; LLVM IR from smv1999/CompetitiveProgrammingQuestionBank :: Data Structures/Linked Lists/Singly Linked List/rotate_linkedlist.ll (Z6rotateP4Nodei)

; 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 }

; 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: mustprogress nounwind uwtable
define dso_local noundef ptr @_Z6rotateP4Nodei(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %7, ptr %5, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %13, %2
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.Node, ptr %9, i32 0, i32 1
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %12 = icmp ne ptr %11, null
  br i1 %12, label %13, label %17

13:                                               ; preds = %8
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.Node, ptr %14, i32 0, i32 1
  %16 = load ptr, ptr %15, align 8, !tbaa !11
  store ptr %16, ptr %5, align 8, !tbaa !5
  br label %8, !llvm.loop !13

17:                                               ; preds = %8
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.Node, ptr %19, i32 0, i32 1
  store ptr %18, ptr %20, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  br label %21

21:                                               ; preds = %25, %17
  %22 = load i32, ptr %4, align 4, !tbaa !9
  %23 = add nsw i32 %22, -1
  store i32 %23, ptr %4, align 4, !tbaa !9
  %24 = icmp ne i32 %22, 0
  br i1 %24, label %25, label %30

25:                                               ; preds = %21
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %26, ptr %6, align 8, !tbaa !5
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.Node, ptr %27, i32 0, i32 1
  %29 = load ptr, ptr %28, align 8, !tbaa !11
  store ptr %29, ptr %3, align 8, !tbaa !5
  br label %21, !llvm.loop !15

30:                                               ; preds = %21
  %31 = load ptr, ptr %6, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.Node, ptr %31, i32 0, i32 1
  store ptr null, ptr %32, align 8, !tbaa !11
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret ptr %33
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"_ZTS4Node", !10, i64 0, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}


; 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: mustprogress nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: write) uwtable
define dso_local noundef ptr @_Z6rotateP4Nodei(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  br label %3

3:                                                ; preds = %3, %2
  %.09 = phi ptr [ %0, %2 ], [ %5, %3 ]
  %4 = getelementptr inbounds i8, ptr %.09, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %.not = icmp eq ptr %5, null
  br i1 %.not, label %6, label %3, !llvm.loop !11

6:                                                ; preds = %3
  %7 = getelementptr inbounds i8, ptr %.09, i64 8
  store ptr %0, ptr %7, align 8, !tbaa !5
  %.not1314 = icmp ne i32 %1, 0
  tail call void @llvm.assume(i1 %.not1314)
  %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 = %6, %.lr.ph.prol
  %.01016.prol = phi i32 [ %8, %.lr.ph.prol ], [ %1, %6 ]
  %.01115.prol = phi ptr [ %10, %.lr.ph.prol ], [ %0, %6 ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %6 ]
  %8 = add nsw i32 %.01016.prol, -1
  %9 = getelementptr inbounds i8, ptr %.01115.prol, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  %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 !13

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %6
  %.01115.lcssa.unr = phi ptr [ poison, %6 ], [ %.01115.prol, %.lr.ph.prol ]
  %.lcssa.unr = phi ptr [ poison, %6 ], [ %10, %.lr.ph.prol ]
  %.01016.unr = phi i32 [ %1, %6 ], [ %8, %.lr.ph.prol ]
  %.01115.unr = phi ptr [ %0, %6 ], [ %10, %.lr.ph.prol ]
  %11 = icmp ult i32 %1, 8
  br i1 %11, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.01016 = phi i32 [ %26, %.lr.ph ], [ %.01016.unr, %.lr.ph.prol.loopexit ]
  %.01115 = phi ptr [ %28, %.lr.ph ], [ %.01115.unr, %.lr.ph.prol.loopexit ]
  %12 = getelementptr inbounds i8, ptr %.01115, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %13, i64 8
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %15, i64 8
  %17 = load ptr, ptr %16, align 8, !tbaa !5
  %18 = getelementptr inbounds i8, ptr %17, i64 8
  %19 = load ptr, ptr %18, align 8, !tbaa !5
  %20 = getelementptr inbounds i8, ptr %19, i64 8
  %21 = load ptr, ptr %20, align 8, !tbaa !5
  %22 = getelementptr inbounds i8, ptr %21, i64 8
  %23 = load ptr, ptr %22, align 8, !tbaa !5
  %24 = getelementptr inbounds i8, ptr %23, i64 8
  %25 = load ptr, ptr %24, align 8, !tbaa !5
  %26 = add nsw i32 %.01016, -8
  %27 = getelementptr inbounds i8, ptr %25, i64 8
  %28 = load ptr, ptr %27, align 8, !tbaa !5
  %.not13.7 = icmp eq i32 %26, 0
  br i1 %.not13.7, label %._crit_edge, label %.lr.ph, !llvm.loop !15

._crit_edge:                                      ; preds = %.lr.ph, %.lr.ph.prol.loopexit
  %.01115.lcssa = phi ptr [ %.01115.lcssa.unr, %.lr.ph.prol.loopexit ], [ %25, %.lr.ph ]
  %.lcssa = phi ptr [ %.lcssa.unr, %.lr.ph.prol.loopexit ], [ %28, %.lr.ph ]
  %29 = getelementptr inbounds i8, ptr %.01115.lcssa, i64 8
  store ptr null, ptr %29, align 8, !tbaa !5
  ret ptr %.lcssa
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write)
declare void @llvm.assume(i1 noundef) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: write) 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 #1 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write) }

!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 = !{!"_ZTS4Node", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.unroll.disable"}
!15 = distinct !{!15, !12}


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