; LLVM IR from Izaron/ACM-ICPC :: Russian Olympiad in Informatics/Final Stage 2015/grants.ll (Z5brutex)

; 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"

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z5brutex(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  store i64 0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  store i64 0, ptr %4, align 8, !tbaa !5
  br label %9

9:                                                ; preds = %49, %1
  %10 = load i64, ptr %4, align 8, !tbaa !5
  %11 = load i64, ptr %2, align 8, !tbaa !5
  %12 = icmp sle i64 %10, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %9
  store i32 2, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %52

14:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %15 = load i64, ptr %4, align 8, !tbaa !5
  store i64 %15, ptr %6, align 8, !tbaa !5
  br label %16

16:                                               ; preds = %44, %14
  %17 = load i64, ptr %6, align 8, !tbaa !5
  %18 = load i64, ptr %2, align 8, !tbaa !5
  %19 = load i64, ptr %4, align 8, !tbaa !5
  %20 = sub nsw i64 %18, %19
  %21 = icmp sle i64 %17, %20
  br i1 %21, label %23, label %22

22:                                               ; preds = %16
  store i32 5, ptr %5, align 4
  br label %47

23:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %24 = load i64, ptr %2, align 8, !tbaa !5
  %25 = load i64, ptr %4, align 8, !tbaa !5
  %26 = sub nsw i64 %24, %25
  %27 = load i64, ptr %6, align 8, !tbaa !5
  %28 = sub nsw i64 %26, %27
  store i64 %28, ptr %7, align 8, !tbaa !5
  %29 = load i64, ptr %7, align 8, !tbaa !5
  %30 = load i64, ptr %6, align 8, !tbaa !5
  %31 = icmp slt i64 %29, %30
  br i1 %31, label %32, label %33

32:                                               ; preds = %23
  store i32 5, ptr %5, align 4
  br label %41

33:                                               ; preds = %23
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %34 = load i64, ptr %4, align 8, !tbaa !5
  %35 = load i64, ptr %6, align 8, !tbaa !5
  %36 = and i64 %34, %35
  %37 = load i64, ptr %7, align 8, !tbaa !5
  %38 = and i64 %36, %37
  store i64 %38, ptr %8, align 8, !tbaa !5
  %39 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %8)
  %40 = load i64, ptr %39, align 8, !tbaa !5
  store i64 %40, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  store i32 0, ptr %5, align 4
  br label %41

41:                                               ; preds = %33, %32
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  %42 = load i32, ptr %5, align 4
  switch i32 %42, label %47 [
    i32 0, label %43
  ]

43:                                               ; preds = %41
  br label %44

44:                                               ; preds = %43
  %45 = load i64, ptr %6, align 8, !tbaa !5
  %46 = add nsw i64 %45, 1
  store i64 %46, ptr %6, align 8, !tbaa !5
  br label %16, !llvm.loop !9

47:                                               ; preds = %41, %22
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %48

48:                                               ; preds = %47
  br label %49

49:                                               ; preds = %48
  %50 = load i64, ptr %4, align 8, !tbaa !5
  %51 = add nsw i64 %50, 1
  store i64 %51, ptr %4, align 8, !tbaa !5
  br label %9, !llvm.loop !11

52:                                               ; preds = %13
  %53 = load i64, ptr %3, align 8, !tbaa !5
  store i32 1, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret i64 %53
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { inlinehint 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 #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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; 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"

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z5brutex(i64 noundef %0) local_unnamed_addr #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  store i64 0, ptr %2, align 8, !tbaa !5
  %.not27 = icmp slt i64 %0, 0
  br i1 %.not27, label %._crit_edge, label %.preheader

.preheader:                                       ; preds = %1, %.critedge
  %4 = phi i64 [ %15, %.critedge ], [ 0, %1 ]
  %.028 = phi i64 [ %16, %.critedge ], [ 0, %1 ]
  %5 = sub nsw i64 %0, %.028
  %.not2224 = icmp sgt i64 %.028, %5
  %6 = sub nsw i64 %5, %.028
  %.not2329 = icmp slt i64 %6, %.028
  %or.cond = select i1 %.not2224, i1 true, i1 %.not2329
  br i1 %or.cond, label %.critedge, label %.lr.ph31

._crit_edge:                                      ; preds = %.critedge, %1
  %7 = phi i64 [ 0, %1 ], [ %15, %.critedge ]
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  ret i64 %7

.lr.ph:                                           ; preds = %.lr.ph31
  %8 = add nuw nsw i64 %.0172530, 1
  %9 = sub nsw i64 %5, %8
  %.not23.not = icmp sgt i64 %9, %.0172530
  br i1 %.not23.not, label %.lr.ph31, label %.critedge, !llvm.loop !9

.lr.ph31:                                         ; preds = %.preheader, %.lr.ph
  %10 = phi i64 [ %9, %.lr.ph ], [ %6, %.preheader ]
  %.0172530 = phi i64 [ %8, %.lr.ph ], [ %.028, %.preheader ]
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  %11 = and i64 %.028, %10
  %12 = and i64 %11, %.0172530
  store i64 %12, ptr %3, align 8, !tbaa !5
  %13 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %2, ptr noundef nonnull align 8 dereferenceable(8) %3)
  %14 = load i64, ptr %13, align 8, !tbaa !5
  store i64 %14, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  %.not22.not = icmp slt i64 %.0172530, %5
  br i1 %.not22.not, label %.lr.ph, label %.critedge, !llvm.loop !9

.critedge:                                        ; preds = %.lr.ph, %.lr.ph31, %.preheader
  %15 = phi i64 [ %4, %.preheader ], [ %14, %.lr.ph31 ], [ %14, %.lr.ph ]
  %16 = add nuw i64 %.028, 1
  %exitcond.not = icmp eq i64 %.028, %0
  br i1 %exitcond.not, label %._crit_edge, label %.preheader, !llvm.loop !11
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { inlinehint 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 #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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass