; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 10. Linked List/c lang/CircularDoublyLinkedList (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
  %10 = call noalias ptr @malloc(i64 noundef 24) #4
  store ptr %10, ptr %7, align 8, !tbaa !9
  %11 = load ptr, ptr %7, align 8, !tbaa !9
  %12 = getelementptr inbounds %struct.node, ptr %11, i32 0, i32 1
  store ptr null, ptr %12, align 8, !tbaa !11
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = load ptr, ptr %7, align 8, !tbaa !9
  %15 = getelementptr inbounds %struct.node, ptr %14, i32 0, i32 0
  store i32 %13, ptr %15, align 8, !tbaa !13
  %16 = load ptr, ptr %7, align 8, !tbaa !9
  %17 = getelementptr inbounds %struct.node, ptr %16, i32 0, i32 2
  store ptr null, ptr %17, align 8, !tbaa !14
  br label %18

18:                                               ; preds = %41, %2
  %19 = load ptr, ptr %5, align 8, !tbaa !9
  %20 = getelementptr inbounds %struct.node, ptr %19, i32 0, i32 2
  %21 = load ptr, ptr %20, align 8, !tbaa !14
  %22 = load ptr, ptr @start, align 8, !tbaa !9
  %23 = icmp ne ptr %21, %22
  br i1 %23, label %24, label %48

24:                                               ; preds = %18
  %25 = load i32, ptr %8, align 4, !tbaa !5
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = icmp eq i32 %25, %26
  br i1 %27, label %28, label %41

28:                                               ; preds = %24
  %29 = load ptr, ptr %7, align 8, !tbaa !9
  %30 = load ptr, ptr %6, align 8, !tbaa !9
  %31 = getelementptr inbounds %struct.node, ptr %30, i32 0, i32 2
  store ptr %29, ptr %31, align 8, !tbaa !14
  %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 1
  store ptr %32, ptr %34, align 8, !tbaa !11
  %35 = load ptr, ptr %5, align 8, !tbaa !9
  %36 = load ptr, ptr %7, align 8, !tbaa !9
  %37 = getelementptr inbounds %struct.node, ptr %36, i32 0, i32 2
  store ptr %35, ptr %37, align 8, !tbaa !14
  %38 = load ptr, ptr %7, align 8, !tbaa !9
  %39 = load ptr, ptr %5, align 8, !tbaa !9
  %40 = getelementptr inbounds %struct.node, ptr %39, i32 0, i32 1
  store ptr %38, ptr %40, align 8, !tbaa !11
  br label %48

41:                                               ; preds = %24
  %42 = load ptr, ptr %5, align 8, !tbaa !9
  store ptr %42, ptr %6, align 8, !tbaa !9
  %43 = load ptr, ptr %5, align 8, !tbaa !9
  %44 = getelementptr inbounds %struct.node, ptr %43, i32 0, i32 2
  %45 = load ptr, ptr %44, align 8, !tbaa !14
  store ptr %45, ptr %5, align 8, !tbaa !9
  %46 = load i32, ptr %8, align 4, !tbaa !5
  %47 = add nsw i32 %46, 1
  store i32 %47, ptr %8, align 4, !tbaa !5
  br label %18, !llvm.loop !15

48:                                               ; preds = %28, %18
  %49 = load ptr, ptr %5, align 8, !tbaa !9
  %50 = getelementptr inbounds %struct.node, ptr %49, i32 0, i32 2
  %51 = load ptr, ptr %50, align 8, !tbaa !14
  %52 = load ptr, ptr @start, align 8, !tbaa !9
  %53 = icmp eq ptr %51, %52
  br i1 %53, label %58, label %54

54:                                               ; preds = %48
  %55 = load i32, ptr %8, align 4, !tbaa !5
  %56 = load i32, ptr %4, align 4, !tbaa !5
  %57 = icmp eq i32 %55, %56
  br i1 %57, label %58, label %71

58:                                               ; preds = %54, %48
  %59 = load ptr, ptr %7, align 8, !tbaa !9
  %60 = load ptr, ptr %6, align 8, !tbaa !9
  %61 = getelementptr inbounds %struct.node, ptr %60, i32 0, i32 2
  store ptr %59, ptr %61, align 8, !tbaa !14
  %62 = load ptr, ptr %6, align 8, !tbaa !9
  %63 = load ptr, ptr %7, align 8, !tbaa !9
  %64 = getelementptr inbounds %struct.node, ptr %63, i32 0, i32 1
  store ptr %62, ptr %64, align 8, !tbaa !11
  %65 = load ptr, ptr %5, align 8, !tbaa !9
  %66 = load ptr, ptr %7, align 8, !tbaa !9
  %67 = getelementptr inbounds %struct.node, ptr %66, i32 0, i32 2
  store ptr %65, ptr %67, align 8, !tbaa !14
  %68 = load ptr, ptr %7, align 8, !tbaa !9
  %69 = load ptr, ptr %5, align 8, !tbaa !9
  %70 = getelementptr inbounds %struct.node, ptr %69, i32 0, i32 1
  store ptr %68, ptr %70, align 8, !tbaa !11
  br label %71

71:                                               ; preds = %58, %54
  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 {
  %3 = load ptr, ptr @start, align 8, !tbaa !5
  %4 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #3
  %5 = getelementptr inbounds i8, ptr %4, i64 8
  store ptr null, ptr %5, align 8, !tbaa !9
  store i32 %0, ptr %4, align 8, !tbaa !12
  %6 = getelementptr inbounds i8, ptr %4, i64 16
  store ptr null, ptr %6, align 8, !tbaa !13
  %7 = getelementptr inbounds i8, ptr %3, i64 16
  %8 = load ptr, ptr %7, align 8, !tbaa !13
  %.not40 = icmp eq ptr %8, %3
  br i1 %.not40, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %9 = icmp ne i32 %1, 1
  tail call void @llvm.assume(i1 %9)
  br label %.lr.ph68

.lr.ph:                                           ; preds = %.lr.ph68
  %10 = icmp eq i32 %14, %1
  br i1 %10, label %.loopexit.thread, label %.lr.ph68, !llvm.loop !14

.loopexit.thread:                                 ; preds = %.lr.ph
  %11 = getelementptr inbounds i8, ptr %.0284267, i64 16
  store ptr %4, ptr %11, align 8, !tbaa !13
  %12 = getelementptr inbounds i8, ptr %13, i64 8
  store ptr %4, ptr %12, align 8, !tbaa !9
  br label %21

.lr.ph68:                                         ; preds = %.lr.ph.preheader, %.lr.ph
  %.0284267 = phi ptr [ %13, %.lr.ph ], [ %3, %.lr.ph.preheader ]
  %.04366 = phi i32 [ %14, %.lr.ph ], [ 1, %.lr.ph.preheader ]
  %13 = phi ptr [ %16, %.lr.ph ], [ %8, %.lr.ph.preheader ]
  %14 = add nuw nsw i32 %.04366, 1
  %15 = getelementptr inbounds i8, ptr %13, i64 16
  %16 = load ptr, ptr %15, align 8, !tbaa !13
  %.not = icmp eq ptr %16, %3
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !14

.loopexit:                                        ; preds = %.lr.ph68, %2
  %.02937 = phi ptr [ undef, %2 ], [ %.0284267, %.lr.ph68 ]
  %.02835 = phi ptr [ %3, %2 ], [ %13, %.lr.ph68 ]
  %.033 = phi i32 [ 1, %2 ], [ %14, %.lr.ph68 ]
  %17 = getelementptr inbounds i8, ptr %.02835, i64 16
  %18 = load ptr, ptr %17, align 8, !tbaa !13
  %19 = icmp eq ptr %18, %3
  %20 = icmp eq i32 %.033, %1
  %or.cond = select i1 %19, i1 true, i1 %20
  br i1 %or.cond, label %21, label %24

21:                                               ; preds = %.loopexit.thread, %.loopexit
  %.0283557 = phi ptr [ %13, %.loopexit.thread ], [ %.02835, %.loopexit ]
  %.0293756 = phi ptr [ %.0284267, %.loopexit.thread ], [ %.02937, %.loopexit ]
  %22 = getelementptr inbounds i8, ptr %.0293756, i64 16
  store ptr %4, ptr %22, align 8, !tbaa !13
  store ptr %.0293756, ptr %5, align 8, !tbaa !9
  store ptr %.0283557, ptr %6, align 8, !tbaa !13
  %23 = getelementptr inbounds i8, ptr %.0283557, i64 8
  store ptr %4, ptr %23, align 8, !tbaa !9
  br label %24

24:                                               ; preds = %.loopexit, %21
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write)
declare void @llvm.assume(i1 noundef) #2

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 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write) }
attributes #3 = { 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 = !{!10, !6, i64 8}
!10 = !{!"node", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 0}
!13 = !{!10, !6, i64 16}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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