; LLVM IR from ahampriyanshu/algo-ds-101 :: Data-Structures/LinkedList/Singly_Linked_List (linked list)

; 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
@.str.3 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [21 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [30 x i8], align 1

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

declare i32 @printf(ptr noundef, ...) #1

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

; Function Attrs: nounwind uwtable
define dso_local void @create() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  store i32 1, ptr %3, align 4, !tbaa !5
  %5 = call i32 (ptr, ...) @printf(ptr noundef @.str.4)
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.3, ptr noundef %1)
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #4
  %7 = call noalias ptr @malloc(i64 noundef 16) #5
  store ptr %7, ptr %4, align 8, !tbaa !9
  %8 = load ptr, ptr %4, align 8, !tbaa !9
  store ptr %8, ptr @start, align 8, !tbaa !9
  %9 = call i32 (ptr, ...) @printf(ptr noundef @.str.5)
  %10 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.3, ptr noundef %2)
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = load ptr, ptr %4, align 8, !tbaa !9
  %13 = getelementptr inbounds %struct.node, ptr %12, i32 0, i32 0
  store i32 %11, ptr %13, align 8, !tbaa !11
  %14 = load ptr, ptr %4, align 8, !tbaa !9
  %15 = getelementptr inbounds %struct.node, ptr %14, i32 0, i32 1
  store ptr null, ptr %15, align 8, !tbaa !13
  store i32 2, ptr %3, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %34, %0
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = load i32, ptr %1, align 4, !tbaa !5
  %19 = icmp sle i32 %17, %18
  br i1 %19, label %20, label %37

20:                                               ; preds = %16
  %21 = call i32 (ptr, ...) @printf(ptr noundef @.str.5)
  %22 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.3, ptr noundef %2)
  %23 = call noalias ptr @malloc(i64 noundef 16) #5
  %24 = load ptr, ptr %4, align 8, !tbaa !9
  %25 = getelementptr inbounds %struct.node, ptr %24, i32 0, i32 1
  store ptr %23, ptr %25, align 8, !tbaa !13
  %26 = load ptr, ptr %4, align 8, !tbaa !9
  %27 = getelementptr inbounds %struct.node, ptr %26, i32 0, i32 1
  %28 = load ptr, ptr %27, align 8, !tbaa !13
  store ptr %28, ptr %4, align 8, !tbaa !9
  %29 = load i32, ptr %2, align 4, !tbaa !5
  %30 = load ptr, ptr %4, align 8, !tbaa !9
  %31 = getelementptr inbounds %struct.node, ptr %30, i32 0, i32 0
  store i32 %29, ptr %31, align 8, !tbaa !11
  %32 = load ptr, ptr %4, align 8, !tbaa !9
  %33 = getelementptr inbounds %struct.node, ptr %32, i32 0, i32 1
  store ptr null, ptr %33, align 8, !tbaa !13
  br label %34

34:                                               ; preds = %20
  %35 = load i32, ptr %3, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %3, align 4, !tbaa !5
  br label %16, !llvm.loop !14

37:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #4
  ret void
}

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #3

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

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { "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 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 #4 = { nounwind }
attributes #5 = { 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
@.str.3 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [21 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [30 x i8], align 1

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

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nofree nounwind uwtable
define dso_local void @create() local_unnamed_addr #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #4
  %3 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4)
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.3, ptr noundef nonnull %1)
  %5 = call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #5
  store ptr %5, ptr @start, align 8, !tbaa !5
  %6 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.5)
  %7 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.3, ptr noundef nonnull %2)
  %8 = load i32, ptr %2, align 4, !tbaa !9
  store i32 %8, ptr %5, align 8, !tbaa !11
  %9 = getelementptr inbounds i8, ptr %5, i64 8
  store ptr null, ptr %9, align 8, !tbaa !13
  %10 = load i32, ptr %1, align 4, !tbaa !9
  %.not9 = icmp slt i32 %10, 2
  br i1 %.not9, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.011 = phi ptr [ %13, %.lr.ph ], [ %5, %0 ]
  %.0810 = phi i32 [ %17, %.lr.ph ], [ 2, %0 ]
  %11 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.5)
  %12 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.3, ptr noundef nonnull %2)
  %13 = call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #5
  %14 = getelementptr inbounds i8, ptr %.011, i64 8
  store ptr %13, ptr %14, align 8, !tbaa !13
  %15 = load i32, ptr %2, align 4, !tbaa !9
  store i32 %15, ptr %13, align 8, !tbaa !11
  %16 = getelementptr inbounds i8, ptr %13, i64 8
  store ptr null, ptr %16, align 8, !tbaa !13
  %17 = add nuw nsw i32 %.0810, 1
  %18 = load i32, ptr %1, align 4, !tbaa !9
  %.not.not = icmp slt i32 %.0810, %18
  br i1 %.not.not, label %.lr.ph, label %._crit_edge, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph, %0
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #4
  ret void
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #3

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

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nofree 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 #2 = { 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 #3 = { 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 #4 = { nounwind }
attributes #5 = { 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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"node", !10, i64 0, !6, i64 8}
!13 = !{!12, !6, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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