; LLVM IR from manishbisht/Competitive-Programming :: Coding Blocks/Competitive Warriors Challenge 3.0/Aggressive Cows.ll (Z9binSearchv)

; 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"

@arr = external dso_local global [100001 x i32], align 16
@n = external dso_local global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z1fi(i32 noundef) #0

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

; 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
define dso_local noundef i32 @_Z9binSearchv() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 0, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #2
  %4 = load i32, ptr @n, align 4, !tbaa !5
  %5 = sub nsw i32 %4, 1
  %6 = sext i32 %5 to i64
  %7 = getelementptr inbounds [100001 x i32], ptr @arr, i64 0, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %8, ptr %2, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %26, %0
  %10 = load i32, ptr %1, align 4, !tbaa !5
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = icmp slt i32 %10, %11
  br i1 %12, label %13, label %27

13:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %14 = load i32, ptr %1, align 4, !tbaa !5
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = add nsw i32 %14, %15
  %17 = sdiv i32 %16, 2
  store i32 %17, ptr %3, align 4, !tbaa !5
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = call noundef i32 @_Z1fi(i32 noundef %18)
  %20 = icmp eq i32 %19, 1
  br i1 %20, label %21, label %24

21:                                               ; preds = %13
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %1, align 4, !tbaa !5
  br label %26

24:                                               ; preds = %13
  %25 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %25, ptr %2, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %24, %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  br label %9, !llvm.loop !9

27:                                               ; preds = %9
  %28 = load i32, ptr %1, align 4, !tbaa !5
  %29 = sub nsw i32 %28, 1
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  ret i32 %29
}

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 = distinct !{!9, !10}
!10 = !{!"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"

@arr = external dso_local local_unnamed_addr global [100001 x i32], align 16
@n = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z1fi(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef range(i32 -1, 1073741824) i32 @_Z9binSearchv() local_unnamed_addr #0 {
  %1 = load i32, ptr @n, align 4, !tbaa !5
  %2 = add nsw i32 %1, -1
  %3 = sext i32 %2 to i64
  %4 = getelementptr inbounds [100001 x i32], ptr @arr, i64 0, i64 %3
  %5 = load i32, ptr %4, align 4, !tbaa !5
  %6 = icmp sgt i32 %5, 0
  br i1 %6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.011 = phi i32 [ %.1, %.lr.ph ], [ 0, %0 ]
  %.0810 = phi i32 [ %.19, %.lr.ph ], [ %5, %0 ]
  %7 = add nuw nsw i32 %.011, %.0810
  %8 = lshr i32 %7, 1
  %9 = tail call noundef i32 @_Z1fi(i32 noundef %8)
  %10 = icmp eq i32 %9, 1
  %11 = add nuw nsw i32 %8, 1
  %.19 = select i1 %10, i32 %.0810, i32 %8
  %.1 = select i1 %10, i32 %11, i32 %.011
  %12 = icmp slt i32 %.1, %.19
  br i1 %12, label %.lr.ph, label %._crit_edge.loopexit, !llvm.loop !9

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %13 = add nsw i32 %.1, -1
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %0
  %.0.lcssa = phi i32 [ -1, %0 ], [ %13, %._crit_edge.loopexit ]
  ret i32 %.0.lcssa
}

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" }

!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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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