; LLVM IR from JessonYue/LeetCodeLearning :: Array/huangxinyu/c (towSum)

; 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: nounwind uwtable
define dso_local i32 @binary_search(ptr noundef %0, i32 noundef %1, i32 noundef %2, i32 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 i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  %12 = alloca i32, align 4
  %13 = 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 i32 %3, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %14 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %14, ptr %10, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #2
  %15 = load i32, ptr %8, align 4, !tbaa !9
  %16 = sub nsw i32 %15, 1
  store i32 %16, ptr %11, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #2
  store i32 0, ptr %12, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %52, %4
  %18 = load i32, ptr %10, align 4, !tbaa !9
  %19 = load i32, ptr %11, align 4, !tbaa !9
  %20 = icmp sle i32 %18, %19
  br i1 %20, label %21, label %53

21:                                               ; preds = %17
  %22 = load i32, ptr %10, align 4, !tbaa !9
  %23 = load i32, ptr %11, align 4, !tbaa !9
  %24 = load i32, ptr %10, align 4, !tbaa !9
  %25 = sub nsw i32 %23, %24
  %26 = sdiv i32 %25, 2
  %27 = add nsw i32 %22, %26
  store i32 %27, ptr %12, align 4, !tbaa !9
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = load i32, ptr %12, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !9
  %33 = load i32, ptr %9, align 4, !tbaa !9
  %34 = icmp eq i32 %32, %33
  br i1 %34, label %35, label %37

35:                                               ; preds = %21
  %36 = load i32, ptr %12, align 4, !tbaa !9
  store i32 %36, ptr %5, align 4
  store i32 1, ptr %13, align 4
  br label %54

37:                                               ; preds = %21
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = load i32, ptr %12, align 4, !tbaa !9
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds i32, ptr %38, i64 %40
  %42 = load i32, ptr %41, align 4, !tbaa !9
  %43 = load i32, ptr %9, align 4, !tbaa !9
  %44 = icmp sgt i32 %42, %43
  br i1 %44, label %45, label %48

45:                                               ; preds = %37
  %46 = load i32, ptr %12, align 4, !tbaa !9
  %47 = sub nsw i32 %46, 1
  store i32 %47, ptr %11, align 4, !tbaa !9
  br label %51

48:                                               ; preds = %37
  %49 = load i32, ptr %12, align 4, !tbaa !9
  %50 = add nsw i32 %49, 1
  store i32 %50, ptr %10, align 4, !tbaa !9
  br label %51

51:                                               ; preds = %48, %45
  br label %52

52:                                               ; preds = %51
  br label %17, !llvm.loop !11

53:                                               ; preds = %17
  store i32 -1, ptr %5, align 4
  store i32 1, ptr %13, align 4
  br label %54

54:                                               ; preds = %53, %35
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %55 = load i32, ptr %5, align 4
  ret i32 %55
}

; 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 = { 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/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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @binary_search(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %.not21.not = icmp sgt i32 %2, %1
  br i1 %.not21.not, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %4
  %5 = add nsw i32 %2, -1
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %13
  %.023 = phi i32 [ %.1, %13 ], [ %5, %.lr.ph.preheader ]
  %.01622 = phi i32 [ %.117, %13 ], [ %1, %.lr.ph.preheader ]
  %6 = sub nsw i32 %.023, %.01622
  %7 = sdiv i32 %6, 2
  %8 = add nsw i32 %7, %.01622
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds i32, ptr %0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = icmp eq i32 %11, %3
  br i1 %12, label %._crit_edge, label %13

13:                                               ; preds = %.lr.ph
  %14 = icmp sgt i32 %11, %3
  %15 = add nsw i32 %8, -1
  %16 = add nsw i32 %8, 1
  %.117 = select i1 %14, i32 %.01622, i32 %16
  %.1 = select i1 %14, i32 %15, i32 %.023
  %.not = icmp sgt i32 %.117, %.1
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %13, %4
  %.018 = phi i32 [ -1, %4 ], [ -1, %13 ], [ %8, %.lr.ph ]
  ret i32 %.018
}

attributes #0 = { nofree norecurse nosync nounwind 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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