; LLVM IR from Leet-Us-Code/DSA-A-Z-Practice :: Sid's Levels/Level - 1/LinkedList/mergeTwoLinkedListsIterative.ll (Z11sortedMergeP4NodeS0_)

; 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"

%struct.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: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) #1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) unnamed_addr #2 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) #3

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

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_Z11sortedMergeP4NodeS0_(ptr noundef %0, ptr noundef %1) #4 personality ptr @__gxx_personality_v0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  %11 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 16) #6
  invoke void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %11, i32 noundef 0)
          to label %12 unwind label %39

12:                                               ; preds = %2
  store ptr %11, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #5
  %13 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %13, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #5
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %14, ptr %9, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #5
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %15, ptr %10, align 8, !tbaa !5
  br label %16

16:                                               ; preds = %50, %12
  %17 = load ptr, ptr %9, align 8, !tbaa !5
  %18 = icmp ne ptr %17, null
  br i1 %18, label %19, label %22

19:                                               ; preds = %16
  %20 = load ptr, ptr %10, align 8, !tbaa !5
  %21 = icmp ne ptr %20, null
  br label %22

22:                                               ; preds = %19, %16
  %23 = phi i1 [ false, %16 ], [ %21, %19 ]
  br i1 %23, label %24, label %54

24:                                               ; preds = %22
  %25 = load ptr, ptr %9, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.Node, ptr %25, i32 0, i32 0
  %27 = load i32, ptr %26, align 8, !tbaa !9
  %28 = load ptr, ptr %10, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.Node, ptr %28, i32 0, i32 0
  %30 = load i32, ptr %29, align 8, !tbaa !9
  %31 = icmp sgt i32 %27, %30
  br i1 %31, label %32, label %43

32:                                               ; preds = %24
  %33 = load ptr, ptr %10, align 8, !tbaa !5
  %34 = load ptr, ptr %8, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.Node, ptr %34, i32 0, i32 1
  store ptr %33, ptr %35, align 8, !tbaa !12
  %36 = load ptr, ptr %10, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.Node, ptr %36, i32 0, i32 1
  %38 = load ptr, ptr %37, align 8, !tbaa !12
  store ptr %38, ptr %10, align 8, !tbaa !5
  br label %50

39:                                               ; preds = %2
  %40 = landingpad { ptr, i32 }
          cleanup
  %41 = extractvalue { ptr, i32 } %40, 0
  store ptr %41, ptr %6, align 8
  %42 = extractvalue { ptr, i32 } %40, 1
  store i32 %42, ptr %7, align 4
  call void @_ZdlPvm(ptr noundef %11, i64 noundef 16) #7
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  br label %72

43:                                               ; preds = %24
  %44 = load ptr, ptr %9, align 8, !tbaa !5
  %45 = load ptr, ptr %8, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.Node, ptr %45, i32 0, i32 1
  store ptr %44, ptr %46, align 8, !tbaa !12
  %47 = load ptr, ptr %9, align 8, !tbaa !5
  %48 = getelementptr inbounds %struct.Node, ptr %47, i32 0, i32 1
  %49 = load ptr, ptr %48, align 8, !tbaa !12
  store ptr %49, ptr %9, align 8, !tbaa !5
  br label %50

50:                                               ; preds = %43, %32
  %51 = load ptr, ptr %8, align 8, !tbaa !5
  %52 = getelementptr inbounds %struct.Node, ptr %51, i32 0, i32 1
  %53 = load ptr, ptr %52, align 8, !tbaa !12
  store ptr %53, ptr %8, align 8, !tbaa !5
  br label %16, !llvm.loop !13

54:                                               ; preds = %22
  %55 = load ptr, ptr %9, align 8, !tbaa !5
  %56 = icmp ne ptr %55, null
  br i1 %56, label %57, label %61

57:                                               ; preds = %54
  %58 = load ptr, ptr %9, align 8, !tbaa !5
  %59 = load ptr, ptr %8, align 8, !tbaa !5
  %60 = getelementptr inbounds %struct.Node, ptr %59, i32 0, i32 1
  store ptr %58, ptr %60, align 8, !tbaa !12
  br label %61

61:                                               ; preds = %57, %54
  %62 = load ptr, ptr %10, align 8, !tbaa !5
  %63 = icmp ne ptr %62, null
  br i1 %63, label %64, label %68

64:                                               ; preds = %61
  %65 = load ptr, ptr %10, align 8, !tbaa !5
  %66 = load ptr, ptr %8, align 8, !tbaa !5
  %67 = getelementptr inbounds %struct.Node, ptr %66, i32 0, i32 1
  store ptr %65, ptr %67, align 8, !tbaa !12
  br label %68

68:                                               ; preds = %64, %61
  %69 = load ptr, ptr %5, align 8, !tbaa !5
  %70 = getelementptr inbounds %struct.Node, ptr %69, i32 0, i32 1
  %71 = load ptr, ptr %70, align 8, !tbaa !12
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  ret ptr %71

72:                                               ; preds = %39
  %73 = load ptr, ptr %6, align 8
  %74 = load i32, ptr %7, align 4
  %75 = insertvalue { ptr, i32 } poison, ptr %73, 0
  %76 = insertvalue { ptr, i32 } %75, i32 %74, 1
  resume { ptr, i32 } %76
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nobuiltin allocsize(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 = { 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 #3 = { nobuiltin nounwind "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 #4 = { 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 #5 = { nounwind }
attributes #6 = { builtin allocsize(0) }
attributes #7 = { builtin 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, !11, i64 0}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"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: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) unnamed_addr #1 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_Z11sortedMergeP4NodeS0_(ptr noundef %0, ptr noundef %1) local_unnamed_addr #2 personality ptr @__gxx_personality_v0 {
  %3 = tail call noalias noundef nonnull dereferenceable(16) ptr @_Znwm(i64 noundef 16) #3
  tail call void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %3, i32 noundef 0)
  %4 = icmp ne ptr %0, null
  %5 = icmp ne ptr %1, null
  %6 = and i1 %4, %5
  br i1 %6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %17
  %.027 = phi ptr [ %.1, %17 ], [ %1, %2 ]
  %.02126 = phi ptr [ %.122, %17 ], [ %0, %2 ]
  %.02325 = phi ptr [ %18, %17 ], [ %3, %2 ]
  %7 = load i32, ptr %.02126, align 8, !tbaa !5
  %8 = load i32, ptr %.027, align 8, !tbaa !5
  %9 = icmp sgt i32 %7, %8
  %10 = getelementptr inbounds i8, ptr %.02325, i64 8
  br i1 %9, label %11, label %14

11:                                               ; preds = %.lr.ph
  store ptr %.027, ptr %10, align 8, !tbaa !11
  %12 = getelementptr inbounds i8, ptr %.027, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !11
  br label %17

14:                                               ; preds = %.lr.ph
  store ptr %.02126, ptr %10, align 8, !tbaa !11
  %15 = getelementptr inbounds i8, ptr %.02126, i64 8
  %16 = load ptr, ptr %15, align 8, !tbaa !11
  br label %17

17:                                               ; preds = %14, %11
  %18 = phi ptr [ %.027, %11 ], [ %.02126, %14 ]
  %.122 = phi ptr [ %.02126, %11 ], [ %16, %14 ]
  %.1 = phi ptr [ %13, %11 ], [ %.027, %14 ]
  %19 = icmp ne ptr %.122, null
  %20 = icmp ne ptr %.1, null
  %21 = select i1 %19, i1 %20, i1 false
  br i1 %21, label %.lr.ph, label %._crit_edge, !llvm.loop !12

._crit_edge:                                      ; preds = %17, %2
  %.023.lcssa = phi ptr [ %3, %2 ], [ %18, %17 ]
  %.021.lcssa = phi ptr [ %0, %2 ], [ %.122, %17 ]
  %.0.lcssa = phi ptr [ %1, %2 ], [ %.1, %17 ]
  %.lcssa24 = phi i1 [ %4, %2 ], [ %19, %17 ]
  %.lcssa = phi i1 [ %5, %2 ], [ %20, %17 ]
  br i1 %.lcssa24, label %22, label %24

22:                                               ; preds = %._crit_edge
  %23 = getelementptr inbounds i8, ptr %.023.lcssa, i64 8
  store ptr %.021.lcssa, ptr %23, align 8, !tbaa !11
  br label %24

24:                                               ; preds = %22, %._crit_edge
  br i1 %.lcssa, label %25, label %27

25:                                               ; preds = %24
  %26 = getelementptr inbounds i8, ptr %.023.lcssa, i64 8
  store ptr %.0.lcssa, ptr %26, align 8, !tbaa !11
  br label %27

27:                                               ; preds = %25, %24
  %28 = getelementptr inbounds i8, ptr %3, i64 8
  %29 = load ptr, ptr %28, align 8, !tbaa !11
  ret ptr %29
}

attributes #0 = { nobuiltin allocsize(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 = { 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 = { 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 #3 = { builtin allocsize(0) }

!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, !7, i64 0}
!6 = !{!"_ZTS4Node", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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