@.str.173 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

declare i32 @__gxx_personality_v0(...)

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
declare void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare void @_ZNSaIcEC2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2IS3_EEPKcRKS3_(ptr noundef nonnull align 8 dereferenceable(32), ptr noundef, ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN8InStream7skipBomEv(ptr noundef nonnull align 8 dereferenceable(128) %0) #2 align 2 personality ptr @__gxx_personality_v0 {
  %2 = alloca ptr, align 8
  %3 = alloca %"class.std::__cxx11::basic_string", align 8
  %4 = alloca %"class.std::allocator", align 1
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i64, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %8 = load ptr, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 32, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 1, ptr %4) #3
  call void @_ZNSaIcEC2Ev(ptr noundef nonnull align 1 dereferenceable(1) %4) #3
  invoke void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2IS3_EEPKcRKS3_(ptr noundef nonnull align 8 dereferenceable(32) %3, ptr noundef @.str.173, ptr noundef nonnull align 1 dereferenceable(1) %4)
          to label %9 unwind label %29

9:                                                ; preds = %1
  call void @_ZNSt15__new_allocatorIcED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %4) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr %4) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  store i64 0, ptr %7, align 8, !tbaa !9
  br label %10

10:                                               ; preds = %28, %9
  %11 = load i64, ptr %7, align 8, !tbaa !9
  %12 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %3) #3
  %13 = icmp ult i64 %11, %12
  br i1 %13, label %14, label %23

14:                                               ; preds = %10
  %15 = invoke noundef signext i8 @_ZN8InStream7curCharEv(ptr noundef nonnull align 8 dereferenceable(128) %8)
          to label %16 unwind label %33

16:                                               ; preds = %14
  %17 = sext i8 %15 to i32
  %18 = load i64, ptr %7, align 8, !tbaa !9
  %19 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %3, i64 noundef %18) #3
  %20 = load i8, ptr %19, align 1, !tbaa !11
  %21 = sext i8 %20 to i32
  %22 = icmp eq i32 %17, %21
  br label %23

23:                                               ; preds = %16, %10
  %24 = phi i1 [ false, %10 ], [ %22, %16 ]
  br i1 %24, label %25, label %37

25:                                               ; preds = %23
  %26 = load i64, ptr %7, align 8, !tbaa !9
  %27 = add i64 %26, 1
  store i64 %27, ptr %7, align 8, !tbaa !9
  invoke void @_ZN8InStream8skipCharEv(ptr noundef nonnull align 8 dereferenceable(128) %8)
          to label %28 unwind label %33

28:                                               ; preds = %25
  br label %10, !llvm.loop !12

29:                                               ; preds = %1
  %30 = landingpad { ptr, i32 }
          cleanup
  %31 = extractvalue { ptr, i32 } %30, 0
  store ptr %31, ptr %5, align 8
  %32 = extractvalue { ptr, i32 } %30, 1
  store i32 %32, ptr %6, align 4
  call void @_ZNSt15__new_allocatorIcED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %4) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr %4) #3
  br label %55

33:                                               ; preds = %45, %25, %14
  %34 = landingpad { ptr, i32 }
          cleanup
  %35 = extractvalue { ptr, i32 } %34, 0
  store ptr %35, ptr %5, align 8
  %36 = extractvalue { ptr, i32 } %34, 1
  store i32 %36, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %3) #3
  br label %55

37:                                               ; preds = %23
  %38 = load i64, ptr %7, align 8, !tbaa !9
  %39 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %3) #3
  %40 = icmp ult i64 %38, %39
  br i1 %40, label %41, label %54

41:                                               ; preds = %37
  br label %42

42:                                               ; preds = %50, %41
  %43 = load i64, ptr %7, align 8, !tbaa !9
  %44 = icmp ne i64 %43, 0
  br i1 %44, label %45, label %53

45:                                               ; preds = %42
  %46 = load i64, ptr %7, align 8, !tbaa !9
  %47 = sub i64 %46, 1
  %48 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %3, i64 noundef %47) #3
  %49 = load i8, ptr %48, align 1, !tbaa !11
  invoke void @_ZN8InStream10unreadCharEc(ptr noundef nonnull align 8 dereferenceable(128) %8, i8 noundef signext %49)
          to label %50 unwind label %33

50:                                               ; preds = %45
  %51 = load i64, ptr %7, align 8, !tbaa !9
  %52 = add i64 %51, -1
  store i64 %52, ptr %7, align 8, !tbaa !9
  br label %42, !llvm.loop !14

53:                                               ; preds = %42
  br label %54

54:                                               ; preds = %53, %37
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %3) #3
  call void @llvm.lifetime.end.p0(i64 32, ptr %3) #3
  ret void

55:                                               ; preds = %33, %29
  call void @llvm.lifetime.end.p0(i64 32, ptr %3) #3
  br label %56

56:                                               ; preds = %55
  %57 = load ptr, ptr %5, align 8
  %58 = load i32, ptr %6, align 4
  %59 = insertvalue { ptr, i32 } poison, ptr %57, 0
  %60 = insertvalue { ptr, i32 } %59, i32 %58, 1
  resume { ptr, i32 } %60
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32)) #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef signext i8 @_ZN8InStream7curCharEv(ptr noundef nonnull align 8 dereferenceable(128)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN8InStream8skipCharEv(ptr noundef nonnull align 8 dereferenceable(128)) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN8InStream10unreadCharEc(ptr noundef nonnull align 8 dereferenceable(128), i8 noundef signext) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt15__new_allocatorIcED2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #1 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%"class.std::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }
%"class.std::allocator" = type { i8 }

@.str.173 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
declare void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare void @_ZNSaIcEC2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2IS3_EEPKcRKS3_(ptr noundef nonnull align 8 dereferenceable(32), ptr noundef, ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN8InStream7skipBomEv(ptr noundef nonnull align 8 dereferenceable(128) %0) local_unnamed_addr #2 align 2 personality ptr @__gxx_personality_v0 {
  %2 = alloca %"class.std::__cxx11::basic_string", align 8
  %3 = alloca %"class.std::allocator", align 1
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %2) #3
  call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %3) #3
  call void @_ZNSaIcEC2Ev(ptr noundef nonnull align 1 dereferenceable(1) %3) #3
  invoke void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2IS3_EEPKcRKS3_(ptr noundef nonnull align 8 dereferenceable(32) %2, ptr noundef nonnull @.str.173, ptr noundef nonnull align 1 dereferenceable(1) %3)
          to label %4 unwind label %16

4:                                                ; preds = %1
  call void @_ZNSt15__new_allocatorIcED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %3) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %3) #3
  br label %5

5:                                                ; preds = %14, %4
  %.0 = phi i64 [ 0, %4 ], [ %15, %14 ]
  %6 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %2) #3
  %7 = icmp ult i64 %.0, %6
  br i1 %7, label %8, label %.critedge

8:                                                ; preds = %5
  %9 = invoke noundef signext i8 @_ZN8InStream7curCharEv(ptr noundef nonnull align 8 dereferenceable(128) %0)
          to label %10 unwind label %.loopexit.split-lp

10:                                               ; preds = %8
  %11 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %2, i64 noundef %.0) #3
  %12 = load i8, ptr %11, align 1, !tbaa !5
  %13 = icmp eq i8 %9, %12
  br i1 %13, label %14, label %.critedge

14:                                               ; preds = %10
  %15 = add nuw i64 %.0, 1
  invoke void @_ZN8InStream8skipCharEv(ptr noundef nonnull align 8 dereferenceable(128) %0)
          to label %5 unwind label %.loopexit.split-lp, !llvm.loop !8

16:                                               ; preds = %1
  %17 = landingpad { ptr, i32 }
          cleanup
  call void @_ZNSt15__new_allocatorIcED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %3) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %3) #3
  br label %26

.loopexit:                                        ; preds = %.preheader
  %lpad.loopexit = landingpad { ptr, i32 }
          cleanup
  br label %18

.loopexit.split-lp:                               ; preds = %8, %14
  %lpad.loopexit.split-lp = landingpad { ptr, i32 }
          cleanup
  br label %18

18:                                               ; preds = %.loopexit.split-lp, %.loopexit
  %lpad.phi = phi { ptr, i32 } [ %lpad.loopexit, %.loopexit ], [ %lpad.loopexit.split-lp, %.loopexit.split-lp ]
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %2) #3
  br label %26

.critedge:                                        ; preds = %5, %10
  %19 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %2) #3
  %20 = icmp ult i64 %.0, %19
  %21 = icmp ne i64 %.0, 0
  %or.cond = and i1 %21, %20
  br i1 %or.cond, label %.preheader, label %.loopexit15

.preheader:                                       ; preds = %.critedge, %25
  %.1 = phi i64 [ %22, %25 ], [ %.0, %.critedge ]
  %22 = add i64 %.1, -1
  %23 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %2, i64 noundef %22) #3
  %24 = load i8, ptr %23, align 1, !tbaa !5
  invoke void @_ZN8InStream10unreadCharEc(ptr noundef nonnull align 8 dereferenceable(128) %0, i8 noundef signext %24)
          to label %25 unwind label %.loopexit

25:                                               ; preds = %.preheader
  %.old1.not = icmp eq i64 %22, 0
  br i1 %.old1.not, label %.loopexit15, label %.preheader

.loopexit15:                                      ; preds = %25, %.critedge
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %2) #3
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %2) #3
  ret void

26:                                               ; preds = %18, %16
  %.pn = phi { ptr, i32 } [ %lpad.phi, %18 ], [ %17, %16 ]
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %2) #3
  resume { ptr, i32 } %.pn
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef signext i8 @_ZN8InStream7curCharEv(ptr noundef nonnull align 8 dereferenceable(128)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN8InStream8skipCharEv(ptr noundef nonnull align 8 dereferenceable(128)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN8InStream10unreadCharEc(ptr noundef nonnull align 8 dereferenceable(128), i8 noundef signext) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt15__new_allocatorIcED2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #1 align 2

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass