; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 10. Linked List/c lang/SinglyLinkedList (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 }

@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 i32, align 4
  %7 = alloca ptr, align 8
  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
  %8 = load ptr, ptr @start, align 8, !tbaa !9
  store ptr %8, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 1, ptr %6, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %31, %2
  %10 = load ptr, ptr %5, align 8, !tbaa !9
  %11 = icmp ne ptr %10, null
  br i1 %11, label %12, label %35

12:                                               ; preds = %9
  %13 = load i32, ptr %6, align 4, !tbaa !5
  %14 = add nsw i32 %13, 1
  store i32 %14, ptr %6, align 4, !tbaa !5
  %15 = load i32, ptr %6, align 4, !tbaa !5
  %16 = load i32, ptr %4, align 4, !tbaa !5
  %17 = icmp eq i32 %15, %16
  br i1 %17, label %18, label %31

18:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %19 = call noalias ptr @malloc(i64 noundef 16) #4
  store ptr %19, ptr %7, align 8, !tbaa !9
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = load ptr, ptr %7, align 8, !tbaa !9
  %22 = getelementptr inbounds %struct.node, ptr %21, i32 0, i32 0
  store i32 %20, ptr %22, align 8, !tbaa !11
  %23 = load ptr, ptr %5, align 8, !tbaa !9
  %24 = getelementptr inbounds %struct.node, ptr %23, i32 0, i32 1
  %25 = load ptr, ptr %24, align 8, !tbaa !13
  %26 = load ptr, ptr %7, align 8, !tbaa !9
  %27 = getelementptr inbounds %struct.node, ptr %26, i32 0, i32 1
  store ptr %25, ptr %27, align 8, !tbaa !13
  %28 = load ptr, ptr %7, align 8, !tbaa !9
  %29 = load ptr, ptr %5, align 8, !tbaa !9
  %30 = getelementptr inbounds %struct.node, ptr %29, i32 0, i32 1
  store ptr %28, ptr %30, align 8, !tbaa !13
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  br label %31

31:                                               ; preds = %18, %12
  %32 = load ptr, ptr %5, align 8, !tbaa !9
  %33 = getelementptr inbounds %struct.node, ptr %32, i32 0, i32 1
  %34 = load ptr, ptr %33, align 8, !tbaa !13
  store ptr %34, ptr %5, align 8, !tbaa !9
  br label %9, !llvm.loop !14

35:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, 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, !6, i64 0}
!12 = !{!"node", !6, i64 0, !10, i64 8}
!13 = !{!12, !10, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"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 {
  %.011 = load ptr, ptr @start, align 8, !tbaa !5
  %.not12 = icmp eq ptr %.011, null
  br i1 %.not12, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %10
  %.014 = phi ptr [ %.0, %10 ], [ %.011, %2 ]
  %.01013 = phi i32 [ %3, %10 ], [ 1, %2 ]
  %3 = add nuw nsw i32 %.01013, 1
  %4 = icmp eq i32 %3, %1
  br i1 %4, label %5, label %.lr.ph._crit_edge

.lr.ph._crit_edge:                                ; preds = %.lr.ph
  %.phi.trans.insert = getelementptr inbounds i8, ptr %.014, i64 8
  %.0.pre = load ptr, ptr %.phi.trans.insert, align 8, !tbaa !5
  br label %10

5:                                                ; preds = %.lr.ph
  %6 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #2
  store i32 %0, ptr %6, align 8, !tbaa !9
  %7 = getelementptr inbounds i8, ptr %.014, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !12
  %9 = getelementptr inbounds i8, ptr %6, i64 8
  store ptr %8, ptr %9, align 8, !tbaa !12
  store ptr %6, ptr %7, align 8, !tbaa !12
  br label %10

10:                                               ; preds = %.lr.ph._crit_edge, %5
  %.0 = phi ptr [ %.0.pre, %.lr.ph._crit_edge ], [ %6, %5 ]
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %10, %2
  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 = !{!10, !11, i64 0}
!10 = !{!"node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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