; LLVM IR from codemistic/Data-Structures-and-Algorithms :: CPP/searching/binary_search1.ll (Z7lastoccRSt6vectorIiSaIiEEii)

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #1 align 2

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

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z7lastoccRSt6vectorIiSaIiEEii(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = sub nsw i32 %12, 1
  store i32 %13, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 -1, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %14

14:                                               ; preds = %51, %3
  %15 = load i32, ptr %10, align 4, !tbaa !9
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = icmp slt i32 %15, %16
  br i1 %17, label %19, label %18

18:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  br label %54

19:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #2
  %20 = load i32, ptr %7, align 4, !tbaa !9
  %21 = load i32, ptr %8, align 4, !tbaa !9
  %22 = add nsw i32 %20, %21
  %23 = sdiv i32 %22, 2
  store i32 %23, ptr %11, align 4, !tbaa !9
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = load i32, ptr %11, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %24, i64 noundef %26) #2
  %28 = load i32, ptr %27, align 4, !tbaa !9
  %29 = load i32, ptr %6, align 4, !tbaa !9
  %30 = icmp eq i32 %28, %29
  br i1 %30, label %31, label %35

31:                                               ; preds = %19
  %32 = load i32, ptr %11, align 4, !tbaa !9
  store i32 %32, ptr %9, align 4, !tbaa !9
  %33 = load i32, ptr %11, align 4, !tbaa !9
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %7, align 4, !tbaa !9
  br label %50

35:                                               ; preds = %19
  %36 = load i32, ptr %6, align 4, !tbaa !9
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = load i32, ptr %11, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %37, i64 noundef %39) #2
  %41 = load i32, ptr %40, align 4, !tbaa !9
  %42 = icmp sgt i32 %36, %41
  br i1 %42, label %43, label %46

43:                                               ; preds = %35
  %44 = load i32, ptr %11, align 4, !tbaa !9
  %45 = add nsw i32 %44, 1
  store i32 %45, ptr %7, align 4, !tbaa !9
  br label %49

46:                                               ; preds = %35
  %47 = load i32, ptr %11, align 4, !tbaa !9
  %48 = sub nsw i32 %47, 1
  store i32 %48, ptr %8, align 4, !tbaa !9
  br label %49

49:                                               ; preds = %46, %43
  br label %50

50:                                               ; preds = %49, %31
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #2
  br label %51

51:                                               ; preds = %50
  %52 = load i32, ptr %10, align 4, !tbaa !9
  %53 = add nsw i32 %52, 1
  store i32 %53, ptr %10, align 4, !tbaa !9
  br label %14, !llvm.loop !11

54:                                               ; preds = %18
  %55 = load i32, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %55
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
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 = distinct !{!11, !12}
!12 = !{!"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 nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef range(i32 -1073741824, 1073741824) i32 @_Z7lastoccRSt6vectorIiSaIiEEii(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %1, 0
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %5 = add nsw i32 %1, -1
  br label %.lr.ph

._crit_edge:                                      ; preds = %22, %3
  %.017.lcssa = phi i32 [ -1, %3 ], [ %.118, %22 ]
  ret i32 %.017.lcssa

.lr.ph:                                           ; preds = %.lr.ph.preheader, %22
  %.025 = phi i32 [ %.1, %22 ], [ 0, %.lr.ph.preheader ]
  %.01624 = phi i32 [ %23, %22 ], [ 0, %.lr.ph.preheader ]
  %.01723 = phi i32 [ %.118, %22 ], [ -1, %.lr.ph.preheader ]
  %.01922 = phi i32 [ %.120, %22 ], [ %5, %.lr.ph.preheader ]
  %6 = add nsw i32 %.025, %.01922
  %7 = sdiv i32 %6, 2
  %8 = sext i32 %7 to i64
  %9 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %8) #1
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = icmp eq i32 %10, %2
  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 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %8) #1
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = icmp slt i32 %16, %2
  br i1 %17, label %18, label %20

18:                                               ; preds = %14
  %19 = add nsw i32 %7, 1
  br label %22

20:                                               ; preds = %14
  %21 = add nsw i32 %7, -1
  br label %22

22:                                               ; preds = %18, %20, %12
  %.120 = phi i32 [ %.01922, %12 ], [ %.01922, %18 ], [ %21, %20 ]
  %.118 = phi i32 [ %7, %12 ], [ %.01723, %18 ], [ %.01723, %20 ]
  %.1 = phi i32 [ %13, %12 ], [ %19, %18 ], [ %.025, %20 ]
  %23 = add nuw nsw i32 %.01624, 1
  %exitcond.not = icmp eq i32 %23, %1
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9
}

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 = { 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"}


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