; LLVM IR from ImChong/Practice_LeetCode_C :: F01_Common_Functions/src (common_linked_list_dummy)

; 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.DummyLinkedList = type { ptr, i32 }
%struct.ListNode = type { i32, 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 @DLinkedList_GetValueAtIndex(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %7 = load i32, ptr %5, align 4, !tbaa !9
  %8 = icmp slt i32 %7, 0
  br i1 %8, label %15, label %9

9:                                                ; preds = %2
  %10 = load i32, ptr %5, align 4, !tbaa !9
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.DummyLinkedList, ptr %11, i32 0, i32 1
  %13 = load i32, ptr %12, align 8, !tbaa !11
  %14 = icmp sge i32 %10, %13
  br i1 %14, label %15, label %16

15:                                               ; preds = %9, %2
  store i32 -1, ptr %3, align 4
  br label %32

16:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.DummyLinkedList, ptr %17, i32 0, i32 0
  %19 = load ptr, ptr %18, align 8, !tbaa !13
  store ptr %19, ptr %6, align 8, !tbaa !5
  br label %20

20:                                               ; preds = %24, %16
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = add nsw i32 %21, -1
  store i32 %22, ptr %5, align 4, !tbaa !9
  %23 = icmp sgt i32 %21, 0
  br i1 %23, label %24, label %28

24:                                               ; preds = %20
  %25 = load ptr, ptr %6, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.ListNode, ptr %25, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !14
  store ptr %27, ptr %6, align 8, !tbaa !5
  br label %20, !llvm.loop !16

28:                                               ; preds = %20
  %29 = load ptr, ptr %6, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.ListNode, ptr %29, i32 0, i32 0
  %31 = load i32, ptr %30, align 8, !tbaa !18
  store i32 %31, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %32

32:                                               ; preds = %28, %15
  %33 = load i32, ptr %3, align 4
  ret i32 %33
}

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, !10, i64 8}
!12 = !{!"", !6, i64 0, !10, i64 8}
!13 = !{!12, !6, i64 0}
!14 = !{!15, !6, i64 8}
!15 = !{!"ListNode", !10, i64 0, !6, i64 8}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}
!18 = !{!15, !10, i64 0}


; 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 @DLinkedList_GetValueAtIndex(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %1, 0
  br i1 %3, label %22, label %4

4:                                                ; preds = %2
  %5 = getelementptr inbounds i8, ptr %0, i64 8
  %6 = load i32, ptr %5, align 8, !tbaa !5
  %.not = icmp sgt i32 %6, %1
  br i1 %.not, label %.preheader, label %22

.preheader:                                       ; preds = %4
  %.010 = load ptr, ptr %0, align 8, !tbaa !11
  %.not13 = icmp eq i32 %1, 0
  br i1 %.not13, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %.preheader
  %xtraiter = and i32 %1, 7
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader, %.lr.ph.prol
  %.012.prol = phi ptr [ %.0.prol, %.lr.ph.prol ], [ %.010, %.lr.ph.preheader ]
  %.0711.prol = phi i32 [ %7, %.lr.ph.prol ], [ %1, %.lr.ph.preheader ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader ]
  %7 = add nsw i32 %.0711.prol, -1
  %8 = getelementptr inbounds i8, ptr %.012.prol, i64 8
  %.0.prol = load ptr, ptr %8, align 8, !tbaa !11
  %prol.iter.next = add i32 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i32 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !12

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader
  %.012.unr = phi ptr [ %.010, %.lr.ph.preheader ], [ %.0.prol, %.lr.ph.prol ]
  %.0711.unr = phi i32 [ %1, %.lr.ph.preheader ], [ %7, %.lr.ph.prol ]
  %.0.lcssa17.unr = phi ptr [ poison, %.lr.ph.preheader ], [ %.0.prol, %.lr.ph.prol ]
  %9 = icmp ult i32 %1, 8
  br i1 %9, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.012 = phi ptr [ %.0.7, %.lr.ph ], [ %.012.unr, %.lr.ph.prol.loopexit ]
  %.0711 = phi i32 [ %17, %.lr.ph ], [ %.0711.unr, %.lr.ph.prol.loopexit ]
  %10 = getelementptr inbounds i8, ptr %.012, i64 8
  %.0 = load ptr, ptr %10, align 8, !tbaa !11
  %11 = getelementptr inbounds i8, ptr %.0, i64 8
  %.0.1 = load ptr, ptr %11, align 8, !tbaa !11
  %12 = getelementptr inbounds i8, ptr %.0.1, i64 8
  %.0.2 = load ptr, ptr %12, align 8, !tbaa !11
  %13 = getelementptr inbounds i8, ptr %.0.2, i64 8
  %.0.3 = load ptr, ptr %13, align 8, !tbaa !11
  %14 = getelementptr inbounds i8, ptr %.0.3, i64 8
  %.0.4 = load ptr, ptr %14, align 8, !tbaa !11
  %15 = getelementptr inbounds i8, ptr %.0.4, i64 8
  %.0.5 = load ptr, ptr %15, align 8, !tbaa !11
  %16 = getelementptr inbounds i8, ptr %.0.5, i64 8
  %.0.6 = load ptr, ptr %16, align 8, !tbaa !11
  %17 = add nsw i32 %.0711, -8
  %18 = getelementptr inbounds i8, ptr %.0.6, i64 8
  %.0.7 = load ptr, ptr %18, align 8, !tbaa !11
  %19 = add i32 %.0711, -9
  %20 = icmp ult i32 %19, -2
  br i1 %20, label %.lr.ph, label %._crit_edge, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %.preheader
  %.0.lcssa = phi ptr [ %.010, %.preheader ], [ %.0.lcssa17.unr, %.lr.ph.prol.loopexit ], [ %.0.7, %.lr.ph ]
  %21 = load i32, ptr %.0.lcssa, align 8, !tbaa !16
  br label %22

22:                                               ; preds = %2, %4, %._crit_edge
  %.08 = phi i32 [ %21, %._crit_edge ], [ -1, %4 ], [ -1, %2 ]
  ret i32 %.08
}

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, !10, i64 8}
!6 = !{!"", !7, i64 0, !10, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.unroll.disable"}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!17, !10, i64 0}
!17 = !{!"ListNode", !10, i64 0, !7, i64 8}


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