; LLVM IR from pranjalwalia/Competitive-programming :: AtCoder/ABC/160/C.ll (Z2bsPxxxx)

; 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 uwtable
define dso_local noundef i64 @_Z2bsPxxxx(ptr noundef %0, i64 noundef %1, i64 noundef %2, i64 noundef %3) #0 {
  %5 = alloca i64, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  %9 = alloca i64, align 8
  %10 = alloca i64, align 8
  %11 = alloca i32, align 4
  store ptr %0, ptr %6, align 8, !tbaa !5
  store i64 %1, ptr %7, align 8, !tbaa !9
  store i64 %2, ptr %8, align 8, !tbaa !9
  store i64 %3, ptr %9, align 8, !tbaa !9
  %12 = load i64, ptr %7, align 8, !tbaa !9
  %13 = load i64, ptr %8, align 8, !tbaa !9
  %14 = icmp sle i64 %12, %13
  br i1 %14, label %15, label %50

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

26:                                               ; preds = %15
  %27 = load i64, ptr %10, align 8, !tbaa !9
  store i64 %27, ptr %5, align 8
  store i32 1, ptr %11, align 4
  br label %49

28:                                               ; preds = %15
  %29 = load ptr, ptr %6, align 8, !tbaa !5
  %30 = load i64, ptr %10, align 8, !tbaa !9
  %31 = getelementptr inbounds i64, ptr %29, i64 %30
  %32 = load i64, ptr %31, align 8, !tbaa !9
  %33 = load i64, ptr %9, align 8, !tbaa !9
  %34 = icmp sgt i64 %32, %33
  br i1 %34, label %35, label %42

35:                                               ; preds = %28
  %36 = load ptr, ptr %6, align 8, !tbaa !5
  %37 = load i64, ptr %7, align 8, !tbaa !9
  %38 = load i64, ptr %10, align 8, !tbaa !9
  %39 = sub nsw i64 %38, 1
  %40 = load i64, ptr %9, align 8, !tbaa !9
  %41 = call noundef i64 @_Z2bsPxxxx(ptr noundef %36, i64 noundef %37, i64 noundef %39, i64 noundef %40)
  store i64 %41, ptr %5, align 8
  store i32 1, ptr %11, align 4
  br label %49

42:                                               ; preds = %28
  %43 = load ptr, ptr %6, align 8, !tbaa !5
  %44 = load i64, ptr %10, align 8, !tbaa !9
  %45 = add nsw i64 %44, 1
  %46 = load i64, ptr %8, align 8, !tbaa !9
  %47 = load i64, ptr %9, align 8, !tbaa !9
  %48 = call noundef i64 @_Z2bsPxxxx(ptr noundef %43, i64 noundef %45, i64 noundef %46, i64 noundef %47)
  store i64 %48, ptr %5, align 8
  store i32 1, ptr %11, align 4
  br label %49

49:                                               ; preds = %42, %35, %26
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #2
  br label %51

50:                                               ; preds = %4
  store i64 -1, ptr %5, align 8
  br label %51

51:                                               ; preds = %50, %49
  %52 = load i64, ptr %5, align 8
  ret i64 %52
}

; 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 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 = !{!"long long", !7, 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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef range(i64 -4611686018427387904, 4611686018427387904) i64 @_Z2bsPxxxx(ptr nocapture noundef readonly %0, i64 noundef %1, i64 noundef %2, i64 noundef %3) local_unnamed_addr #0 {
  %.not2731 = icmp sgt i64 %1, %2
  br i1 %.not2731, label %tailrecurse.outer._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %4, %tailrecurse.outer
  %.tr24.ph33 = phi i64 [ %.tr2428, %tailrecurse.outer ], [ %2, %4 ]
  %.tr23.ph32 = phi i64 [ %14, %tailrecurse.outer ], [ %1, %4 ]
  br label %5

5:                                                ; preds = %.lr.ph, %tailrecurse
  %.tr2428 = phi i64 [ %.tr24.ph33, %.lr.ph ], [ %13, %tailrecurse ]
  %6 = add nsw i64 %.tr2428, %.tr23.ph32
  %7 = sdiv i64 %6, 2
  %8 = getelementptr inbounds i64, ptr %0, i64 %7
  %9 = load i64, ptr %8, align 8, !tbaa !5
  %10 = icmp eq i64 %9, %3
  br i1 %10, label %tailrecurse.outer._crit_edge, label %11

11:                                               ; preds = %5
  %12 = icmp sgt i64 %9, %3
  br i1 %12, label %tailrecurse, label %tailrecurse.outer

tailrecurse:                                      ; preds = %11
  %13 = add nsw i64 %7, -1
  %.not.not = icmp slt i64 %.tr23.ph32, %7
  br i1 %.not.not, label %5, label %tailrecurse.outer._crit_edge

tailrecurse.outer:                                ; preds = %11
  %14 = add nsw i64 %7, 1
  %.not27.not = icmp slt i64 %7, %.tr2428
  br i1 %.not27.not, label %.lr.ph, label %tailrecurse.outer._crit_edge

tailrecurse.outer._crit_edge:                     ; preds = %tailrecurse.outer, %5, %tailrecurse, %4
  %.1 = phi i64 [ -1, %4 ], [ -1, %tailrecurse ], [ %7, %5 ], [ -1, %tailrecurse.outer ]
  ret i64 %.1
}

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,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass