; LLVM IR from seikhchilli/codeforces-solution :: 252C.ll (Z13binary_searchPxiix)

; 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"

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z13binary_searchPxiix(ptr noundef %0, i32 noundef %1, i32 noundef %2, i64 noundef %3) #0 {
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i64, align 8
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %6, align 8, !tbaa !5
  store i32 %1, ptr %7, align 4, !tbaa !9
  store i32 %2, ptr %8, align 4, !tbaa !9
  store i64 %3, ptr %9, align 8, !tbaa !11
  br label %12

12:                                               ; preds = %54, %4
  %13 = load i32, ptr %7, align 4, !tbaa !9
  %14 = load i32, ptr %8, align 4, !tbaa !9
  %15 = icmp slt i32 %13, %14
  br i1 %15, label %16, label %55

16:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = add nsw i32 %17, %18
  %20 = sdiv i32 %19, 2
  store i32 %20, ptr %10, align 4, !tbaa !9
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = load i32, ptr %10, align 4, !tbaa !9
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds i64, ptr %21, i64 %23
  %25 = load i64, ptr %24, align 8, !tbaa !11
  %26 = load i64, ptr %9, align 8, !tbaa !11
  %27 = icmp sgt i64 %25, %26
  br i1 %27, label %28, label %31

28:                                               ; preds = %16
  %29 = load i32, ptr %10, align 4, !tbaa !9
  %30 = sub nsw i32 %29, 1
  store i32 %30, ptr %8, align 4, !tbaa !9
  br label %51

31:                                               ; preds = %16
  %32 = load i32, ptr %10, align 4, !tbaa !9
  %33 = load i32, ptr %8, align 4, !tbaa !9
  %34 = icmp eq i32 %32, %33
  br i1 %34, label %35, label %37

35:                                               ; preds = %31
  %36 = load i32, ptr %10, align 4, !tbaa !9
  store i32 %36, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %52

37:                                               ; preds = %31
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = load i32, ptr %10, align 4, !tbaa !9
  %40 = add nsw i32 %39, 1
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds i64, ptr %38, i64 %41
  %43 = load i64, ptr %42, align 8, !tbaa !11
  %44 = load i64, ptr %9, align 8, !tbaa !11
  %45 = icmp sgt i64 %43, %44
  br i1 %45, label %46, label %48

46:                                               ; preds = %37
  %47 = load i32, ptr %10, align 4, !tbaa !9
  store i32 %47, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %52

48:                                               ; preds = %37
  %49 = load i32, ptr %10, align 4, !tbaa !9
  %50 = add nsw i32 %49, 1
  store i32 %50, ptr %7, align 4, !tbaa !9
  br label %51

51:                                               ; preds = %48, %28
  store i32 0, ptr %11, align 4
  br label %52

52:                                               ; preds = %51, %46, %35
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %53 = load i32, ptr %11, align 4
  switch i32 %53, label %59 [
    i32 0, label %54
    i32 1, label %57
  ]

54:                                               ; preds = %52
  br label %12, !llvm.loop !13

55:                                               ; preds = %12
  %56 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %56, ptr %5, align 4
  br label %57

57:                                               ; preds = %55, %52
  %58 = load i32, ptr %5, align 4
  ret i32 %58

59:                                               ; preds = %52
  unreachable
}

; 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

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 = !{!"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}
!11 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, i64 0}
!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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef i32 @_Z13binary_searchPxiix(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2, i64 noundef %3) local_unnamed_addr #0 {
  %5 = icmp slt i32 %1, %2
  br i1 %5, label %.lr.ph, label %.thread

.lr.ph:                                           ; preds = %4, %22
  %.01934 = phi i32 [ %.221, %22 ], [ %1, %4 ]
  %.02233 = phi i32 [ %.224, %22 ], [ %2, %4 ]
  %6 = add nsw i32 %.01934, %.02233
  %7 = sdiv i32 %6, 2
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds i64, ptr %0, i64 %8
  %10 = load i64, ptr %9, align 8, !tbaa !5
  %11 = icmp sgt i64 %10, %3
  br i1 %11, label %12, label %14

12:                                               ; preds = %.lr.ph
  %13 = add nsw i32 %7, -1
  br label %22

14:                                               ; preds = %.lr.ph
  %15 = icmp eq i32 %7, %.02233
  br i1 %15, label %.thread, label %16

16:                                               ; preds = %14
  %17 = add nsw i32 %7, 1
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds i64, ptr %0, i64 %18
  %20 = load i64, ptr %19, align 8, !tbaa !5
  %21 = icmp sgt i64 %20, %3
  br i1 %21, label %.thread, label %22

22:                                               ; preds = %16, %12
  %.224 = phi i32 [ %13, %12 ], [ %.02233, %16 ]
  %.221 = phi i32 [ %.01934, %12 ], [ %17, %16 ]
  %23 = icmp slt i32 %.221, %.224
  br i1 %23, label %.lr.ph, label %.thread

.thread:                                          ; preds = %22, %14, %16, %4
  %.2 = phi i32 [ %1, %4 ], [ %7, %16 ], [ %.02233, %14 ], [ %.221, %22 ]
  ret i32 %.2
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass