; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 10. Linked List/c lang/DoublyLinkedList (Inserting)

; 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, ptr }

@start = external dso_local global ptr, align 8

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

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @insertPos(i32 noundef %0, i32 noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %9 = load ptr, ptr @start, align 8, !tbaa !9
  store ptr %9, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 1, ptr %8, align 4, !tbaa !5
  br label %10

10:                                               ; preds = %38, %2
  %11 = load ptr, ptr %5, align 8, !tbaa !9
  %12 = icmp ne ptr %11, null
  br i1 %12, label %13, label %45

13:                                               ; preds = %10
  %14 = load i32, ptr %8, align 4, !tbaa !5
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = icmp eq i32 %14, %15
  br i1 %16, label %17, label %38

17:                                               ; preds = %13
  %18 = call noalias ptr @malloc(i64 noundef 24) #4
  store ptr %18, ptr %6, align 8, !tbaa !9
  %19 = load ptr, ptr %6, align 8, !tbaa !9
  %20 = getelementptr inbounds %struct.node, ptr %19, i32 0, i32 1
  store ptr null, ptr %20, align 8, !tbaa !11
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = load ptr, ptr %6, align 8, !tbaa !9
  %23 = getelementptr inbounds %struct.node, ptr %22, i32 0, i32 0
  store i32 %21, ptr %23, align 8, !tbaa !13
  %24 = load ptr, ptr %6, align 8, !tbaa !9
  %25 = getelementptr inbounds %struct.node, ptr %24, i32 0, i32 2
  store ptr null, ptr %25, align 8, !tbaa !14
  %26 = load ptr, ptr %5, align 8, !tbaa !9
  %27 = load ptr, ptr %6, align 8, !tbaa !9
  %28 = getelementptr inbounds %struct.node, ptr %27, i32 0, i32 2
  store ptr %26, ptr %28, align 8, !tbaa !14
  %29 = load ptr, ptr %6, align 8, !tbaa !9
  %30 = load ptr, ptr %5, align 8, !tbaa !9
  %31 = getelementptr inbounds %struct.node, ptr %30, i32 0, i32 1
  store ptr %29, ptr %31, align 8, !tbaa !11
  %32 = load ptr, ptr %6, align 8, !tbaa !9
  %33 = load ptr, ptr %7, align 8, !tbaa !9
  %34 = getelementptr inbounds %struct.node, ptr %33, i32 0, i32 2
  store ptr %32, ptr %34, align 8, !tbaa !14
  %35 = load ptr, ptr %7, align 8, !tbaa !9
  %36 = load ptr, ptr %6, align 8, !tbaa !9
  %37 = getelementptr inbounds %struct.node, ptr %36, i32 0, i32 1
  store ptr %35, ptr %37, align 8, !tbaa !11
  br label %45

38:                                               ; preds = %13
  %39 = load ptr, ptr %5, align 8, !tbaa !9
  store ptr %39, ptr %7, align 8, !tbaa !9
  %40 = load ptr, ptr %5, align 8, !tbaa !9
  %41 = getelementptr inbounds %struct.node, ptr %40, i32 0, i32 2
  %42 = load ptr, ptr %41, align 8, !tbaa !14
  store ptr %42, ptr %5, align 8, !tbaa !9
  %43 = load i32, ptr %8, align 4, !tbaa !5
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %8, align 4, !tbaa !5
  br label %10, !llvm.loop !15

45:                                               ; preds = %17, %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind 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 = { 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 = { nounwind }
attributes #4 = { nounwind 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, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !10, i64 8}
!12 = !{!"node", !6, i64 0, !10, i64 8, !10, i64 16}
!13 = !{!12, !6, i64 0}
!14 = !{!12, !10, i64 16}
!15 = distinct !{!15, !16}
!16 = !{!"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"

@start = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind uwtable
define dso_local void @insertPos(i32 noundef %0, i32 noundef %1) local_unnamed_addr #1 {
  %.01821 = load ptr, ptr @start, align 8, !tbaa !5
  %.not22 = icmp eq ptr %.01821, null
  br i1 %.not22, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %3 = icmp eq i32 %1, 1
  br i1 %3, label %.lr.ph._crit_edge, label %.lr.ph34

.lr.ph:                                           ; preds = %.lr.ph34
  %4 = add nuw nsw i32 %.02433, 1
  %5 = icmp eq i32 %4, %1
  br i1 %5, label %.lr.ph._crit_edge, label %.lr.ph34, !llvm.loop !9

.lr.ph._crit_edge:                                ; preds = %.lr.ph, %.lr.ph.preheader
  %.01825.lcssa = phi ptr [ %.01821, %.lr.ph.preheader ], [ %.018, %.lr.ph ]
  %.01723.lcssa = phi ptr [ undef, %.lr.ph.preheader ], [ %.0182532, %.lr.ph ]
  %6 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #2
  %7 = getelementptr inbounds i8, ptr %6, i64 8
  store i32 %0, ptr %6, align 8, !tbaa !11
  %8 = getelementptr inbounds i8, ptr %6, i64 16
  store ptr %.01825.lcssa, ptr %8, align 8, !tbaa !14
  %9 = getelementptr inbounds i8, ptr %.01825.lcssa, i64 8
  store ptr %6, ptr %9, align 8, !tbaa !15
  %10 = getelementptr inbounds i8, ptr %.01723.lcssa, i64 16
  store ptr %6, ptr %10, align 8, !tbaa !14
  store ptr %.01723.lcssa, ptr %7, align 8, !tbaa !15
  br label %.loopexit

.lr.ph34:                                         ; preds = %.lr.ph.preheader, %.lr.ph
  %.02433 = phi i32 [ %4, %.lr.ph ], [ 1, %.lr.ph.preheader ]
  %.0182532 = phi ptr [ %.018, %.lr.ph ], [ %.01821, %.lr.ph.preheader ]
  %11 = getelementptr inbounds i8, ptr %.0182532, i64 16
  %.018 = load ptr, ptr %11, align 8, !tbaa !5
  %.not = icmp eq ptr %.018, null
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !9

.loopexit:                                        ; preds = %.lr.ph34, %2, %.lr.ph._crit_edge
  ret void
}

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nofree 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 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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !13, i64 0}
!12 = !{!"node", !13, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!"int", !7, i64 0}
!14 = !{!12, !6, i64 16}
!15 = !{!12, !6, i64 8}


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