; LLVM IR from tangjz/acm-icpc :: codeforces/complete/1030F.ll (Z8seg_findiix)

; 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 { i64, i32 }

@seg = external dso_local global [400003 x %struct.Segment], align 16

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

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

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

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8seg_findiix(i32 noundef %0, i32 noundef %1, i64 noundef %2) #2 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  br label %8

8:                                                ; preds = %40, %3
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = icmp slt i32 %9, %10
  br i1 %11, label %12, label %41

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = load i32, ptr %5, align 4, !tbaa !5
  %15 = add nsw i32 %13, %14
  %16 = ashr i32 %15, 1
  store i32 %16, ptr %7, align 4, !tbaa !5
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = load i32, ptr %7, align 4, !tbaa !5
  %19 = call noundef i32 @_Z7seg_idxii(i32 noundef %17, i32 noundef %18)
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [400003 x %struct.Segment], ptr @seg, i64 0, i64 %20
  %22 = getelementptr inbounds %struct.Segment, ptr %21, i32 0, i32 0
  %23 = load i64, ptr %22, align 16, !tbaa !11
  %24 = load i64, ptr %6, align 8, !tbaa !9
  %25 = icmp sge i64 %23, %24
  br i1 %25, label %26, label %28

26:                                               ; preds = %12
  %27 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %27, ptr %5, align 4, !tbaa !5
  br label %40

28:                                               ; preds = %12
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = load i32, ptr %7, align 4, !tbaa !5
  %31 = call noundef i32 @_Z7seg_idxii(i32 noundef %29, i32 noundef %30)
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [400003 x %struct.Segment], ptr @seg, i64 0, i64 %32
  %34 = getelementptr inbounds %struct.Segment, ptr %33, i32 0, i32 0
  %35 = load i64, ptr %34, align 16, !tbaa !11
  %36 = load i64, ptr %6, align 8, !tbaa !9
  %37 = sub nsw i64 %36, %35
  store i64 %37, ptr %6, align 8, !tbaa !9
  %38 = load i32, ptr %7, align 4, !tbaa !5
  %39 = add nsw i32 %38, 1
  store i32 %39, ptr %4, align 4, !tbaa !5
  br label %40

40:                                               ; preds = %28, %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  br label %8, !llvm.loop !13

41:                                               ; preds = %8
  %42 = load i32, ptr %4, align 4, !tbaa !5
  ret i32 %42
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"_ZTS7Segment", !10, i64 0, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; 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 { i64, i32 }

@seg = external dso_local local_unnamed_addr global [400003 x %struct.Segment], align 16

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7seg_idxii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z8seg_findiix(i32 noundef %0, i32 noundef %1, i64 noundef %2) local_unnamed_addr #1 {
  %4 = icmp slt i32 %0, %1
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3, %18
  %.019 = phi i32 [ %.1, %18 ], [ %0, %3 ]
  %.01318 = phi i64 [ %.114, %18 ], [ %2, %3 ]
  %.01517 = phi i32 [ %.116, %18 ], [ %1, %3 ]
  %5 = add nsw i32 %.019, %.01517
  %6 = ashr i32 %5, 1
  %7 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %.019, i32 noundef %6)
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [400003 x %struct.Segment], ptr @seg, i64 0, i64 %8
  %10 = load i64, ptr %9, align 16, !tbaa !5
  %.not = icmp slt i64 %10, %.01318
  br i1 %.not, label %11, label %18

11:                                               ; preds = %.lr.ph
  %12 = tail call noundef i32 @_Z7seg_idxii(i32 noundef %.019, i32 noundef %6)
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [400003 x %struct.Segment], ptr @seg, i64 0, i64 %13
  %15 = load i64, ptr %14, align 16, !tbaa !5
  %16 = sub nsw i64 %.01318, %15
  %17 = add nsw i32 %6, 1
  br label %18

18:                                               ; preds = %.lr.ph, %11
  %.116 = phi i32 [ %.01517, %11 ], [ %6, %.lr.ph ]
  %.114 = phi i64 [ %16, %11 ], [ %.01318, %.lr.ph ]
  %.1 = phi i32 [ %17, %11 ], [ %.019, %.lr.ph ]
  %19 = icmp slt i32 %.1, %.116
  br i1 %19, label %.lr.ph, label %._crit_edge, !llvm.loop !11

._crit_edge:                                      ; preds = %18, %3
  %.0.lcssa = phi i32 [ %0, %3 ], [ %.1, %18 ]
  ret i32 %.0.lcssa
}

attributes #0 = { 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 #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" }

!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, !7, i64 0}
!6 = !{!"_ZTS7Segment", !7, i64 0, !10, i64 8}
!7 = !{!"long long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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