; LLVM IR from KishanBGajera/2024-366-Days-Of-DSA :: Data Structures/Linear/Linked List/Doubly Linked List/C (main)

; 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.DoublyLinkedList = type { ptr, i32 }
%struct.Node = type { i32, ptr, ptr }

; 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 uwtable
define dso_local i32 @searchNode(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.DoublyLinkedList, ptr %9, i32 0, i32 0
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  store ptr %11, ptr %7, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %23, %2
  %13 = load ptr, ptr %7, align 8, !tbaa !5
  %14 = icmp ne ptr %13, null
  br i1 %14, label %15, label %21

15:                                               ; preds = %12
  %16 = load ptr, ptr %7, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.Node, ptr %16, i32 0, i32 0
  %18 = load i32, ptr %17, align 8, !tbaa !13
  %19 = load i32, ptr %5, align 4, !tbaa !9
  %20 = icmp ne i32 %18, %19
  br label %21

21:                                               ; preds = %15, %12
  %22 = phi i1 [ false, %12 ], [ %20, %15 ]
  br i1 %22, label %23, label %29

23:                                               ; preds = %21
  %24 = load ptr, ptr %7, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.Node, ptr %24, i32 0, i32 2
  %26 = load ptr, ptr %25, align 8, !tbaa !15
  store ptr %26, ptr %7, align 8, !tbaa !5
  %27 = load i32, ptr %6, align 4, !tbaa !9
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %6, align 4, !tbaa !9
  br label %12, !llvm.loop !16

29:                                               ; preds = %21
  %30 = load ptr, ptr %7, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.Node, ptr %30, i32 0, i32 0
  %32 = load i32, ptr %31, align 8, !tbaa !13
  %33 = load i32, ptr %5, align 4, !tbaa !9
  %34 = icmp eq i32 %32, %33
  br i1 %34, label %35, label %37

35:                                               ; preds = %29
  %36 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %36, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %38

37:                                               ; preds = %29
  store i32 -1, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %38

38:                                               ; preds = %37, %35
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %39 = load i32, ptr %3, align 4
  ret i32 %39
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 }

!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, !6, i64 0}
!12 = !{!"DoublyLinkedList", !6, i64 0, !10, i64 8}
!13 = !{!14, !10, i64 0}
!14 = !{!"Node", !10, i64 0, !6, i64 8, !6, i64 16}
!15 = !{!14, !6, i64 16}
!16 = distinct !{!16, !17}
!17 = !{!"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: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local i32 @searchNode(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %.020 = load ptr, ptr %0, align 8, !tbaa !5, !nonnull !9, !noundef !9
  %3 = load i32, ptr %.020, align 8, !tbaa !10
  %.not1121 = icmp eq i32 %3, %1
  br i1 %.not1121, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.023 = phi ptr [ %.0, %.lr.ph ], [ %.020, %2 ]
  %.091422 = phi i32 [ %5, %.lr.ph ], [ 0, %2 ]
  %4 = getelementptr inbounds i8, ptr %.023, i64 16
  %5 = add nuw nsw i32 %.091422, 1
  %.0 = load ptr, ptr %4, align 8, !tbaa !5, !nonnull !9, !noundef !9
  %6 = load i32, ptr %.0, align 8, !tbaa !10
  %.not11 = icmp eq i32 %6, %1
  br i1 %.not11, label %.critedge, label %.lr.ph

.critedge:                                        ; preds = %.lr.ph, %2
  %.0914.lcssa = phi i32 [ 0, %2 ], [ %5, %.lr.ph ]
  %.0.lcssa = phi ptr [ %.020, %2 ], [ %.0, %.lr.ph ]
  %7 = load i32, ptr %.0.lcssa, align 8, !tbaa !10
  %8 = icmp eq i32 %7, %1
  %.09. = select i1 %8, i32 %.0914.lcssa, i32 -1
  ret i32 %.09.
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) 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" }

!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, !12, i64 0}
!11 = !{!"Node", !12, i64 0, !6, i64 8, !6, i64 16}
!12 = !{!"int", !7, i64 0}


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