; LLVM IR from LeetCode-in-C/LeetCode-in-C :: src/main/c/g0001_0100 (helper)

; 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 @helper(ptr noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca ptr, align 8
  %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
  %12 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 0, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = sub nsw i32 %13, 1
  store i32 %14, ptr %10, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #2
  store i32 -1, ptr %11, align 4, !tbaa !9
  br label %15

15:                                               ; preds = %60, %4
  %16 = load i32, ptr %9, align 4, !tbaa !9
  %17 = load i32, ptr %10, align 4, !tbaa !9
  %18 = icmp sle i32 %16, %17
  br i1 %18, label %19, label %61

19:                                               ; preds = %15
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #2
  %20 = load i32, ptr %9, align 4, !tbaa !9
  %21 = load i32, ptr %10, align 4, !tbaa !9
  %22 = load i32, ptr %9, align 4, !tbaa !9
  %23 = sub nsw i32 %21, %22
  %24 = sdiv i32 %23, 2
  %25 = add nsw i32 %20, %24
  store i32 %25, ptr %12, align 4, !tbaa !9
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  %27 = load i32, ptr %12, align 4, !tbaa !9
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds i32, ptr %26, i64 %28
  %30 = load i32, ptr %29, align 4, !tbaa !9
  %31 = load i32, ptr %7, align 4, !tbaa !9
  %32 = icmp eq i32 %30, %31
  br i1 %32, label %33, label %35

33:                                               ; preds = %19
  %34 = load i32, ptr %12, align 4, !tbaa !9
  store i32 %34, ptr %11, align 4, !tbaa !9
  br label %35

35:                                               ; preds = %33, %19
  %36 = load ptr, ptr %5, align 8, !tbaa !5
  %37 = load i32, ptr %12, align 4, !tbaa !9
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds i32, ptr %36, i64 %38
  %40 = load i32, ptr %39, align 4, !tbaa !9
  %41 = load i32, ptr %7, align 4, !tbaa !9
  %42 = icmp slt i32 %40, %41
  br i1 %42, label %54, label %43

43:                                               ; preds = %35
  %44 = load ptr, ptr %5, align 8, !tbaa !5
  %45 = load i32, ptr %12, align 4, !tbaa !9
  %46 = sext i32 %45 to i64
  %47 = getelementptr inbounds i32, ptr %44, i64 %46
  %48 = load i32, ptr %47, align 4, !tbaa !9
  %49 = load i32, ptr %7, align 4, !tbaa !9
  %50 = icmp eq i32 %48, %49
  br i1 %50, label %51, label %57

51:                                               ; preds = %43
  %52 = load i32, ptr %8, align 4, !tbaa !9
  %53 = icmp ne i32 %52, 0
  br i1 %53, label %54, label %57

54:                                               ; preds = %51, %35
  %55 = load i32, ptr %12, align 4, !tbaa !9
  %56 = add nsw i32 %55, 1
  store i32 %56, ptr %9, align 4, !tbaa !9
  br label %60

57:                                               ; preds = %51, %43
  %58 = load i32, ptr %12, align 4, !tbaa !9
  %59 = sub nsw i32 %58, 1
  store i32 %59, ptr %10, align 4, !tbaa !9
  br label %60

60:                                               ; preds = %57, %54
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #2
  br label %15, !llvm.loop !11

61:                                               ; preds = %15
  %62 = load i32, ptr %11, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  ret i32 %62
}

; 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 @helper(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %.not27 = icmp slt i32 %1, 1
  br i1 %.not27, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %4
  %5 = add nsw i32 %1, -1
  %6 = icmp ne i32 %3, 0
  br label %7

7:                                                ; preds = %.lr.ph, %7
  %.030 = phi i32 [ 0, %.lr.ph ], [ %.1, %7 ]
  %.02029 = phi i32 [ -1, %.lr.ph ], [ %spec.select, %7 ]
  %.02228 = phi i32 [ %5, %.lr.ph ], [ %.123, %7 ]
  %8 = sub nsw i32 %.02228, %.030
  %9 = sdiv i32 %8, 2
  %10 = add nsw i32 %9, %.030
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds i32, ptr %0, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = icmp eq i32 %13, %2
  %spec.select = select i1 %14, i32 %10, i32 %.02029
  %15 = icmp slt i32 %13, %2
  %or.cond = and i1 %6, %14
  %or.cond26 = or i1 %15, %or.cond
  %16 = add nsw i32 %10, 1
  %17 = add nsw i32 %10, -1
  %.123 = select i1 %or.cond26, i32 %.02228, i32 %17
  %.1 = select i1 %or.cond26, i32 %16, i32 %.030
  %.not = icmp sgt i32 %.1, %.123
  br i1 %.not, label %._crit_edge, label %7, !llvm.loop !9

._crit_edge:                                      ; preds = %7, %4
  %.020.lcssa = phi i32 [ -1, %4 ], [ %spec.select, %7 ]
  ret i32 %.020.lcssa
}

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,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass