; LLVM IR from codemistic/Data-Structures-and-Algorithms :: CPP/LINKED LIST/SINGLY LINKED LIST/leetcode92.ll (Z14reverseBetweenP4nodeii)

; 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"

%class.node = type { i32, ptr }

; 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
define dso_local noundef ptr @_Z14reverseBetweenP4nodeii(ptr noundef %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 ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca ptr, align 8
  %11 = alloca ptr, align 8
  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 8, ptr %7) #2
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %12, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store ptr null, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 1, ptr %9, align 4, !tbaa !9
  br label %13

13:                                               ; preds = %17, %3
  %14 = load i32, ptr %9, align 4, !tbaa !9
  %15 = load i32, ptr %5, align 4, !tbaa !9
  %16 = icmp ne i32 %14, %15
  br i1 %16, label %17, label %24

17:                                               ; preds = %13
  %18 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %18, ptr %8, align 8, !tbaa !5
  %19 = load ptr, ptr %7, align 8, !tbaa !5
  %20 = getelementptr inbounds %class.node, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !11
  store ptr %21, ptr %7, align 8, !tbaa !5
  %22 = load i32, ptr %9, align 4, !tbaa !9
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %9, align 4, !tbaa !9
  br label %13, !llvm.loop !13

24:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #2
  %25 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %25, ptr %10, align 8, !tbaa !5
  br label %26

26:                                               ; preds = %30, %24
  %27 = load i32, ptr %9, align 4, !tbaa !9
  %28 = load i32, ptr %6, align 4, !tbaa !9
  %29 = icmp ne i32 %27, %28
  br i1 %29, label %30, label %36

30:                                               ; preds = %26
  %31 = load ptr, ptr %7, align 8, !tbaa !5
  %32 = getelementptr inbounds %class.node, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !11
  store ptr %33, ptr %7, align 8, !tbaa !5
  %34 = load i32, ptr %9, align 4, !tbaa !9
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %9, align 4, !tbaa !9
  br label %26, !llvm.loop !15

36:                                               ; preds = %26
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #2
  %37 = load ptr, ptr %7, align 8, !tbaa !5
  %38 = getelementptr inbounds %class.node, ptr %37, i32 0, i32 1
  %39 = load ptr, ptr %38, align 8, !tbaa !11
  store ptr %39, ptr %11, align 8, !tbaa !5
  unreachable
}

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 = !{!12, !6, i64 8}
!12 = !{!"_ZTS4node", !10, i64 0, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}


; 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 noreturn nosync nounwind memory(inaccessiblemem: write) uwtable
define dso_local noalias noundef nonnull ptr @_Z14reverseBetweenP4nodeii(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  unreachable
}

attributes #0 = { mustprogress nofree norecurse noreturn nosync nounwind memory(inaccessiblemem: write) 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)"}


; Effective O3 passes: BDCEPass,GlobalDCEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass