; LLVM IR from tangjz/acm-icpc :: 51nod/1287.ll (Z8seg_initii)

; 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"

@seg = external dso_local global [100003 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z8seg_initii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = load i32, ptr %4, align 4, !tbaa !5
  %12 = call noundef i32 @_Z7seg_idxii(i32 noundef %10, i32 noundef %11)
  store i32 %12, ptr %5, align 4, !tbaa !5
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = icmp eq i32 %13, %14
  br i1 %15, label %16, label %21

16:                                               ; preds = %2
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds i32, ptr @seg, i64 %18
  %20 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %19)
  store i32 1, ptr %6, align 4
  br label %49

21:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = add nsw i32 %22, %23
  %25 = ashr i32 %24, 1
  store i32 %25, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = load i32, ptr %7, align 4, !tbaa !5
  %28 = call noundef i32 @_Z7seg_idxii(i32 noundef %26, i32 noundef %27)
  store i32 %28, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #4
  %29 = load i32, ptr %7, align 4, !tbaa !5
  %30 = add nsw i32 %29, 1
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = call noundef i32 @_Z7seg_idxii(i32 noundef %30, i32 noundef %31)
  store i32 %32, ptr %9, align 4, !tbaa !5
  %33 = load i32, ptr %3, align 4, !tbaa !5
  %34 = load i32, ptr %7, align 4, !tbaa !5
  call void @_Z8seg_initii(i32 noundef %33, i32 noundef %34)
  %35 = load i32, ptr %7, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  %37 = load i32, ptr %4, align 4, !tbaa !5
  call void @_Z8seg_initii(i32 noundef %36, i32 noundef %37)
  %38 = load i32, ptr %8, align 4, !tbaa !5
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds [100003 x i32], ptr @seg, i64 0, i64 %39
  %41 = load i32, ptr %9, align 4, !tbaa !5
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds [100003 x i32], ptr @seg, i64 0, i64 %42
  %44 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %40, ptr noundef nonnull align 4 dereferenceable(4) %43)
  %45 = load i32, ptr %44, align 4, !tbaa !5
  %46 = load i32, ptr %5, align 4, !tbaa !5
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds [100003 x i32], ptr @seg, i64 0, i64 %47
  store i32 %45, ptr %48, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  store i32 0, ptr %6, align 4
  br label %49

49:                                               ; preds = %21, %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  %50 = load i32, ptr %6, align 4
  switch i32 %50, label %52 [
    i32 0, label %51
    i32 1, label %51
  ]

51:                                               ; preds = %49, %49
  ret void

52:                                               ; preds = %49
  unreachable
}

; 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

declare i32 @__isoc99_scanf(ptr noundef, ...) #3

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #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 = { "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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; 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"

@seg = external dso_local global [100003 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z8seg_initii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %0, i32 noundef %1)
  %4 = icmp eq i32 %0, %1
  br i1 %4, label %common.ret, label %8

common.ret:                                       ; preds = %2
  %5 = sext i32 %3 to i64
  %6 = getelementptr inbounds i32, ptr @seg, i64 %5
  %7 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %6)
  br label %common.ret19

common.ret19:                                     ; preds = %8, %common.ret
  ret void

8:                                                ; preds = %2
  %9 = add nsw i32 %1, %0
  %10 = ashr i32 %9, 1
  %11 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %0, i32 noundef %10)
  %12 = add nsw i32 %10, 1
  %13 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %12, i32 noundef %1)
  tail call void @_Z8seg_initii(i32 noundef %0, i32 noundef %10)
  tail call void @_Z8seg_initii(i32 noundef %12, i32 noundef %1)
  %14 = sext i32 %11 to i64
  %15 = getelementptr inbounds [100003 x i32], ptr @seg, i64 0, i64 %14
  %16 = sext i32 %13 to i64
  %17 = getelementptr inbounds [100003 x i32], ptr @seg, i64 0, i64 %16
  %18 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %15, ptr noundef nonnull align 4 dereferenceable(4) %17)
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = sext i32 %3 to i64
  %21 = getelementptr inbounds [100003 x i32], ptr @seg, i64 0, i64 %20
  store i32 %19, ptr %21, align 4, !tbaa !5
  br label %common.ret19
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7seg_idxii(i32 noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #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 = { 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 #2 = { nofree nounwind "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" }

!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"}


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