; LLVM IR from tangjz/acm-icpc :: hdu/6070.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"

%struct.Segment = type { double, double }

@seg = external dso_local global [120003 x %struct.Segment], align 16

; 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
  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) #3
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = call noundef i32 @_Z7seg_idxii(i32 noundef %8, i32 noundef %9)
  store i32 %10, ptr %5, align 4, !tbaa !5
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [120003 x %struct.Segment], ptr @seg, i64 0, i64 %12
  %14 = getelementptr inbounds %struct.Segment, ptr %13, i32 0, i32 1
  store double 0.000000e+00, ptr %14, align 8, !tbaa !9
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [120003 x %struct.Segment], ptr @seg, i64 0, i64 %16
  %18 = getelementptr inbounds %struct.Segment, ptr %17, i32 0, i32 0
  store double 0.000000e+00, ptr %18, align 16, !tbaa !12
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = icmp eq i32 %19, %20
  br i1 %21, label %22, label %23

22:                                               ; preds = %2
  store i32 1, ptr %6, align 4
  br label %33

23:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = load i32, ptr %4, align 4, !tbaa !5
  %26 = add nsw i32 %24, %25
  %27 = ashr i32 %26, 1
  store i32 %27, ptr %7, align 4, !tbaa !5
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = load i32, ptr %7, align 4, !tbaa !5
  call void @_Z8seg_initii(i32 noundef %28, i32 noundef %29)
  %30 = load i32, ptr %7, align 4, !tbaa !5
  %31 = add nsw i32 %30, 1
  %32 = load i32, ptr %4, align 4, !tbaa !5
  call void @_Z8seg_initii(i32 noundef %31, i32 noundef %32)
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  store i32 0, ptr %6, align 4
  br label %33

33:                                               ; preds = %23, %22
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  %34 = load i32, ptr %6, align 4
  switch i32 %34, label %36 [
    i32 0, label %35
    i32 1, label %35
  ]

35:                                               ; preds = %33, %33
  ret void

36:                                               ; preds = %33
  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

; 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !11, i64 8}
!10 = !{!"_ZTS7Segment", !11, i64 0, !11, i64 8}
!11 = !{!"double", !7, i64 0}
!12 = !{!10, !11, 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.Segment = type { double, double }

@seg = external dso_local local_unnamed_addr global [120003 x %struct.Segment], align 16

; 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 = sext i32 %3 to i64
  %5 = getelementptr inbounds [120003 x %struct.Segment], ptr @seg, i64 0, i64 %4
  %6 = icmp eq i32 %0, %1
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(16) %5, i8 0, i64 16, i1 false)
  br i1 %6, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse:                                      ; preds = %2, %tailrecurse
  %.tr14 = phi i32 [ %9, %tailrecurse ], [ %0, %2 ]
  %7 = add nsw i32 %.tr14, %1
  %8 = ashr i32 %7, 1
  tail call void @_Z8seg_initii(i32 noundef %.tr14, i32 noundef %8)
  %9 = add nsw i32 %8, 1
  %10 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %9, i32 noundef %1)
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [120003 x %struct.Segment], ptr @seg, i64 0, i64 %11
  %13 = icmp eq i32 %9, %1
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(16) %12, i8 0, i64 16, i1 false)
  br i1 %13, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %2
  ret void
}

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

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #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 = { 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 = { nocallback nofree nounwind willreturn memory(argmem: write) }

!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,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass