; LLVM IR from abeaumont/competitive-programming :: programming-challenges/badoo/badoo-challenge-2016 (7)

; 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"

%"struct.std::pair" = type { i32, i32 }

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSEOS0_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) #1 align 2

; 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 dso_local noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IcSaIcEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt6vectorIcSaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9positionsRSt6vectorIS_IcSaIcEESaIS1_EERS_ISt4pairIiiESaIS6_EEii(ptr noundef nonnull align 8 dereferenceable(24) %0, ptr noundef nonnull align 8 dereferenceable(24) %1, i32 noundef %2, i32 noundef %3) #2 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  %12 = alloca i32, align 4
  %13 = alloca %"struct.std::pair", align 4
  %14 = alloca %"struct.std::pair", align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 1, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %15

15:                                               ; preds = %55, %4
  %16 = load i32, ptr %10, align 4, !tbaa !9
  %17 = load i32, ptr %8, align 4, !tbaa !9
  %18 = icmp slt i32 %16, %17
  br i1 %18, label %20, label %19

19:                                               ; preds = %15
  store i32 2, ptr %11, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  br label %58

20:                                               ; preds = %15
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #3
  store i32 0, ptr %12, align 4, !tbaa !9
  br label %21

21:                                               ; preds = %51, %20
  %22 = load i32, ptr %12, align 4, !tbaa !9
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = icmp slt i32 %22, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %21
  store i32 5, ptr %11, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #3
  br label %54

26:                                               ; preds = %21
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  %28 = load i32, ptr %10, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IcSaIcEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %27, i64 noundef %29) #3
  %31 = load i32, ptr %12, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt6vectorIcSaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %30, i64 noundef %32) #3
  %34 = load i8, ptr %33, align 1, !tbaa !11
  %35 = sext i8 %34 to i32
  switch i32 %35, label %50 [
    i32 77, label %36
    i32 66, label %45
  ]

36:                                               ; preds = %26
  call void @llvm.lifetime.start.p0(i64 8, ptr %13) #3
  %37 = call i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(ptr noundef nonnull align 4 dereferenceable(4) %12, ptr noundef nonnull align 4 dereferenceable(4) %10)
  store i64 %37, ptr %13, align 4
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = load i32, ptr %9, align 4, !tbaa !9
  %40 = sext i32 %39 to i64
  %41 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %38, i64 noundef %40) #3
  %42 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSEOS0_(ptr noundef nonnull align 4 dereferenceable(8) %41, ptr noundef nonnull align 4 dereferenceable(8) %13) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %13) #3
  %43 = load i32, ptr %9, align 4, !tbaa !9
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %9, align 4, !tbaa !9
  br label %50

45:                                               ; preds = %26
  call void @llvm.lifetime.start.p0(i64 8, ptr %14) #3
  %46 = call i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(ptr noundef nonnull align 4 dereferenceable(4) %12, ptr noundef nonnull align 4 dereferenceable(4) %10)
  store i64 %46, ptr %14, align 4
  %47 = load ptr, ptr %6, align 8, !tbaa !5
  %48 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %47, i64 noundef 0) #3
  %49 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSEOS0_(ptr noundef nonnull align 4 dereferenceable(8) %48, ptr noundef nonnull align 4 dereferenceable(8) %14) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %14) #3
  br label %50

50:                                               ; preds = %45, %36, %26
  br label %51

51:                                               ; preds = %50
  %52 = load i32, ptr %12, align 4, !tbaa !9
  %53 = add nsw i32 %52, 1
  store i32 %53, ptr %12, align 4, !tbaa !9
  br label %21, !llvm.loop !12

54:                                               ; preds = %25
  br label %55

55:                                               ; preds = %54
  %56 = load i32, ptr %10, align 4, !tbaa !9
  %57 = add nsw i32 %56, 1
  store i32 %57, ptr %10, align 4, !tbaa !9
  br label %15, !llvm.loop !14

58:                                               ; preds = %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  ret void
}

; Function Attrs: mustprogress uwtable
declare dso_local i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #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 = !{!"int", !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"

%"struct.std::pair" = type { i32, i32 }

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSEOS0_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) local_unnamed_addr #1 align 2

; 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 dso_local noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IcSaIcEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt6vectorIcSaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9positionsRSt6vectorIS_IcSaIcEESaIS1_EERS_ISt4pairIiiESaIS6_EEii(ptr noundef nonnull align 8 dereferenceable(24) %0, ptr noundef nonnull align 8 dereferenceable(24) %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #2 {
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca %"struct.std::pair", align 8
  %8 = alloca %"struct.std::pair", align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %5) #3
  store i32 0, ptr %5, align 4, !tbaa !5
  %9 = icmp sgt i32 %3, 0
  %10 = icmp sgt i32 %2, 0
  %or.cond = and i1 %9, %10
  br i1 %or.cond, label %.lr.ph.us, label %._crit_edge11

.lr.ph.us:                                        ; preds = %4, %._crit_edge.us
  %.08.us = phi i32 [ %.2.us, %._crit_edge.us ], [ 1, %4 ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %6) #3
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %.lr.ph.us, %29
  %.17.us = phi i32 [ %.08.us, %.lr.ph.us ], [ %.2.us, %29 ]
  %12 = load i32, ptr %5, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IcSaIcEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %13) #3
  %15 = load i32, ptr %6, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt6vectorIcSaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %14, i64 noundef %16) #3
  %18 = load i8, ptr %17, align 1, !tbaa !9
  switch i8 %18, label %29 [
    i8 77, label %23
    i8 66, label %19
  ]

19:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %8) #3
  %20 = call i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(ptr noundef nonnull align 4 dereferenceable(4) %6, ptr noundef nonnull align 4 dereferenceable(4) %5)
  store i64 %20, ptr %8, align 8
  %21 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %1, i64 noundef 0) #3
  %22 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSEOS0_(ptr noundef nonnull align 4 dereferenceable(8) %21, ptr noundef nonnull align 4 dereferenceable(8) %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %8) #3
  br label %29

23:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %7) #3
  %24 = call i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(ptr noundef nonnull align 4 dereferenceable(4) %6, ptr noundef nonnull align 4 dereferenceable(4) %5)
  store i64 %24, ptr %7, align 8
  %25 = sext i32 %.17.us to i64
  %26 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %1, i64 noundef %25) #3
  %27 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSEOS0_(ptr noundef nonnull align 4 dereferenceable(8) %26, ptr noundef nonnull align 4 dereferenceable(8) %7) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %7) #3
  %28 = add nsw i32 %.17.us, 1
  br label %29

29:                                               ; preds = %23, %19, %11
  %.2.us = phi i32 [ %.17.us, %11 ], [ %.17.us, %19 ], [ %28, %23 ]
  %30 = load i32, ptr %6, align 4, !tbaa !5
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %6, align 4, !tbaa !5
  %32 = icmp slt i32 %31, %2
  br i1 %32, label %11, label %._crit_edge.us, !llvm.loop !10

._crit_edge.us:                                   ; preds = %29
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %6) #3
  %33 = load i32, ptr %5, align 4, !tbaa !5
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %5, align 4, !tbaa !5
  %35 = icmp slt i32 %34, %3
  br i1 %35, label %.lr.ph.us, label %._crit_edge11, !llvm.loop !12

._crit_edge11:                                    ; preds = %._crit_edge.us, %4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %5) #3
  ret void
}

; Function Attrs: mustprogress uwtable
declare dso_local i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = distinct !{!12, !11}


; Effective O3 passes: DSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass