; LLVM IR from tangjz/acm-icpc :: codeforces/1556E.ll (Z8seg_initPSt4pairIxxEiiPx)

; 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 { i64, i64 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z8seg_initPSt4pairIxxEiiPx(ptr noundef %0, i32 noundef %1, i32 noundef %2, ptr noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %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 8
  %14 = alloca %"struct.std::pair", align 8
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  store ptr %3, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #4
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = call noundef i32 @_Z7seg_idxii(i32 noundef %15, i32 noundef %16)
  store i32 %17, ptr %9, align 4, !tbaa !9
  %18 = load i32, ptr %6, align 4, !tbaa !9
  %19 = load i32, ptr %7, align 4, !tbaa !9
  %20 = icmp slt i32 %18, %19
  br i1 %20, label %21, label %69

21:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #4
  %22 = load i32, ptr %6, align 4, !tbaa !9
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = add nsw i32 %22, %23
  %25 = ashr i32 %24, 1
  store i32 %25, ptr %10, align 4, !tbaa !9
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  %27 = load i32, ptr %6, align 4, !tbaa !9
  %28 = load i32, ptr %10, align 4, !tbaa !9
  %29 = load ptr, ptr %8, align 8, !tbaa !5
  call void @_Z8seg_initPSt4pairIxxEiiPx(ptr noundef %26, i32 noundef %27, i32 noundef %28, ptr noundef %29)
  %30 = load ptr, ptr %5, align 8, !tbaa !5
  %31 = load i32, ptr %10, align 4, !tbaa !9
  %32 = add nsw i32 %31, 1
  %33 = load i32, ptr %7, align 4, !tbaa !9
  %34 = load ptr, ptr %8, align 8, !tbaa !5
  call void @_Z8seg_initPSt4pairIxxEiiPx(ptr noundef %30, i32 noundef %32, i32 noundef %33, ptr noundef %34)
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #4
  %35 = load i32, ptr %6, align 4, !tbaa !9
  %36 = load i32, ptr %10, align 4, !tbaa !9
  %37 = call noundef i32 @_Z7seg_idxii(i32 noundef %35, i32 noundef %36)
  store i32 %37, ptr %11, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #4
  %38 = load i32, ptr %10, align 4, !tbaa !9
  %39 = add nsw i32 %38, 1
  %40 = load i32, ptr %7, align 4, !tbaa !9
  %41 = call noundef i32 @_Z7seg_idxii(i32 noundef %39, i32 noundef %40)
  store i32 %41, ptr %12, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 16, ptr %13) #4
  %42 = load ptr, ptr %5, align 8, !tbaa !5
  %43 = load i32, ptr %11, align 4, !tbaa !9
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds %"struct.std::pair", ptr %42, i64 %44
  %46 = getelementptr inbounds %"struct.std::pair", ptr %45, i32 0, i32 0
  %47 = load ptr, ptr %5, align 8, !tbaa !5
  %48 = load i32, ptr %12, align 4, !tbaa !9
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds %"struct.std::pair", ptr %47, i64 %49
  %51 = getelementptr inbounds %"struct.std::pair", ptr %50, i32 0, i32 0
  %52 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %46, ptr noundef nonnull align 8 dereferenceable(8) %51)
  %53 = load ptr, ptr %5, align 8, !tbaa !5
  %54 = load i32, ptr %11, align 4, !tbaa !9
  %55 = sext i32 %54 to i64
  %56 = getelementptr inbounds %"struct.std::pair", ptr %53, i64 %55
  %57 = getelementptr inbounds %"struct.std::pair", ptr %56, i32 0, i32 1
  %58 = load ptr, ptr %5, align 8, !tbaa !5
  %59 = load i32, ptr %12, align 4, !tbaa !9
  %60 = sext i32 %59 to i64
  %61 = getelementptr inbounds %"struct.std::pair", ptr %58, i64 %60
  %62 = getelementptr inbounds %"struct.std::pair", ptr %61, i32 0, i32 1
  %63 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %57, ptr noundef nonnull align 8 dereferenceable(8) %62)
  call void @_ZNSt4pairIxxEC2IxxTnNSt9enable_ifIXaaclsr5_PCCPE18_ConstructiblePairIT_T0_EEclsr5_PCCPE26_ImplicitlyConvertiblePairIS3_S4_EEEbE4typeELb1EEERKxS8_(ptr noundef nonnull align 8 dereferenceable(16) %13, ptr noundef nonnull align 8 dereferenceable(8) %52, ptr noundef nonnull align 8 dereferenceable(8) %63)
  %64 = load ptr, ptr %5, align 8, !tbaa !5
  %65 = load i32, ptr %9, align 4, !tbaa !9
  %66 = sext i32 %65 to i64
  %67 = getelementptr inbounds %"struct.std::pair", ptr %64, i64 %66
  %68 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt4pairIxxEaSEOS0_(ptr noundef nonnull align 8 dereferenceable(16) %67, ptr noundef nonnull align 8 dereferenceable(16) %13) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %13) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #4
  br label %83

69:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 16, ptr %14) #4
  %70 = load ptr, ptr %8, align 8, !tbaa !5
  %71 = load i32, ptr %6, align 4, !tbaa !9
  %72 = sext i32 %71 to i64
  %73 = getelementptr inbounds i64, ptr %70, i64 %72
  %74 = load ptr, ptr %8, align 8, !tbaa !5
  %75 = load i32, ptr %7, align 4, !tbaa !9
  %76 = sext i32 %75 to i64
  %77 = getelementptr inbounds i64, ptr %74, i64 %76
  call void @_ZNSt4pairIxxEC2IRxS2_TnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 8 dereferenceable(16) %14, ptr noundef nonnull align 8 dereferenceable(8) %73, ptr noundef nonnull align 8 dereferenceable(8) %77)
  %78 = load ptr, ptr %5, align 8, !tbaa !5
  %79 = load i32, ptr %9, align 4, !tbaa !9
  %80 = sext i32 %79 to i64
  %81 = getelementptr inbounds %"struct.std::pair", ptr %78, i64 %80
  %82 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt4pairIxxEaSEOS0_(ptr noundef nonnull align 8 dereferenceable(16) %81, ptr noundef nonnull align 8 dereferenceable(16) %14) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %14) #4
  br label %83

83:                                               ; preds = %69, %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #4
  ret void
}

; 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 i32 @_Z7seg_idxii(i32 noundef, i32 noundef) #2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #2

; 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: mustprogress nounwind uwtable
declare dso_local void @_ZNSt4pairIxxEC2IxxTnNSt9enable_ifIXaaclsr5_PCCPE18_ConstructiblePairIT_T0_EEclsr5_PCCPE26_ImplicitlyConvertiblePairIS3_S4_EEEbE4typeELb1EEERKxS8_(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt4pairIxxEaSEOS0_(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(16)) #3 align 2

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt4pairIxxEC2IRxS2_TnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #3 align 2

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 = { 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 #4 = { 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}


; 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 { i64, i64 }

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z8seg_initPSt4pairIxxEiiPx(ptr noundef %0, i32 noundef %1, i32 noundef %2, ptr noundef %3) local_unnamed_addr #0 {
  %5 = alloca %"struct.std::pair", align 8
  %6 = alloca %"struct.std::pair", align 8
  %7 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %1, i32 noundef %2)
  %8 = icmp slt i32 %1, %2
  br i1 %8, label %9, label %common.ret

common.ret35:                                     ; preds = %9, %common.ret
  ret void

9:                                                ; preds = %4
  %10 = add nsw i32 %2, %1
  %11 = ashr i32 %10, 1
  tail call void @_Z8seg_initPSt4pairIxxEiiPx(ptr noundef %0, i32 noundef %1, i32 noundef %11, ptr noundef %3)
  %12 = add nsw i32 %11, 1
  tail call void @_Z8seg_initPSt4pairIxxEiiPx(ptr noundef %0, i32 noundef %12, i32 noundef %2, ptr noundef %3)
  %13 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %1, i32 noundef %11)
  %14 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %12, i32 noundef %2)
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %5) #3
  %15 = sext i32 %13 to i64
  %16 = getelementptr inbounds %"struct.std::pair", ptr %0, i64 %15
  %17 = sext i32 %14 to i64
  %18 = getelementptr inbounds %"struct.std::pair", ptr %0, i64 %17
  %19 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %16, ptr noundef nonnull align 8 dereferenceable(8) %18)
  %20 = getelementptr inbounds i8, ptr %16, i64 8
  %21 = getelementptr inbounds i8, ptr %18, i64 8
  %22 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %20, ptr noundef nonnull align 8 dereferenceable(8) %21)
  call void @_ZNSt4pairIxxEC2IxxTnNSt9enable_ifIXaaclsr5_PCCPE18_ConstructiblePairIT_T0_EEclsr5_PCCPE26_ImplicitlyConvertiblePairIS3_S4_EEEbE4typeELb1EEERKxS8_(ptr noundef nonnull align 8 dereferenceable(16) %5, ptr noundef nonnull align 8 dereferenceable(8) %19, ptr noundef nonnull align 8 dereferenceable(8) %22)
  %23 = sext i32 %7 to i64
  %24 = getelementptr inbounds %"struct.std::pair", ptr %0, i64 %23
  %25 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt4pairIxxEaSEOS0_(ptr noundef nonnull align 8 dereferenceable(16) %24, ptr noundef nonnull align 8 dereferenceable(16) %5) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %5) #3
  br label %common.ret35

common.ret:                                       ; preds = %4
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %6) #3
  %26 = sext i32 %1 to i64
  %27 = getelementptr inbounds i64, ptr %3, i64 %26
  %28 = sext i32 %2 to i64
  %29 = getelementptr inbounds i64, ptr %3, i64 %28
  call void @_ZNSt4pairIxxEC2IRxS2_TnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 8 dereferenceable(16) %6, ptr noundef nonnull align 8 dereferenceable(8) %27, ptr noundef nonnull align 8 dereferenceable(8) %29)
  %30 = sext i32 %7 to i64
  %31 = getelementptr inbounds %"struct.std::pair", ptr %0, i64 %30
  %32 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt4pairIxxEaSEOS0_(ptr noundef nonnull align 8 dereferenceable(16) %31, ptr noundef nonnull align 8 dereferenceable(16) %6) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %6) #3
  br label %common.ret35
}

; 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 i32 @_Z7seg_idxii(i32 noundef, i32 noundef) local_unnamed_addr #2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2

; 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 nounwind uwtable
declare dso_local void @_ZNSt4pairIxxEC2IxxTnNSt9enable_ifIXaaclsr5_PCCPE18_ConstructiblePairIT_T0_EEclsr5_PCCPE26_ImplicitlyConvertiblePairIS3_S4_EEEbE4typeELb1EEERKxS8_(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt4pairIxxEaSEOS0_(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(16)) local_unnamed_addr #0 align 2

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt4pairIxxEC2IRxS2_TnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #0 align 2

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)"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass